At-rest lateral earth pressure of compacted expansive soils:Experimental investigations and prediction approach  

作　　者：Zhong Han Pan Zhang Weilie Zou Kewei Fan Sai K.Vanapalli Lianglong Wan 

机构地区：[1]School of Civil Engineering,Wuhan University,Wuhan,China [2]Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education,Wuhan University,Wuhan,China [3]Department of Civil Engineering,University of Ottawa,Ottawa,Ontario,Canada [4]Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,China [5]Residence Engineering Management Station of Shenzhen Municipality,Shenzhen,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第4期1425-1435,共11页岩石力学与岩土工程学报（英文版）

基　　金：sponsored by the National Natural Science Foundation of China(Grant Nos.52378365 and 52179109);Jiangsu Province Excellent Postdoctoral Program(Grant No.2023);China Scholarship Council-University of Ottawa Joint Scholarship.

摘　　要：This paper presents experimental studies on a compacted expansive soil,from Nanyang,China for investigating the at-rest lateral earth pressureσL of expansive soils.The key studies include(i)relationships between theσL and the vertical stressσV during soaking and consolidation,(ii)the influences of initial dry densityρd0 and moisture content w 0 on the vertical and lateral swelling pressures at no swelling strain(i.e.σV0 andσL0),and(iii)evolution of theσL during five long-term wetting-drying cycles.Experimental results demonstrated that the post-soakingσL-σV relationships are piecewise linear and their slopes in the passive state(σL>σV)and active state(σL<σV)are similar to that of the consolidationσL-σV relationships in the normal-and over-consolidated states,respectively.The soakingσL-σV relationships converge to the consolidationσL-σV relationships at a thresholdσV where the interparticle swelling is restrained.TheσL0 andσV0 increase monotonically withρd0;however,they show increasing-then-decreasing trends with the w 0.The extent of compaction-induced swelling anisotropy,which is evaluated byσL0/σV0,reduces with an increase in the compaction energy and molding water content.TheσL reduces over moisture cycles and the stress relaxation in theσL during soaking is observed.An approach was developed to predict the at-rest soakingσL-σV relationships,which requires conventional consolidation and shear strength properties and one measurement of theσL-σV relationships during soaking.The proposed approach was validated using the results of three different expansive soils available in the literature.

关 键 词：Lateral earth pressure Expansive soil SOAKING Vertical stress Swelling pressure 

分 类 号：TU443[建筑科学—岩土工程]