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圆形浅基础极限承载力分析

, PP. 35-38

Keywords: 道路工程,地基,极限分析法,极限承载力,上限定理,重力

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Abstract:

针对圆形浅基础地基承载力,采用极限分析法上限定理推导出圆形浅基础的承载力公式。公式推导过程中,考虑土体重力做的功,假定地基破坏模式服从普朗特尔滑动机构,滑动机构包括ABC、ADE刚体和ACD对数螺旋变形体3部分,并分别得到内能耗散率、重力功的功率、上覆土层能量消散率及外力的总功率,通过研究土体发生无限制塑性流动时的外部功率与内能耗散率求解出极限承载力。计算结果与地基承载力实测资料对比分析表明计算结果较参考文献计算值总体偏大,与实测值的误差控制在20%范围内,可为计算圆形浅基础地基承载力提供参考。

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