The difference in the use function of the main structure inside the supporting transport hub of Chaoyang Station of Beijing metro makes the hub pit present the characteristics of "complex planar geometry, different depth of pit excavation and asymmetry of additional loads around the pit". In order to solve the problems of the conventional pit support structure, a multi-level deep pit support structure system was developed based on the concept of graded excavation and multi-level support. The paper discusses in detail the arrangement, structural parameters and construction sequence of each level of support structure. Numerical simulation and on-site monitoring methods are used to study the force and deformation characteristics of the multi-stage deep foundation pit support structure system during the excavation process. The research results show that: based on the concept of graded excavation and multi-level support, the developed multi-level combined support structure system has the characteristics of flexible arrangement form and strong deformation control ability. The support structure system is affected by the additional disturbances from the excavation of all levels of foundation pits, showing "cantilever + bow" deformation. The horizontal deformation of the enclosure structure on the side immediately adjacent to the high-speed railway station is much larger than that on the side far away from it, but when the spacing between the various levels of foundation pits exceeds three times the excavation depth, the additional influence of the deformation of the previous level of structure can be ignored. The numerical simulation and on-site monitoring results show that the deformation and force of the multilevel combined support structure can meet the requirements of the control value, and it can provide a better reference for the similar projects.
Cui Xiangyang
,
He Huafei
,
Wang Jiahao
,
Li Zhaoping
,
Liu Teng
. Integrated Design and Analysis of Multi-Level Deep Foundation Pit Support Structure Adjacent to High-Speed Railway Station[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 783
-792
.
DOI: 10.20174/j.JUSE.2024.S2.31
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