EH4与地震反射法在高速公路长大深埋隧道勘察中的联合应用研究

EH4电磁成像系统是一套目前较先进的电磁勘探方法,具有探测深度大、设备轻、速度快、费用低、精度较高、直观等特点。地震反射法具有探测深度大、对地形要求不高、可划分多层界面、能提供波速、精度较高等特点。文章首次把EH4电磁法与地震反射法联合运用于高速公路长大深埋隧道勘察中,两者结果基本一致,由此成功解译出了隧道的软弱层、地下水及断层破碎带的位置,并划分出隧道的围岩类别,为高速公路长大深埋隧道提供了一种新的综合勘察方法。

Application of EH4 Electromagnetic Image System and Seismic Reflection Method in Surveying the Deeply-buried Long Tunnels of Expressways

EH4 electromagnetic image system is one of the most advanced electromagnetic auto collecting and analysis system at present,which is characterized by longer exploring depth,light weight,cost saving,higher accuracy and friendly interface. The seismic refle-ction method has advantages of longer exploring depth,lower requirement for topography,multi-layers display,wave speed availabilityand higher accuracy.The paper analyzes the combination of EH4 and seismic reflection method in the investigation of deeply-buried long tunnels in expressway projects in Yunnan,concluding the same analysis outputs which successfully interprets the location of soft andweak layer,underground water and broken fractures with assistance of other technical method,which provides good rationale for the classifying of surrounding rocks of the tunnel and provides a new composite investigation method for survey and investigation for deeply-buried long highway tunnels.