主动围压下岩石爆炸动态响应数值模拟

摘要

针对深部岩石在爆破作用下的失效机理和破坏过程,基于ANSYS/LSDYNA软件,在水平方向和竖直方向进行围压约束来模拟岩石受到的地应力作用.选取单向围压、等值双向围压和非等值双向围压对中心孔爆破下岩石动态响应进行研究.将数值模拟结果与模型实验结果对比,分析爆炸应力波的传播过程,并讨论了不同围压约束对爆炸后裂纹扩展的影响.结果表明,初始围压作用对爆炸应力波的传播影响较小;初始围压会抑制爆破裂纹扩张;竖直方向围压主要抑制水平方向裂纹扩张,水平方向围压主要抑制竖直方向裂纹扩张.%Aim at the failure mechanism and the failure process of deep rock under blasting,the rock ground stress is simulated by confining pressure in horizontal and vertical direction based on ANSYS/LSDYNA software.The dynamic response of the rock under the central hole blasting is studied by using the one-way confining pressure,the equivalent two-way confining pres-sure and the non-equivalent two-way confining pressure.Comparing the results of numerical simulation and results of model test,the propagation process of explosive stress wave is analyzed and the influence of crack propagation under different confi-ning pressure after blasting is discussed.The results shows that the initial confining pressure effect on the propagation of the explosive stress wave is small,the initial confining pressure inhibits blasting crack expansion,vertical confining pressure mainly inhibits the horizontal crack expansion and horizontal confining pressure mainly inhibits vertical crack expansion.