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Gotowe bibliografie tematyczne / Wetting-induced collapse

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Gotowa bibliografia na temat „Wetting-induced collapse”

Autor: Grafiati

Data publikacji: 24 maja 2025

Data aktualizacji: 30 maja 2025

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Artykuły w czasopismach na temat "Wetting-induced collapse"

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Ng, C. W. W., Q. Cheng i C. Zhou. "Thermal effects on yielding and wetting-induced collapse of recompacted and intact loess". Canadian Geotechnical Journal 55, nr 8 (sierpień 2018): 1095–103. http://dx.doi.org/10.1139/cgj-2017-0332.

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Yielding and wetting-induced collapse are two important interrelated aspects of unsaturated loess behaviour. Previous studies on loess were generally conducted under a single temperature condition. The principal objective of this study is to investigate thermal effects on yielding and wetting-induced collapse of recompacted and intact loess. Isotropic compression tests were carried out to determine yield stress at different suctions (0 and 100 kPa) and temperatures (5, 23, and 50 °C). Moreover, wetting tests were conducted at various temperatures and stresses. Results of the wetting tests were interpreted using the measured yield stress at various suctions and temperatures. It is found that yield stress decreases with decreasing suction (wetting-induced softening). The wetting-induced softening of recompacted loess is more significant at a higher temperature. The observed thermal effects on wetting-induced softening are likely because with decreasing suction, the stabilizing interparticle normal force decreases more at a higher temperature. In contrast, when the applied stress reaches the yield stress during wetting, yielding and plastic volumetric contraction can be observed. More importantly, wetting-induced contraction of recompacted loess at 50 °C is about three times of that at 5 °C. The larger contraction at 50 °C is mainly because the wetting-induced softening is larger at a higher temperature.

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Jiang, Mingjing, Haijun Hu i Fang Liu. "Summary of collapsible behaviour of artificially structured loess in oedometer and triaxial wetting tests". Canadian Geotechnical Journal 49, nr 10 (październik 2012): 1147–57. http://dx.doi.org/10.1139/t2012-075.

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This paper summarizes experimental studies on wetting-induced collapsibility in loess using single-oedometer, double-oedometer, and triaxial wetting tests. Artificially structural loess samples with interparticle bonding calcite (CaCO3) and a large void ratio were tested in the laboratory to avoid sampling disturbance of natural loess. The comparison between the single- and double-oedometer tests confirms that the wetting-induced deformation is independent of the sequence of wetting and loading. The conventional triaxial apparatus was enhanced for investigating the collapse deformation in response to different water content increments when subjected to different stress levels. The wetting-induced strain subjected to high confining pressure develops in two steps. It increases with increasing water content and reaches a relatively stable plateau, and then increases rapidly again until a final stable state is reached. The initial collapse surface was found by plotting the wetting-induced strain vectors observed in triaxial wetting tests. The wetting-induced strain is negligible when a specimen is wetted at a stress point inside this surface, while it becomes significant when wetted beyond this surface.

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Vrancken, Nandi, Guy Vereecke, Stef Bal, Stefanie Sergeant, Geert Doumen, Frank Holsteyns, Herman Terryn, Stefan de Gendt i Xiu Mei Xu. "Pattern Collapse of High-Aspect-Ratio Silicon Nanostructures - A Parametric Study". Solid State Phenomena 255 (wrzesień 2016): 136–40. http://dx.doi.org/10.4028/www.scientific.net/ssp.255.136.

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This work focuses on capillary-induced collapse of high-aspect-ratio silicon nanopillars. Modification of the surface chemistry is demonstrated to be an efficient approach for reducing capillary forces and consequently reduce pattern collapse. Special effort is spent on determination of the wetting state of chemically modified surfaces as complete structure wetting is of utmost importance in wet processing. In light of this, an ATR-FTIR based method has been developed to unambiguously distinguish between wetting and non-wetting states.

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Capobianco, Vittoria, Leonardo Cascini, Sabatino Cuomo i Vito Foresta. "Wetting-induced collapse behaviour of a natural and vegetated coarse pyroclastic soil". E3S Web of Conferences 195 (2020): 03025. http://dx.doi.org/10.1051/e3sconf/202019503025.

