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Volume 41 Issue 2
Mar.  2022
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Article Navigation >  Bulletin of Geological Science and Technology  > 2022  >  41(2): 335-342
Zhang Xueli, Cui Qiang, Zhang Shulin. Experimental research on uplift bearing capacity of the assembled foundation with cone tube and slab in frozen subsoil[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 335-342. doi: 10.19509/j.cnki.dzkq.2022.0050
Citation: Zhang Xueli, Cui Qiang, Zhang Shulin. Experimental research on uplift bearing capacity of the assembled foundation with cone tube and slab in frozen subsoil[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 335-342. doi: 10.19509/j.cnki.dzkq.2022.0050
shu

Experimental research on uplift bearing capacity of the assembled foundation with cone tube and slab in frozen subsoil

doi: 10.19509/j.cnki.dzkq.2022.0050
  • Received Date: 05 Feb 2021
    Abstract
  • Aiming at the scientific problem of transmission line foundation freeze-thaw failure in frozen subsoil, this paper takes an assembled foundation with cone tubes and slabs as the research object. The research method of the indoor model test and analysis is adopted, and a series of freezing tests and uplift loading tests of the model foundation are carried out under different ambient temperatures. The distribution characteristics of the temperature field and displacement field of the foundation and the relationship between the ultimate uplift capacity and temperature are analysed. Simultaneously, the failure mode of the frozen soil foundation under uplift load is also revealed. The research results show that in the freezing test, the displacement of the model foundation is less than the frost heave displacement of the surrounding foundation soil; the closer the distance from the foundation is, the stronger the frost heaving anti-restraint effect of the foundation is.In the uplift loading test of the foundation under different freezing ambient temperatures, the ultimate uplift capacity increases approximately linearly with the decrease in the ambient temperature, and the increase rate is close to 1.8 kN/℃. Under the double action of freezing and uplift, the foundation soil first exhibits local tensile failure, and with the increasing uplift load, the foundation soil gradually transitions from local tensile failure to overall shear failure. The results of this paper can provide a theoretical basis and practical experience for the application of this type of foundation in frozen subsoil.

     

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