黄陵断穹北缘盖层岩溶水文地质结构建立及其在深埋长隧洞工程的应用  

Building of karst hydrogeological structures on the northeast wing of Huangling faulted dome and its application in the deep-buried long tunnel engineering

作　　者：许琦 向家菠 王吉亮 贾建红 张广厦 Xu Qi;Xiang Jiabo;Wang Jiliang;Jia Jianhong;Zhang Guangsha(Three Gorges Geotechnical Consultants Co.,Ltd.,(Wuhan),Wuhan 430074,China;Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China;Key Laboratory of Water Grid Project and Regulation,Ministry of Water Resources,Wuhan 430010,China)

机构地区：[1]长江三峡勘测研究院有限公司(武汉),武汉430074 [2]长江设计集团有限公司,武汉430010 [3]水利部水网工程与调度重点实验室,武汉430010

出　　处：《工程勘察》2024年第10期36-43,共8页Geotechnical Investigation & Surveying

基　　金：长江设计集团有限公司项目(CX2021Z01).

摘　　要：引江补汉工程是南水北调后续工程,其输水隧洞穿黄陵断穹北缘盖层震旦系至奥陶系碳酸盐岩段线路附近岩溶发育强烈,岩溶突涌水是隧洞建设过程中的重要风险。基于地质测绘及钻探成果,建立区内岩溶水文地质结构,综合岩溶水文地质调查、水文地球化学等多种方法对研究区岩溶地下水系统特征及隧洞突涌水条件进行了分析。结果表明:研究区为多层含水结构,自上而下形成相对应的四个含水系统,不同含水系统地下水循环条件及岩溶化程度不同,钻孔验证了相应条件下的岩溶发育特征。输水隧洞主要在震旦系灯影组(Z2dn)含水系统和寒武系天河板组—石龙洞组(∈1t+sh)含水系统中穿过,相应可溶岩的岩溶发育较弱,围岩以裂隙、溶隙介质为主,隧洞遇岩溶管道产生涌水突泥的风险较小。但存在断层导通上部寒武系上统—奥陶系下统(∈3+O1)含水系统而发生涌水突泥的可能。研究成果可为工程设计提供重要依据,研究思路与方法亦可为同类工程提供借鉴。The Water Diversion Project from the Three Gorges Reservoir to the Hanjiang River(WDTGH)is the follow-up project of the Middle Route Project(MRP)of South-to-North Water Diversion(SNWD).The diversion tunnel passes through the northeast wing of the Huangling faulted dome,and is constructed from the carbonate rocks of the Upper Yangtze Sinian to Ordovician.The distribution area of the carbonate rocks has strong developed karst,and the karst water burst is a key risk during tunnel construction.Based on the geological mapping and drilling data,the karst hydrogeological structure is established,and the characteristics of the karst water system and the water inrush conditions of the tunnel are analyzed by using integrating karst hydrogeological surveys and hydrogeochemistry analysis.The results indicate that the area has a multi-layer water bearing structure,and there are four corresponding water-bearing systems from top to bottom.The circulation conditions of underground water and degree of rock dissolution vary among different water bearing systems.The boreholes have verified the karst development characteristics.The main body of the diversion tunnel passes through the Sinian(Z2 dn)and the Tianheban-Shilongdong(∈1 t+sh)aquifer systems.The karst development is generally weak,and the surrounding rock is mainly composed of cracks and dissolution fissure.However,there is a possibility of water inrush and mud outburst due to the fault leading to the Upper Cambrian Lower Ordovician(∈3+O1)karst aquifer system.It can be concluded that the results can provide an important foundation for engineering design,while the study ideas and methods also serve as the reference for similar projects.

关 键 词：黄陵断穹 岩溶水文地质结构 岩溶发育特征 深埋长隧洞 

分 类 号：TU41[建筑科学—岩土工程] TV221.2[建筑科学—土工工程]