Tunnel Risk Analysys And Application Based On Stratum Variation

With the rapid development of tunnel engineering,the reality of frequent accidents is very worrying.It is not difficult to find out that the tunnel collapse accidents are the most serious.Based on the 8.30 Yuejiagou tunnel collapse accident,this paper studies the mechanism of tunnel collapse and emphatically studies the simulation analysis model of tunnel collapse accident risk prediction and prediction,and provides reliable data support and reference for tunnel and underground engineering construction risk prediction research.It is of great significance to study the geological conditions of the tunnel before construction and to forecast and control the occurrence of geological disasters.It is also of great reference value to the prevention of the accident in the future tunnel construction.In this paper,the geological variation characteristics of geology and geology of Laishui-Laiyuan section of Zhangshi high-speed are discussed,and the corresponding simulation analysis and calculation method are put forward,which is applied to the simulation analysis of Zhangshi high-speed Yuejiagou tunnel.The main work is as follows:1.Based on the existing Markov stochastic chain theory,the statistical theory of stochastic distribution of rock strata is transformed into the stochastic transfer state matrices of rock strata by stochastic simulation calculation,and combined with the integration of tunnel engineering investigation data and existing analysis techniques.The method of interval drilling information correction is adopted to reduce the randomness of the model and improve the credibility of the simulation results of the tunnel surrounding rock.Then,the Markov model is modified twice with the geophysical data,and the simulation results are optimized to ensure the reliability of the simulation results.On this basis,Mont-Carlo method is used to simulate the geophysical parameters of rock and soil with the known principle of phase control constraint,and the model of geo-physical property parameters is established.2.According to the data of ZKSD12-3,ZKSD12-4 and ZKSD12-5,the state map of regional geological profile is established,and the real reliability of the model is verified by the actual engineering data.3.To establish the right tunnel(RK73+450~RK77+450)of the tunnel in the direction of the tunnel to predict the distribution of the surrounding rock of the tunnel section,to divide the dangerous zone during tunnel construction,to analyze the tunnel construction risk.Underground engineering design and construction to provide a reliable basis.