文章摘要
史旦达,王威,薛剑峰,邵伟.压-剪复合应力下非球形颗粒材料空心圆柱剪切试验的离散元模拟[J].水利学报,2019,50(9):1052-1062
压-剪复合应力下非球形颗粒材料空心圆柱剪切试验的离散元模拟
EM modelling of hollow cylinder shear test on granular materials under combined compression-shear stress using non-spherical particles
投稿时间:2019-05-08  
DOI:10.13243/j.cnki.slxb.20190319
中文关键词: 压-剪复合应力  空心圆柱剪切  颗粒形状  围压  离散单元法
英文关键词: combined compression-shear stress  hollow cylinder shear  particle shape  confining stress  discrete element method
基金项目:国家自然科学基金项目(41772273,51609315);上海市科委"科技创新行动计划"地方院校能力建设项目(19040501800);四川大学水力学与山区河流开发保护国家重点实验室开放基金(SKHL1704)
作者单位
史旦达 上海海事大学 海洋科学与工程学院, 上海 201306
四川大学 水力学与山区河流开发保护国家重点实验室, 四川 成都 610065 
王威 上海海事大学 海洋科学与工程学院, 上海 201306 
薛剑峰 新南威尔士大学 工程与信息学院, 堪培拉 澳大利亚 2612
四川大学 水力学与山区河流开发保护国家重点实验室, 四川 成都 610065 
邵伟 上海海事大学 海洋科学与工程学院, 上海 201306 
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中文摘要:
      采用离散元模拟平台PFC3D构建空心圆柱型数值试样,分析了压-剪复合应力条件下非球形颗粒材料数值试样的宏细观力学响应,重点探讨了颗粒形状和围压对数值试样初始变形模量、抗剪强度、剪切带倾角和组构各向异性演化的影响。结果表明:在保持大主应力方向角α=30°不变的单调剪切条件下,数值试样的初始变形模量能够反映实际砂土的压硬性规律,也即初始变形模量随着围压的增大而增大。数值试样的峰值内摩擦角随着颗粒长短轴比Se的增大而增大,且随着围压的增大而减小。数值试样的剪切带倾角在16°~25°范围内,且随着Se的增大,剪切带倾角越大。无论接触法向初始各向异性分布如何,随着剪切荷载的施加,接触法向各向异性的主方向均逐渐接近大主应力方向,也即试样发现明显的应力诱发各向异性,且在低围压下这一规律更为显著。
英文摘要:
      In this study,hollow cylindrical specimens were prepared on a discrete element commercial platform PFC3D using non-spherical particles. Both macro-and micro-mechanical behaviors of granular materials under combined compression-shear stress condition were comprehensively examined, with emphasis on the effects of particle shape and confining stress on initial deformation modulus, shear resistance, inclination of shear band and the evolution of fabric anisotropy of the numerical samples. The results show that under monotonic shear loading, with the major principal stress direction fixed at 30°, the numerical samples can well reflect the compression hardening behavior of laboratory sand samples,i.e. the initial deformation modulus of the sample gradually increases as confining stress increases. The peak internal friction angle of the numerical sample increases with aspect ratio (Se) of the particles,but decreases with the increase of confining stress. The inclination angle of shear band of the numerical sample ranges between 16°~25°. It is also found that the inclination angle of shear band increases with particle shape index Se. Irrespective of the initial direction of contact normal anisotropy,the orientation of contact normal anisotropy of the sample gradually closes to the direction of major principal stress under shear loading,which means the notable stress-induced anisotropy of the sample,and this phenomenon is more significant under low confining stress.
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