乐滩灌区TBM岩溶隧洞不良地质问题及处理对策

Adverse geological problems and treatment measures of TBM karst tunnel in Letan irrigation area

介绍了桂中治旱乐滩水库引水灌区工程TBM隧洞施工优缺点、主要勘察技术方法和手段。论述了TBM隧洞段工程地质及岩溶发育特征。结合隧洞掘进揭露的地质条件和围岩情况,总结了隧洞岩溶突水、断层破碎带、顶拱不稳定块体及有害气体等主要不良地质问题及针对性的处理措施。

With regard to the Letan Reservoir Irrigation Zone Project,an introduction was made on the advantages and disadvantages of TBM tunnel construction,main survey technical methods and means adopted,the engineering geology and karst development characteristics of TBM tunnel section.Combined with the geological conditions and surrounding rock situation exposed by tunnel excavation,the author summarized the targeted treatment measures for the major adverse geological problems such as karst water inrush in the tunnel,fault fracture zone,unstable block at the top arch and harmful gas.