地震层析成像技术在隧道施工地质预报中的应用

Application of tunnel seismic reflection tomography in tunnel

针对营达高速公路花冠隧道工作面前方地质构造问题,为隧道工程的安全施工提供更为准确的物探资料,采用地震层析成像技术的原理,介绍了该方法在隧道超前地质预报工作的准备事项、工作流程及注意事项。通过在花冠隧道超前地质预报工作的应用研究,表明该方法在隧道超前预报中探测范围广,隧道上下、左右探测距离能达到50 m,前方探测距离能达到150 m;并通过三维成像方法能将隧道工作面前方地质构造异常空间位置直观地表现出来。提高了隧道超前地质预报成果的解释准确度及精度。

In view of the geological structure problem in front of the Huaguan tunnel face of Yingda Expressway,more accurate geophysical data were provided for the safe construction of the tunnel project.Based on the principle of seismic tomography technology,the preparation,work flow and precautions of this method in the advance geological prediction of the tunnel were introduced.The application of the method in the advance geological prediction of Huaguan Tunnel showed that the detection range of the method was wide,the detection distance of the upper and lower sides and the left and right sides of the tunnel can reach 50 m,and the detection distance of the front can reach 150 m.The abnormal spatial position of the geological structure in front of the tunnel face can be visually displayed by the three-dimensional imaging method.The interpretation accuracy and accuracy of tunnel geological prediction results were improved.