Numerical Simulation and Application of TST Tunnel Geological Advanced Prediction
Fault, fractured zone and karst water body are unfavorable geological bodies in engineering construction, which is a serious threat to tunnel excavation.At present, the advanced geological prediction has been gradually recognized as a necessary step in the tunnel construction.Since the shooting and receiving terminals of data acquisition for advanced geological prediction are generally arranged in tunnels with narrow space, the geophone will receive reflected echoes from different directions in the whole space of the tunnel and the seismic wave field becomes very complex.Tunnel Seismic Tomography (TST) spatial array observation system and scanning method can obtain the velocity distribution of surrounding rock and geologic structural location in front of the tunnel face.Furthermore, its unique two-dimensional direction filtering method is able to effectively eliminate the influence of lateral reflection echo and improve the prediction accuracy under complex geological conditions.Based on TST method, fault fracture zone model which is common unfavorable geological units in tunnel geological prediction is set up to simulate seismic response with time-domain finite difference method in the homogeneous media.According to seismic record and snapshots of forward data, the propagation law of seismic waves under this model is studied.After the data processing by velocity analysis and seismic migration, the image of the model and seismic velocity distribution is obtained.Finally, TST technology is applied in Mujia tunnel to forecast the geological conditions.Geological prediction results are verified by the comparison during tunnel construction.
tunnel geologic advanced prediction Tunnel Seismic Tomography finite difference modeling Mujia tunnel
Xucheng Hong Jianli Wang Ming Huang Chaojie Yan
Zhejiang Engineering Geophysical Prospecting Institute, Hangzhou, PRC
国际会议
杭州
英文
169-175
2018-06-10（万方平台首次上网日期，不代表论文的发表时间）