单剪试验试样应力状态与破坏模式  

Stress state and failure mode of simple shear tests

作　　者：李尧[1] 李嘉评 韩宽 LI Yao;LI Jiaping;HAN Kuan(School of Highway,Chang'an University,Xi'an 710064,Shannxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《山东大学学报（工学版）》2022年第4期201-209,共9页Journal of Shandong University（Engineering Science）

基　　金：国家自然科学基金资助项目(51708040,52078045);陕西省高校科协青年人才托举计划资助项目(20200410);英国工程和物理科学研究理事会资助项目(EP/L015463/1)。

摘　　要：基于挪威岩土工程研究所(Norwegian Geotechnical Institute,NGI)研发的单剪仪及其试验,建立NGI型单剪试验离散元模型,研究试样的应力状态与破坏模式。结果表明,试样的破坏面既不在水平面也不在垂直面,破坏时最大剪应力在水平面附近;随着试样孔隙比的减小,垂直平面会先于水平平面破坏,且试验结果分析中使用的常数k与其模拟值的偏差减小。本研究提出确定单剪试验破坏面位置的理论计算方法,发现常数k取值方法存在局限性,应结合单剪试验离散元模拟分析单剪试验的应力状态与破坏模式。Based on the NGI type simple shear apparatus developed by Norwegian Geotechnical Institute(NGI) and tests it perform discrete element simulations for NGI type simple shear tests were built,and the stress state and failure mode of specimens were studied.The results showed that the failure plane was neither in horizontal plane nor in vertical plane,the maximum shear stress was near the horizontal plane at failure.With the decreasing void ratio,vertical plane failed first followed by the failure on horizontal plane,and the differences of k value used in analyzing the test results between experiments and discrete element simulations were decreased.An analytical calculation method for determining the location of the failure plane was proposed.There was a limitation in determining the k value,the analysis of stress state and failure mode of simple shear tests should be combined with discrete element simulation analysis.

关 键 词：离散元模拟 单剪试验 应力状态 砂土 莫尔应力圆 破坏面 

分 类 号：TU43[建筑科学—岩土工程]