Study On Stability Of Surrounding Rock Of Highway Tunnel Based On Construction Monitoring And Measurement Technology

With the widespread application of new Austrian tunneling technique,the deformation of surrounding rock has attracted more and more attention.At present,in the process of tunnel construction,the method of monitoring and measuring is adopted to obtain the deformation of surrounding rock.Through the measured data,the stability of surrounding rock deformation is evaluated and the collapse of tunnel is predicted.Based on a large number of monitoring data of two lane highway tunnel in Sichuan,the following research has been done on the stability of surrounding rock and landslide warning.The main results of this paper are as follows:(1)The deformation data of surrounding rock are obtained by collecting monitoring data of two lane highway tunnel construction in Sichuan.Through the regression analysis and mathematical statistics method,the data are analyzed,and the range of deformation of surrounding rock with time and the range of deformation stability are obtained.(2)The mechanical parameters of surrounding rock are calculated by back analysis of surrounding rock deformation data.The three-dimensional numerical simulation of tunnel excavation is carried out by FLAC3D.The total deformation of surrounding rock and the release rate of surrounding rock under different surrounding rock grade and different buried depth are analyzed.(3)By using the method of catastrophe theory and numerical calculation of the combination of the different levels of analysis of surrounding rock in different depth under the condition of node deformation control value and tunnel cross-section area change control value and establish the three level early warning system of surrounding rock collapse.