To see the other types of publications on this topic, follow the link: Soil behaviour.
Journal articles on the topic 'Soil behaviour'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Soil behaviour.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Jannuzzi, Graziella M. F., Fernando A. B. Danziger, and Ian S. M. Martins. "Surprising Soil Behaviour in Soil Sampling." Soils and Rocks 36, no. 3 (September 1, 2013): 265–74. http://dx.doi.org/10.28927/sr.363265.
Full textAbstract:
Thick wall (6.6 mm wall thickness) plastic samplers, 97.2 mm in internal diameter (area ratio of 29%), 700 mm in length (length of soil sample 640 mm), with a cutting edge angle of 23°, without clearance and with a sampler head have been used to collect very soft clay samples at Sarapuí II test site. Very good to excellent and good to fair quality samples have been surprisingly obtained in most cases, which were attributed to a combination of five factors: the absence of an inside clearance, the low friction of the plastic sampler, the small “trick” to close the top of the sampling rods assuring that suction would be imposed on the top of the sample, the very careful handling and trimming process, combined with no extrusion of the sample, and the small ratio between specimen diameter and sample diameter. It is still too early to propose the use of thick wall plastic samplers - in combination with the procedures outlined above - to be used in regular undisturbed soft clay sampling, and more research is needed to identify the role of each procedure in the final result. However, if confirmed, the procedures adopted will allow significant cost saving with respect to the use of thin wall brass (or stainless steel) samplers.
2
Fannin, R. J., Y. P. Vaid, and Y. C. Shi. "Filtration behaviour of nonwoven geotextiles." Canadian Geotechnical Journal 31, no. 4 (August 1, 1994): 555–63. http://dx.doi.org/10.1139/t94-064.
Full textAbstract:
Criteria for soil retention and permeability are important in the proper selection of a geotextile in filtration design. Gradient-ratio tests have been performed to assess the compatibility of nonwoven geotextiles with soils exhibiting a range of gradations. Observations of any soil piping through a geotextile were used to evaluate soil-retention criteria. The American Society for Testing and Materials test apparatus includes additional ports that were used to define a modified gradient ratio, which is a better indicator of flow condition. Measurements of the distribution of water head through the soil sample and geotextile specimen, and its variation with imposed hydraulic gradient and time, are used to establish the permeability of the soil and soil–geotextile composite. The composite layer is relatively thin. A unified interpretation of the results is presented that shows a gradient ratio greater than one means the permeability of the composite is less than that of the protected soil: the condition is acceptable if it can be demonstrated that no impediment of seepage flow will result. Key words : filtration, geotextile, soil retention, gradient ratio, permeability.
3
Oztoprak, Sadik, and S. Feyza Cinicioglu. "Soil behaviour through field instrumentation." Canadian Geotechnical Journal 42, no. 2 (April 1, 2005): 475–90. http://dx.doi.org/10.1139/t04-121.
Full textAbstract:
An improved version of the observational method is developed and proposed. The method uses field measurements as the direct inputs to the framework of the constitutive behaviour and analyses the behaviour synchronously as measurements are recorded. The method is developed for the specific case of embankments on soft clays, and its effectiveness is tested on a well-documented case history. The framework provided for the application of the method is basically the idealized stress space of the critical state theory, but the constitutive anisotropic elastoplastic soil model is added to this framework to analyse the behaviour and provide direct links between measurements and design parameters. Strain-rate dependency of the soft soils is also incorporated in the interpretation of the behaviour. To consider the variation in the behaviour of foundation soils, a zonation system is applied. Stress axis rotation is considered for active and passive regions effectively. Substantial savings can be achieved using the method in terms of time and cost, and the method is reliable. In addition, such an application improves the understanding of the real behaviour of soils.Key words: soft clays, embankment, observational method, rate effect, anisotropy, soil structure.
4
Ismail, Fauzilah, Mazidah Mukri, and Zainab Mohamed. "Assessment of Soil Dispersibility Behaviour In-Relation to Soil Internal Erosion Resistance." Scientific Research Journal 5, no. 1 (June 30, 2008): 39. http://dx.doi.org/10.24191/srj.v5i1.5652.
Full textAbstract:
A study was conducted to assess soil dispersibility behaviour in-relation to soil internal erosion resistance. Dispersive soils can be a problem for many geotechnical projects and structures. Water flowing in a crack of earth dam or infiltration of rainwater through the crack of slope surface with enough erosion energy can detach the soil particles into suspension and transport it along the movement that will lead to internal erosion process. Soil samples from sloping area within UiTM Shah Alam Campus were collected and a laboratory study was carried out to assess the soil dispersibility behaviour. A laboratory pinhole test and crumb test were conducted to identify soils which are easily dispersed hence susceptible to internal erosion. Indication of the removal of soil particles during testing is a factor in assessing the possibility of internal erosion. Fine-grained soils are known to have low resistance to erosion however laboratory result shows that soils fraction with high coarse-grained percentage has high dispersibility grade that lead to lower internal soil erosion resistance whereas the high moisture content percentage would enhance the dispersibility characteristic of the soils performance.
5
Peng, X., Z. B. Zhang, L. L. Wang, and L. Gan. "Does soil compaction change soil shrinkage behaviour?" Soil and Tillage Research 125 (September 2012): 89–95. http://dx.doi.org/10.1016/j.still.2012.04.001.
Full text
6
Khawmee, K., A. Suddhiprakarn, I. Kheoruenromne, I. Bibi, and B. Singh. "Dissolution behaviour of soil kaolinites in acidic solutions." Clay Minerals 48, no. 3 (June 2013): 447–61. http://dx.doi.org/10.1180/claymin.2013.048.3.02.
Full textAbstract:
AbstractHighly weathered soils of the tropics and subtropics commonly have kaolinitedominated clay fractions. Under acidic conditions prevailing in these soils kaolinite dissolution occurs, contributing to the high levels of soluble Al in these soils. This study evaluates the dissolution behaviour of kaolinites from subsurface horizons of highly weathered soils from Thailand, along with a soil kaolinite from Western Australia (WA kaolinite) and Georgia kaolinite (KGa-2). Kaolinite-dominated clay fractions were isolated from soils by sedimentation and chemically treated to remove iron oxides. The dissolution rate of kaolinites was measured in 0.01 M NaCl as a function of pH (1–4; HCl) at 25±1°C using non-stirred flow-through reactors. Kaolinite dissolution rates were calculated from the release of Al and Si at the steady state. In most of the experiments and at all pH values, the release of both Si and Al underwent a distinct transition from an initial period of rapid release to significantly slower release at the steady state. Aluminium and Si concentrations at the steady state were higher for soil kaolinites than the reference sample (KGa-2). At the steady state the dissolution of all kaolinites was stoichiometric except for the soil kaolinites from Thailand at pH 4, where the Al/Si ratio was well below the stoichiometric ratio. Log dissolution rate (RSi) of soil kaolinites ranged from –13.75 to –12.51, with the dissolution rate increasing significantly with decreasing solution pH. However, the dissolution rate was similar or pH independent between pH 2 and 3, which is the pH range of the point of zero net charge (PZNC) for both soil and reference kaolinites. The dissolution rate of soil kaolinite was significantly higher than the KGa-2 sample at pH < 3. The results obtained on kaolinite samples from highly weathered soils show that in highly acidic systems kaolinite is a source of soluble Al. Soil kaolinites with poorly ordered small crystals dissolve faster than better crystalline reference kaolinite (KGa-2) with larger crystals.
