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在分析水介质耦合装药结构特点的基础上,根据爆破动力学原理,应用弹性理论和波动理论推导了正入射情况下孔壁岩面上的冲击压力、应力波衰减规律。为了解水耦合装药爆破对岩石的破坏过程,采用有限元软件ANSYS-LSDANA对工程实例进行了数值模拟,并采用数值模拟中的爆破参数进行了现场试验。结果表明:水介质的耦合作用不仅有利于炮孔底部岩石破碎,而且加快了施工进度、改善了施工环境,达到安全增效、降耗的目的。该方法可为其他隧道爆破提供参考,具有重要的推广和应用价值。
Based on the analysis of the structural characteristics of the coupled charge of aqueous media and the attenuation principle of impact pressure and stress wave on the surface of rock mass under normal incidence, the theory of blasting dynamics and elastic theory and wave theory are deduced. In order to understand the destruction process of rock by water-coupled charge blasting, the finite element software ANSYS-LSDANA was used to simulate the engineering example. Field experiments were carried out by using the blasting parameters in numerical simulation. The results show that the coupling of water medium is not only beneficial to rock crushing at the bottom of blasting hole, but also accelerating the construction progress, improving the construction environment, achieving the goal of safety, efficiency and reducing consumption. The method can provide reference for other tunnel blasting and has important promotion and application value.