混合式基层沥青路面结构应力、应变特性及经济性分析

基于我国沥青路面设计理论及标准,拟定了3种混合式基层、一种典型半刚性基层与一种典型柔性基层共5种沥青路面结构,利用BISAR3.0程序对5种结构进行力学计算分析。主要针对5种路面结构的沥青层内最大拉应力、最大拉应变、路基顶面压应变、路表弯沉等力学指标进行深入对比分析,并根据疲劳寿命对各类基层进行了经济性分析。数据分析结果表明：通过合理的设计,混合式基层结构在力学性能上可以较典型半刚性基层和柔性基层结构更加优秀,虽然从单价上来讲,经济性能上不如半刚性基层,但考虑路面疲劳寿命性价的话,采用沥青稳定碎石作为上基层的混合式基层可以优于半刚性基层,这为今混合式基层沥青路面结构的应用推广提供了重要的参考。

Mechanical、Economic and Budget Analysis of Asphalt Pavement Structure on Mix Base

Based on asphalt pavement design theory and criterions in China,five asphalt structures are put out,including three mix base pavement structures,one typical semi-rigid base pavement structure and one typical flexible base pavement structure.For contract study,different pavement structures were selected with various combinations of modulus and Poisson ratio,but the total thickness is same for comparative analysis.The stress-strain at different depth in asphalt layer is calculated by using BISAR program.The data analysis is carried out for the maximum tensile stress,and the maximum strain of asphalt layer,and the maximum compressive strain on top of sub grade,deflection on asphalt surface.And budget basis price for base is contrasted too.The data analysis results show that the mix base asphalt pavement structures can be designed to get better pavement mechanical performance than typical semi-rigid base and typical flexible base asphalt pavement structures,while the price is higher than semi-rigid base.If thinking over fatigue life,the cost performance for mix base of upper base with asphalt stabilized macadam is the best.This gives out the important reference for widespread the mix base in future.