不同地应力下爆炸应力波在节理岩体中传播规律模型试验研究

 通过模型试验研究不同地应力下应力波在节理岩体中的传播规律，同时考虑节理数量的影响，并推导地应力作用下应力波在多条非线性节理处的传播方程。首先，通过导爆索产生爆炸应力波，监测不同位置的应力，研究地应力下节理岩体中应力波传播的衰减组成，并分析地应力以及节理数量对应力波衰减的影响，其次，考虑地应力对非线性节理模型的影响，结合时间递归分析法，得出地应力作用下应力波在多条非线性节理处的传播方程，并将计算结果与试验数据进行对比分析。研究结果表明，高地应力下，爆炸应力波在节理岩体中传播时，其衰减主要由岩石材料和节理两部分分别引起的衰减叠加组成，随着地应力增加，节理岩体对应力波的衰减增强，其中岩石材料对应力波的衰减作用加强，而节理引起的衰减减弱。

Model test on propagation of blasting stress wave in jointed rock mass under different in-situ stresses

The propagation of stress wave in jointed rock under different in-situ stresses was studied through model test considering the influence of the joint number. An equation of wave propagation across multiple joints under in-situ stresses was established. The blasting stress wave was generated by the detonating cord，and the stress was monitored at different positions. The composition of wave attenuation induced by the jointed rock was studied under in-situ stresses，and the influence of confining pressure and joint number on the wave attenuation was analyzed. Considering the influence of in-situ stresses on nonlinear joint model，the equation of stress wave in multiple nonlinear deformation joints under in-situ stress was derived based on the method of time domain recursive analysis. The results show that the wave attenuation in the jointed rock is induced by the combined effect of the rock material and the joints. With the increasing of the in-situ stresses，the attenuation of explosive wave in the jointed rock is enhanced，in which the wave attenuation induced by rock material is strengthened and the attenuation caused by joints is reduced.