岩土力学Issue(z2)：456-463,8.
不同粗糙度的节理直剪颗粒流分析
Particle flow analysis of direct shear tests on joints with different roughnesses
摘要
Abstract
A model of joints with five different roughnesses has been built successfully by using the particle flow code(PFC) in two-dimensions;and a series of numerical simulation direct shear tests which under 5 different constant loads have been done. We can observe the morphology damage and crack evolution mechanism of five different roughnesses joints under different constant loads from the viewpoint of mesomechanics. At the same time, the influence of JRC value and particle friction coefficient of joint on the joint shear strength is analyzed. And a joint plane shear strength parameters and relations with JRC values are back analyzed. Detailed results are as follows:normal constant load larger is, the greater the peak shear stress of joints is, the smaller the dilatancy phenomenon is, the greater the range of joints morphology injury is. With the development of shear, the surface contact area of the upper and lower joints reduced;microcracks produced along the joint surface. As the shear displacement continues to increase, the number of microcracks increase significantly, and not limited to the vicinity of the joint plane;but to enter inside the model. The peak shear stress of joints increases with the increase of joint roughness (JRC value) and the particle frictional coefficient of the joints. Joint shear strength parameters Cj andjj increase with the increase of the JRC value. The results can provide reference and basis for the indoor tests and engineering applications.关键词
粗糙度/直剪/裂纹/细观/抗剪强度Key words
roughness/direct shear/cracks/mesomechanics/shear strength分类
建筑与水利引用本文复制引用
曹日红,曹平,林杭,张科,谭希文..不同粗糙度的节理直剪颗粒流分析[J].岩土力学,2013,(z2):456-463,8.基金项目
国家自然科学基金资助项目（No.51174228）；国家自然科学基金资助项目（No.51274249）；中南大学中央高校基本科研业务费专项资金资助项目（No.2013zzts257）；湖南省研究生培养创新基地基金（No.713600001）。 （）
