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桩承式多层水平加筋复合地基受力与变形分析

, PP. 29-34

Keywords: 道路工程,复合地基,桩土应力比,路堤,多层水平加筋体

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Abstract:

主要研究桩承式多层水平加筋复合地基中桩土应力比和桩土沉降。通过建立内外土柱受力变形模型和引入剪切位移法研究了水平加筋体的变形和应力传递规律,并基于内土柱微元体力平衡条件,推导出了桩土应力比n、差异沉降等计算公式。通过工程实例的分析计算,验证了公式的可靠性,分析了各影响因素与桩土应力比的关系。结果表明随着桩土沉降差Δs的增大,n也变大;随着内摩擦角φ的增大,n是先增大后减小,且当φ=30°时,n达到最大值;n与粘聚力c基本呈线性关系,与桩间距L近似呈双曲线关系。这与工程实例测试结果较为吻合。

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