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Factors Predisposing and Triggering the Phenomenon of Shrinkage-Swelling of Clay soils in the Urban Center of Diamniadio

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Geomaterials 2023年第2期13卷 23-34页

作者： Khadim Faye Fatou Samb Pape Sanou Faye Yves Berthaud Laboratoire de Mécanique et Modélisation UFR Sciences de l’Ingénieur UIDT Thiès Sénégal UFR Sciences et Technologies Université Iba Der Thiam de Thiès Thiès Sénégal

The phenomena of shrinkage and swelling of clay induce damage to housing structures every year. Precipitation, climatic changes and drought are the cause of wall cracks due to subsidence or swelling of the supporting soil. This movement alters the balance between the soil and the structures. To explain this defection, the soil is made up of three elements: the solid, the liquid and the gas. Sometimes in a natural way or following a human intervention, one of these elements undergoes an abnormal variation that causes the loss of the balance between land and works. It is in this sense that this article deals on the one hand with the factors of predisposition and triggering of the phenomena of shrinkage-swelling of the clay soils of Diamniadio and on the other hand, the factors of aggravation linked to the lithological heterogeneity and the variation in the thickness of the layers susceptible to shrinkage-swelling. The studies carried out have enabled a deeper understanding of the behavior of expansive soils following their interactions with climate, vegetation, hydrology, hydrogeology, constructions among others, but also the influence of lateral and vertical variations of fine soil facies.

关键词： Swelling Clays expansive soil Shrinkage-Swelling Desiccation Cracks Diamniadio

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Microscopic Simulation of expansive soils and Evolution Laws

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Fluid Dynamics & Materials Processing 2020年第6期16卷 152-161页

作者： Lin Pan Jinhong Xia Hongxing Han School of Civil Engineering and Architecture Xinxiang UniversityXinxiang453003China

In this paper,the discrete element method(DEM)is used to study the microstructure of expansive soils.The results of the numerical calculations are in agreement with the stress-strain triaxial test curve that is obtained for a representative expansive soil.Biaxial compression tests are conducted for different confining pressures(50 kpa,100 kpa,and 150 kpa).Attention is paid to the following aspects:deviatoric stress,boundary energy,friction energy,bond energy,strain energy,kinetic energy,and the contact force between grains when the test specimen is strained and to the effect of the different confining pressures on the internal crack expansion.The results of this research show that the cross-section of the specimen is destroyed along the middle part of the specimen itself.When the confining pressure is higher,the impulse is stronger,and this leads to more effective destruction.

关键词： expansive soil particle flow parallel-bond crack

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Study and Comparison of Swelling and Compressibility Characteristics of Crumb Marl, Flaky Marl with Attapulgite and Sandy Clay from the Diamniadio Urban Pole at the Oedometer

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Geomaterials 2023年第3期13卷 61-70页

作者： Khadim Faye Fatou Samb Yves Berthaud Pape Sanou Faye Laboratoire de Mécanique et Modélisation UFR Sciences de l'Ingénieur UIDT Thiès Sénégal UFR Sciences et Technologies Université Iba Der Thiam de Thiès Sénégal

In Senegal, the Diamniadio, Sebikhotane and Bargny sector contains clay soils that are problematic for construction. In order to have more information on the behavior of the clay soils of Diamniadio, free swelling tests followed by load-discharge cycles were carried out according to standard NF P 94-090-1. These tests were carried out using an Oedometric device on the three samples from the study site (sandy clays with calcareous concretion, marls with crumbs and laminated marls with attapulgite) to apprehend their swelling aspects in saturated conditions. For the free swelling test, a determination of the different swelling phases will be carried out followed by a comparison of the rate of evolution of the phases for the three samples from the site. In the same vein, the compressibility characteristics of the samples will also be provided from load-unload Oedometric tests. Thereafter, we proceed to a comparison of the void index at the initial state of the samples after two charge-discharge cycles and the influence of the cycles on the reorganization of the internal structure of the samples. These studies will provide more information on the swelling behavior of Diamniadio soils in the presence of water.

关键词： Clay Swelling expansive soil Evolution of The Swelling Compressibility Coefficient Charge-Discharge Cycle

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Stabilization Mechanism of Calcium Lignosulphonate Used in Expansion Sensitive soil

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Journal of Wuhan University of Technology(Materials Science) 2020年第5期35卷 847-855页

作者：吴大江佘伟 WEI Luansu ZUO Wenqiang HU Xiangyu HONG Jinxiang MIAO Changwen Jiangsu Key Laboratory fo r Construction Materials Southeast UniversityNanjing 211189China Sobute New Materials Co.Ltd Nanjing 211103China

A series of tests were performed to investigate the macroscopic properties and the stabilization mechanism of calcium lignosulphonate modified expansive soil.Compared with natural soil,soil modified by 4%calcium lignosulphonate showed 56.5%increased 28 days unconfined compressive strength and 23.8%decreased free expansion rate.The X-ray diffraction analysis results indicate the existence of cation exchange and the reduction of montmorillonite interplanar spacing.The X-computed tomography results demonstrate that calcium lignosulphonate decreased the porosity and optimized the pore distribution.The calcium lignosulphonate also increased the stability of the suspension system according to the Zeta potential results.Moreover,the results of rheological tests show that the moderate amount of calcium lignosulphonate enhanced the yield stress and the plastic viscosity,proving the formation of a strong connection between soil particles.

关键词： calcium lignosulphonate expansive soil mechanical characteristic stabilization mechanism

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Suction variations and soil fabric of swelling compacted soils

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Journal of Rock Mechanics and Geotechnical Engineering 2010年第2期2卷 129-134页

作者： H.Nowamooz F.Masrouri Laboratoire Environnement Géomécanique & OuvragesNancy Université Laboratoire de Génie de la Conception INSA de Strasbourg

This study addresses firstly the soil fabric variations of loose and dense compacted soil samples during a single wetting/drying cycle at suctions between 0 and 287.9 MPa using mainly the mercury intrusion porosimetry（MIP） tests.Two suction techniques were employed to apply this wide suction range：the osmotic technique for suctions less than 8.5 MPa,and the vapor equilibrium or salt solution technique for suctions higher than 8.5 MPa.Secondly,the soil water retention curves（SWRCs） were predicted by the MIP test results for both loose and dense soil samples.A reasonable correspondence between MIP results and SWRCs was found on the wetting path at lower suctions close to saturation and on drying path at higher suctions.

关键词： expansive soil experimentation modelling drying/wetting cycle

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Centrifugal Model Tests on Railway Embankments of expansive soils

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Journal of Modern Transportation 1999年第1期16卷 65-72页

作者：王鹰 School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China

Based on the centrifugal model tests on railway embankments of expansive soil in Nanning Kunming railway,the author studied several embankments under different physical conditions. The stress and strain states and settlement of the embankments were analyzed, and the obtained results can be used as a reference to field construction.

关键词： Centrifuge model tests expansive soil railway embankment

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