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Unsaturated pyroclastic soils originated by Vesuvius volcano show a collapsible behaviour upon wetting with a significant reduction in volume and rearrangement of solid skeleton. The paper investigates the role played by vegetation on wetting-induced collapse behaviour (namely, collapsibility) of reconstituted unsaturated soil specimens through two series of wetting tests in a standard oedometer. The first series of tests was performed on bare soil specimens, as to resemble the site conditions. The second group of tests was conducted on the same soil previously vegetated for 20 weeks with perennial graminae species, which are frequently used as a nature-based solution for contrasting surface erosion along slopes in different geo-environmental contexts. First, an initial small vertical net stress was applied on partially saturated specimens having similar initial saturation degree, then collapse was induced by flooding the specimens with distilled water and final vertical displacements were measured. As main outcome, soil porosity is highly reduced by the growth of grass roots. Consequently, the potential wetting collapse in the rooted soils is inhibited by low values of porosity. For similar initial soil porosity, in both bare and vegetated specimens (after root growth), a further reduction of the volumetric collapse magnitude is observed.

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Kamei, Takeshi, i Masao Enomoto. "Wetting-Induced Collapse Behaviour of Compacted Silty Soil." Doboku Gakkai Ronbunshu, nr 505 (1994): 97–103. http://dx.doi.org/10.2208/jscej.1994.505_97.

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Lawton, Evert C., Richard J. Fragaszy i Mark D. Hetherington. "Review of Wetting‐Induced Collapse in Compacted Soil". Journal of Geotechnical Engineering 118, nr 9 (wrzesień 1992): 1376–94. http://dx.doi.org/10.1061/(asce)0733-9410(1992)118:9(1376).

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Fu, Zhong Zhi, Si Hong Liu i Wei Xing Gu. "Evaluating the Wetting Induced Deformation of Rockfill Dams Using a Hypoplastic Constitutive Model". Advanced Materials Research 243-249 (maj 2011): 4564–68. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.4564.

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Evaluating the wetting induced deformation of the shell is one of the most important issues in designing a high rockfill dam. Excessive wetting deformation and the relevant stress deterioration in adjacent impervious structures may cumber the normal operation of the engineering and seriously risk the safety of the dam. In this paper, a hypoplastic creep model is incorporated into a finite element procedure to study the wetting induced deformation of a rockfill dam. Considerable lateral movement towards the upstream and an additional wetting collapse presented in the upstream shell induced by reservoir impounding is effectively predicted by the finite element model. The reasonable results confirm the feasibility of applying the hypoplastic model to the evaluation of the wetting induced deformation in dam engineering.

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Liu, Qiqi, Wanli Xie, Hui Yang, Kangze Yuan, Siyu Zhang, Xinyu Li, Pengxin Qu, Zhiyi Wu, Jiahao Zhou i Xuanyu Gao. "Intrinsic Mechanisms of Differences in Wetting-Induced Deformation of Soils on Chinese Loess Plateau: Insights into Land Stability and Sustainable Management". Land 14, nr 2 (3.02.2025): 312. https://doi.org/10.3390/land14020312.

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Wetting-induced soil deformation significantly impacts land stability and management on the Chinese Loess Plateau. This study analyzed silt soils from the Late Pleistocene (1 m depth) and Middle Pleistocene (25 m depth) to investigate compression and collapsible deformation during wetting. The compression in both soils progressed through three stages: slow deformation under low pressure, accelerated deformation under moderate pressure, and decelerated deformation under high pressure. Wetting intensified the compression in the 1 m sample but reduced it in the 25 m sample, with the deformation becoming more sensitive to the initial water content under higher pressures. Collapse tests showed contrasting behaviors: the 1 m sample exhibited collapsibility, while the 25 m sample displayed expansiveness (a negative collapsibility coefficient). Microstructural analysis revealed that the 1 m sample with abundant macropores and overhead structures had a lower structural stability than the 25 sample with more stable, rounded micropores. The wetting-induced deformation was governed by the balance between clay mineral expansion and structural collapse, with collapsibility prevailing when collapse dominated and expansiveness prevailing when expansion was predominant. These findings provide valuable insights into soil–water interactions and support improved land use and management strategies in the loess region.

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Choudhury, Chinumani, i Tadikonda Venkata Bharat. "Wetting-induced collapse behavior of kaolinite: influence of fabric and inundation pressure". Canadian Geotechnical Journal 55, nr 7 (lipiec 2018): 956–67. http://dx.doi.org/10.1139/cgj-2017-0297.

