Study On Shield Construction Technology For Tunnel Of Wuhan Metro Line 27

With the development of social economy,the process of urbanization in China is getting faster and faster,and urban land is becoming more and more tense.The problem of population growth and traffic congestion is becoming more and more prominent.In order to alleviate these contradictions,people try to develop underground space,Subway is a more typical method.Subway tunnel construction methods are mainly digging method,mine method and shield method.Shield method has the advantages of high degree of automation,reliable construction quality,small environmental pollution and short construction period.It has been widely used at home and abroad since the 1960s.The main construction process of the shield method includes:the preparation of the shield machine,the shield origin,the shield tunneling construction and the arrival of the shield and so on.Wuhan City Rail Transit Line 27 Phase II of the second section of the North China Street Station?Zhifang Street Station shield area to be used in two sets of North Heavy Industry shield machine construction,from the paper Square Street Station assembly and commissioning to North China Street Station Digging,disintegrated in North China Street Station,hanging out.The method is mainly applied to the construction of viscous soils such as silt,silty clay,silty silt and silt layer.The principle is to rely on the thrust of the propulsion cylinder to open the soil Digging the pressure to increase the excavation surface stability.Earth pressure balance shield machine covers an area of small,adaptability to the rock,with a reliable tool change function,the environmental pollution is small,more suitable for the construction of this project.This paper first introduces the engineering overview,hydrogeological conditions,and water supply and ventilation conditions of Beihua Street Station?Zhifang Street Station in Wuhan Railway Line 27,Phase ?,Wuhan Railway Project.Then,the concrete steps and construction technical problems of the construction of the shield before the construction of the shield tunneling method,the excavation of the shield and the arrival of the shield are described.Finally,the key and difficult problems of the project are analyzed.solution.Wuhan City Rail Transit Line 27 combines the characteristics of tunnel shield construction technology,and this project is a very good match.In this paper,the construction process and construction procedure of the shield method are described in detail.This paper analyzes the advantages and disadvantages of the construction process of shield tunneling and the difficult problems and the solutions of the engineering.For the future construction of a more comprehensive construction technology theory and practical guidance.