颗粒长短轴比对饱和砂土液化影响的离散元分析  

DEM Study on Effect of Particle Long-short-axes Ratio on Liquefaction of Saturated Sand

作　　者：张昭 魏星[1] 王刚[2] ZHANG Zhao;WEI Xing;WANG Gang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]重庆大学土木工程学院,重庆400045

出　　处：《路基工程》2018年第5期40-44,共5页Subgrade Engineering

基　　金：国家自然科学基金(41602286)

摘　　要：运用基于离散元方法的颗粒流软件(PFC)进行了不同长短轴比颗粒组成的饱和砂土试样在不排水条件下的循环剪切试验模拟,研究了颗粒长短轴比对砂土液化的影响。结果表明:颗粒长短轴比通过影响砂土试样的接触数量,进而影响砂土的抗液化强度与液化前后应变幅值,并且这种影响具有区间效应,长短轴比值为1. 6时颗粒接触数量最大,抗液化强度最高,剪应变幅值最小。The numerical simulation of circulated shear test with saturated sand sample,which made of different long-short-axes ratio soil particles under undrained condition,was conducted by PFC based on DEM method.And the way used to observe the impact on sand liquefaction by different long-short-axes ratio soil particles is studied.The results indicated that,the sand strength of anti-liquefaction and strain amplitude before and after liquefaction was indirectly influenced by different long-short-axes ratio soil particles through contact quantity of sand sample.In addition,the impact had interval effect.When the long-short-axes ratio of soil particle is 1.6,the contact number of particle is the maximum,the sand strength of anti-liquefaction is the highest and the shearing strain amplitude is the lowest.

关 键 词：颗粒流方法 长短轴比 砂土液化 配位数 液化后大变形 

分 类 号：TU195.22[建筑科学—建筑理论]