The Influence Of Shield Tunnel Construction On Nearby Buildings

At the present stage our country accelerating the pace of urbanization process,urban traffic congestion is becoming more and more serious.At the present stage our country accelerating the pace of urbanization process,urban traffic congestion is becoming more and more serious.Only use a lot of public transportation system,especially as the city transportation the backbone of the subway,can effectively relieve all kinds of ground traffic congestion problem of poor operation,improve the efficiency of urban transportation.Into the 21 st century,the construction of subway tunnel construction by shield method become the hot method,summary of the shield tunnel construction practice experience,you can see the shield construction technology in the increasingly progress,construction of strata disturbance a lot smaller than other methods to build the tunnel,but still can't completely avoid disturbance on the surrounding soil,side wear on or close to the ground buildings,caused by the loss of soil will be more or less affect buildings,settlement or tilt,affect its safety.This paper in view of the nearby existing buildings of shield tunnel construction,the application of finite element software MIDAS GTS NX build buildings and the soil of shield tunnel-3 d model,the effect of study of shield tunnel construction effect and the influence law of adjacent buildings,to provide basis for the planning of the subway tunnel line in the future.First of all,this thesis introduces the development status and the main construction of shield tunnel construction,and the tunnel construction of the main causes of perturbation and influence on soil.In accordance with the formation of shield construction disturbance,in turn,affects the building tilt and settlement,three different types of evaluation are given control of the disturbance of subway construction to the formation evaluation standard and calculation method.Second,through the numerical simulation software to establish a finite element model of shield tunnel and buildings both numerical simulation calculation,analysis of surface subsidence induced by along with the advancement of shield tunneling,the law of the development of research of adjacent existing buildings caused by shield tunnel construction characteristics of horizontal and vertical distribution of ground surface settlement curve.Calculation results show that cause lateral surface settlement of shield construction of empirical formula calculation results and the presence of the surface subsidence is building empirical formula calculated value is larger.Finally,the study of deformation and displacement of the building,the analysis method of shield tunnel construction on nearby buildings the effect and influence law of different location and distance tunnel building deformation characteristics and displacement change rule.The closer distance tunnel adjacent buildings,the greater the building settlement,maximum settlement and the structure of the tilt is not beyond the security restrictions,based on the predictable construction for safety state.