隧道内隐伏岩溶综合探测技术研究与应用

Study and Application of Comprehensive Detection Technology for Hidden Karst in Tunnel

新建铁路磨万线合计有18座可溶岩隧道,大部分位于岩溶强发育区,地质条件复杂,施工难度大,地质灾害隐患高。为规避风险、确保营运安全,对岩溶隧道进行了隐伏岩溶探测,查明了隧底隐伏岩溶的位置、大小和空间形态并用于指导风险评估和岩溶处理,具有非常重要的意义。系统介绍了隧道隐伏岩溶探测采用的风枪探孔+钎探+物探+钻探的综合勘探模式,并用该模式对水电十局承建的磨万铁路第V标3座隧道进行了详细勘查,探明了多处溶洞和破碎带,证实了该模式在铁路隧道隐伏岩溶探测中的有效性。

There are 18 karst tunnels in the newly-built Laos-China Railway,most of which are located in the strong karst development area where the geological conditions are complex,the construction is difficult and the geological hazards risks are high.In order to avoid the risk and ensure the operation safety,the hidden karst detection is carried out for the karst tunnel,and the location,size and spatial form of the hidden karst at the bottom of the tunnel are found out,which is of great significance to guide the risk assessment and karst treatment.This paper systematically introduces the comprehensive detection mode consists of blower gun manhole,drill rod,geophysical exploration and drilling,which is adopted for the detection of hidden karst in the tunnel.With this mode,3 tunnels in the Bid V of Laos-China Railway constructed by the Sinahydro Bureau 10 are investigated in detail,and several karst caves and fracture zones are found out,which proves the effectiveness of the mode in the detection of hidden karst in railway tunnels.