Letteratura scientifica selezionata sul tema "WETTING SWCC"
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Articoli di riviste sul tema "WETTING SWCC"
1
Satyanaga, Alfrendo, Jong Kim, Sung-Woo Moon e Martin Wijaya. "Exponential Functions for Modelling Hysteresis of Soil-Water Characteristic Curves". E3S Web of Conferences 195 (2020): 02002. http://dx.doi.org/10.1051/e3sconf/202019502002.
Testo completoAbstract (sommario):
Soil – water characteristic curve (SWCC) is an important property of unsaturated soils that can be used to estimate various parameters to describe unsaturated soil behavior. SWCC is reported to be hysteretic because the water content at a given suction in the wetting process is less than that in the drying process. In order to simulate the hysteretic characteristics of SWCC, many models have been proposed by different researchers. However, majority of the existing models are complex and their parameters are not related to the physical significances of SWCC variables. In this study, the new equations are developed to model drying and wetting SWCC. In addition, some indexes are proposed to estimate the wetting SWCC from drying SWCC. The new equations for SWCCs were evaluated with the laboratory data from published literatures. The results showed that the proposed equations performed well in modelling drying and wetting SWCC. The new equation has less parameters than the existing published equation.
2
Yang, Hong, Harianto Rahardjo, Eng-Choon Leong e D. G. Fredlund. "Factors affecting drying and wetting soil-water characteristic curves of sandy soils". Canadian Geotechnical Journal 41, n. 5 (1 settembre 2004): 908–20. http://dx.doi.org/10.1139/t04-042.
Testo completoAbstract (sommario):
Drying and wetting soil-water characteristic curves (SWCCs) for five sandy soils are investigated using a Tempe pressure cell and capillary rise open tube. The test data are fitted to two SWCC equations using a least-squares algorithm. The obtained fitting parameters and some hysteretic behaviour are discussed and correlated with grain-size distribution parameters. A concept of total hysteresis is proposed to quantify the hysteresis of SWCC. The measured SWCC for one soil is also compared with the SWCC estimated from its grain-size distribution. The SWCC was also obtained at a high dry density for one of the soils. The results show that the shapes of the SWCCs are similar to the grain-size distributions of the soils and are affected by the dry density of the soil. A coarse-grained soil has a lower air-entry value, residual matric suction, and water-entry value and less total hysteresis than a fine-grained soil. The residual matric suction and water-entry value tend to approach the same value when the effective grain size D10 of the soil is small, in the range of 3-6 mm. SWCCs of uniform soils have steeper slopes and less total hysteresis than those of less uniform soils. Soils with a low dry density have a lower air-entry value and residual matric suction than soils with a high dry density. The SWCC predicted from grain-size distribution is found to be sufficiently accurate.Key words: soil-water characteristic curve, water content, suction, hysteresis, grain size.
3
Zeng, Ling, Fan Li, Jie Liu, Qianfeng Gao e Hanbing Bian. "Effect of initial gravimetric water content and cyclic wetting-drying on soil-water characteristic curves of disintegrated carbonaceous mudstone". Transportation Safety and Environment 1, n. 3 (12 dicembre 2019): 230–40. http://dx.doi.org/10.1093/tse/tdz018.
Testo completoAbstract (sommario):
Abstract The soil-water characteristic curve (SWCC) is often used to estimate unsaturated soil properties (e.g. strength, permeability, volume change, solute and thermal diffusivity). The SWCC of soil samples is significantly affected by cyclic wetting-drying. To examine how water content and cyclic wetting-drying affect the SWCC of disintegrated carbonaceous mudstone (DCM), SWCC tests were implemented using a pressure-plate apparatus. In addition, SWCC models for DCM considering the initial gravimetric water content and cyclic wetting-drying were developed. The test results showed that the volumetric water content (θ) of the DCM first decreased rapidly and then became stable as matric suction (s) increased. The initial water content affected the SWCC by altering the pore structure of the DCM. For a given number of wetting-drying cycles, the higher the initial water content, the higher the stabilized θ. At a given s value, θ decreased as the number of wetting-drying cycles increased, which suggests that cyclic wetting-drying reduces the water-holding capacity of DCM. The Gardner model for DCM was constructed considering initial water content and cyclic wetting-drying, and was effective at describing and predicting the SWCC model for DCM.
4
Zhang, Yuwei, Zhanping Song, Xiaolin Weng e Yongli Xie. "A New Soil-Water Characteristic Curve Model for Unsaturated Loess Based on Wetting-Induced Pore Deformation". Geofluids 2019 (15 aprile 2019): 1–14. http://dx.doi.org/10.1155/2019/1672418.