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Collapsible soils are known to withstand high normal stresses without undergoing a significant volume change in an air-dry state. The soil is, however, susceptible to a large volume change upon wetting. The volumetric collapse behavior of these soils is of great engineering interest to address the problem of ground subsidence. Kaolinite was found to be a collapsible soil similar to the loess soil. The collapse mechanism in kaolinite was due to changes in particle association (fabric) with the interaction with different pore fluids. Several physicochemical parameters strongly influenced the particle association by altering the charges on the particle surfaces and edges. The collapse nature of the kaolinite was investigated with great detail in this work. Wetting-induced collapse behavior of kaolinite was studied under the influence of pore-fluid chemistry using a multi-scale approach. The influence of pH, salt concentration, and dielectric pore-fluid environment on the clay behavior was analyzed using sedimentation and collapse tests. The collapse test results were well corroborated with the sedimentation test data, scanning electron microscopy images of lyophilized specimens, and edge isoelectric point (IEPedge). The influence of inundation fluid and inundation pressure on the fabric changes and collapse potential was elucidated. The collapse potential was found to depend on the inundation pressure and pore-fluid characteristics. Maximum collapse potential was observed to be due to water inundation and minimum due to inundation with kerosene. The mechanical pressure at higher inundation pressures helped to bring the clay platelets into better face–face association during the inundation.

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THOREL, L., V. FERBER, B. CAICEDO i I. M. KHOKHAR. "Physical modelling of wetting-induced collapse in embankment base". Géotechnique 61, nr 5 (maj 2011): 409–20. http://dx.doi.org/10.1680/geot.10.p.029.

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Rozprawy doktorskie na temat "Wetting-induced collapse"

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Xu, Jia. "Investigation of spatially graded distribution of pore fluid effect on wetting-induced soil collapse /". View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202008%20XU.

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Fatahizadeh, Marieh. "Modelling of soil collapse induced by water infiltration : implications for foundation stability". Electronic Thesis or Diss., Strasbourg, 2025. http://www.theses.fr/2025STRAD003.

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Cette thèse étudie le mécanisme d'effondrement et son effet sur le tassement des fondations en appliquant des cadres numériques et analytiques. La méthode analytique a utilisé les propriétés géotechniques de base pour développer un modèle prédictif du potentiel d'effondrement. Le modèle hydromécanique a été développé au sein du modèle numérique, qui évalue plusieurs scénarios tels que la montée de la nappe phréatique, l'infiltration (unilatérale et bilatérale) et l'évaporation avant infiltration. Le degré initial de saturation est identifié comme le principal paramètre affectant l'effondrement du sol. Le modèle proposé pour prédire le potentiel d'effondrement a démontré de meilleures performances que les autres modèles. Les résultats du modèle hydromécanique ont montré que l'infiltration d'eau et la montée de la nappe phréatique réduisent la succion dans la zone non saturée et déclenchent l'effondrement. Le schéma d'infiltration s'avère critique, car l'infiltration unilatérale peut provoquer un mouillage localisé et un tassement différentiel. En revanche, l'infiltration bilatérale conduit à un tassement uniforme. Le modèle hydromécanique a la capacité de prévoir le tassement des fondations sous l'effet du changement climatique
This thesis investigates the collapse mechanism and its effect on foundation settlement by implementing numerical and analytical frameworks. The analytical method employed basic geotechnical properties to develop a predictive model for the collapse potential. The hydromechanical model was developed within the numerical model, which evaluates multiple scenarios such as rising water table, infiltration (one-sided and two-sided), and evaporation prior to infiltration. Initial degree of saturation is identified as the primary parameter affecting the soil collapse. The proposed model for predicting collapse potential demonstrated better performance than other model. The results of the hydromechanical model showed that water infiltration and rising water table reduce the suction in the unsaturated zone and trigger collapse. The infiltration pattern is found to be critical as one-sided infiltration can cause localized wetting and uneven settlement. In contrast, two-sided infiltration leads to a balanced settlement. the hydromechanical model shows potential for evaluating foundations settlement under climate change effect

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Książki na temat "Wetting-induced collapse"

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Lawton, Evert C. Wetting-induced collapse in compacted soil. 1986.

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Części książek na temat "Wetting-induced collapse"

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"Centrifuge modelling of wetting-induced collapse in embankment base". W Advances in Unsaturated Soils, 195–202. CRC Press, 2013. http://dx.doi.org/10.1201/b14393-22.

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Rabbi, A., D. Cameron i M. Rahman. "Role of matric suction on wetting-induced collapse settlement of silty sand". W Unsaturated Soils: Research & Applications, 129–35. CRC Press, 2014. http://dx.doi.org/10.1201/b17034-17.

