裂隙倾角与密度对深部岩体岩爆倾向性影响的数值模拟研究

工程岩体是由节理、裂隙等结构组成的不连续介质体,深部巷道处于高地压、强扰动的复杂工程环境中,裂隙岩体的岩爆倾向性是深部工程安全稳定性研究的重要课题。本文以矿井深部巷道为研究对象,构建裂隙岩体模型;利用数值模拟手段通过单轴压缩试验,分析不同裂隙产状岩体的能量、强度特征。试验结果表明:裂隙弱化了岩体的力学参数,裂隙倾角和裂隙密度是影响岩体强度和岩爆倾向性的重要指标;裂隙倾角越大,岩体所存储的弹性应变能越高,岩体岩爆的可能性越大;裂隙密度对裂隙岩体弹性应变能的大小影响较小,裂隙岩体的岩爆倾向性主要受裂隙倾角的影响。研究成果对为深部工程裂隙岩体岩爆预测提供了科学的依据。

Numerical simulation of the influence of fracture dip angle and density on the rockburst tendency in the deep mine

The engineering rock mass is a discontinuous medium body composed of joints, cracks and other structures. The deep roadway is in a complex engineering environment with high ground pressure and strong disturbance. The rockburst tendency of the fractured rock mass is an important subject for the safety and stability research of the deep engineering.By means of numerical simulation, the energy and strength characteristics of rock masses with different fracture occurrence are analyzed through uniaxial compression test. The test results show that the fracture weakens the mechanical parameters of rock masses, and the fracture dip Angle and fracture density are important indicators affecting the strength and bursting liability of rock masses.The larger the fracture dip Angle is, the higher the elastic strain energy stored by the rock mass is, and the greater the possibility of rock burst is.The fracture density has little effect on the elastic strain energy of the fractured rock mass, and the bursting liability of the fractured rock mass is mainly affected by the fracture dip Angle.The research results provide a scientific basis for the rock burst prediction of deep engineering fractured rock mass.