7
Todisco, Maria Cristina, and Matthew Richard Coop. "Quantifying “transitional” soil behaviour." Soils and Foundations 59, no. 6 (December 2019): 2070–82. http://dx.doi.org/10.1016/j.sandf.2019.11.014.
Full text
8
Jefferson, Ian, and Ian Smalley. "Fundamentals of Soil Behaviour." Geoderma 63, no. 3-4 (November 1994): 310–12. http://dx.doi.org/10.1016/0016-7061(94)90074-4.
Full text
9
Yang, Liming, Junhui Luo, Weiyun Chen, and Yumin Mou. "Amplification of Seismic Response in Poroviscoelastic Soil Layer." Advances in Civil Engineering 2020 (July 11, 2020): 1–12. http://dx.doi.org/10.1155/2020/8824445.
Full textAbstract:
The time-dependent behaviour of saturated soils under static and dynamic loading is generally attributed to the flow-dependent and viscous behaviour of pore fluid. However, the intrinsic energy dissipative effects from the flow-independent viscoelastic behaviour of solid skeleton are not always considered. In this study, the effect of flow-independent viscoelastic behaviour on the seismic amplification of ground soil in vertical and horizontal directions is studied based on a two-phase poroviscoelastic model. A generalized Kelvin–Voigt model is used to define the effective stress in the soils, and the compressibilities of both solid skeleton and pore fluid are considered. The seismic-induced dynamic displacements are analytically derived and are shown to depend on soil layer thickness, soil properties, and ground motion parameters. The formulation neglecting the viscoelastic behaviour of solid skeleton could overestimate both the vertical and horizontal motion amplifications at the surface of ground soil. In addition, the seismic responses of viscoelastic soils are demonstrated to be closely related to the saturation state of surface soil.
10
Dr. Ch Bhavannarayana,, Kuppili Harish. "Attentive Study on Strength Characteristics of Expansive Soils on Subgrade of Express Highways by utilisation of RBI Grade-81 and Local Polymers." International Journal for Modern Trends in Science and Technology, no. 8 (August 7, 2020): 104–11. http://dx.doi.org/10.46501/ijmtst060819.
Full textAbstract:
Chemical stabilization is one of the oldest methods of stabilization of problematic soil. In recent days, it has been investigated that addition of fibers will improve the ductility behavior of the soil there by reducing the development of crack during shrinkage. Extensive study has been carried out on the stabilization of expansive soils using various additives such as RBI, cement, flyash, industrial waste products etc., and also with random inclusion of fibers such as coir, sisal, polyester fibers etc. Randomly oriented tensile inclusions incorporated into soil to improve its load–deformation behaviour by interacting with the soil particles mechanically through surface friction and Effect of Random Inclusion of Coir Fibers on Strength Behaviour of RBI Treated Black Cotton Soil. This project describes the strength behavior of treated black cotton soil (BC soil) reinforced with local fiber. The various percentage of RBI Grade-81 as 2%, 4%, 6% and 8% was used to find out the optimum value of RBI Grade. local polymer has been randomly included into the RBI Grade treated soil at four different percentages of local fiber content, i.e. 0.5%, 1% 1.5%, and 2% (by weight of soil).
11
Maghsoodi, Soheib, Olivier Cuisinier, and Farimah Masrouri. "Thermo-mechanical behaviour of clay-structure interface." E3S Web of Conferences 92 (2019): 10002. http://dx.doi.org/10.1051/e3sconf/20199210002.
Full textAbstract:
The mechanical behaviour of the soil-structure interface plays a major role in the shear characteristics and bearing capacity of foundations. In thermo-active structures, due to non-isothermal conditions, the interface behaviour becomes more complex. The objective of this study is to investigate the effects of temperature variations on the mechanical behaviour of soils and soil-structure interface. Constant normal load (CNL) and constant normal stiffness (CNS) tests were performed on soil and soil-structure interface in a direct shear device at temperatures of 5, 22 and 60 °C. Kaolin clay was used as proxy for clayey soils. The results showed that, in clay samples the temperature increase, increased the cohesion and consequently the shear strength, due to thermal contraction during heating. The temperature rise had less impact on the shear strength in the case of the clay-structure interface than in the clay samples. The adhesion of the clay-structure interface, is less than the cohesion of the clay samples.
12
Alzaidy, Mohammed Nawaf Jirjees. "A Theoretical Study of Some Unsaturated Properties for Different Soils." Journal of University of Babylon for Engineering Sciences 26, no. 9 (November 1, 2018): 149–65. http://dx.doi.org/10.29196/jubes.v26i9.1720.
Full textAbstract:
Soil–water characteristic curves (SWCC) can be defined as the relationship between the water content and suction of an unsaturated soil. It considered a basic relation to explanation of the engineering behaviour of unsaturated soil such as hydraulic conductivity and shear strength, So the study of SWCC is useful to reduce the time and cost of unsaturated soil testing for different engineering purposes. An approach model has been used to predict the SWCC for different soils. The influence of the soils on SWCC shape, the unsaturated hydraulic conductivity and shear strength parameters have been studied in this paper using mathematical models. The results of SWCC show that suction of clay soil is bigger than sandy soil, while the clayey silt soils exhibit an intermediate behaviour at same water content. The values of unsaturated shear strength are increasing while the unsaturated hydraulic conductivity is decreasing with increasing soil suction. This behaviour of the last two parameters with soil suction should be taken in consideration for engineering purposes.
13
Colleuille, H., and E. Braudeau. "A soil fractionation related to soil structural behaviour." Soil Research 34, no. 5 (1996): 653. http://dx.doi.org/10.1071/sr9960653.
Full textAbstract:
To date, in order to characterise and understand soil behaviour, most emphasis has been placed on surrogate measurements of soil structure. However, a direct assessment of the structure of well-aggregated (pedal) soil samples can provide relevant information on soil organisation and lead to a better understanding of soil behaviour. In this paper, we suggest an original fractionation allowing natural soil structural elements, defined on morphological criteria and related to soil behaviour, to be separated. The soil samples come from 2 tropical sequences widespread in the intertropical zone: a ferrallitic and ferruginous soil sequence from Basse-Casamance (Senegal); and an alluvial soil sequence from the middle valley of the Senegal River. The principle of the fractionation is based on the concept of soil friability, and on the use of an organic solvent to separate primary structural units of soil samples first equilibrated at a specific soil water potential. This optimal soil water potential is selected on the basis of experimental studies and its relevance is discussed in relation to the particular structural properties of the soil occurring at this wetness.
14
Rampino, Celestino, Claudio Mancuso, and Filippo Vinale. "Experimental behaviour and modelling of an unsaturated compacted soil." Canadian Geotechnical Journal 37, no. 4 (August 1, 2000): 748–63. http://dx.doi.org/10.1139/t00-004.
