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隧道在开挖过程中形成的围岩松动圈,隧道地震预报TSP技术的数据采集是在隧道围岩中进行的,因此必须考虑围岩松动圈对TSP采集的影响,采用波场快照与时间记录相结合的方法,本文研究了松动圈对不同组合的震源和检波器生成地震波场的影响,并对每种组合的时间记录进行了处理,对比了数值模型与处理提取到的反射界面位置,若检波器或者震源全部或者其中之一埋设在松动圈内,会使得提取到的反射界面相对于模型设置有延后的现象出现,最后通过对工程实例的处理分析,验证了数值模拟所得结论.
Therefore, it is necessary to consider the influence of loose ring of surrounding rock on TSP acquisition. Wavefield snapshots and time records should be taken into account. In this paper, the influence of the loose ring on the seismic wave fields generated by different combinations of sources and receivers is studied. The time records of each combination are processed, and the numerical results are compared with those of the reflection interface All or one of the geophone or the seismic source is embedded in the loose ring, which causes the delayed reflection phenomenon of the extracted reflective interface relative to the model. Finally, the conclusion of the numerical simulation is verified through the processing and analysis of the engineering example.