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Haeri S. Mohsen, Saberi Saeed, Beigi Majid i Akbari Garakani Amir. "Study on the Behavior of a Collapsible Soil under Constant Matric Suction Loading Implementing an Unsaturated Framework". W From Fundamentals to Applications in Geotechnics. IOS Press, 2015. https://doi.org/10.3233/978-1-61499-603-3-2109.

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Collapsible soils such as loess are usually found in arid and semi-arid regions. Catastrophic failure of residential building foundations due to wetting collapse is among problems associated with loessial deposits. This behavior is generally attributed to their open, unstable soil fabric and their weak inter-particle bonding forces, which together yield a void structured soil that is susceptible to collapse. In this study, one of the possible mechanisms of pore collapse (pore collapse induced by an increase in net confining stresses under constant matric suction, such as what occurs when a new structure is constructed on top of a collapsible soil deposit) is studied. In this regard, undisturbed unsaturated loessial soil samples have been obtained from the city of Gorgan, in Golestan province, Iran, and has been examined by implementing a full stress path controlled unsaturated triaxial apparatus at Sharif University of Technology that is modified to accommodate accurate unsaturated testing with automated continuous measurement of all required parameters. Based on the results of the tests, efforts are made to indicate the capability of a present constitutive model for unsaturated soils to predict the variation of yielding net confining pressure, and load-collapse curve (LC) for the examined collapsible soil. In this research, the present framework is modified to better predict the behavior of collapsible soils. The modification includes applying the effect of suction on the elastic constants. Applying the modified framework indicated a good agreement between the measured and predicted behavior of the tested collapsible soil.

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Streszczenia konferencji na temat "Wetting-induced collapse"

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Seiphoori, Ali, i Mostafa Zamanian. "Grouting Soil with Dilute Suspension of Clay Nanoparticles to Improve against Wetting-Induced Collapse". W Geo-Congress 2022. Reston, VA: American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484012.018.

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Rajasegar, Rajavasanth, i Ales Srna. "Effect of Spray Collapse on Mixture Preparation and Combustion Characteristics of a Spark-Ignition Heavy-Duty Diesel Optical Engine Fueled with Direct-Injected Liquefied Petroleum Gas (LPG)". W WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2023. http://dx.doi.org/10.4271/2023-01-0323.

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<div class="section abstract"><div class="htmlview paragraph">Liquefied Petroleum Gas (LPG), as a common alternative fuel for internal combustion engines is currently widespread in use for fleet vehicles. However, a current majority of the LPG-fueled engines, uses port-fuel injection that offers lower power density when compared to a gasoline engine of equivalent displacement volume. This is due to the lower molecular weight and higher volatility of LPG components that displaces more air in the intake charge due to the larger volume occupied by the gaseous fuel. LPG direct-injection during the closed-valve portion of the cycle can avoid displacement of intake air and can thereby help achieve comparable gasoline-engine power densities. However, under certain engine operating conditions, direct-injection sprays can collapse and lead to sub-optimal fuel-air mixing, wall-wetting, incomplete combustion, and increased pollutant emissions. Direct-injection LPG, owing to its thermo-physical properties is more prone to spray collapse than gasoline sprays. However, the impact of spray collapse for high-volatility LPG on mixture preparation and subsequent combustion is not fully understood. To this end, direct-injection, laser-spark ignition experiments using propane as a surrogate for LPG under lean and stoichiometric engine operating conditions were carried out in an optically accessible, single cylinder, heavy-duty, diesel engine. A quick-switching parallel propane and iso-octane fuel system allows for easy comparison between the two fuels. Fuel temperature, operating equivalence ratio and injection timing are varied for a parametric study. In addition to combustion characterization using conventional cylinder pressure measurements, optical diagnostics are employed. These include infrared (IR) imaging for quantifying fuel-air mixture homogeneity and high-speed natural luminosity imaging for tracking the spatial and temporal progression of combustion. Imaging of infrared emission from compression-heated fuel does not reveal any significant differences in the signal distribution between collapsing and non-collapsing sprays at the spark timing. Irrespective of coolant temperatures, early injection timing resulted in a homogeneous mixture that lead to repeatable flame evolution with minimal cycle-to-cycle variability for both LPG and iso-octane. However, late injection timing resulted in mixture inhomogeneity and non-isotropic turbulence distribution. Under lean operation with late injection timing, LPG combustion is shown to benefit from a more favorable mixture distribution and flow properties induced by spray collapse. On the other hand, identical operating conditions proved to be detrimental for iso-octane combustion most likely caused by distribution of lean mixtures near the spark location that negatively impact initial flame kernel growth leading to increased cycle-to-cycle variability.</div></div>

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