Hydraulic and volume change behaviors of compacted highly expansive soil under cyclic wetting and drying  

作　　者：Mohamed Farid Abbas Abdullah Ali Shaker Mosleh A.Al-Shamrani 

机构地区：[1]Civil Engineering Department,College of Engineering,Prince Sattam bin Abdulaziz University,Al Kharj,Saudi Arabia [2]Soil Mechanics and Geotechnical Engineering Research Institute,Housing and Building National Research Center(HBRC),Giza,Egypt [3]Bugshan Research Chair in Expansive Soils,Civil Engineering Department,College of Engineering,King Saud University,Riyadh,Saudi Arabia

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2023年第2期486-499,共14页岩石力学与岩土工程学报（英文版）

摘　　要：The wide engineered application of compacted expansive soils necessitates understanding their behavior under field conditions.The results of this study demonstrate how seasonal climatic variation and stress and boundary conditions individually or collectively influence the hydraulic and volume change behavior of compacted highly expansive soils.The cyclic wetting and drying(CWD)process was applied for two boundary conditions,i.e.constant stress(CS)and constant volume(CV),and for a wide range of axial stress states.The adopted CWD process affected the hydraulic and volume change behaviors of expansive soils,with the first cycle of wetting and drying being the most effective.The CWD process under CS conditions resulted in shrinkage accumulation and reduction in saturated hydraulic conductivity(k sat).On the other hand,CWD under CV conditions caused a reduction of swell pressure while has almost no impact on k sat.An elastic response to CWD was achieved after the third cycle for saturated hydraulic conductivity(k sat),the third to fourth cycle for the volume change potential under the CV conditions,and the fourth to fifth cycle for the volume change potential under the CS conditions.Finally,both swell pressure(s s)and saturated hydraulic conductivity(k sat)are not fundamental parameters of the expansive soil but rather depend on stress,boundary and wetting conditions.

关 键 词：Expansive soils Hydraulic conductivity Volume change potential Cyclic wetting and drying(CWD) Swell pressure 

分 类 号：TU43[建筑科学—岩土工程]