Numerical Simulation Of Tunnel Excavation With Qing Qiao Multi Arch

In recent years,with the development of China's economy,China's highway to enter the rapid development,a large number of funds invested in the tunnel area.The construction of the tunnel is of great significance to shorten the mileage of the highway.The main advantages are convenient,quick,saving time,little damage to the environment and so on.The tunnel line affected by geological environment or other factors,in the construction process,most of the tunnel or separated tunnel with small spacing,but sometimes the construction of the tunnel is not only affected by the geological environment and other factors,also affected by the topography and the horizontal and vertical lines and other factors,it is necessary to arch tunnel from line selection,survey,the design,construction and other aspects.This paper relies on the engineering geology and general survey of Qing Qiao tunnel,and the surrounding rock grades are grade IV and V,which belong to weak surrounding rock.According to the relevant data and information provided by the project,the investigation,theoretical research and related calculation are carried out,and the concrete results are as follows:(1)according to the theory of numerical analysis and calculation,the equation of motion for blasting vibration of underground structure is established,and the basic theory of blasting dynamic numerical simulation is analyzed.(2)the finite element model is established by ANSYS software,through the ?,?rock of shallow tunnel excavation process of static analysis of arch,comparing the stress of surrounding rock and lining stress changes,different grades and different depth of surrounding rock under the condition of maximum displacement and stress of surrounding rock.(3)the basic theory of transient dynanics,a three-dimensional numerical model,using ANSYS software to analyze the right pilot tunnel blasting vibration velocity,blasting vibration velocity of the main tunnel,the vibration velocity,displacement field are analyzed.(4)according to the finite element calculation results and the measured data obtained by monitoring and measurement,the difference between the two is compared and analyzed.The accuracy of the numerical simulation method is verified by comparing with the field monitoring data.