辽宁省低等级公路半刚性基层沥青路面推移现象形成机理

目的 研究辽宁省低等级公路路面推移现象产生的机理,提出合理的防治该种病害的技术措施.方法 在对辽宁省低等级公路路面病害调查的基础上,运用有限元分析软件对基层和面层间的剪应力进行模拟计算,通过改变路面结构参数和行车荷载,得出了面层和基层层间剪应力变化的一般规律.结果 重载和车速在纵坡行驶时的频繁变化是导致路面推移现象的主要因素.与标准轴载的情况相比,超载100%时,其层间剪应力增大了56%.结论 建议应从设计和施工两个方面加强面层和基层的黏结,以便有效地控制低等级公路路面推移现象的频繁发生.

Mechanism of Slippage in Rural Road Surface:A Theoretical Research on Low-Graded Highway Asphalt Pavement in Liaoning Province

We study the mechanism of slippage in rural road surface in Liaoning Province from a theoretical point of view in order to find reasonable technical measures to handle problems aroused.On the basis of investigation into problems in the rural road surface of Liaoning Province,we simulated the shear stress between surface layer and base layer by finite element method(FEM),changed the pavement structure parameters and traffic load conditions,and found out that overloading and frequency of speed-changes in longitudinal slope driving were the main factors of forming slippage in asphalt pavement.Compared with standard loading,overloading of 100 percent makes the shear stress increases 56 percent.To prevent and solve the problem arising from slippage,we suggest strengthening the sticking between surface and base layer of asphalt pavement in both designation and construction.