Numerical simulation of electroosmosis in unsaturated compacted clay  

作　　者：KangWei Tang Feng Zhang DeCheng Feng GuanFu Wang 

机构地区：[1]School of Transportation Science and Engineering,Harbin Institute of Technology,73 Huanghe Road,Harbin,Heilongjiang 150090,China

出　　处：《Research in Cold and Arid Regions》2021年第5期394-407,共14页寒旱区科学（英文版）

基　　金：the financial support from the National Key Research and Development Program of China(No.2018YFC1505306);the National Natural Science Foundation of China(No.41971076).

摘　　要：The moisture content of a road subgrade in cold regions will increase after freeze-thaw cycles,resulting in subgrade strength and stiffness losses.Electroosmosis is widely used in treating saturated soft soils to decrease the moisture content.The induced moisture migration during electroosmosis in unsaturated soil is much more complex than that of saturated soil because of a series of nonlinear changes in soil properties.This study first uses an exponential function to characterize the relationship between electroosmotic permeability and saturation degree.Then,a one-dimensional model is developed to simulate the electroosmosis-induced moisture migration in unsaturated soil.Simulation results show that electroosmosis reduces the saturation degree of the unsaturated soil,indicating that it can be applied to subgrade dewatering.Key parameters such as soil pore size distribution coefficient,air entry value,and effective voltage significantly affect moisture migration.Electroosmotic properties of unsaturated soils are extremely important to the efficiency of electroosmosis.

关 键 词：ELECTRO-OSMOSIS unsaturated clay moisture migration numerical simulation 

分 类 号：U416.1[交通运输工程—道路与铁道工程]