Loess Double Arch Tunnel Construction And The Surface Subsidence Mechanism And Control Technology Research

Double arch tunnel is applied more and more widely,and its span is large and construction difficulty is high.In this paper,in view of the double arch section of Wang Jia Hui arch tunnel,the large finite element software ANSYS is used to simulate the construction of the double arch tunnel in Wangjia society.Through the analysis and simulation,the changes of the surface settlement,the surrounding convergence and the internal force of the support and the stress of the middle wall are obtained through the analysis and simulation.The first main stress of the middle partition is larger in the bottom of the structure and in the junction of the middle wall and the inverted arch.The third main stresses are larger at the top and the bottom.These are the places where the stress concentration is easily produced,so it should be strengthened in the design.The three-dimensional linear elastic analysis is carried out on the background of the Wangjia double arch tunnel.The spatial effect of the excavation face and the mutual influence of the construction of the left and right tunnels are analyzed and studied.The results show that,based on the comprehensive numerical analysis and construction convenience,on the basis of the four step excavation method,the horizontal lateral bracing auxiliary method can effectively reduce the horizontal displacement of the tunnel wall and the vault subsidence,and the structure is subjected to the force condition of the structure by using the ANSYS finite element software,and the result shows that the safety factor of the structure is calculated.The result shows that the structure's safety factor is calculated.Proper increase of lateral braces and other supporting measures can effectively improve the safety factor of structures.