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砂土地基中开挖过程对立柱桩的影响分析

DOI: 10.6052/1000-0879-13-277, PP. 59-63

Keywords: 深开挖,空间效应,桩身拉力,桩顶回弹

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Abstract:

立柱桩对基坑工程的稳定性有重要影响.基于快速拉格朗日法(fastLagrangiananalysisofcontinua-3D,FLAC3D),考虑桩土之间的相对滑移作用,深入分析了砂土地基中开挖条件下不同布桩方式对立柱桩桩身拉力、最大拉力位置及桩顶回弹量等的影响.结果表明开挖对立柱桩的影响有明显的空间效应,开挖对中心桩的影响最大,角桩最小;开挖使立柱桩桩身内产生了拉力,群桩基础内的中心桩最大拉力值大于单桩的最大拉力值,且最大拉力值位置随桩数的增加而上移,并最终稳定在0.5倍的有效桩长;中心桩桩顶回弹量先随着桩数的增加而增大,然后当桩数增加到一定的数量后减小.

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