Study On Information Construction And Risk Assessment Of Tunnel In High Ground Stress Area

With the continuous development of China's western region,China's railway tunnel project has entered a period of rapid development.In china's western region,especially in the southwest region,where mostly mountainous areas,the geological and environmental conditions are more complicated.In the process of railway tunnel construction,some geological disasters such as collapse and deformation of the surrounding rock were encountered.These geological disasters will bring great hidden danger to the safety of construction personnel.Therefore,in the process of railway tunnel construction,information-construction engineering and analysis of the factors that affect the tunnel surrounding rock stability has a great significance for the construction safety of tunnel.In this paper,based on the engineering background of Chang Ping Tunnel of Li Xiang Railway,the risk analysis of tunnel surrounding rock stability is carried out,and the main research contents of this study include the following aspects.1.In this paper,the development status of TSP advanced geological prediction,site monitor measurement,field monitoring measurement,measurement of ground stresses and the development statusof Bayesian network in high stress area are discussed in detail in this paper.2.Theproject profile of Chang Ping Tunnel of Li Xiang Railway is briefly introduced,The development of information technology(on-site monitoring and TSP forecast forecast)program,on-site monitoring and advance forecast.According to the measurement data of the typical cross-site monitoring data,the prediction model is constructed based on the least squares method to predict the deformation trend of the surrounding rock.Through the analysis and analysis of the TSP forecasting parameters,a tunneling method based on TSP forecasting parameters is established,And the stability of surrounding rock in typical sections of Changping tunnel is analyzed.3.The results show that the Changping tunnel is mainly composed of horizontal principal stress and Rc / ?max in the range of 1.19 and 1.96,and the stress of the Changping tunnel is analyzed by hydrocracking.,The original stress level of the tunnel is extremely high stress level.4.According to the actual situation of the project,there are many factors influencing the stability of the surrounding rock of the tunnel.In this paper,the initial stress state,the main structural surface,the excavation section,the supporting strength,the supporting time and the surrounding rock level of the Changping tunnel are taken as the research factors,The Bayesian network risk assessment model is constructed,and the natural factors and the risk of human factors in the process of tunnel construction are evaluated.It is concluded that the stress of the original rock has a crucial influence on the stability of the surrounding rock in the high stress region.