Numerical Simulation Study On The Movement, Deformation And Support Of Surrounding Rock In Anzi Mountain Tunnel

With the rapid development of China's transportation industry,highway traffic construction has made great achievements,tunnel is the difficulty and focus in highway traffic construction.In the course of tunnel construction,safety is an eternal topic,while construction methods and support are the top priority to ensure the smooth construction of the work.Therefore,it is of great practical significance to study in depth the influence of different construction methods on the stability of tunnel surrounding rock and the different support methods for the study of support effect.This paper takes the design and construction of Anzi Moutain Tunnel in the first phase of Hezhou Road in Zhuanghe City as the practical engineering background,combined with the present situation and characteristics of the surrounding rock in tunnel construction excavation in China,and uses the large finite difference software FLAC~3DD to simulate the construction of the Anzi Moutain tunnel.The stress,strain and displacement distribution of surrounding rock in tunnel under different construction methods are studied.The Force deformation of support structure under different support parameters and the law of tunnel vault settlement are compared with the same construction method,and the reasonable supporting parameters and the parameters calculated by the loosening ring support theory are contrasted to verify the rationality of the numerical simulation.The main research contents are as follows:(1)The Variation law of stress,strain and displacement of tunnel surrounding rock under different construction methods is analyzed separately,and the deformation and failure law of tunnel surrounding rock under each construction method is obtained,and then the actual construction method suitable for this project is obtained by comprehensive comparison and analysis of the deformation and failure law of tunnel surrounding rock under different construction methods.(2)To study the different supporting parameters of the appropriate construction methods,that is,the axial force,vertical and horizontal displacement of the anchor rod under different anchor length and different anchor spacing,and the variation law of the settlement of the tunnel vault,and summarize and generalize the suitable anchor length and spacing,as well as the influence law of the bolt support parameters on the tunnel and the anchor itself.(3)Compare the obtained support parameters with the theoretical calculation results of the loosening circle to verify the rationality of the numerical simulation.This paper has 77 pictures,12tables and 64 references.