考虑交通横向分布的路基永久变形预估分析

以典型路基土室内永久变形试验结果得到永久变形预估模型参数；根据交通类型、车道宽度等因素将车辆轮迹横向分布简化为4种形式；采用分条分层总和法对3种交通横向分布频率、3种路面结构组合形式下的路基永久变形进行了计算.结果表明：在道路横断面上,路基永久变形可以用一条向下凹的盆状曲线进行描述,且永久变形的最大值及产生位置与各自的交通横向分布形式相一致；路基内不同深度处各亚层路基土永久变形值随着路基深度增加而均匀递减,路基模量的衰减将引起路基内相同位置处的应力应变增大.

Estemate Analysis of Subgrade Permanent Deformation Considering Traffic Transverse Distribution

Permanent deformation prediction model parameters was determined by taking a typical subgrade soil interior permanent deformation test.vehicle wheel trace transverse distribution simplified as four forms according to the traffic types,lane width,etc.Subgrade permanent deformation was calculated under the cases of three kinds of traffic transverse distribution frequency and three kinds of pavement structure combination form using the itemize and layerwise summation method.The results show that,on the cross section of road,subgrade permanent deformation could described as a down concave curve in the form of a basin.the maximum value of subgrade permanent deformation and its appear position was consistent with its traffic transverse distribution form.Each sublayer permanent deformation at different depth in the subgrade internal was uniform decline while depth increased.Attenuation of subgrade modulus of resilience caused stress（strain）increase in the same position in subgrade internal.