Full textAbstract:
This paper reports the experimental study and modelling of the mechanical response of a silty sand used in the core of the Metramo dam, Italy. Specimens were prepared by compacting the soil at optimum water content conditions using the modified Proctor technique. Tests were performed under suction-controlled conditions by a stress path triaxial cell and an oedometer. The experimental program consists of 23 tests carried out in the suction range of 0-400 kPa. The findings indicate the strong influence of suction on compressibility, stiffness, and shear strength. The mechanical properties of the soil improve with suction following an exponential law with decreasing gradient. Furthermore, the soil exhibited collapsible behaviour upon wetting even at low stress levels. Interesting results were also achieved in elastoplastic modelling as well. The results led to characterization of soil behaviour with reference to widely accepted modelling criteria for unsaturated soils, providing noteworthy suggestions about their applicability for granular materials with a non-negligible fine component. Finally, some remarks are made for the extension under unsaturated conditions of the "Nor sand" model for saturated granular soils. The proposed approach yields improved predictions of deviator soil response of the tested soil when Cambridge-type frameworks prove invalid.Key words: unsaturated soils, stress state variables, triaxial tests, oedometer tests, constitutive model.
15
Kookana, R. S., S. L. Rogers, and D. P. Oliver. "Sorption and desorption behaviour of strychnine rodenticide in soils." Soil Research 35, no. 3 (1997): 491. http://dx.doi.org/10.1071/s96070.
Full textAbstract:
Strychnine (Strychnidin-10-one) was used as a rodenticide to control a mouse plague across southern Australia in 1993. Wheat grains were coated with a mixture (containing strychnine, sugar, flour, oil, and a dye) at a rate of 3 g strychnine/kg grain, and were spread as a bait for mice at a density of approximately 3 treated grains/m2. We examined the release of strychnine residue from the treated grains into soils and its sorption–desorption behaviour in 4 different South Australian soils, ranging from sand to clay in texture and acidic to alkaline in reaction. Release studies using treated grains showed that, unless the treated grains were buried in soil, the release of strychnine from the treated grain into soil was slow, requiring about 2 months for its complete transfer into soil. However, upon burial of the treated grain, such as during resowing, the transfer of strychnine from the treated grain to soil was rapid (>90% within 7 days). The sorption of strychnine was found to occur rapidly (>90% of sorption within 15 min). The sorption affinity of strychnine varied by almost 1 order of magnitude among the 4 soils studied. An acidic clay soil (Mintaro) sorbed nearly all (97%) of the applied strychnine, whereas the alkaline sandy soil (Bute) sorbed only 54% of the applied amount, when a strychnine solution 10 mg/L was equilibrated with the soil. Sorption was found to increase substantially with decreasing pHCa from 9 to 7. Indeed, in the 2 soils with relatively higher sorption capacities, nearly 100% of the applied strychnine was sorbed at pHCa 6·5. The pH dependency of sorption was found to follow the proportion of cationic species of strychnine base present in the soil solution. During desorption, hysteresis between the sorption and desorption isotherms of strychnine was noted. The study showed that except in very sandy, alkaline soils, the sorption of strychnine is likely to be high.
16
Safa Hussain Abid Awn and Waad Abdulsattar Zakaria. "Behaviour Of Calcarious Soil Subjected to Oil Derivatives." Diyala Journal of Engineering Sciences 7, no. 2 (June 1, 2014): 30–64. http://dx.doi.org/10.24237/djes.2014.07203.
Full textAbstract:
Calcareous or salty soils are the soils which are containing highly dissolved sodium or calcium salts in natural conditions. The dissolution of salts increases with temperature, atmospheric pressure, in addition to the acidity of the dissolves solution. Calcareous soil is stiff and very hard if it is in a dry phase; it becomes collapsible and very week when wetted with water. It is very dangerous for structures when constructing on such soil especially when high stresses are applied on it. Oil tanks or pipes may damage from any reason, and the oil products may leak from these structures to the soil and infiltrate through soil skeleton and may cause leaching to CaCO3 salt particles in some regions in Iraq, as example the Baiji Oil Station or Al-Mosel Dam, CaCO3 percent reaches more than 40%.This study shines the lights about the behavior of Calcareous soil subjected to three oil derivatives (kerosene oil, crude oil, gas oil and a sample wetted with water to make good comparison ,and study effect of addition of this products on the collapsibility.A laboratory model included soil with 70% and 50% CaCO3 compacted to 11 kN/m3. Fix stress system was used which applies 50 kN/m2, the loading frame was manufactured in a way that keeping the weights over footing stable without tilting. Three oil derivatives (Kerosene, Gasoil and crude oil) were used for laboratory model tests; by wetting Calcareous soil with it. One sample was wetted with water for comparison; the settlement was recorded with soaking time at a constant stress level.The results of laboratory model tests shows that the settlements results from specimens soaked with lubricating oil, Gasoil and Kerosene, are much less than the settlements that belong to soaking with water (reduce settlement to about one third) and considered high improvement of such problematic soil by wetting with oil derivatives.
17
Hu, Yafei, and Hung Q. Vu. "Analysis of soil conditions and pipe behaviour at a field site." Canadian Geotechnical Journal 48, no. 6 (June 2011): 847–66. http://dx.doi.org/10.1139/t11-010.
Full textAbstract:
Water main pipes buried in expansive soils are often subjected to severe distress subsequent to installation. Excessive stresses may be induced due to either differential movement of the soils or swelling pressures from the soils along the pipes, impairing their performance or even breaking them. Field monitoring is an important means for understanding soil behaviour and its interaction with water mains. For this purpose, field instrumentation was successfully installed to monitor the performance of a section of water main placed in a well-developed area of a city neighbourhood where more frequent pipe breakage had occurred in recent years. The instrumentation included sensors to measure pipe wall strains, pipe displacement, in situ soil water content, soil pressure, and temperature. The instruments were installed in both the soil backfill and native soil around the backfill. This paper presents the analyses of monitoring data collected during the first 3 years after instrument installation. It was observed that the soil and pipe behaviour was affected significantly by soil properties and seasonal changes and correlated closely with the change pattern of the local meteorological conditions.
18
Salager, Simon, Mathieu Nuth, Alessio Ferrari, and Lyesse Laloui. "Investigation into water retention behaviour of deformable soils." Canadian Geotechnical Journal 50, no. 2 (February 2013): 200–208. http://dx.doi.org/10.1139/cgj-2011-0409.
Full textAbstract:
The paper presents an experimental and modelling approach for the soil-water retention behaviour of two deformable soils. The objective is to investigate the physical mechanisms that govern the soil-water retention properties and to propose a constitutive framework for the soil-water retention curve accounting for the initial state of compaction and deformability of soils. A granular soil and a clayey soil were subjected to drying over a wide range of suctions so that the residual state of saturation could be attained. Different initial densities were tested for each material. The soil-water retention curves (SWRCs) obtained are synthesized and compared in terms of water content, void ratio, and degree of saturation, and are expressed as a function of the total suction. The studies enable assessment of the effect of the past and present soil deformation on the shape of the curves. The void ratio exerts a clear influence on the air-entry value, revealing that the breakthrough of air into the pores of the soil is more arduous in denser states. In the plane of water content versus suction, the experimental results highlight the fact that from a certain value of suction, the retention curves corresponding to different densities of the same soil are convergent. The observed features of behaviour are conceptualized into a modelling framework expressing the evolution of the degree of saturation as a function of suction. The proposed retention model makes use of the theory of elastoplasticity and can thus be generalized into a hysteretic model applicable to drying–wetting cycles. The calibration of the model requires the experimental retention data for two initial void ratios. The prediction of tests for further ranges of void ratios proves to be accurate, which supports the adequacy of formulated concepts.
