相交双裂隙岩石损伤断裂特征  

Damage and fracture characteristics of rock containing cross cracks

作　　者：王国艳[1] 于广明[1] 袁长丰 WANG Guoyan;YU Guangming;YUAN Changfeng(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《中国矿业》2021年第2期214-218,共5页China Mining Magazine

基　　金：山东省自然科学基金资助(编号:ZR2017MEE017);山东省重点研发计划(公益类专项)资助(编号:2018GSF120005)。

摘　　要：为了探求相交双裂隙岩石损伤断裂特征,采用岩石破裂过程RFPA数值分析系统对不同角度的单裂隙、中点相交的等长双裂隙岩石在单轴压缩、单轴拉伸作用下的破坏过程进行数值模拟。结果表明:双裂隙试件除共轭裂隙之外,在压缩条件下首先在高角度裂隙两端产生扩展裂隙,拉伸作用下试件的断裂方向由低角度裂隙决定;当试件中的裂隙角为60°和75°时,压缩峰值强度随另一条裂隙倾角的增加单调递增;试件内部应力最大值的演化在加载初期随加载步的增加线性增长,压缩条件下最大主应力最大值增长最快,拉伸条件下,剪应力最大值增长最快。The damage-fractured process of rock containing a single crack or double cracks under uniaxial compression and uniaxial tension is simulated using numerical test of rock failure RFPA for studying damage and fracture characteristics of rock containing cross cracks.The results show that the extended fractures are produced in the first at both ends of crack which angle is high under uniaxial compression.Fracture direction of specimen with double cracks is determined by crack angle in addition to the specimens containing conjugated cracks under uniaxial tension.The compression peak strength increases monotonically with another crack angle increasing when crack angle is 60°or 75°.The stress values in rock increase linearly with loading step increasing in the early stage of loading according to the stress images of different loading steps.The maximum value of maximum principal stress increases most rapidly under uniaxial compression.The maximum value of shear stress increases most rapidly under uniaxial tension.

关 键 词：单轴压缩 单轴拉伸 峰值强度 双裂隙 裂隙扩展 应力分布 

分 类 号：TD313[矿业工程—矿井建设]