Mechanical model to estimate the uplift bearing capacity of soil nails of steel tubes
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  • WANG Zhengzhen

    WANG Zhengzhen

    School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China
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  • LI Mingcong

    LI Mingcong

    School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China
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  • ZHANG Lei

    ZHANG Lei

    School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China
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  • ZHOU Yong

    ZHOU Yong

    School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China
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  • YE Shuaihua

    YE Shuaihua

    School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China
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  • MA Tianzhong

    MA Tianzhong

    School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China ;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology, Lanzhou 730050 , Gansu, China
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TU473

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    Abstract:

    Soil nails of steel tubes have been widely used in foundation pit engineering, but their mechanism of uplift bearing capacity remains unclear. According to its supporting principle, three failure modes and four loading stages of soil nails of steel tubes were analyzed. Based on the Coulomb earth pressure theory, a calculation formula for the uplift bearing capacity of the soil nail of a steel tube was derived by taking the gravity of the soil above the sliding soil as uniformly distributed loads. By taking a foundation pit in Lanzhou as an example, the calculation method for the ultimate uplift bearing capacity of soil nail of steel tube introduced in the Technical Specification for Retaining and Protection of Building Excavations was proposed in this paper, and the results of the uplift test were compared and analyzed. Results show that in the failure mode of the soil nail of the steel tube, the bolt body is pulled off, and the anchor body is cut off. In addition, the deformation of soil in front of the anchor is large. The four stress stages include stationary, plastic zone generation, plastic zone expansion, and failure stages. The proportion of uplift provided by the slurry anchor body increases significantly with an increase in the embedded depth of the steel pipe, which is an important component of the ultimate uplift bearing capacity of the soil nail of a steel tube.

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History
  • Received:October 10,2020
  • Online: June 15,2023
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