Abstract:
Introduction Urban rail is the most important part of the integrated transportation system, which requires an extremely high degree of deformation control. For a long time, it is a key and difficult work that the adverse effects of bearing platform pile are avoided or reduced because of external operations adjacent to the deep foundation pit and the normal use and operation of the track structure is ensured. Method A deep foundation pit adjacent to Qianshan station of Guangzhou Zhuhai intercity rail transit was taken as an example, the difficulties, deformation requirements and many engineering problems encountered in the process of deep foundation pit excavation were analyzed by means of geotechnical test, numerical simulation, empirical analysis and field monitoring, the influence of deep foundation pit excavation on bearing platform pile and the deformation characteristics of deep foundation pit were studied.
Result The research results show that: the deformation indexes of bearing platform pile of the urban rail station calculated and monitored actual are less than the allowable values, which meet the deformation requirements and construction control requirements of the bearing platform pile of the urban rail station; it is proved to be safe, reliable, scientific, reasonable and practical that the supporting scheme of the underground continuous wall + three internal supports and the other sections adopt the row pile + three internal supports; the construction control measures proposed effectively solve many engineering problems such as difficult construction control, strict deformation requirements and complex site conditions.
Conclusion The reasonable support scheme, reliable numerical analysis, effective construction control measures and research methods and ideas in this paper can provide reference for similar engineering problems.
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