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对某巷道围岩爆破工程进行数值模拟来分析爆破地震波在围岩中的传播规律,通过数值模拟分析结果与解析解进行对比,发现两者得出的结论类似。在爆破地震波的影响下围岩质点的峰值速度变化呈一定规律,对不同径向距离和轴向距离条件下质点峰值速度的变化规律进行比较,可以发现围岩中质点的峰值速度随着径向距离呈现正负号交互的波浪式衰减,即围岩可能出现交替拉压状态以及分区破裂现象,而质点峰值速度随着轴向距离的变化相对简单,主要表现为非线性的快速衰减。
Numerical simulation of surrounding rock blasting in a roadway to analyze the propagation of blasting seismic waves in the surrounding rock is carried out. The numerical simulation results are compared with the analytical solutions and the conclusion is similar. Under the influence of blasting seismic wave, the change of the peak velocity of the surrounding rock mass is a certain rule. The variation of the peak velocity of the mass particle under different radial and axial distances is compared. It can be found that the peak velocity of the mass particle in the surrounding rock changes with the radial Wave decay with positive and negative sign of interaction, that is, alternating tension and compression of surrounding rock and the phenomenon of zonal disintegration may occur. However, the variation of peak velocity with axial distance is relatively simple, which is mainly manifested as the nonlinear fast decay.