岩土工程学报2012，Vol.34Issue(12)：2162-2169,8.
理想胶结砂土力学特性及剪切带形成的离散元分析
Mechanical behavior and shear band formation in idealized cemented sands by DEM
摘要
Abstract
Focus is placed on the mechanical behavior and shear band formation in idealized cemented sands by a series of DEM biaxial compression tests involving different bond strengths and confining pressures. The DEM software PFC2D is applied with user-defined contact model, which is resulted from the mechanical tests on the bonded granules idealized by two glued aluminum rods. The results show that the cemented sands have a higher strength and more significant post-peak softening and dilatancy than the reconstituted sands, and that the simulation is consistent with the laboratory tests and closely associated with the micro bonded contact mechanism. In addition, the shear bands in the cemented sands form with the simultaneous localization of micro parameters, such as deformed specimens, void ratio, averaged pure rotation rate (APR), displacement field and distribution of bond breakage.关键词
胶结砂土/胶结接触模型/剪切带/离散单元法Key words
cemented sand/bond contact model/shear band/distinct element method分类
建筑与水利引用本文复制引用
蒋明镜,张望城,孙渝刚,张伏光..理想胶结砂土力学特性及剪切带形成的离散元分析[J].岩土工程学报,2012,34(12):2162-2169,8.基金项目
国家杰出青年基金项目 （）
国家自然科学基金项目 （）
教育部博士点基金项目（20100072110048）：长江学者和创新团队发展计划项目 （）