Testo completoAbstract (sommario):
The soil-water characteristic curve (SWCC) is the basis for describing seepage, strength, and constitutive model of unsaturated soil. The existing SWCC models do not work accurately for evaluating loess, because they do not consider the pore deformation that is induced by wetting. The present study develops a new SWCC model for unsaturated loess. The model considers the effect of wetting-induced pore deformation (WIPD) on the SWCC. The new model includes 6 parameters, which could be confirmed by laboratory tests. The pore volume function (PVF) was described by the WIPD. The shift factor ξ1i and the compression factor ξ2i were introduced into the model. The relationship between the void ratio e and ξ1i and ξ2i was established using the average pore radius. The new SWCC model for saturated loess was improved based on the classical van Genuchten (V-G) model. If the WIPD had not been considered, the new model would regress into the classical V-G model. SWCC tests of unsaturated loess with different void ratios were carried out to verify the new model. The model parameters were calibrated in the original state, and the SWCCs of different void ratios were predicted by the new model and found to be in good agreement with the test results.
5
Li, Xuebo, Tianlun Shen, Ke Xiang, Qian Zhai, Harianto Rahardjo, Alfrendo Satyanaga e Shijun Wang. "Effect of the Wetting Hydraulic Property of Soil on 1-D Water Infiltration". Sustainability 15, n. 3 (18 gennaio 2023): 1822. http://dx.doi.org/10.3390/su15031822.
Testo completoAbstract (sommario):
Rainwater infiltration is primarily governed by the soil-water characteristic curve (SWCC) and hydraulic conductivity function (HCF) of soil. Both the SWCC and the HCF are hysteretic during the drying and wetting processes. In a numerical simulation, different seepage results can be obtained by incorporating different hydraulic conductivity functions of soil. In practice, the wetting HCF is commonly estimated from the wetting SWCC using the statistical method, which is named HCFswcc,w in this note. However, there is no study that has verified the results from seepage analyses using HCFswcc,w. Therefore, the objective of this study is to investigate the influence of wetting SWCC and wetting HCF on 1-D water infiltration. The results from the numerical simulations were verified with the instrumentation reading from a soil column. It was observed that the results from the model using wetting HCFPSDF, which defines the wetting HCF estimated using the concept of pore-size distribution function, gave better agreement with the instrumented data. Therefore, both wetting SWCC and wetting HCFPSDF are advised to be used as input information for the numerical simulation of rainwater infiltration.
6
Li, J. H., L. M. Zhang e X. Li. "Soil-water characteristic curve and permeability function for unsaturated cracked soil". Canadian Geotechnical Journal 48, n. 7 (luglio 2011): 1010–31. http://dx.doi.org/10.1139/t11-027.
Testo completoAbstract (sommario):
Cracks are widely present in natural and engineered soils. As water infiltration into a cracked soil often starts from unsaturated conditions, the soil-water characteristic curve (SWCC) and permeability function for the cracked soil are required when conducting seepage analysis. This paper presents a method to predict the SWCC and permeability function for cracked soil considering crack volume changes during drying–wetting processes. The cracked soil is viewed as an overlapping continuum of a crack network system and a soil matrix system. The pore-size distributions for the two pore systems at a particular state can be determined and used to estimate the SWCCs and permeability functions. The estimated SWCCs and permeability functions for the two pore systems can be combined to give the SWCC and the permeability function for the cracked soil at that state. Then, the SWCC and permeability function for the cracked soil at different states along a crack development path can be obtained and combined to give the SWCC or permeability function for the cracked soil considering crack volume changes. Examples are presented to illustrate the prediction of the SWCCs and permeability functions for a cracked soil along five crack development paths.
7
Fredlund, Delwyn G., Daichao Sheng e Jidong Zhao. "Estimation of soil suction from the soil-water characteristic curve". Canadian Geotechnical Journal 48, n. 2 (febbraio 2011): 186–98. http://dx.doi.org/10.1139/t10-060.
Testo completoAbstract (sommario):
Soil-water characteristic curves (SWCCs) are routinely used for the estimation of unsaturated soil property functions (e.g., permeability functions, water storage functions, shear strength functions, and thermal property functions). This paper examines the possibility of using the SWCC for the estimation of in situ soil suction. The paper focuses on the limitations of estimating soil suctions from the SWCC and also suggests a context under which soil suction estimations should be used. The potential range of estimated suction values is known to be large because of hysteresis between drying and wetting SWCCs. For this, and other reasons, the estimation of in situ suctions from the SWCC has been discouraged. However, a framework is suggested in this paper for estimating the median value for in situ soil suction along with a likely range of soil suction values (i.e., maximum and minimum values). The percentage error in the estimation of soil suction from the SWCC is shown to be lowest for sand soils and highest for clay soils.
