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