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考虑土拱效应的双排抗滑桩桩侧土压力计算

Keywords: 道路工程,双排抗滑桩,桩侧土压力,土拱效应,有限差分,内力分析

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Abstract:

分析了双排抗滑桩结构承载的最不利状态。首先考虑纵向桩间土拱成拱机理,利用土拱抛物线拱轴线的几何特征及拱脚处的力平衡及应力状态,导出作用于双排桩桩侧的坡体土压力分布;然后针对双排抗滑桩桩间土体有限边界特点,通过对桩间土不同区域分别采用薄层单元法对土压力的分布模式进行求解,导得桩间土作用于双排抗滑桩桩侧土压力分布,由此得出了最不利受力状态下双排抗滑桩桩侧土压力计算方法。将其应用于双排抗滑桩内力分析计算,得出了双排桩桩身内力计算的有限差分算法。试验数据对比表明,该方法计算结果与实测数据较为接近,可供双排桩设计参考。

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