8
Al-Mahbashi, Ahmed M., Tamer Elkady e Mosleh Al-Shamrani. "The Role of Stress States on the Hysteric Behavior of Expansive Soil under Multiple Drying-Wetting Cycles". Buildings 13, n. 7 (26 giugno 2023): 1619. http://dx.doi.org/10.3390/buildings13071619.
Testo completoAbstract (sommario):
Expansive soils in the field are typically exposed to cyclic wetting and drying due to climatic fluctuations and subjected to a variety of stress conditions in nature or when used as compacted layers for the construction of hydraulic barriers or waste disposal facilities. The hysteric behavior of the soil-water characteristic curve (SWCC) is a key parameter for understanding, modeling, and interpreting the unsaturated behavior of these soils under such conditions. This study investigates the effect of stress states on the hysteresis behavior of soil-water characteristic curves (SWCCs) for compacted highly expansive clay over a range of matric suction between 0 and 1500 kPa. Two test series were performed, the first test series investigated the effect of stress states on the hysteresis of SWCCs during a single drying-wetting (DW) cycle. The second test series studied the combined effect of stress applied and multiple drying-wetting cycles on the SWCC hysteresis. For the sake of comparison, the overall SWCC hysteresis due to drying-wetting cycles was quantified using the average degree of hysteresis in terms of volumetric water content (ADHθ). Furthermore, contributors to the observed hysteresis were defined using two newly proposed measures; namely, average degree hysteresis in terms of gravimetric water content (ADHw) and in terms of volume change (ADHe*). The outcomes of this study indicate that consideration of stress states on the hysteresis of SWCC for expansive clay is of great importance. The results show a dual trend for the variation of ADHθ with applied vertical stress. Furthermore, multiple DW cycles induced a significant reduction in the hysteresis (ADHθ) under low- and high-stress states up to a certain level of DW cycles, then, no further changes in the hysteresis trend were detected. It was also found that hysteresis loops under a low-stress state were concentric in shape while hysteresis loops for specimens under a high-stress state were non-concentric, with a downward shift in hysteresis loops with the increase in DW cycles.
9
Kong, Lingwei, Hossain Md Sayem e Huihui Tian. "Influence of drying–wetting cycles on soil-water characteristic curve of undisturbed granite residual soils and microstructure mechanism by nuclear magnetic resonance (NMR) spin-spin relaxation time (T2) relaxometry". Canadian Geotechnical Journal 55, n. 2 (febbraio 2018): 208–16. http://dx.doi.org/10.1139/cgj-2016-0614.
Testo completoAbstract (sommario):
Due to the formational environment and climatic variability, granite residual soils with grain-size distribution ranging from gravel to clay undergo multiple drying–wetting cycles. The influences of multiple drying–wetting cycles on the soil-water characteristic curve (SWCC) and pore-size distribution (POSD) of undisturbed granite residual soils are investigated using the pressure plate test and nuclear magnetic resonance (NMR) spin-spin relaxation time (T2) distribution measurement, respectively. Results show that the water-retention capacity and air-entry value decrease and pores become more uniform with increasing drying–wetting cycles. After four drying–wetting cycles, the soil reaches a nearly constant state. The POSD change of multiple drying–wetting cycle samples is consistent with the SWCC of the soils. Furthermore, a modified van Genuchten model in terms of cumulative pore volume is used to obtain the best-fit POSD of the drying–wetting cycle samples. The shape and changing tendency of both curves of SWCC and POSD are quite similar and achieved a better correlation. It can be concluded that the SWCC is strongly dependent on the POSD of the soil and NMR T2 relaxometry can be used as an alternative to the assessment of microstructural variation of residual soils subjected to the periodic drying and wetting process.
10
Ahmed, Asif, Md Jobair Bin Alam, Pratibha Pandey e MD Sahadat Hossain. "Estimation of unsaturated flow parameters and hysteresis curve from field instrumentation". MATEC Web of Conferences 337 (2021): 01008. http://dx.doi.org/10.1051/matecconf/202133701008.
