隧道隐伏岩溶处理施工技术

Tunnel Concealed Karst Treatment Construction Technology

隐伏岩溶埋藏在已成岩的非可溶性岩层之下的岩溶。这种岩溶一般不反映于地表,主要体现为揭示为岩层节理裂隙异常发育、溶蚀严重、不规则溶洞等,如处理不妥当容易造成隧道岩溶地下水在雨季突涨,压力聚增,在拱顶边墙形成大量射水式泄露,对联调联试及后期运营造成严重影响,隧道施工过程中要加强隐伏岩溶钎探,对发现的岩溶及时处理,做好引水、堵水等防排水措施。本文以成贵铁路中铁十八局集团第四工程有限公司管段为例介绍隧道隐伏岩溶处理施工方法。

Concealed karst is karst buried beneath an insoluble rock formation. This kind of karst is generally not reflected on the earth’s surface. It is mainly revealed as the abnormal development of the joints of the rock strata, serious dissolution, irregular caves, etc. If the treatment is not proper, it is easy to cause the tunnel karst groundwater to rise suddenly during the rainy season, and the pressure will increase, and a large number of water-jet leaks will be formed in the arched side wall, which will seriously affect the joint adjustment test and later operation. During the tunnel construction process, the hidden karst brazing should be strengthened, the discovered karst should be treated in time, and water and drainage measures such as water diversion and water shutoff should be done. This paper introduces the construction method of tunnel concealed karst treatment by taking the section that is constructed by China Railway 18 th Bureau Group No. 4 Engineering Co., Ltd. of Chengdu-Guiyang railway as an example.