柔性半掏挖基础上拔承载力模型试验及计算理论

doi:10.13722/j.cnki.jrme.2018.1209

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摘要根据柔性半掏挖基础具有良好抗拔性能，适用于原状土土性较好且地下水位较深的地质条件的特点，以土性参数、深径比及锥体扩展角为参数，设计并制作4组原状土新型基础试验模型，开展其上拔稳定承载力试验；试验得到新型基础在上拔荷载下分为弹性段、弹塑性非线性段、直线破坏段3个变形阶段，以及最终地面土体隆起开裂的破坏形态。同时，开展不同场地土性参数下新型基础上拔稳定承载力特性的非线性模拟分析，考察柔性半掏挖基础与传统基础上拔荷载–位移特性及传力机制的差异。最后，对比土重法和剪切法2种计算理论的差异，当新型掏挖基础的深径比较大时，采用土重法计算承载力比剪切法计算值大20%以上且趋于不安全；基于土体剪切法圆弧面滑动面假设的上拔承载力计算理论，验证了上拔承载力理论计算值与试验值及模拟值吻合良好。

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	谢芳1
	冯炳2
	王震球3
	张大长3

关键词 ：基础工程, 柔性半掏挖基础, 模型试验, 上拔承载力, 设计理论

Abstract：According to the characteristics of good uplift resistance of flexible semi-excavated foundation，which is suitable for better undisturbed soil and deeper underground water level condition，the uplift bearing capacity of the new type of foundation was studied. Considering different soil properties，depth-diameter ratio and cone spreading angle of new foundation，4 sets of test models of undisturbed soil were designed and manufactured，and the uplift stable bearing capacity tests were carried out. Tests results show that deformation of the foundation due to the uplift load experiences three distinct stages such as linear，elastic-plastic and failure stages and that the foundation fails in the form of the upheaval of the ground soil. The nonlinear behavior of uplift stable bearing capacity of the new flexible semi-excavated foundation was simulated，and the difference of deformation characteristics and force transfer mechanisms of the new foundation and the traditional excavated foundation was analyzed. Comparisons between soil weight method and shear method were performed. It is shown that，under the condition of a large depth-diameter ratio，the bearing capacity calculated by the soil weight method is 20% larger than that obtained by the shear method and hence，the soil weight method is unsafe. The calculation theory of the uplift bearing capacity of the new foundation was proposed based on the hypothesis of soil arc sliding surface considering the shear method，and the theoretical method of the uplift bearing capacity of the foundation was verified by test and simulation results.

Key words： pile foundations flexible semi-excavated foundation model test uplift bearing capacity design theory

引用本文:

谢芳1，冯炳2，王震球3，张大长3. 柔性半掏挖基础上拔承载力模型试验及计算理论[J]. 岩石力学与工程学报, 2019, 38(5): 1041-1052.
XIE Fang1，FENG Bing2，WANG Zhenqiu3，ZHANG Dachang3. Model tests and calculation theory of the uplift bearing capacity of flexible semi-excavated foundations. , 2019, 38(5): 1041-1052.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1209 或 http://www.rockmech.org/CN/Y2019/V38/I5/1041

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