地震映像法在铁路隧道隐伏岩溶勘查中的应用

宜万铁路沿线的大部分隧道位于岩溶强发育区,埋深大,地质条件复杂,施工难度大,地质灾害严重,为规避风险和确保营运安全,对岩溶隧道进行隐伏岩溶探测,查明隧底隐伏岩溶的位置、大小和空间形态,从而指导风险评估和岩溶处理具有非常重要的意义。本文介绍了地震映像法的工作原理和解释方法并用该方法对宜万铁路岩溶隧道的隧底15~20m深处进行了勘查,探明了多处溶洞和破碎带,证实了该方法在铁路隧道隐伏岩溶勘查中是有效可行的。

Application of Seismic Imaging Method to Exploration of Hidden Karst Under Railway Tunnel

Most tunnels along Yiwan railway are located in the area where karst mostly developed,so it makes the construction more difficult and geological disasters more serious.In order to avoid the risk and ensure the safety,it is very important for the risk assessment and karst treatment to explore the hidden karst under the tunnels and to make sure its allocation,size and spatial form.In this paper,we introduced the principle and the interpretation of seismic imaging method,applied it to hidden karst exploration at the depth of 15~20m under the karst tunnels along Yiwan railway,found many karst cavities and fractured zones,and proved this method is effective and efficient in the complicated geologic condition.