19
Maghsoodi, Soheib, Olivier Cuisinier, and Farimah Masrouri. "Thermal effects on mechanical behaviour of soil–structure interface." Canadian Geotechnical Journal 57, no. 1 (January 2020): 32–47. http://dx.doi.org/10.1139/cgj-2018-0583.
Full textAbstract:
Mechanical behaviour of the soil–structure interface plays a major role in the shear characteristics and bearing capacity of foundations. In thermoactive structures, due to nonisothermal conditions, the interface behaviour becomes more complex. The objective of this study is to investigate the effects of temperature variations on the mechanical behaviour of soils and the soil–structure interface. Constant normal load (CNL) and constant normal stiffness (CNS) tests were performed on the soil and soil–structure interface in a direct shear device at temperatures of 5, 22, and 60 °C. Fontainebleau sand and kaolin clay were used as proxies for sandy and clayey soils. The sandy soil was prepared in a dense state and the clayey soil was prepared in a normally consolidated state. Results show that the applied thermal variations have a negligible effect on the shear strength of the sand and sand–structure interface under CNL and CNS conditions, and the soil and soil–structure interface behaviour could be considered thermally independent. In clay samples, an increase in the temperature increased the cohesion and consequently the shear strength, due to thermal contraction during heating. The temperature rise had less impact on the shear strength in the case of the clay–structure interface than in the clay samples. The adhesion of the clay–structure interface is less than the cohesion of the clay samples.
20
Sivapullaiah, P. V., A. Sridharan, and H. N. Ramesh. "Strength behaviour of lime-treated soils in the presence of sulphate." Canadian Geotechnical Journal 37, no. 6 (December 1, 2000): 1358–67. http://dx.doi.org/10.1139/t00-052.
Full textAbstract:
Lime has been used extensively to improve the shear strength of fine-grained soils. It has been recently reported that the presence of sulphate causes abnormal volume changes in lime-stabilized soil. The paper presents the strength behaviour of lime-treated montmorillonitic natural black cotton soil in the presence of varying sulphate contents after curing for periods of up to 365 days. Alteration of soillime reactions in the presence of sulphate affects the strength development by cementation. Consequently, the stressstrain behaviour effective stress paths of soil cured with sulphate are similar to those of normally consolidated soil rather than cemented soils. The reduction in shear strength due to a reduction in effective cohesion intercept occurs for lime-treated soil cured with sulphate for long periods.Key words: clays, cohesion, fabric, friction, shear strength.
21
Gould, Scott J. F., Jayantha Kodikara, Pathmanathan Rajeev, Xiao-Ling Zhao, and Stewart Burn. "A void ratio – water content – net stress model for environmentally stabilized expansive soils." Canadian Geotechnical Journal 48, no. 6 (June 2011): 867–77. http://dx.doi.org/10.1139/t10-108.
Full textAbstract:
A new mathematical model is presented that describes the shrinkage curve of environmentally stabilized soils. Environmentally stabilized soils are defined as those that have undergone a sufficient number of wet–dry cycles to reach a stable soil structure. The model is applicable for fitting to soils that exhibit all typical zones of soil shrinkage behaviour and to those soils that do not exhibit structural and (or) residual shrinkage behaviour. The fitting parameters in this model are directly related to features of the shrinkage curve and have direct relevance to soil mechanics theory and practice. The model is applied to data from 20 different datasets reported in literature with excellent fitting achieved. This model is extended to incorporate the effect of net stress, creating a surface describing soil volumetric behaviour in response to changes in water content and net stress.
22
Jefferies, M., P. Delage, and F. Cotecchia. "Contributions toGéotechnique1948–2008: Soil behaviour." Géotechnique 58, no. 5 (June 2008): 429–33. http://dx.doi.org/10.1680/geot.2008.58.5.429.
Full text
23
Wong, D. H., K. Sivasithamparam, and M. J. Barbetti. "Soil-Behaviour of Phytophthora clandestina." Journal of Phytopathology 116, no. 1 (May 1986): 67–73. http://dx.doi.org/10.1111/j.1439-0434.1986.tb00895.x.
Full text
24
Addiscott, T. M. "Simulation modelling and soil behaviour." Geoderma 60, no. 1-4 (December 1993): 15–40. http://dx.doi.org/10.1016/0016-7061(93)90016-e.
Full text
25
Feda, Jaroslav. "Physical models of soil behaviour." Engineering Geology 72, no. 1-2 (March 2004): 121–29. http://dx.doi.org/10.1016/j.enggeo.2003.07.003.
Full text
26
Holý, Karol, Monika Műllerová, Martin Bulko, Oľga Holá, and Terézia Melicherová. "Outdoor 222Rn behaviour in different areas of Slovakia." Nukleonika 61, no. 3 (September 1, 2016): 281–88. http://dx.doi.org/10.1515/nuka-2016-0047.
Full textAbstract:
Abstract Radon activity concentration (RAC) in the outdoor atmosphere was monitored in four localities of Slovakia. The distance between the localities were up to 130 km. The localities had a diverse orography, ranging from flatland to hilly terrain. A significant influence of orography and 226Ra and 222Rn content in soil on diurnal time series of RAC was found. A simple approach of determining radon exhalation rate from soil based on the increase of RAC from daily minima to maxima and removal characteristic of radon is presented. A linear dependency between radon exhalation rate from the soil and RAC in the soil gas at a depth of 0.8 m was found for sandy soils.
27
Fogat, Sunitha, Rohtas Kumar, Amit Dhankar, Jyoti, and Kavita. "Release Behaviour of Phosphorus and Its Fractions in Different Phosphorus Status Soils." International Journal of Plant & Soil Science 35, no. 8 (March 31, 2023): 19–25. http://dx.doi.org/10.9734/ijpss/2023/v35i82878.
Full textAbstract:
Phosphorus is essential to all forms of life and its contribution towards aiding the native soil fertility and sustaining it, is well known. With passage of time, P added to soil undergoes transformation into various unavailable forms. Native P compounds, some being highly insoluble are mostly unavailable for plant uptake. The availability of phosphorus to the plants depends on soil properties, soil pH, soluble iron, aluminum and manganese, calcium minerals, organic matter, activities of microorganisms thus availability of P may vary according to soil types. Knowing the changes in P fractions especially in low and in high P status soils is much more important for P availability to plant. Therefore, the release behaviour of phosphorus and its fraction in different P status soils was assessed over 5 weeks under laboratory incubation periods using a sequential fractionation procedure. The results of the experiment revealed that the content of available P and different P fractions were higher in high P status soil as compared to low P status soil. Among the various P fractions, Ca-P was the dominant fraction in both soils. The release of available P was first increased up to 21 and 28 days in low and high P status soil, respectively and the release of different forms of P fractions in both soils increased up to 28 days after incubation and then decreased with further increase in incubation period.
