Evaluation of the coefficient of lateral stress at rest of granular materials under repetitive loading conditions  

作　　者：Heerym Han Hyunwook Choo Junghee Park 

机构地区：[1]Department of Civil and Environmental Engineering,Hanyang University,Seoul,04763,South Korea [2]Department of Civil and Environmental Engineering,Incheon National University,Incheon,22012,South Korea

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第5期1709-1721,共13页岩石力学与岩土工程学报（英文版）

基　　金：supported by the National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT)(Grant No.RS-2023-00208844).

摘　　要：Although the internal stress state of soils can be affected by repetitive loading,there are few studies evaluating the lateral stress(or K_(0))of soils under repetitive loading.This study investigates the changes in K_(0) and directional shear wave velocity(V_(s))in samples of two granular materials with different particle shapes during repetitive loading.A modified oedometer cell equipped with bender elements and a diaphragm transducer was developed to measure the variations in the lateral stress and the shear wave velocity,under repetitive loading on the loading and unloading paths.The study produced the following results:(1)Repetitive loading on the loading path resulted in an increase in the K_(0) of test samples as a function of cyclic loading number(i),and(2)Repetitive loading on the unloading path resulted in a decrease in K_(0) according to i.The shear wave velocity ratio(i.e.V_(s)(HH)/V_(s)(VH),where the first and second letters in parentheses corresponds to the directions of wave propagation and particle motion,respectively,and V and H corresponds to the vertical and horizontal directions,respectively)according to i supports the experimental observations of this study.However,when the tested material was in lightly over-consolidated state,there was an increase in K_(0) during repetitive loading,indicating that it was the initial K_(0),rather than the loading path,which is responsible for the change in K_(0).The power model can capture the variation in the K_(0) of samples according to i.Notably,the K_(0)=1 line acts as the boundary between the increase and decrease in K_(0) under repetitive loading.

关 键 词：Coefficient of lateral stress at rest Repetitive loading Granular materials Shear wave velocity Stiffness anisotropy 

分 类 号：TU443[建筑科学—岩土工程]