层理面对水压爆破应力波传播规律的影响

水压爆破应力波的传播过程决定了爆破的作用效果及影响范围,层状岩体中的层理面特征对水压爆破应力波的传播路径及衰减具有直接影响.为明确水压爆破应力波在层状岩体内的传播规律及影响因素,采用理论分析和数值模拟相结合的方法,研究了层理面位置及其介质属性对水压爆破应力波传播的影响规律.结果表明:水压爆破相对于常规爆破产生的初始应力...

Infulence of bedding planes on stress wave propagation in hydraulic blasting

The propagation process of hydraulic blasting stress waves determines the effect and scope of blasting, and bedding plane features of layered rock mass have a direct influence on the propagation path and attenuation of hydraulic blasting stress wave. In order to clarify the propagation law and influencing factors of hydraulic blasting stress wave in the layered rock mass, the theoretical analysis combined with numerical simulation was used to study the influence law of the position and the medium of bedding on the propagation of hydraulic blasting stress wave. The results show that the initial pressure produced by hydraulic blasting is larger and the crushing effect is more obvious than those produced by conventional blasting. The stress wave of hydraulic blasting will reflect and transmit when it propagates to the bedding plane, which leads to the change of stress state of the rock in the area, and significant reduce of the peak value of incident stress near the area. The smaller the distance between the bedding plane and the explosion source, the more obvious the suppression effect on stress wave propagation and crack propagation. As the distance increases, the reflected stress waves promote the crack propagation between the bedding plane and the explosion source and induce the initial crack to continuously spread, and at the same time, the propagation direction of transverse crack is changed. The layered medium has a significant influence on the propagation of stress waves and the spread of cracks. The greater the performance difference between the bedding plane medium and the rock mass, the more serious the attenuation of the stress wave on the bedding plane, which reduces the effective action range of the stress wave.