The Analysis Research On Danzishi Open-cut Station Construction’s Impact On Neighbouring Abutment

With the rapid development of the economy and the continuous improvement of urbanization rate,the current urban traffic has been unable to meet the demand of the increasing urban population.As an important part of urban infrastructure and traffic,urban rail transit provides convenience in people’s daily life,and it adapts to the fast-paced life of city people well.Urban subway and station building will exert a series of influence on surrounding environment,such as blasting vibration,stratum settlement and horizontal displacement,etc.Taking Danzishi open-cut station as the research object,this paper analyzes its construction’s impact on the neighbouring abutment of Chaotianmen Bridge.Through investigation,theoretical research and related calculation,the main research contents and results are as follows:1 Based on geological conditions and actual situation,both pile-plate support and pile-plate retaining wall are designed as two support patterns in Danzishi open-cut station.Through comparision analysis of stress field,displacement field and abutment displacement,the pile-plate support is proved to be the optimal design scheme.At the same time,the displacement value and stress value obtained in every stage can satisfy the requirements of specification.2 Three working conditions,in which the vertical excavation height is respectively 2m,4m and 6m,is calculated and analyzed.It is concluded that the best vertical excavation height for this project is 6m.3 For longitudinal excavation method of foundation pit,two working conditions,in which the excavation method is respectively from two sides to the middle and from the middle to two sides,is calculated and analyzed.It is concluded that the best excavation method is from the middle to two sides.4 For horizontal excavation method of foundation pit,two working conditions,in which the excavation method is respectively from two sides to the middle and from the middle to two sides,is calculated and analyzed.It is concluded that the best excavation method is from two sides to the middle.5 According to the results of finite element calculation and measured data,the causes of errors between them is analyzed.At the same time,the accuracy of the numerical simulation method is verified.