铁道科学与工程学报2017，Vol.14Issue(10)：2072-2081,10.
岩石细观特征对其宏观力学行为的影响
Influence of the rock meso-characteristics on macro mechanical behavior
摘要
Abstract
This paper adopted particle flow numerical analysis method to simulate sandstone rock mechanical behavior under the condition of uniaxial and conventional triaxial compression. The triaxial compressive strength was obtained, and cohesionc and internal friction angleφ were calculated according to the Mohr-Coulomb criterion. The impact of particle mesoscopic parameters (particle stiffness ration, parallel bond stiffness ratio, particle Young's modulus, parallel bond Young's modulus, particle friction coefficient) on the shear strength and the uniaixal compressive strength was discussed. The results show that: 1) numerical simulated uniaixal compressive strength and theoretical value are roughly the same as the trends of mesoscopic parameters change, but numerical simulated uniaixal compressive strength is less than the theoretical value. 2) Peak axial stresses is greatly affected by parallel bond Young's modulus and particle friction coefficient. 3) Particle friction coefficient is logarithmically related to the internal friction angle of material, and it is greatly influenced by particle and parallel bond stiffness ratio. 4) Parallel bond Young's modulus has a greater impact on cohesions than other mesoscopic parameters. Both particle stiffness ration and particle Young's modulus have a positive correlation with cohesions, however parallel bond stiffness ratio, parallel bond Young's modulus and particle friction coefficient have a negative correlation with cohesions.关键词
细观参数/颗粒流模拟/剪切强度参数/抗压强度Key words
mesoscopic parameters/particle flow simulation/shear strength parameters/compressive strength分类
建筑与水利引用本文复制引用
何娟,林杭,李江腾..岩石细观特征对其宏观力学行为的影响[J].铁道科学与工程学报,2017,14(10):2072-2081,10.基金项目
国家自然科学基金资助项目(51474249, 51374246) （51474249, 51374246）
河南省瓦斯地质与瓦斯治理重点实验室开放基金项目(WS2013A01) （WS2013A01）
