裂隙倾角对岩石破坏形态影响的数值模拟  

Numerical Simulation on Influence of Fracture Dip Angle on Rock Failure Mode

作　　者：赵桐德 高全臣[1] 王纪伟 路景淦 ZHAO Tong-de;GAO Quan-chen;WANG Ji-wei;LU Jing-gan(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《煤炭技术》2020年第8期1-3,共3页Coal Technology

基　　金：中央高校基本科研业务费专项资金(2010YL01)。

摘　　要：采用离散元数值分析软件PFC2D对含不同裂隙角度的岩石在单轴压缩下的扩展规律及力学特性进行数值模拟研究。结果表明:不同裂隙角度对裂隙在岩石中的扩展及破坏有较大影响;裂隙在尖端处起裂,当裂隙角度较小时,在扩展过程中裂隙周围应力分布比较均匀,裂隙沿平行于加载方向扩展至试样破坏;当裂隙角度较大时,裂隙扩展受应力分布影响较大,次生裂隙较多,主要沿裂隙角度方向扩展;根据裂隙倾角对峰值强度和劣化系数的影响曲线,通过拟合分别得到峰值强度和劣化系数与裂隙倾角间呈指数函数关系。The discrete element numerical analysis software PFC2 Dwas used to simulate the propagation law and mechanical properties of rock with different fracture dip angles under uniaxial compression.The results show that different fracture dip angles have a great influence on the expansion and failure of fractures in rocks. The fracture starts to crack at the tip. When the angle of the fracture is small, the stress distribution around the crack is relatively uniform during the expansion process, and the crack extends parallel to the loading direction to the sample damage. When the fracture angle is large, the fracture propagation is greatly affected by the stress distribution, and the secondary fractures are more,mainly extending along the angle of the fracture. According to the influence curve of fracture dip angle on peak strength and deterioration coefficient, the exponential relationship between peak strength and deterioration coefficient and fracture dip angle is obtained by fitting.

关 键 词：裂隙角度 单轴压缩 破坏形态 峰值强度 数值模拟 

分 类 号：TD315[矿业工程—矿井建设]