Research On Construction Method Selection Of Shallow Buried Large Section Subway Station

With the rapid development of Chinese economy and city change a courseaccelerate, the original city road traffic system has been unable to meet the people’sdemand for travel, to alleviate the increasing traffic pressure, China each are big city areto speed up the construction pace of city track traffic system. However, in thedowntown building tall and dense, population density, traffic flow, bus lines, the designof metro stations by increasing construction space, around the pipes, near the existingbuildings, busy ground transportation and many other conditions, this makes MiningMetro Station with its unique advantage of more and more appear in city subway.However, the main functions include the subway station for passenger service area,operation area, office area, equipment area, track area, in order to meet the stationsection size is much larger than the interval tunnel, so the design difficulty, theconstruction difficulty is a tunnel greatly increased.Taking Chongqing metro line six Beibei station based on phase two project,through theoretical analysis, numerical simulation and field measurement, the bias ofthe shallow large section subway station construction method made a detailed study anddiscussion on. The paper mainly completed the following work:①The paper summarizes the domestic and international of bias of the shallowlarge section subway station construction method research, using3D finite elementmethod, using MIDAS/GTS finite element analysis software for section step number,width of core soil, heading excavation sequence, first heading to length and each cyclicfootage of length5factors for shallow bias large section subway station constructionmethod selection effects, a total of20numerical analysis model for comparativeanalysis. Conclusion for the section number of steps and core soil width of bias of theshallow large section subway station construction method selection of the2mostinfluential factors, but several other factors can not be ignored.②The numerical results calculated by the model were analyzed, and theestablishment of an evaluation of bias of the shallow large section subway stationconstruction method, safety model.③The establishment of model on Beibei Station Excavation Method forevaluation of Beibei station, the practical construction method numerical simulation, inorder to validate the practicability of model and accuracy.