| Numerical Simulation of Moisture Movement in Unsaturated Expansive Soil Slope Suffering Permeation |
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| 作者姓名： | Chen Shanxiong* School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan China Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China Yu Song Liu Zhiguo Xu Haibin Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China |
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| 作者单位： | Chen Shanxiong* School of Civil Engineering and Mechanics，Huazhong University of Science and Technology，Wuhan 430074，China; Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan 430071，China Yu Song Liu Zhiguo Xu Haibin Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan 430071，China |
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| 基金项目： | 中国科学院资助项目，the Open Project of Hubei Key Laboratory of Geo-environmental Engineering |
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| 摘 要： | INTRODUCTION Theinfiltrationandevaporationofwaterinasoil slopeareofparamountimportanceindetermining slopestability.Previousengineeringcasesandstud ieshaveshownthatrainwaterisoftenamajorfactor intheslopefailureofexpansivesoils.Expansivesoils intropicalandsubtropicalzonesareoftenunsaturat ed,andsoilslopesareinastablestateinnormalcli mateconditionsbecauseofthehighsuctionandshear strengthofthesoilmass.However,oncepermeation happensrainwaterwillinfiltrateintothesoilmasswhichleadstoanincreasein…
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Numerical Simulation of Moisture Movement in Unsaturated Expansive Soil Slope Suffering Permeation |
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| Chen Shanxiong* School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan ,China, Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan ,China Yu Song Liu Zhiguo Xu Haibin Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan ,China.Numerical Simulation of Moisture Movement in Unsaturated Expansive Soil Slope Suffering Permeation[J].Journal of China University of Geosciences,2005,16(4). |
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| Authors: | Chen Shanxiong Yu Song Liu Zhiguo Xu Haibin |
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| Abstract: | This study develops a way of analyzing moisture movement in unsaturated expansive soil slope. The basic equations and the integrated finite difference method for moisture movement in unsaturated soils are briefly described, and the calculation code MFUS2 has been developed. The moisture movements in unsaturated expansive soil slopes suffering precipitation were simulated numerically. The simulation results show that expansion or contraction must be taken into account in an analysis model. A simplified equivalent model for calculating rainwater infiltration into expansive soil slopes has been developed. The simplified equivalent model divides the soil slope into two layers according to the extent of weathering of the soil mass at depth. Layer Ⅰ is intensively weathered and moisture can be fully evaporated or rapidly absorbed. The moisture movement parameters take into account the greater soil permeability caused by fissures. Layer Ⅱ is unweathered and the soil is basically undisturbed. The moisture movement parameters of homogeneous soils are applicable. The moisture movements in unsaturated expansive soil slopes suffering precipitation were simulated numerically using the simplified equivalent model. The simulation results show that the moisture movement in the expansive soil slope under rainfall permeation mainly takes place in the extensively weathered layer Ⅰ, which closely simulates the real situation. |
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| Keywords: | expansive soils unsaturated soil slope infiltration transient distribution of water content |
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