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车轮荷载下路基和基底竖向应力计算

, PP. 26-30

Keywords: 道路工程,路基,基底,竖向应力,计算

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Abstract:

为了验证特殊交通荷载(如超载)下特殊填料(如软岩、风化岩和人工材料)的承载力,在标准轮载(25kN和0.7MPa)前提下,考虑非标准轮载和路基填土重度的变化,分别计算了集中轮载和均布轮载作用下路基和基底内竖向附加应力和总应力计算均布轮载下路基内应力时,考虑了路面材料和路基材料抗压模量差异引起的应力扩散角的存在;计算基底内应力时,将路基作为条形基础,对路基中心下基底内不同深度处的应力进行了计算。计算结果表明标准均布轮载下产生的路基内附加应力较标准集中轮载要大,在路基深度大于3m时两者趋于相等;轮载变化对路基内竖向附加应力的影响较大,其影响深度约为3m;在路基填高大于5m时,标准集中轮载与标准均布轮载作用下基底总应力趋于同一值;在路基填高大于1m后,基底内某一深度处总应力与路基填高近似呈线性增长关系。

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