富水喀斯特隧道穿越大型溶洞施工关键技术研究

Research on Key Construction Technology for Water-rich Karst Tunnel Crossing Giant Karst Cave

随着交通路网覆盖范围逐渐向遍布喀斯特地貌的云、贵等西南地区纵深扩展,势必会遇到大量富水喀斯特隧道穿越大型地下溶洞、溶槽及暗河等不良地质工程。以往采用的注浆封堵工艺工法一方面由于隐蔽工程施工而难以控制施工质量,另一方面也会在一定程度上破坏溶洞地下水径流平衡及周围生态环境。文章以G7611都香高速翠屏隧道穿越大型地下溶洞工程施工为例,系统介绍了溶洞扩挖及支护、溶洞基底清淤及回填等富水喀斯特隧道穿越大型溶洞施工关键技术。

With the coverage of the transportation road network is gradually expanding to southwestern regions of Yunnan and Guizhou,which are covered by karst landforms.It is bound to encounter a large number of water-rich karst tunnels crossing giant underground karst caves,karst troughs,underground rivers,and other adverse geological engineering.The grouting and plugging technology used in the past is difficult to control the construction quality due to concealed engineering construction,and it will also destroy the groundwater runoff balance in karst caves and the surrounding ecological environment to a certain extent.Taking the construction of G7611 Duyun-Shangrila Expressway Cuiping Tunnel crossing giant underground karst cave as an example,this paper systematically introduces the key construction technologies of water-rich karst tunnel crossing giant karst cave,such as karst cave expansion and support,karst cave base dredging and backfilling.