28
Md. Noor, M. J., and M. F. Jamain. "Pull Out and Creep Behaviour of Soil Nailing – A Case Study." Journal of Mechanical Engineering 16, no. 1 (April 1, 2019): 189–211. http://dx.doi.org/10.24191/jmeche.v16i1.6072.
Full textAbstract:
The use of soil nails for slope strengthening is one of the popular methods since 1980s due to the attractive benefits of simple and fast installation method to reinforce cut slope. Proper assessment of the soil nail behavior between the nails and the surrounding soil will contribute to the safe and economical design of the reinforced soil structure. At present, the safety factor is adapted to soil nailing design and analysis, however, some soil nailed slope, which are designed, in compliance to the slope guidelines end up with failure. For the current knowledge, there is limited information on the loss of the shaft friction in soil nailing due to creep and the research on the behavior of the soil nail is also limited. Hence, in order to provide additional information on the behavior of the conventional soil nailing system, the bore holes and pull out test data were collected from the various projects: 1) Cheras, Kuala Lumpur, 2) Penang Hill, Penang, and 3) Kajang, Selangor. This study is focused on the behavior of the soil nail under pull out test at various types of soils and different soil nails characteristics. The parameters measured are soil nail pull out resistance and displacement of soil nails under different loading. In addition, the creep behavior of the soil nail was a study based on the displacement under maintain period at maximum test load during the pullout test. The creep behavior of soil nail is causing the loss of tension in the soil nail and that affecting the performance of the engineered slope. For the study and result presented, it is clear that soil nail under certain types of soil, especially dry, poorly graded cohesionless soils or soil with high water table is creep susceptible and had a lower pull out resistance. Pull out test on soil nail installed in medium stiff clayey Silt and sandy Silt and socketed in rock is performing up to design expectation.
29
Djurovic-Pejcev, Rada, Svjetlana Radmanovic, Zorica Tomic, Lazar Kaludjerovic, Vojislava Bursic, and Ljiljana Santric. "Adsorption-desorption behaviour of clomazone in Regosol and Chernozem agricultural soils." Journal of the Serbian Chemical Society 85, no. 6 (2020): 809–19. http://dx.doi.org/10.2298/jsc190917122d.
Full textAbstract:
Studies of adsorption and desorption of pesticides by soils are important for understanding and predicting their fate and transmission in the environment. Considering the agricultural and environmental relevance of clomazone, its sorption?desorption behaviour was studied in two widespread Serbian agricultural soil types named Regosol and Chernozem. Both phenomena are well-described by the Freundlich equation, which shows that clomazone is generally sorbed more to organic matter than to the mineral soil fractions. Chernozem, a soil containing more of both organic matter and clay, was found to bind more, and desorb less herbicide, than Regosol. Higher desorption hysteresis obtained for Chernozem could be attributed to its larger number of high- -energy sorption sites, compared to Regosol. In both soils, the hysteresis effect increases with the rise of initial clomazone concentration in the soil-water system, while the percentage of desorbed amount during successive desorption cycles decreases. The presented adsorption?desorption study shows that soil composition plays an important role in clomazone behaviour and fate in the environment, and a significantly reduced probability of contamination of both the deeper soil layers and groundwater may be expected when this herbicide is found in humus-rich soils
30
Eigenbrod, K. D., J. P. Burak, and J. G. Locker. "Differential shear movements at soil-geotextile interfaces." Canadian Geotechnical Journal 27, no. 4 (August 1, 1990): 520–26. http://dx.doi.org/10.1139/t90-066.
Full textAbstract:
The shear deformation behaviour along soil–geotextile interfaces has been investigated and is compared with that of the respective soils. Six soils (two sands, two clays, and two peats) in combination with eight different geotextiles (woven and nonwoven) were tested at various conditions in direct shear. It was found that the stiffnesses during shearing for the sand-geotextile interfaces were less than those for the actual sand, by a factor that was largely independent of the normal stress level. The same behaviour was found for the clays and for one of the peats in contact with non-woven geotextiles. For woven geotextile interfaces in contact with the clays and the peats, the load deformation behaviour was generally stiffer than for the actual soils. Key words: geotextiles, differential shear, soil–geotextile interfaces, load transfer during shear.
31
Lim, B. F., and G. A. Siemens. "Unifying framework for modeling swelling soil behaviour." Canadian Geotechnical Journal 53, no. 9 (September 2016): 1495–509. http://dx.doi.org/10.1139/cgj-2015-0049.
Full textAbstract:
The destructive effect of expansive soils on infrastructure is one of the classical issues associated with unsaturated soils. Given the continuing challenges associated with swelling soils there is still a need for a practical analysis method. The swelling equilibrium limit (SEL) provides a concept for modeling expansive soil behaviour. The SEL is an upper bound swelling limit, which depends on the soil’s initial state and the boundary conditions upon wetting. The SEL is obtained experimentally from swelling tests performed by applying a range of swelling scenarios from rigid boundary condition to free swelling without confinement. In this paper, improvements to the triaxial swelling apparatus are reported, SELs for two new swelling soils are characterized, and a framework for SEL prediction is developed. The SEL framework is developed to relate SEL parameters to index properties as well as the soil’s initial volume. SEL parameters are correlated to liquid limit, plasticity index, free swell potential, and specific volume. The relationships are used to estimate the SEL for Regina clay, which is shown to agree with experimental data.
32
Singh, B., and RJ Gilkes. "Sorption-desorption behaviour of caesium in some Western Australian soils." Soil Research 28, no. 6 (1990): 929. http://dx.doi.org/10.1071/sr9900929.
Full textAbstract:
Soil caesium-137 derived from past atmospheric nuclear tests is increasingly being used as an indicator of soil erosion and deposition on the basis that fallout 137Cs has been retained by soils, although this assumption has not been thoroughly tested for different soils. The sorption behaviour of some Western Australian soils indicates that Cs is differentially sorbed as a consequence of differences in clay mineralogy. Kaolinitic sandy soils of low exchange capacity sorb Cs in preference to Ca and Na, with the specificity for Cs being higher at lower concentrations of Cs in solution. lllitic and smectitic soils sorbed more Cs than kaolinitic soils and retained more than 50% of sorbed Cs after a series of extractions with salt solutions. Retention by kaolinitic soils was less but, for the concentrations of Cs likely to occur in soils, it seems that most Cs is retained so that it is probable that the 137Cs technique can be used with confidence for the measurement of soil erosion and deposition for many Western Australian soils.
33
Di Tommaso, Teodoro, Stella Lovelli, Mariana Amato, and Michele Perniola. "Shrinking Behaviour of Badland Soil Under Different Soil Covers." Italian Journal of Agronomy 4, no. 2 (June 30, 2009): 27. http://dx.doi.org/10.4081/ija.2009.2.27.
Full text
34
Yoka Khail, Bilal, Mathilde Morvan, and Pierre Breul. "Behavior of unsaturated pelitic soil in a railway context." E3S Web of Conferences 195 (2020): 01010. http://dx.doi.org/10.1051/e3sconf/202019501010.
