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针对工程实践中出现的顶部加箍碎石桩复合地基形式,分析了其破坏模式。引入滑块平衡法,考虑土体自重效应和加箍段桩侧摩阻力影响,分别基于计算深基础承载力的Meyerhof法和Terzaghi法,建立了顶部加箍碎石桩在深层鼓胀破坏模式下的两种计算模型,并利用随机优化算法搜索临界滑裂面及其所对应的极限承载力。通过与实验结果以及与既有方法的对比分析发现:本计算方法更符合工程实际,而且就承载力而言,顶部加箍碎石桩的最优加箍深度约为4倍桩体直径。
Aiming at the form of composite foundation with the top sheared stone columns appearing in the engineering practice, the failure modes are analyzed. By introducing the balance method of the slider and taking into account the soil self-weight effect and the lateral frictional resistance of the hoop section, Meyerhof method and Terzaghi method are used to calculate the deep foundation bearing capacity respectively. Two kinds of calculation models, and use the stochastic optimization algorithm to search the critical slip plane and its corresponding ultimate bearing capacity. By comparing with the experimental results and the existing methods, it is found that the calculation method is more in line with engineering practice, and the optimal hoop depth of the top plus hoop pile is about 4 times of the diameter of the pile in terms of bearing capacity.