极限平衡法计算砂土中条形基础的承载力
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南京林业大学土木学院

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TU432

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A limit equilibrium solution for bearing capacity of strip footing on sand
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College of civil engineering,Nanjing Forestry University,Nanjing,210037

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    摘要:

    通过理论计算确定浅基础的极限承载力是岩土学者研究的基本课题。由于推导中存在不同的简化,已有的承载力理论计算出的承载力并不相同。根据极限承载力分析的经典模型,采用极限平衡法推导出砂土上条形基础的承载力系数Nq和Nγ的计算公式。与已有常用方法相比,本次推导出Nq和Nγ计算公式相互独立从而减少了计算的不确定性。为验证公式的准确性,将计算结果与极限分析法的理论解答以及文献中的试验结果进行了对比。结果表明,相比几种常用的经典理论,使用本文公式计算出不同内摩擦角时的Nγ与极限分析法的计算值更加接近;使用本文公式计算出的极限承载力与试验数据也更接近。

    Abstract:

    Determination bearing capacity of shallow foundations has been extensively studied by geotechnical scholars. Since different simplifications exists in the deduction, the value of bearing capacity could produce large difference depending on the theory used. Based on the classical analytical model, a limit equilibrium analysis of strip footing on sand is used in this paper and the equations of bearing capacity factors Nq and Nγ are given. Compared to common used theory models, the equations of Nq and Nγ are independent thus reduce the uncertainty in calculation. In order to verify the accuracy of the equations, the calculation is compared with the theory solution of limit analysis and tests result in literature. Results indicate that the Nγ values calculated by the proposed equations of different internal friction angle are closer to solution of limit analysis than other theory models. Furthermore, the bearing capacity calculated by equations in this paper shows good agreement with the test data.

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历史
  • 收稿日期:2019-08-19
  • 最后修改日期:2019-12-04
  • 录用日期:2019-12-11
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