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针对软土区顶部加箍碎石桩复合地基,根据理论上较为严密的极限分析上限法,通过构建协调的速度场,综合考虑土重和加箍段桩侧摩阻力等因素的影响,基于能量平衡原理推导出了单桩极限承载力递推计算公式。在此基础上,利用随机优化搜索方法搜索出临界滑裂面,从而获得更为合理、严密的顶部加箍碎石桩极限承载力计算方法。最后,结合典型的工程实例进行了对比验证和参数分析,结果表明:计算结果与实测值、既有方法计算值相比相对误差在5.4%范围内,最优顶部加箍深度约为桩体半径的8倍,可为工程实践提供一定的参考。
According to the theoretical upper bound method of limit analysis, aiming at the top of the soft soil area with the hoop-gravel pile composite foundation, through the construction of coordinated velocity field, considering the influence of soil weight and side friction resistance of the hoop section, The principle of equilibrium is deduced to derive the recursive formula of ultimate bearing capacity of single pile. On this basis, using the method of random optimization search to find out the critical slip surface, so as to get a more reasonable and rigorous method of calculating the ultimate bearing capacity of topped hoop pile. Finally, the comparison and verification with the typical engineering examples are carried out. The results show that the relative error between the calculated and measured values and the calculated values of the existing methods is within 5.4%, and the optimal top hoop depth is about the radius of the pile 8 times, can provide certain reference for engineering practice.