Testo completoAbstract (sommario):
Abstract: The negative pore water pressure or soil suction has significant effect on the performance of geotechnical infrastructures (e.g., slope, pavement, embankment etc.). The unsaturated behavior of soil is not static, rather offers variation in response to climatic loading. The objective of the study was to evaluate field-based techniques of SWCC construction in terms of capturing these variation as compared to laboratory methods and predictive models. The field assessment could allow the quantification of hysteresis effect on the SWCC. Instrumentation data from one Texas, USA highway was used in this study. Soil Water Characteristic Curves (SWCCs) were regenerated utilizing co-located moisture and suction data from the field. Laboratory and field measured SWCCs from the instrumented site were fitted by van Genuchten model. Previously developed predicted models were also utilized to evaluate the SWCC parameters. Based on the evapotranspiration and rainfall amounts, distinct drying and wetting cycles were recorded. Though hourly data was collected in this study, average daily values were used for the analysis. Unsaturated flow parameters (α, n, m) were determined from both laboratory testing and field moisture-suction data along with the predictive models. Clear differences were observed between the values obtained from predictive models and field generated SWCC. The outcome from this study revealed that field reconstructed SWCCs can be used to simulate higher precision in numerical modeling in numerous geotechnical applications.
Tesi sul tema "WETTING SWCC"
1
AHMED, AATIF. "EXPERIMENTAL STUDY ON WETTING SOIL WATER CHARACTERISTIC CURVE OF SAND WITH MIXTURE OF BENTONITE CLAY". Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18888.
Testo completoAbstract (sommario):
Soil-water characteristic curve (SWCC) also known as water retention curve is an
integral part of unsaturated soil mechanics. SWCC is a constitutive relation in
unsaturated soil mechanics where soil suction is related to water content. Wetting
SWCCs were determined for different sand-bentonite clay mixtures. With the help of
the Van-Genuchten equation, acquired test data were fitted. Wetting SWCC can be
related to flow of water through unsaturated zones of soil from the groundwater table to
the ground surface. Negative column test was employed to determine SWCC since it is
fairly simple and simulates the actual field conditions. In the present paper, different soil
samples, where sand is mixed with varying proportions of bentonite clay are considered,
for determining wetting SWCC. Finer the soil particle, higher will be the soil suction for
a given water content. Hence, as the content of clay increases, SWCC slightly shifts
towards the right, indicating the increment in soil suction. In turn, water entry
value(WEV) also shoots up.
2
Li, Po-Ting, e 李柏廷. "Measurement of Drying and Wetting SWCCs by Flow Pump Method". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9234pn.
Testo completoAbstract (sommario):
碩士國立臺灣大學
土木工程學研究所
106
In general, geotechnical engineers use soil mechanics which pioneered by Karl Terzaghi to solve various kinds of geotechnical engineering problems. The assumption of the soil is either completely saturated or completely dry in this theory. However, there are many area is in unsaturated condition and many geotechnical engineering problems occurs in unsaturated condition. Therefore, understanding the unsaturated soil mechanics could prevent the improper design happen. The soil-water characteristic curve (SWCC) play an important role in unsaturated soil mechanics. The SWCC represent the relationship between soil suction and soil water content. There are many methods and laboratory tests have been developed to evaluate and measure the SWCC over past decades. Among them, ASTM pressure plate test is widely used since its convenience and reliability. However, the experimental duration is too long about 1~3 months to obtain a SWCC and the specimen is stable or not is difficult to determine. In this study, flow pump system, triaxial system, 3D printing technology, axis translation technique and modified suction drop method are combined to establish an experimental system of SWCC measurement method. Fine quartz sand, Vietnam quartz sand and Peng Hu calcareous sand are used as test material for this research. Results show that this experimental method is able to obtain the SWCC efficiently and cost less experimental duration.
Capitoli di libri sul tema "WETTING SWCC"
1
Raghuram, Ammavajjala Sesha Sai, e B. Munwar Basha. "Effect of Drying and Wetting SWCCs on Unsaturated Soil Slopes". In Lecture Notes in Civil Engineering, 493–504. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6370-0_44.
Testo completo
2
Rojas, Eduardo. "Collapse Upon Wetting". In Towards a Unified Soil Mechanics Theory: The Use of Effective Stresses in Unsaturated Soils (Third Edition), 147–70. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815050356122010012.
Testo completoAbstract (sommario):
This chapter presents the modeling of the phenomenon of collapse upon wetting using the effective stress approach established in Chapter 2 and the elastoplastic framework for the volumetric behavior of soils proposed in the previous chapter. Using the probabilistic porous-solid model, Bishop’s parameter can be obtained to determine the current effective stress. The proposed framework includes the hysteresis of the SWRC and, to some extent, the hydro-mechanical coupling of unsaturated soils. This model is able to reproduce some particularities of the phenomenon of collapse upon wetting that other models cannot simulate.