华北丘陵区某隧道岩溶发育特征及处理措施研究

以华北丘陵区某岩溶隧道为例,为探明该隧道岩溶发育规律及成因,并据此提出具体的施工处治措施。对该隧道工程地质及水文地质特征进行综合分析,并在勘测及施工期间进行地质测绘、超前地质预报及地质雷达等一系列工程地质和物探工作。结论:该隧道岩溶为地下水沿裂隙溶蚀形成的竖向为主、弱发育、裂隙型无充填物岩溶;探地雷达及超前水平钻相结合的超前预报对隧道岩溶探测效果良好有效;采用"超前预报、注浆固结、超前支护、堵排结合、加强监测"等手段,对不同位置不同类型的溶腔进行针对性处理,现场显示处治措施效果良好。

Research on Karst Development Features and Treatment Measures of a Tunnel in Hilly Region of North China

With reference to a tunnel in hilly region of North China,this paper studies the karst development characteristics,analyzes the causes and puts forward specific measures. The engineering geological characteristics and hydrogeological conditions are analyzed comprehensively. Moreover,geological survey,advance geological forecast and ground penetrating radar detection were conducted during the construction. The results show that the tunnel karst is featured by weak development without fillings and formed along the crevice corrosion of groundwater in vertical direction. The employment of geological forecast,ground penetrating radar and advance horizontal boring makes the detection of tunnel Karst more effective. Such measures as geological forecast,grouting-consolidation,advanced support and caulking with draining and intensive monitoring are very effective in treating dissolved cavity according to the type and location of cavities.