The Numerical Simulation Of Deformation Of Soil For The Railway Line Of Shitai Introduction Line Of Shijiazhuang Subway Line 1

With the continuous development of economy and the continuous improvement of the level of urbanization, urban road traffic pressure was increasing. To ease traffic pressure, several cities of China have carried out the subway tunnel construction project, among them, the shallow depth excavation method as a major subway tunnel construction method has been widely used. According to formation damage theory, the shallow depth excavation tunnel construction is bound to soil disturbance of surrounding rock, resulted in formation of stress redistribution, cause the horizontal displacement of soil layer, and the subway tunnel is located in the city centre, more concentrated distribution, large population, buildings and pipelines of stratum deformation have more strict requirements, therefore, research of strata deformation caused by the subway tunnel construction characteristics and laws of construction safety and the surface has great significance to the environmental protection.This paper, taking shijiazhuang metro line 1 stone too lead in railway as an example, using the method of numerical simulation and experimental data analysis, the vault subsidence in the process of construction, tunnel level convergence and the surface subsidence is studied, the main research contents and results are as follows:(1) Using the method of numerical simulation, analyzes the different construction methods and embedment depth and whether do forepole under the condition of the surface subsidence and deformation of tunnel horizontal constringency and arch sedimentation regularities.(2) By the methods of comparative analysis, the analysis of the various construction stages of strata subsidence and horizontal displacement of deformation and deformation rate, it is concluded that the steps in different stages of the construction of stratum deformation characteristics.(3) Study the excavation face forward, horizontal and vertical deformation characteristics of the surface subsidence, including excavation surface and the distance monitoring cross section and surface subsidence, settling tank curve of the relationship between morphology and the influence of stratum deformation, etc.