Full textAbstract:
As part of the rehabilitation work on the Gabonese railway line, the Trans-Gabon Railway, it was necessary to analyse the behaviour of the materials constituting the subgrade soil. These soils are pelitic soils whose behaviour under unsaturated conditions and cyclic loading has not been studied before and which present differential settlements and lack of bearing capacity. In this article, we focus on the characterization of the subgrade soil. The objective of this work is first to determine the in-situ characteristics of the pelitic soil and be able to link these characteristics with the behaviour studied in laboratory. For that purpose, we propose an in-situ investigation based on the use of light dynamic penetrometric tests in order to assess the variability of the subgrade layer and a drying-wetting test to assess the influence of hydric stress on the drainage path of the studied soil. We present the results of in-situ tests performed on a study area. We also present the results of the tests to determine the soil water characteristic curves (SWCC) and the curves describing the volumetric behaviour of this soil when exposed to drying.
35
Burghignoli, A., A. Desideri, and S. Miliziano. "A laboratory study on the thermomechanical behaviour of clayey soils." Canadian Geotechnical Journal 37, no. 4 (August 1, 2000): 764–80. http://dx.doi.org/10.1139/t00-010.
Full textAbstract:
This paper presents the findings of a laboratory investigation of the thermomechanical behaviour of clayey soils. The tests were performed on reconstituted and natural clayey soils using triaxial cells modified to control temperature. The range of temperatures that were investigated is from 20° to 60°C. The thermal behaviour of the clays and the influence of temperature on their mechanical behaviour were investigated separately. The analysis of the experimental results obtained in drained and undrained nonisothermal tests and during thermal consolidation made it possible to identify a link between the thermal and the time-dependent behaviour of the soil skeleton. Therefore, as for creep processes, the response of the soil to thermal loading is not unique but among other factors depends strongly on the overall and recent stress history experienced by the soil. In the range of temperatures investigated, the deformability and strength of the soil were found to be relatively independent of temperature. Stiffening of the soil results from thermal cycles.Key words: clay, temperature, creep, stress history, recent stress history.
36
Zhan, Zhiqi, and Chao Zhou. "SimuIating landsIides using two-phase two-point material point method." E3S Web of Conferences 382 (2023): 13009. http://dx.doi.org/10.1051/e3sconf/202338213009.
Full textAbstract:
Material point method (MPM) is an effective numerical method for large-deformation analysis under unsaturated conditions. In the previous studies, water retention ability and permeability function were assumed to be Independent of soil deformation. Besides, most studies used a single set of material points, so some processes (e.g., the infiltration of free water into unsaturated soil) cannot be modelled. Thereby, a two-point MPM approach has been extended from saturated to unsaturated soils. The required information of soild and liquid phases is carried by two individual sets of material points, with the assumption of zero pore air pressure. GIMP is applied for space discretisation. In the modelling of hydraulic behaviour, the porosity-dependent water retention curve and permeability function are incorporated. A centrifuge test about rainfall-induced unsaturated soil slope failure is simulated to investigate the influence of the porosity-dependent water retention curve and permeability function. Parametric studies demonstrate soil parameters for water retention behaviour and shear strength play significant roles in the slope failure mechanisms.
37
Kumar, Amit, and Dharmender Kumar Soni. "Study of the Mechanical Behaviour of a Clayey Soil Under Normal and Frozen Conditions." Slovak Journal of Civil Engineering 27, no. 2 (June 1, 2019): 29–35. http://dx.doi.org/10.2478/sjce-2019-0013.
Full textAbstract:
AbstractLime and cement are quite compatible for stabilizing clayey soils; changes in a thermal regime may inversely affect the advantages of stabilized soil. The present study interprets changes in the mechanical behaviour of frozen and unfrozen Himalayan soil samples through an unconfined compressive strength test. The soil was treated with ground eggshell powder (3%-9%) and alkali activator (Sodium chloride) (2%-6%); it was reinforced with arbitrarily distributed polypropylene fibers (0.05%-0.15%). Standard 7, 14 and 21-day-old soil specimens were tested in unfrozen conditions, while fresh 21-day-old soil specimens were tested after 3, 5 and 10 freeze-thaw cycles. The design of the experiments was based on the Taguchi technique and arranged in an orthogonal array. The results of the research clearly show that poultry waste (eggshell powder) and alkaline soil stabilizer improved the strength behaviour of the subject soil. On the other hand, the polypropylene fibers played an important role in changing the brittle behaviour of the stabilized soil to ductile behaviour. The sudden collapse of a structure may be avoided by using polypropylene fibers.
38
Tuan Ismail, Tuan Noor Hasanah, Siti Aimi Nadia Mohd Yusoff, Ismail Bakar, Devapriya Chitral Wijeyesekera, Adnan Zainorabidin, Mastura Azmi, Muhd Harris Ramli, and Alvin John Lim Meng Siang. "Engineering behaviour of stabilized laterite and kaolin using lignin." MATEC Web of Conferences 250 (2018): 01008. http://dx.doi.org/10.1051/matecconf/201825001008.
Full textAbstract:
Soils at many sites do not always have enough strength to bear the structures constructed over them and some of the soil may need to be stabilized in order to improve their geotechnical properties. In this paper, routine laboratory tests were critically carried out to investigate the efficacy of lignin in improving the strength behaviour of the soils. Two different soil samples (laterite and kaolin) were studied and mixed with different proportions of lignin (2% and 5% of dry weight of soil), respectively. Unconfined Compressive Strength (UCS) characteristics evaluated in this study were done on samples at their maximum dry density and optimum moisture content (obtained from compaction tests). The UCS tests on all the specimens were carried out after 0, 7, 15, 21 and 30 days of controlled curing. The research results showed that the addition of lignin into kaolin reduced its maximum dry density while giving progressively higher optimum moisture content. Contrarily, with the laterite soil, both maximum dry density and optimum moisture content simultaneously increased when lignin was added into the soils. The UCS results showed that the the stabilized laterite with 2% lignin continued to gain strength significantly at a fairly steady rate after 7 days. Unfortunately, lignin did not show a significant effect in kaolin.
39
Zangana, Dhiaadin Bahaadin Noori. "The Behaviour of Confined Granular soil loaded by a square footing." Journal of Zankoy Sulaimani - Part A 17, no. 4 (May 31, 2015): 95–110. http://dx.doi.org/10.17656/jzs.10428.
Full text
40
Abeyrathne, Arunodi, Vinayagamoothy Sivakumar, and Jayantha Kodikara. "Isotropic volumetric behaviour of compacted unsaturated soils within specific volume, specific water volume, mean net stress (v, vw, p) space." Canadian Geotechnical Journal 56, no. 12 (December 2019): 1756–78. http://dx.doi.org/10.1139/cgj-2018-0230.
