高应力回采巷道围岩破裂机理及危险性评价  

Study of rock fracture mechanisms and risk assessment in mining roadways located in highly stressed rock

作　　者：王连国[1] 侯化强[1] 孙建[1,2] 李宪伟[1] 王占盛[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]安徽理工大学能源与安全学院,安徽淮南232001

出　　处：《中国矿业大学学报》2012年第3期361-365,396,共6页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2010CB226805);国家自然科学基金项目(50874103);深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK0905)

摘　　要：用弹塑性力学中的复变函数方法求解了巷道围岩的应力函数,研究了高应力回采巷道围岩破裂机理,提出了用危险函数来评价巷道围岩破裂的危险性和确定滑移面分布特征的方法.结果表明:对一定特定内摩擦角(φ0)的巷道围岩,只有当q/C≥4.1156e0.0606φ0时,巷道围岩才会出现破裂区.当15°≤φ0≤23°时,围岩裂隙向巷道表面及深部两侧方向扩展而形成一定范围的破裂区;当23°<φ0≤60°时,围岩承载能力升高,围岩裂隙由巷道表面向巷道深部方向扩展.在工程实践中,此方法有效控制了围岩的变形.Plasto-elastic theory is used to solve the stress function in rock surrounding an under- ground roadway. Fracture mechanisms in highly stressed rock surrounding a mine roadway are discussed. The risk of rupture in the rock and the slip-plane distribution are determined by use of a hazard function. The results show that a fracture zone appears when q/C is greater than, or equal to, 4. 1156e^0.0606φ0 in the rock at an the internal friction angle φ0. Wall rock cracking extends on both sides, on the surface and deep in the rock, until the fracture zone forms for φ0 values between 15 and 23 degrees. Cracks extend only deep into the rock for φ0 values between 23 and 60 degrees because the carrying capacity of the rock increases. This method leads to ef- fective control of rock deformation in engineering practice.

关 键 词：高应力 回采巷道 破裂机理 危险系数 

分 类 号：TD353[矿业工程—矿井建设]