初始应力对应力波传播及块体运动规律影响研究

 借助理论模型和试验测试结果分析初始应力对岩石弹性波速的影响，运用数值模拟手段对比研究爆炸扰动作用下不同初始应力时的应力波形状，包括质点应力、位移和速度，得到初始应力对应力波传播影响的一般规律。建立构造块体在爆炸扰动下的运动模型，通过对模型的计算和分析，研究不同初始应力下单个块体的相对位移。研究结果表明：(1) 在低初始应力下，岩石中的弹性波速随压力增大而迅速增大，增大的梯度在低应力下较高，在高应力下趋于一常数值；(2) 当初始应力增大时，相同距离处的峰值径向应力和峰值位移会降低，而且衰减较快，波形变窄；(3) 块体间的相对位移与初始应力的大小成反比。

Study on EFFECTs OF INITIAL STRESS ON STRESS WAVE PROPAGATION AND BLOCK MOVEMENT LAW

The effect of initial stress on velocity of wave propagation in rock is analyzed by theoretic models and test results. The shapes of stress wave including particle stress,displacement and velocity with different initial stresses under the condition of explosion disturbances are studied by method of numerical simulation,and the basic law of initial stress effect on wave propagation is obtained. The movement model of structural block under the effect of explosion is built. The relative displacement of single block with different initial stresses is studied through increasing calculating and analyzing the numerical model. The results show that:(1) the velocity of wave propagation in rock increases rapidly under low initial stress,and tends to be constant under high initial stress;(2) the radial stress and displacement at the same distance will decrease with increasing of initial stress rapidly,and the wave shape will become narrow;and (3) the relative displacement of single block has inverse ratio to the value of initial stress.