Full textAbstract:
A detailed description of the volumetric behaviour of compacted unsaturated soils is essential for modelling compacted soil behaviour. It is more complex than when the soil is saturated, as unsaturated soils exhibit a range of responses, such as yielding under loading, swelling and collapse under wetting, and shrinkage and cracking during drying. In unsaturated modelling, (v, s, p) or (v, s, p′) is commonly used as the state space to describe volumetric behaviour, where v (= 1 + void ratio, e) is the specific volume; s is the soil suction; and p and p′ are the mean net and mean effective or skeleton stress, respectively. An alternative approach is to use (v, vw, p) space to describe volumetric behaviour, where vw is specific water volume. In either case, coupled water retention behaviour is needed to describe the overall macroscopic process more completely by including the fourth state variable (vw or degree of saturation, Sr, for the former and s for the latter). Following from work undertaken under one-dimensional conditions, the current paper presents the volumetric behaviour of compacted kaolin in (v, vw, p) space. A series of state path tests comprising various loading, unloading, and (or) wetting paths with nondecreasing degrees of saturation was carried out. The results show that a state boundary surface that is also the virgin compaction surface depicting the loosest state of soil takes control of the volumetric behaviour in (v, vw, p) space, which can be used as a more practical approach to modelling compacted soil behaviour, especially for analysing major wetting events.
41
Estabragh, A. R., A. A. Javadi, and J. C. Boot. "Effect of compaction pressure on consolidation behaviour of unsaturated silty soil." Canadian Geotechnical Journal 41, no. 3 (June 1, 2004): 540–50. http://dx.doi.org/10.1139/t04-007.
Full textAbstract:
The effect of compaction pressure on subsequent soil behaviour during isotropic consolidation has been investigated by conducting controlled-suction triaxial tests on samples of an unsaturated compacted silty soil. A comprehensive set of laboratory experiments was carried out in a double-walled triaxial apparatus on samples of unsaturated soil that were prepared using two different compaction pressures. The axis translation technique was used for creating the desired suctions in the samples. In the experiments, the soil samples were subjected to isotropic consolidation under constant suctions. The results show that different compaction pressures produce different fabrics in a soil and therefore affect the behaviour of the soil. The results also show that the value of yield stress and the location of the loadingcollapse (LC) yield curve are functions of soil fabric. Furthermore, it is shown that the slopes of normal consolidation lines for densely and loosely compacted samples differ in unsaturated conditions but are the same in saturated soils. A comparison is made between the behaviour of the dense and loose samples, and the difference in the behaviour is explained.Key words: suction, unsaturated soil, compaction, consolidation, soil fabric.
42
Liu, M. D., and J. P. Carter. "A structured Cam Clay model." Canadian Geotechnical Journal 39, no. 6 (December 1, 2002): 1313–32. http://dx.doi.org/10.1139/t02-069.
Full textAbstract:
A theoretical study of the behaviour of structured soil is presented. A new model, referred to as the Structured Cam Clay model, is formulated by introducing the influence of soil structure into the Modified Cam Clay model. The proposed model is hierarchical, i.e., it is identical to the Modified Cam Clay soil model if a soil has no structure or if its structure is removed by loading. Three new parameters describing the effects of soil structure are introduced, and the results of a parametric study are also presented. The proposed model has been used to predict the behaviour of structured soils in both compression and shearing tests. By making comparisons of predictions with experimental data and by conducting the parametric study it is demonstrated that the new model provides satisfactory qualitative and quantitative modelling of many important features of the behaviour of structured soils.Key words: calcareous soils, clays, fabric, structure, constitutive relations, plasticity.
43
Ekeoma, Emmanuel Chukwudi, Ugochukwu Nnatuanya Okonkwo, and Adegboyega Oduniyi Odumade. "MATLAB PROGRAM FOR RATING SOILS BASED ON ENGINEERING BEHAVIOURS." Journal of Civil Engineering, Science and Technology 14, no. 1 (April 19, 2023): 52–63. http://dx.doi.org/10.33736/jcest.5078.2023.
Full textAbstract:
Engineering behaviour of soils is an important attribute to be considered as the foundation or even construction materials for civil engineering structures. One critical issue encountered by geotechnical engineers in construction works is predicting the engineering behaviour of soil with a view to assessing its suitability for any given construction purpose. Rating of soils based on their engineering behaviours can be achieved by classifying the soil into different groups and sub-groups of similar characteristics. Soil classification systems usually involve the use of charts, tables and curves, which is no longer fashionable because it might be very rigorous when many soils are involved. The use of software techniques simplifies the whole process. This study developed an algorithm in the form of a MATLAB program for easy classification of soil based on the Unified Soil Classification System (USCS), American Association of State Highway and Transport Officials (AASHTO), Plasticity Chart and the Indian Soil Classification Systems (ISCS), which makes the program unique. Soil samples used for illustration were collected and characterised depending on particle size analysis as well as consistency indices. A comparative study was carried out between classifying the soil using a manual approach and the MATLAB program. The MATLAB program rated Soil Sample A to be fine-grained, which belongs to soil groups A-7-6(15), CL (inorganic clay that has medium plasticity) and MI or OI (inorganic silt of medium plasticity or organic silt of medium plasticity) while Soil Sample B was rated to be coarse-grained belonging to A-1-b (0), SM (Silty Sand) and SM (Silty Sand) in the AASHTO, USCS and ISCS classification systems respectively. The results of the classification systems from the MATLAB program were completely in conformity with the results obtained from the manual approach. Thus, the MATLAB program gave a very high degree of accuracy of almost 100%.
44
Bruno, Agostino Walter, Domenico Gallipoli, Mohamed Rouainia, and Marti Lloret-Cabot. "A single-stress model for the prediction of yielding of unsaturated cemented soils under isotropic loads." E3S Web of Conferences 195 (2020): 02001. http://dx.doi.org/10.1051/e3sconf/202019502001.
Full textAbstract:
This paper presents a bounding surface model predicting the combined effects of cementation and partial saturation on the mechanical behaviour of soils subjected to isotropic loading. The loss of cementation caused by loading, wetting or drying of a normally consolidated soil is described by a “cementation bonding function”. This states that, under virgin conditions, the ratio between cemented and uncemented void ratios monotonically decreases with increasing levels of scaled stress. The scaled stress is the variable governing the intrinsic behaviour of the soil under both saturated and unsaturated conditions. Combination of the cementation bounding function with a previously proposed model for unsaturated soil behaviour leads to the formulation of a “cemented unified normal compression line” (CUNCL). This describes the virgin behaviour of both cemented and uncemented soils under saturated and unsaturated conditions. Progressive yielding is modelled by assuming that the slope of the generic loading curve tends towards the slope of the CUNCL as the soil state moves from overconsolidated to virgin conditions. The model has been calibrated and validated against existing experimental data demonstrating a good ability to predict the void ratio of cemented soils during isotropic loading, unloading and wetting under both saturated and unsaturated conditions.
45
Dawes, L., and A. Goonetilleke. "Using undisturbed columns to predict long term behaviour of effluent irrigated soils under field conditions." Soil Research 44, no. 7 (2006): 661. http://dx.doi.org/10.1071/sr06030.
