Analysis and Research on the Calculation Model of PBA Subway Station by Modified Incremental Method
The construction process of PBA(Pile-hole method)subway station is sorted out,and the traditional incremental calculation model is analyzed theoretically.The idea of calculating the internal force of each construction stage cannot fully reflect the nonlinear characteristics of the actual station structure system when the traditional incremental method(load structure model)is linearly superimposed.Therefore,Drawing on the concept of stress history of the stratum structure model,a modified incremental method calculation model is proposed to reflect the internal force adjustment and redistribution of the station structure system through internal force inheritance and re-iterative balance.Through the quantitative calculation and comparative analysis of engineering cases,the research results show that the modified incremental method calculation model can solve the problem of traditional incremental method calculation model.It is suggested that the modified incremental method model and the traditional incremental method model should be used simultaneously for structural design calculation in the subway station project of the hole pile method,and the final reasonable design index should be determined by comprehensively comparing the results.
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