The Research Of Effect On The Modification Of Existing Structures Passed By Shallow Tunneling Construction Of Urban Subway

With the development of the society, urbanization scale expands unceasingly, the subway played an important role in dealing with the ground traffic congestion. In the construction of urban subway tunnel,we will meet poor properties of the formation and surrounding high-rise buildings,inevitably.We will also meet the complex traffic environment such as congested traffic,many municipal pipelines underground and underground building structure shallow buried. The shallow mining method can solve the above problem,and become a large application in underground engineering method. Because the method does not interfere with the normal operation of ground traffic or consider the problem of demolition.What is more, the methods of engineering is flexible and engineering construction cost less without much special engineering equipment. Subway tunnel excavation is not only to meet its own security, but also to ensure the surrounding the existing structures are not destroyed,.However in the actual construction process, grouting reinforcement is simple and effective way in construction process.This paper is based on a large number of literature which is at home and abroad and on the project that the 7th Beijing Subway tunnel pass though the side of platform bridge and underground pipelines.It will analyze the influence of existing structures by tunnel excavation. In order to verify the reliability of numerical simulation,compare between the result of MIDAS-GTS numerical simulation and the calculation and monitoring data. The following is the research content of this article:(1) Summarizes the research present situation and the theory. of predecessors in this topic by a large number of literature which is at home and abroad about shallow tunnel excavation method of metro tunnel construction influence on the existing structures.(2) Analyze the result of MIDAS-GTS numerical simulation based on the project that the 7th Beijing Subway tunnel pass though the side of platform bridge and underground pipelines. It is concluded vertical displacement and horizontal displacement influence of existing bridge and underground pipelines by shallow tunnel excavation method of tunnel excavation and grouting reinforcement.(3) In order to verify the reliability of numerical simulation,compare between the result of MIDAS-GTS numerical simulation and the calculation and monitoring data.(4) It is necessary for soil grouting in the process of construction by comparing the different ruslts of existing structures deformation beetween grouting reinforcement and without grouting reinforcement by shallow tunneling construction of urban subway...