(1. The Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；2. The Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education，Lanzhou University of Technology，Lanzhou，Gansu 730050，China)
Abstract：This article is based on a deep foundation pit project in Lanzhou area which has complex surrounding environment and limited construction space. In the special situation that the foundation piles of the main building have been constructed and the underground garage will excavate subsequently，the article puts forward the idea that regarding the multi-row foundation piles as the support objects for the foundation pit of the underground garage. It also establishes the relevant calculation model to calculate the internal force and deformation degree of the foundation pit during excavation. At the same time，the article verifies the reliability of the model by the finite element tool，and compares the result with the actual monitoring data. The results indicate that：the new support form，“dual-purpose pile”can save space greatly，using group-pile as multi-row pile support，it can control soil displacement and the deformation of envelop enclosure effectively. Compared with the traditional pile-anchor supporting structure，the new one is more economical. It can avoid many constructions of support pile，save much time and material costs，and achieve the“dual-use pile”successfully. This article reflects the huge advantages of the new support structure. It can provide reference to similar deep foundation pit support structure in this area.
周 勇1，2，朱乔红1，2，朱彦鹏1，2，苏天涛1，2. “一桩两用”新型支护结构在某深基坑支护中的应用分析[J]. 岩石力学与工程学报, 2020, 39(S1): 3168-3177.
ZHOU Yong1，2，ZHU Qiaohong1，2，ZHU Yanpeng1，2，SU Tiantao1，2. The application analysis of“dual-purpose pile”new support structure in a deep foundation pit. , 2020, 39(S1): 3168-3177.
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2020, Vol. 39 
