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地震波法隧道超前地质预报中采用炸药激发地震波不仅工序繁琐、破坏性大,也存在着较大的安全隐患,而且在一些弱围岩地带的应用受到一定的限制。为了从根本上解决这一问题,使得地震波法地质超前预报技术更加简单便捷,趋于完善,采用机械能激发地震波的无损方式代替炸药爆破,并对激发点和接收点布置方式进行了优化和调整,通过有限元波场数值模拟分析发现,用机械能方式激发的地震波纵横波特征明显,遇到不良地质体后反射波能够在第一时间到达检波器,并通过现场试验验证了将这种新的地震波激发方式和激发点、接收点布置方式用于隧道地质超前预报是合理有效的。
It is not only cumbersome and destructive to apply explosives to stimulate seismic waves in advance geological prediction of seismic wave method tunnels, but also has great potential safety hazard, and its application in some weak surrounding rock areas is limited. In order to solve this problem fundamentally, the advanced geological prediction technology by seismic wave method is more simple and convenient, and tends to be perfect. The non-destructive method using mechanical energy to excite seismic wave instead of explosive blasting is adopted, and the arrangement of excitation point and receiving point is optimized and adjusted. Through the numerical simulation of the finite element wavefield, it is found that the characteristics of the seismic waves propagating by mechanical energy are obvious, and the reflected waves can reach the detector at the first time after encountering the bad geological body. The field test verifies that the new seismic wave It is reasonable and valid to use excitation mode and excitation point and reception point arrangement mode for tunnel geological prediction.