地质雷达和TGP地震波法在高家坪特长隧道岩溶探测中的应用

Application of Geological Radar and TGP Seismic Wave Method in Karst Exploration of Gaojiaping Extra Long Tunnel

近年来,随着西部大开发战略的进一步实施,西部地区成为国家建设的重点,西南岩溶地区的铁路工程、高速公路在施工过程中常常会遇到复杂多变的岩溶地形及赋存丰富的岩溶地下水,给隧道工程安全构成重大威胁。本次研究以宜城至保康段高速公路中的高家坪隧道Zk45+705~Zk45+845隧道段为研究对象,前期岩溶水文地质调查结果显示,该隧道段存在岩溶突水突泥的风险。首先通过地质雷达法探明Zk45+725~Zk45+735隧道段岩体节理裂隙及溶洞发育;然后通过TGP(Tunnel Geology Prediction)地震波法进一步探测隧道底板岩溶发育情况。结果表明,本次研究通过地质雷达、TGP相结合的物探方法成功地探测了研究工区高风险岩溶发育情况,并据此提出了隧道溶洞处置以及防排水工程设计方案,可为今后的实际施工提供指导。

In recent years,with the further implementation of the western development strategy,the western region has become the focus of national construction.Railway projects and expressways in southwest karst areas often encounter complex and changeable karst terrain and rich karst groundwater in the construction process,which poses a major threat to the safety of tunnel engineering.This paper takes the Zk45+705~Zk45+845 tunnel section of Gaojiaping tunnel in the expressway from Yicheng to Baokang as the research object.The preliminary karst hydrogeological survey results show that the tunnel section has the risk of karst water and mud inrush.The rock mass cracks and karst cave of Zk45+725~Zk45+735 tunnel section are detected by geological radar method,then TGP(tunnel geological prediction)seismic wave method is used to further detect the karst development of tunnel floor.Through the comprehensive geophysical exploration method combined with geological radar and TGP,the karst development of this high risk section is successfully detected.Based on this,this paper proposes the engineering design of tunnel karst cave disposal and waterproof and drainage.It can provide guidance for the actual construction in the future.