| In recent years,with the increase in the construction of national infrastructure,the proportion of tunnel projects has become more and more.In particular,the safety management and technical measures for the construction of unfavorable Geological tunnels in the Karst region have become even more important.If the technical measures used in the construction are not scientific and unreasonable,normal safe production will not be guaranteed,and casualties and loss of economic property may also be caused.The difficulties in the construction of the Dadushan tunnel,which is one of the typical high-risk tunnels in the Karst area,are mainly Karst,Karst water,and weak surrounding rock collapse and palm surface extrusion.The most obvious manifestation of Karst is the cavity or filled cavity formed by the permanent erosion of soluble rock masses by surface water and groundwater or the destruction of soluble rock masses by motion.This destruction of soluble rock mass by chemical erosion and physical movement forms the dissolution phenomenon of rock mass.In tunnel construction,the weak surrounding rocks are often characterized as Class VI and Class V surrounding rocks.The proportion of these surrounding rock masses is relatively large,and they are severely eroded by groundwater and rainwater.The rock masses are layered stone soils and broken particles.In serious cases,rock mass surrounding rock can not be stabilized,and it quickly softens after encountering water,and it is prone to collapse.Cave-body diseases,water-burst mud diseases,filling caverns and cavernous caverns,collapse capping,surface collapse and soft crushing surrounding rock collapse are typical manifestations of the hazards of tunnel construction in Karst area.Therefore,in the construction and construction of Karst terrain tunnel,the rational construction technology management method plays a vital role in the safety and security of the tunnel.At present,there are many methods for treating various types of Karst in various countries,but some methods have great security risks and need to be further studied.In the course of railway construction,there has been a constant flow of water,mud,caves and weak surrounding rocks,and corresponding technical problems have arisen concerning the design and construction of tunnels in the Karst region,due to the concealment and danger of tunnel construction.For the tunnel through the cave,water and weak surrounding rock construction technology research has a lot of development space. |
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