Seismic Research Station Had A Large Diameter Shield Station Combined PBA Method Enlarging Excavation

With the rapid development of city size, traffic pressure faced rising, raising the city’s subway as an important part of integrated transport capacity, more and more cities started to enter into the trend of subway construction. Beijing Yanshan seismic belt area in central North China Plain seismic zone and the intersection of the seismic intensity of 8 degrees region, part of the location of underground structures under earthquake seismic calculation results often affect the structural design of reinforced, in view of this, the need for earthquake fortification metro area high seismic design of special research. In this paper, the outcome document of the preliminary design in the construction of Beijing Airport Line West Extension Beixinqiao using Sap2000 software and Flac3 d finite difference software, respectively, through the displacement reaction method and dynamic analysis method of large diameter shield over the station combined PBA Method Excavation station seismic research, the main research contents are as follows:(1) By Sap2000 software for two-dimensional structure of the reaction displacement method calculation results show that, under the earthquake, co MPared to a combination of basic and standard composition, structure, side walls and bending moment diagram Shear Diagram appear asymmetry, and the interior shear occurs, the reason may be due to the structure is applied along the direction of the seismic action hypothesis soil relative displacement, shear force and inertia force results.(2) By a combination of the basic structure and standard composite structure internal force calculation, co MParing the combination of seismic response displacement method to calculate the results, the reinforcement structure calculations to determine which location is a combination of seismic reinforcement position control. By co MParing the calculation shows that, in the structure of the side wall and the dome connecting location, is connected with the base plate sidewall structure position control for the combination of seismic reinforcement, other locations for the static load combination control reinforcement, while strengthening the seismic design of structures.(3) Based on the structure calculation and analysis of the seismic response by the displacement method, this paper Flac3 d software for the dynamic structure. Through dynamic analysis results can be obtained with the interior dome is connected to the node position location and other seismic weak position, at the same time get a larger interior horizontal shear stress, the force also contributed to the direct factor structural damage.(4) At the same time, this paper, seismic calculation results for Metro seismic propose necessary seismic design. For elaborated principal structural reinforcement beams and other construction at the same time, also it introduced the steel anchor node position and stirrups encryption measures to ensure that the node has the ability to resist tensile failure. For the subsidiary body connection position, do Deformation settings, conditional case, you can set seismic joints. In addition, the shape of the structure as much as possible regular, rational arrangement of beams, internal forces and force conversion system integrity and reasonable measures.