Full textAbstract:
Soils have only a finite capacity for the removal of wastewater pollutants, and with time this capacity could decline. Not all soil types have the capacity to provide adequate treatment and dispersal of sewage effluent. For continued long-term application to be successful, it is essential that infiltration and drainage characteristics of soils do not decline. Also critical is how long-term application of nutrients and cations affects the soils and whether any leaching occurs. The research project described compares the outcomes of detailed field studies with results from an undisturbed soil column study where typical soils in the south-east region of Queensland, Australia, have been subjected to sewage effluent application over a period of 12 months. Multivariate analysis helped to classify the influential soil characteristics and to identify relative changes in each soil after the application of effluent. Identification and correlation of influential soil characteristics in field and accelerated column studies confirmed that undisturbed soil column studies can be useful in predicting long-term behaviour of effluent-irrigated soils.
46
Randeniya, Chamal, D. J. Robert, Chun-Qing Li, and Jayantha Kodikara. "Large-scale experimental evaluation of soil saturation effect on behaviour of buried pipes under operational loads." Canadian Geotechnical Journal 57, no. 2 (February 2020): 205–20. http://dx.doi.org/10.1139/cgj-2018-0544.
Full textAbstract:
The behaviour of pipelines in unsaturated soil is fundamentally different from that of pipelines buried in dry or saturated soils. However, the effect of soil saturation on buried pipe behaviour has been overlooked in past research mainly due to the very limited large-scale experimental studies available. Most of the available studies on buried pipes in unsaturated soil are based on numerical modelling that analyses the pipe behaviour using a calibrated soil model developed on the basis of fundamental unsaturated soil characteristics. Investigations with such approaches may not be acceptable owing largely to unverified or complicated pipe–soil interactions and three-dimensional stress re-distributions. In this paper, the effect of soil saturation on buried pipe behaviour is investigated using a comprehensive large-scale experimental setup. A detailed methodology of large-scale testing, which was used to obtain pipe deformations as well as soil stresses with reference to a cast iron pipeline buried in low-plasticity clay under different soil saturation levels, is presented. The results obtained from large-scale experiments are compared with those of three-dimensional finite element analysis. Results produced in this paper reveal that the degree of water saturation of backfill soil can significantly affect the pipe deformation under internal and external loadings.
47
Speranza, Gianluca, Alessio Ferrari, Maxime Pousse, and Lyesse Laloui. "An experimental investigation on the water retention behaviour of a silty soil for the computation of the lateral earth thrust on a retaining wall." E3S Web of Conferences 92 (2019): 07011. http://dx.doi.org/10.1051/e3sconf/20199207011.
Full textAbstract:
Retaining structures often interact with soils in unsaturated conditions and their performance is influenced by environmental actions. Currently, geotechnical analysis and design approaches mainly consider the soils either totally dry or totally saturated. Environmental actions, like infiltration due to rainfall, can significantly affect the lateral earth pressure of soils, influencing the performance of both temporary or permanent retaining structures. This paper deals with the investigation of the water retention behaviour of a silty soil for the computation of the soil thrust on a retaining wall during rainfall events. In this regard, the retention property of the involved geomaterial is investigated in laboratory through the combined use of high capacity tensiometers (HCT) and a dew-point hygrometer (WP4C). Considering drying and wetting paths, the experimental results are employed to calibrate the water retention behaviour for the computation of the failure shear strength of the geomaterial. The importance to monitor volume change during the characterization of the water retention behaviour of fine soils is highlighted. A series of analytical uncoupled hydro-mechanical analyses is performed to estimate the changing in the thrust of an unsaturated soil on a retaining wall under several infiltration rates. An appropriate modelling of the soil water retention behaviour is resulted to be crucial for the computation of lateral earth thrust.
48
Srivastava, Shubham, Deepti Verma, Bala Ramudu Paramkusam, and Rajesh Kumar. "Determination of Hydrocarbon Contaminated Soil Properties and Behaviour as Predicted by Critical State Model." ECS Transactions 107, no. 1 (April 24, 2022): 1355–62. http://dx.doi.org/10.1149/10701.1355ecst.
Full textAbstract:
The petroleum industry effluents and oil spills cause a serious threat to the ecology and to the soil properties leaving it to be of limited and no use. Bioremediation is done for such hydrocarbon contaminated soils. However, for determining their alternative usage in reference to construction industry, it is essential to analyze their properties. In this study, hydrocarbon contaminated soil properties were determined by triaxial tests under consolidated drained and consolidated undrained condition for both normally consolidated and over consolidated soil in conjunction with the soil behaviour as predicted by the critical state model. Due to the tension between the hydrocarbon in the pores of soil and water, complete saturation could not be achieved and the sample also disintegrated upon application of back pressure. Under near saturation condition the tests were performed, however, the contaminated soil didn’t not show soil softening even in case of over consolidated soils.
49
Robertson, P. K. "Cone penetration test (CPT)-based soil behaviour type (SBT) classification system — an update." Canadian Geotechnical Journal 53, no. 12 (December 2016): 1910–27. http://dx.doi.org/10.1139/cgj-2016-0044.
Full textAbstract:
A soil classification system is used to group soils according to shared qualities or characteristics based on simple cost-effective tests. The most common soil classification systems used in geotechnical engineering are based on physical (textural) characteristics such as grain size and plasticity. Ideally, geotechnical engineers would also like to classify soils based on behaviour characteristics that have a strong link to fundamental in situ behaviour. However, existing textural-based classification systems have a weak link to in situ behaviour, since they are measured on disturbed and remolded samples. The cone penetration test (CPT) has been gaining in popularity for site investigations due to the cost-effective, rapid, continuous, and reliable measurements. The most common CPT-based classification systems are based on behaviour characteristics and are often referred to as a soil behaviour type (SBT) classification. However, some confusion exists, since most CPT-based SBT classification systems use textural-based descriptions, such as sand and clay. This paper presents an update of popular CPT-based SBT classification systems to use behaviour-based descriptions. The update includes a method to identify the existence of microstructure in soils, and examples are used to illustrate the advantages and limitations of such a system.
50
Hussain Abid Awn, Safa, and Waad Abdulsattar Zakaria. "Behaviour of Retaining Wall Founded on Collapsible Soil – A Prototype Laboratory Study." Diyala Journal of Engineering Sciences 7, no. 3 (September 1, 2014): 1–24. http://dx.doi.org/10.24237/djes.2014.07301.
Full textAbstract:
Retaining walls may be required in a location where gypsum may present in soil in large percentages .The behavior of retaining walls on ordinary soils is well known but the behavior of retaining walls resting on gypseons soils may be not well understood as the case of ordinary soils.In this study it is intended to reflect the behavior of gravity retaining wall resting on collapsible soil. And to do so a small prototype model (600mm*500mm*200mm) is used with soil mixed in presumed percentages with different gypsum percentages (5%, 20%, 30%, 50%). In addition to a model with 30% gypsum and treated with 2.7% Cement dust mixed with soil founded retaining wall structure. After preparing the foundation gypseous soil, a small glass made retaining wall filled with sand, which represent gravity wall, is put over such bed and backfilled with ordinary sandy soil. Dial gauges are placed to side and top of wall to measure the rotation settlement behavior and collapse of system. 4kPa stress are applied to backfill soil as to accelerate collapse with leaching process commenced. Data are recorded and analyzed completely, which shows the behavior of such structures embedded with different gypsum content.The improvement in rotation settlement and collapse for the retaining wall model reaches more than 89%, was gained after treating the embedded gypseous soil layer, with 2.7% cement dust.