长大上坡沥青路面抗剪强度设计方法研究

Study of the Shear Strength Design Method for the Long-uphill Asphalt Pavement

为了研究多种因素与长大上坡沥青路面面层内部剪应力的关系,以我国高速公路最常见的二轴车和四轴车为例,通过分析沥青路面剪切流动变形及影响因素,建立了一种移动荷载下长大上坡沥青路面的动力学响应模型.基于正交试验方法对多变量进行了交叉组合计算,通过对计算结果的分析,建立了包括载重、速度、坡度和温度等主要影响因素的长大上坡沥青路面最大横向剪应力综合计算模型.根据长大上坡路段的受力特点,建议在长大上坡沥青路面的设计和施工中增加面内最大剪应力和路面材料抗剪强度控制指标,并给出了多因素综合影响下的长大上坡沥青路面车辙预测模型.

In order to study the relationship between the shear stress in the surface layer of long-uphill asphalt pavement and multiple factors,by analyzing the shear flow deformation with the affecting factors of asphalt pavement,a dynamic response model of the long-uphill asphalt pavement under moving load was established which took the most common two-axis vehicle and four-axis vehicle on highway in China as examples in this paper. The multivariate cross combinations calculation was conducted with reference to the orthogonal test method. By the analysis of the calculated results,a maximum transverse shear stress comprehensive calculation model of the long-uphill asphalt pavement was proposed which included main affecting factors such as axle load,speed,slope and temperature. According to the mechanical characteristics of the long-uphill pavement,it is suggested that the maximum shear stress in the surface layer and the shear strength of the pavement material should be added as control indexs in the pavement design and construction. A comprehensive rutting prediction model under the influence of many factors was proposed.