壁板坡特长隧道岩溶发育特征与超前探测

Karst Features and Advanced Detection of Extra-long Bibanpo Tunnel

岩溶是壁板坡隧道的主要不良地质类型,研究如何进行准确预报及分析岩溶发育特征,对隧道施工安全具有重要意义。根据实际揭露的岩溶,从纵向和横向两个方面,全面分析壁板坡隧道岩溶的发育特征,根据形状将岩溶分为长条型、半球型和点孔型。介绍壁板坡隧道TSP、地质雷达、红外探水及超前水平钻探相结合的综合预报方法,以左线某处溶洞为例,论证该综合预报方法的准确性,证明是适用于特长隧道岩溶地质超前预报的可行方案。

Karst is one of the main unfavorable geology in the Bibanpo tunnel. It's important to find out the way to forecast accurately karst development and analyze its features to ensure normal tunneling.Karst features are analyzed from vertical and horizontal aspects based on revealed caves. Those caves are classified by shape into three categories: strip,hemisphere and dot-hole. A comprehensive forecast method employing TSP, geological radar, infrared detection and advanced horizontal core drill is introduced. With reference to a cave in left line,the comprehensive forecast method is proved accurate and feasible to predict the geological conditions in extra-long tunnel.