A note on influence of stress anisotropy on the Poisson's ratio of dry sand

作     者：Huan He Mingnan Li Kostas Senetakis 

作者机构：University of New South Wales(UNSW)SydneyAustralia City University of Hong KongHong Kong Special Administrative Region 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2017年第9卷第6期

页      面：1159-1164页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：the financial support by the grant from the Research Grant Council of the Hong Kong Special Administrative Region(HKSAR) China Project No.9041880(City U112813) the start-up grant of the College of Science and Engineering,City University of Hong Kong(Code:7200533-ACE) 

主　　题：Bender elements Sand Poisson’s ratio 

摘      要：In this study, extender and bender element tests were conducted investigating the small-strain Poisson’s ratio of variable sands, with a focus on the effect of stress anisotropy in order to quantify the sensitivity of Poisson’s ratio to the applied deviatoric stress. Four different uniform sands were tested, including a biogenic sand, a crushed rock and two natural sands, covering a wide range of particle shapes. From these sands, eleven samples were prepared in the laboratory and were tested under variable stress paths,maintaining a constant mean effective pressure while increasing the deviatoric compressive load. Under the application of these given stress paths, the data analysis indicated that the sensitivity of Poisson’s ratio to the stress ratio was more pronounced for sands with irregularly shaped particles in comparison to sands with fairly rounded and spherical grains. For sands with very irregularly shaped particles, the increase of Poisson’s ratio from the isotropic to the anisotropic stress state reached 50%, while this increase for natural sands with fairly rounded particles was in the order of 20%.