超大直径变截面空心桩的荷载传递特征与理论模型

doi:10.13722/j.cnki.jrme.2018.0169

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摘要一种适用于串珠状溶洞地层的超大直径变截面空心桩的荷载传递机制较为复杂。基于超大直径变截面空心桩的荷载传递特征，重点研究变截面处变阶阻对侧阻的增强效应，同时基于扰动状态理论，提出适用于超大直径变截面空心桩的荷载传递函数模型。首先，利用半无限空间体明德林解推导变截面处变阶阻对侧阻力增大系数的表达式，并结合工程算例，通过对比提出的理论解析方法、软件数值解以及2种既有解析算法的结果，论证该算法的可靠性。而后，选取双曲线模型与抛物线模型分别描述桩侧与桩端接触相对完整状态，选取莫尔–库仑模型描述完全调整状态，系统构建桩–土界面荷载传递函数模型，通过编程计算分析模型参数对模型曲线的影响规律，同时结合工程实例进行计算模型的有效性检验。结果表明，超大直径变截面空心桩变截面处的变阶阻对侧阻具有显著的增强效应，基于扰动状态理论的荷载传递函数模型可较好描述桩–土相互作用的的非线性力学特征，采用上述方法计算变截面处的侧阻的增强效应具有较好的适用性，为超大直径变截面空心桩的应用推广提供了可靠的理论依据。

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	黄明1
	江松1
	许德祥2
	邓涛1
	上官兴1
	3
	方焘3

关键词 ：桩基础, 超大直径变截面桩, 扰动状态理论, 荷载传递, 非线性

Abstract：A new kind of step tapered hollow pile with huge diameter was successfully applied in the stratum with bead-like karst caves. The load transfer mechanism of the pile is complicate. According to the analysis of the load transfer characteristics of the pile，the effect of enhancement of the resistance at variable cross-section to the shaft resistance was revealed. A new load-transfer function model for step tapered hollow pile with huge diameter was proposed on the basis of disturbed state theory. The bearing capacity at variable cross-section was analyzed，and the enhancement effect of shaft resistance caused by the end resistance was presented. An approach for calculating the enhancement coefficient was proposed on the basis of Mindlin?s solution in semi-infinite space. The proposed analytical solution was verified by comparing with the numerical results and two existing analytical solutions. In the new load transfer model，the hyperbolic model and parabola model were selected to describe the relative intact state of pile-soil interface located on the pile side and the pile tip respectively，and Mohr-Coulomb model was used to assume the fully adjusted state. Thus，the load-transfer function model of pile-soil interface was proposed systematically. The effect of the model parameters was analyzed numerically. The proposed calculation model was found to be an excellent to describe the behavior of the step tapped hollow pile with large diameter. The resistance at variable cross-section has a significant enhancement effect on the shaft resistance. The load transfer function model based on the Disturbed State Concept theory can describe the nonlinear，hardening and softening characteristics of pile-soil interface. The enhancement effect of the shaft resistance caused by the resistance at variable cross-section can be revealed obviously.

Key words： pile foundations step tapered hollow pile with huge diameter disturbed state concept theory load transfer nonlinear

引用本文:

黄明1，江松1，许德祥2，邓涛1，上官兴1，3，方焘3. 超大直径变截面空心桩的荷载传递特征与理论模型[J]. 岩石力学与工程学报, 2018, 37(10): 2370-2383.
HUANG Ming1，JIANG Song1，XU Dexiang2，DENG Tao1，SHANGGUANG Xing1，3，FANG Tao3. Load transfer mechanism and theoretical model of step tapered hollow pile with huge diameter. , 2018, 37(10): 2370-2383.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0169 或 http://www.rockmech.org/CN/Y2018/V37/I10/2370

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