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嵌岩灌注桩因其诸多优点在桥梁等工程领域中广泛使用,但当上覆土层软弱且桩顶自由长度较大时,桩身屈曲稳定问题应引起重视。为探讨桩侧土约束对桩身屈曲稳定的影响,假定地基反力系数呈更一般的幂分布,基于弹性地基梁理论建立桩土体系总势能方程,采用最小势能原理导得桩身屈曲临界荷载与计算长度解答,并据此讨论了地基反力系数分布模式、桩身自重及桩侧摩阻力等对桩身屈曲稳定的影响规律。这些定性的规律对嵌岩灌注桩的设计与施工具有一定的指导意义。
Because of its many advantages, rock-socketed cast-in-place piles are widely used in engineering fields such as bridges. However, when the overburden is weak and the free length of pile top is large, the buckling stability of pile body should be taken seriously. In order to investigate the effect of pile lateral constraint on the buckling stability of pile, assuming that the foundation reaction coefficient is a more general power distribution, the total potential energy equation of pile-soil system is established based on the elastic foundation beam theory and the critical buckling load And the calculation of the length of the solution, and then discussed the foundation of the reaction coefficient distribution model, pile self-weight and pile side friction resistance of the pile buckling stability. These qualitative laws have some guiding significance for the design and construction of embedded rock piles.