含水裂纹在爆破扰动下的断裂机制  

Fracture mechanism of water cracks under blasting disturbance

作　　者：王聪聪[1,2] 韩雪靖[1,2] 黄慎 张永勤 WANG Cong-cong;HAN Xue-jing;HUANG Shen;ZHANG Yong-qin(Institute for Explosive Technology,Fuzhou University,Fuzhou 350116,China;Zijin Mining Collage,Fuzhou University,Fuzhou 350116,China;Lanzhou Petrochemical Polytechnic,Lanzhou 730060,China)

机构地区：[1]福州大学爆炸技术研究所,福州350116 [2]福州大学紫金矿业学院,福州350116 [3]兰州石化职业技术学院,兰州730060

出　　处：《工程爆破》2018年第1期13-19,共7页Engineering Blasting

基　　金：国家自然科学基金资助项目(41072232)

摘　　要：为探究地应力影响下含水裂纹在爆破扰动下的断裂机制,运用断裂力学原理建立了爆破扰动下深部岩体含水裂纹扩展的力学模型,通过定义等效爆破扰动荷载推导出了岩体动静耦合强度因子的计算表达式;同时,通过对拉剪型和压剪型裂纹断裂的分析,了解到爆破扰动、水压力、地应力、裂纹倾角等因素对裂纹断裂的影响方式,获得了裂纹断裂的广义断裂准则,并进行实例运算,结果表明:在拉剪型断裂中,地应力对其相同方向裂纹的断裂起促进作用;在压剪型断裂中,不同侧应力系数下裂纹最易发生断裂的角度与岩体的内摩擦系数有关;爆破扰动荷载相当于增大了裂纹水的压力。In order to investigate the fracture mechanism of water-bearing cracks under blasting disturbance under the influence of geostress,the mechanical model of water-bearing crack propagation in deep rock mass under blasting disturbance is established by using the theory of fracture mechanics,and the expression of the dynamic and static coupling strength factor of rock mass is deduced by defining the equivalent blasting disturbance.At the same time,the influence of blasting disturbance,water pressure,ground stress and crack angle on crack fracture is studied by analyzing the fracture of shear and shear fracture,and the generalized fracture criterion of crack fracture is obtained.The results of the example show that in the tensile shear fracture,the geostress plays a positive role in accelerating cracks at the same direction.In the compressive shear fracture,the angle of the crack under different stress coefficients is related to the internal friction coefficient of the rock mass.Additionally,the blasting disturbance is equivalent to increasing the pressure of crack water.

关 键 词：动静耦合 应力强度因子 等效爆破扰动荷载 广义断裂准则 

分 类 号：TD235.2[矿业工程—矿井建设] X932[环境科学与工程—安全科学]