| With the rapid development of China's infrastructure and promoting the further development of the western region,the rapid development of railway,highway and underground Project,a lot of long and deep tunnel are starting. The soft rock and high stress areas across the body, often leads to large deformation of soft rock related to geological disasters. Peripheral rock large deformation is a kind of great hazardous geology casualty of underground engineering. Master the deformation affected by the construction and excavation of weak rock tunnel, taking effective control measurements is very important to assure the smoothly construction of Tunnel.The dissertation was introduced the soft rock Tunnel and great deformation that the control technique development and the research status. Based on the well-known examples of large deformation of the tunnel analysis, the basic characteristics of the surrounding rock large deformation of the tunnel is summarized. Based on the basic principle and characteristics of finite element, numerical simulation was conducted to Ming Yazi tunnel by using the finite element. Analyses the stress and strain characteristic that caused by differert excavation scheme in surrounding rock tunnel. It is minimuly to deformation and stress relaxation progralmme with CRD method. This excavation programme is more suitable for the engineering environment which is an ideal excavation programme.Numerical simulation was conducted by using the finite element to Ming Yazi tunnel primary support lining, which chooses different Shotcrete Strength and thickness combination scheme. Meantime analyzes the different combination scheme to supporting effect of the soft rock tunnel. Finally the bolt design of primary support was optimized analysis, Comparisons the optimization calculation results, in order to judge the optimization that rationality of the key position anchor Settings.
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