Mechanical properties of the combined retaining structure of frame prestressed anchors and micro steel tube piles in deep foundation pits
DONG Jianhua1，2，ZHUANG Chao1，2
(1. Key Laboratory of Disaster Mitigation in Civil Engineering of Gansu Province，Lanzhou University of Technology，Lanzhou，
Gansu 730050，China；2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering，
Ministry of Education，Lanzhou University of Technology，Lanzhou，Gansu 730050，China)
Abstract：Aiming to solve the difficulties in the construction of deep foundation pits such as narrow construction site，unconsolidated backfill and loose soil area，a combined retaining structure of frame prestressed anchors and micro steel pipe piles was put forward，and the composition and working mechanism of the structure were discussed in detail. Based on the theory of Winkel?s elastic foundation beam，an interaction model between the combining retaining structure and the soil under the tensioning stage and the normal working stage was established，which can be solved by the displacement method and the finite difference method. The supporting effects and mechanical properties of the combined retaining structure were analyzed by the finite element software of ADINA，and comparisons between theoretical and simulation values were performed. The results show that the theoretical calculation results are basically consistent with the numerical simulation results，which verifies the rationality of the calculation model and the analysis method. Compared with the results obtained by the proposed method，the internal forces of the frame column and the micro steel pipe pile calculated without considering the inter-structure implicating effect are respectively smaller and larger，which means the former unsafe while the latter conservative. It is also shown that，compared with the pile anchor support structure or underground continuous wall support structure，the combined retaining structure can effectively control the deformation of foundation pits and the internal force distribution is more reasonable，which reflects good support performance of the combined retaining structure. The research can provide a theoretical basis and reference for the design of similar deep foundation pit support structure.
董建华1，2，庄 超1，2. 深基坑框架预应力锚杆微型钢管桩联合支护结构力学特性分析[J]. 岩石力学与工程学报, 2019, 38(3): 619-633.
DONG Jianhua1，2，ZHUANG Chao1，2. Mechanical properties of the combined retaining structure of frame prestressed anchors and micro steel tube piles in deep foundation pits. , 2019, 38(3): 619-633.
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2019, Vol. 38 
