| 车轮荷载下路基和基底竖向应力计算 |
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| 引用本文： | 牛玺荣,韩萍,张晓燕.车轮荷载下路基和基底竖向应力计算[J].长安大学学报(自然科学版),2011(1). |
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| 作者姓名： | 牛玺荣 韩萍 张晓燕 |
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| 作者单位： | 长安大学特殊地区公路工程教育部重点实验室;山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室; |
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| 基金项目： | 山西省交通科技项目(08-05) |
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| 摘 要： | 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(25 kN和0.7 MPa)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3 m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3 m;在路基填高大于5 m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1 m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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| 关 键 词： | 道路工程 路基 基底 竖向应力 计算 |
Calculation of vertical stress in subgrade and foundation base under wheel load |
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| NIU Xi-rong,HAN Ping,ZHANG Xiao-yan.Calculation of vertical stress in subgrade and foundation base under wheel load[J].JOurnal of Chang’an University:Natural Science Edition,2011(1). |
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| Authors: | NIU Xi-rong HAN Ping ZHANG Xiao-yan |
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| Institution: | NIU Xi-rong1,2,HAN Ping2,ZHANG Xiao-yan2(1.Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,Shaanxi,China,2.Key Laboratory for Loess Area Highway Construction & Maintenance Technology of Ministry of Transport,Shanxi Province Communications Scientific Research Institute,Taiyuan 030006,Shanxi,China) |
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| Abstract: | In order to verify the bearing capacity of the special filler(such as soft rock,weathered rock,artificial materials) under the special traffic loads(such as overloading),on the premise of the standard wheel loads(25 kN and 0.7 MPa),considering the variations of the non-standard traffic loads and the backfill density,the vertical stress in subgrade and foundation base were calculated under concentrated wheel load and distributed wheel load.Because of the difference of compressive modulus between pavement mat... |
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| Keywords: | road engineering subgrade foundation base vertical stress calculation |
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