Study On The Mechanics Characters Of The Fabricated Linings In The Subway Constructed By Open-Cut Method

At present, the component prefabrication is regarded as an important sign of the technology development in many countries and as an important way to improve the engineering quality and accelerate the construction.Although there are some study & application cases on the forecast technology used in the subway built by the open-cut method, it is scarcely used in our country.When the joint structure is been building and its position is been setting, it need consider not only the stress state of the whole structure, but also the feasibility of the fabrication and installation of the components. What' s more, it should reduce types of the components in order to produce the components on a large scale.Based on the project of "Study on the Design of Prefabricated Linings and Construction Technics in the Subway Constructed by the Open-Cut Method in Guangzhou" , this paper analyzes the mechanical character of the joint and the whole structure by the model test and numerical simulation. After the discussion above, the sound joint setting position and structure are designed.The major finished work is followed:(1) Choosing the type of the whole structure. There are two rectangle structures and two arc structures to be considered. The primary aspects considered include the internal force of the whole structure, the conditions of assembly linings, the speed of the construction, the waterproof and the economic effects.(2) After the joint loading test is done, the theoretical evaluation method of the joint stiffness is given. Meanwhile, it compares the result of the test and the result of theory, analyzes the reasons of their difference.(3) By the FEM method, it analyzes the influence principle of the joint position and stiffness on the whole structure internal force. Combining the joint mechanical model, the sound joint setting position and structure is designed.