Karst tunnel disposal technology has always been a key and difficult issue in the engineering field.Based on the construction conditions of Guizhou section of a high-speed railway,this paper divides the tunnel karst into beaded or pipe-type linear karst caves,cavern-type karst caves and cavern-type karst caves,and different construction treatment measures are put forward according to their different filling properties.In combination with Yakouzhai Tunnel,Doumo Tunnel and Dadushan Tunnel,the treatment measures of typical karst,including unfilled karst cave group,underground river,water-rich filled karst,water-passage karst and clay-filled karst,are analyzed.The main conclusions include:For karst tunnels,the type and characteristics of karst should be considered comprehensively,and the design and construction should be carried out according to local conditions.
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