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横向荷载对基桩竖向承载力的影响分析

, PP. 44-48

Keywords: 道路工程,竖向承载力,弹性理论,横向荷载,m法

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Abstract:

为研究横向荷载对基桩竖向承载力的影响,首先利用m法假设下轴横向受荷桩桩身挠曲方程的幂级数解,得到桩周土对桩身抗力沿桩轴向的分布,在此基础上利用横向受荷桩桩侧土体应力分布弹性解,求得桩周所受法向压力的变化量,进而得到桩侧阻力极限值的变化量沿桩轴向的分布,将此变化量积分得到由横向荷载引起的桩侧极限摩阻力的变化量,由于横向荷载对桩端阻力影响不大,故此即为基桩竖向承载力的变化量,横向受荷桩的竖向承载力即为此变化值与无横向荷载作用时基桩的竖向承载力之和。然后将导得的计算公式对某试验进行分析,其结果表明计算值与实测值吻合较好,最后对横向荷载下基桩极限侧阻力变化量的影响因素进行了分析。分析结果进一步证明了横向荷载对基桩竖向承载力有一定影响,在工程设计中值得注意。

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