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工程力学  2012 

基于分形理论的人工挖孔嵌岩桩承载特性分析

DOI: 10.6052/j.issn.1000-4750.2011.02.0097, PP. 127-133

Keywords: 嵌岩桩,承载特性,分形理论,侧摩阻力,桩端荷载分担比

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Abstract:

嵌岩长桩的承载性能主要取决于桩-岩接触面的剪切强度。基于岩体结构面强度的研究方法,引入分形维数描述的两相接触介质粗糙表面的抗剪强度公式,建立了以分维数表示的嵌岩桩侧摩阻力传递模型,求得了弹性条件下的桩侧摩阻力及桩身轴力的解析式。基于所获得的解答,深入地探讨了分形维数D对桩侧摩阻力?、桩身轴力P及桩端荷载分担比Pb/Pd的影响规律。研究表明:同等条件下一定范围内粗糙分维值D越大,桩侧摩阻力在桩身上部分布越集中,荷载传递深度越小,桩端荷载分担比Pb/Pd也越小;长径比l/d越小,桩端荷载分担比越大,反之越小。工程算例对比分析表明:理论计算与实测结果吻合较好,对嵌岩桩设计有一定参考价值。

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