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圆形浅基础地基极限承载力理论公式的改进

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Keywords: 道路工程,地基极限承载力理论解,极限平衡法,圆形浅基础,摩尔-库伦屈服准则

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Abstract:

针对已有圆形浅基础地基极限承载力计算方法的假定条件、计算方法、屈服准则等的适应性特点,对圆形浅基础地基极限承载力的解析解进行了研究。假定地基整体剪切破坏面形态呈Prandtl-Reissner经典理论滑动面形状、地基土体破坏时为不变形的刚塑性体,且破坏面均服从Mohr-Coulomb屈服条件,根据刚塑性体的静力平衡条件,考虑破坏面上的摩阻力项,严格推导了圆形浅基础地基极限承载力的理论解,并与Vesic半经验公式以及其他解析解进行了对比,对比结果表明考虑破坏面上的摩阻力σtanφ项能使承载力系数Nc和Nq提高,但二者随内摩擦角的变化规律有差异;本文理论解与Vesic半经验公式以及其他解析解相似,是对圆形浅基础地基极限承载力计算方法的进一步改进。

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