离散元微观参数对砂土宏观参数的影响  

Influence of the Micro Parameters of Discrete Element on the Macro Parameters of Sands

作　　者：申志福[1,2] 蒋明镜[1,2] 朱方园[1,2] 胡海军[1,2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《西北地震学报》2011年第B08期160-165,共6页Northwestern Seismological Journal

基　　金：国家自然科学基金(10972158);国家杰出青年科学基金(51025932)

摘　　要：采用离散元商业软件PFC2D对密砂和松砂试样共进行了66组双轴压缩试验,试验中改变颗粒接触刚度和粒间摩擦系数以探究离散元微观参数对试样宏观参数(弹性模量和内摩擦角)的影响,其中颗粒法向刚度变化范围为1.5×108～1.5×109N.m-1,粒间摩擦系数变化范围为0.1～0.7 N.m-1。结果表明:颗粒接触刚度对弹性模量有一定程度影响且对密样影响程度大于松样,而对内摩擦角基本无影响;粒间摩擦系数对试样弹性模量有明显影响且对松样的影响程度更大,对密样和松样的内摩擦角都有非常显著的影响。66 biaxial tests on dense and loose sands are performed using PFC2 D.In the tests the particle stiffness is changed between 1.5×10 8 ～1.5×10 9 N·m-1 and interparticle frictional coefficient are changed between 0.1～0.7 to investigate the relationship between micro-parameters and macro-parameters（Young＇s modulus and internal friction angle）.The results show that the normal stiffness has a certain degree of influence on Young＇s modulus,which is greater for dense sands than for loose sands,but very smaller on internal friction angle of the tested bulks;the frictional coefficient affects Young＇s modulus of both loose and dense sands but more obviously for loose sands,and its impact on internal friction angle is even more significant.

关 键 词：砂土 离散元 接触刚度 粒间摩擦系数 弹性模量 内摩擦角 双轴试验 

分 类 号：TU411.3[建筑科学—岩土工程]