高密度电法探测在永古高速隧道工程稳定性评价中的应用

Application of High-density Resistivity Tomography to the Stability Evaluation of Tunnels in Yongdeng-Gulang Expressway

本文采用高密度电法对永古高速公路乌鞘岭隧道北洞口、安远隧道南洞口附近活动断裂带进行了探测,准确给出了隧道口附近毛毛山南麓活动断裂与毛毛山北麓活动断裂的具体展布、发育特征及与初选隧道位置的关系,为隧道地震工程条件与稳定性评价提供了可靠依据。探测结果表明。乌鞘岭隧道北洞口场地位于毛毛山南麓活动断裂下盘的影响带上,断裂最新活动面距隧道上行出口与下行进口最近距离约264m及284m,地震不会影响洞口安全,但须加强防护;安远隧道南洞口位于毛毛山北麓活动断裂全新世左旋正走滑活动区段断面及破碎带上,存在地裂的可能。应采取相应措施。

The high-density resistivity tomography is used for the surveying of the active faults around the north front of Wushaoling tunnel and the south front of Anyuan tunnel in Yongdeng-Gulang expressway. The surveying results show clearly the location and features of the .active faults along the south foothill and north foothill of Maomao Mountain near the tunnels. The north front of Wushaoling tunnel is located on the lower plate of the south foothill active fault along the mountain and the nearest distances to the active fault plane is 264m away from the upper front and 284m away from lower front.The south front of Anyuan tunnel is located just on the north foothill active fault in Holocene epoch and the influence zone along the mountain. According to the characteristics and location of the faults and the tunnel front, the reliable measures should be taken of the earthquake engineering conditions and the stability evaluation.