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Karst is a worldwide problem , faced a variety of karst geological disasters in the countries in tunnel construction . Tunnel construction in karst areas , karst development , frequent occurrence of the phenomenon of the sudden mud , water inrush , landslides , caused no casualties, severe damage to construction equipment , affect the duration , and a substantial increase in costs . Therefore , how to avoid and deal with various karst problems encountered , the key will be the construction of the tunnel . Karst areas in China , according to statistics , carbonatite distribution area of ??up to more than 340 million square kilometers . Karst development complex and volatile, many types of variable size , shapes , its main manifestations of the cave , the melting tank , depressions , funnel , sinkholes , collapse and underground river . In this paper, the influence of karst tunnel surrounding rock stability , and the construction process karst Treatment technology , and for most of Zhanghua Expressway Tunnel construction . The contents of this study are: 1 . Explore karst tunnel project , summarizes the general laws of the karst development and control of karst development factors . Rational use of TSP, drilling ahead , advanced geological forecast of geological radar technology to detect karst , developmental status , and provide the basis for the construction and Treatment of karst segment . Zhang spent Expressway Branch Tunnel in the background the FLAC3D numerical analysis software to explore the top of the tunnel , at the bottom of the side positive cavity distribution tunnel surrounding rock deformation characteristics and stress distribution ; discuss the different positions of the cave in the tunnel different sizes , different distance distribution of tunnel surrounding rock stability , as well as the first area of unstable rock . With specific project examples to analyze the karst Treatment the reasonable Treatment research of the cave , according to the size of the location of the cave , with or without filler , filler type ; blocking the main ,排堵combined \thinking to deal with the karst water . In order to ensure the security and the stability of the structure of the karst area construction tunnel , the existing theoretical and empirical , put forward some suggestions.
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