The Study Of Stability And Deformation For Cao Mao Mountain Tunnel

With Chinese reform and opening up development, large-scale infrastructure projects are being built, especipcially in civil engineering. Many deep and long tunnels have begun to built, and a few of them pass through the high stress area, karst area and weak rock mass. They often lead to large deformation and other related geological disaster, so studying the stability of wall rock on the tunnel project is very important work.The paper describes the project overview and main design of CaoMao moutain tunnel. Based on a large number of tracking studies on the construction site, the reason of surrounding rock deformation is studied in the CaoMao moutain tunnel; in the detailed analysis the overall situation of the tunnel, Using the latest results of modern tunnel support and construction methods, numerical simulation methods and mathematical theory above analysing the overall tunnel, situation, the deformation and stability prediction are discussed from the surrounding rock theory, support method and fuzzy prediction.Main findings are listed as following:(1) Using the ANSYS numerical simulation, the stress concentrated in central of tunnel arch waist, so support and monitoring should be enhanced in the arch waist.(2) The paper provides general preventive measures in tunnel deformation, the control measures in the swelling rock section, the control measures in the sandy loam section and groundwater control measures during excavation.(3) The paper applicates fuzzy theory to establish a long-term stability prediction method in the tunnel rock, it is a method that considering various factors methods and combining qualitative analysis and quantitative analysis.