长寿命沥青路面结构组合分析

Research on Structure Combination of Long Life Asphalt Pavement

提出了寿命沥青路面的设计指标:沥青层底最大拉应变、土基顶面最大压应变及考虑路面抗剪能力的路面结构车辙深度;同时采用三维有限元方法对半刚性基层及柔性基层两种形式的长寿路面结构进行分析,分析中材料参数采用路面各结构层的实测结构模量,最后根据力学分析结果对拟定结构的设计指标进行验算。分析结果表明,半刚性基层长寿路面最大拉应变发生在沥青层顶面附近,而柔性基层路面最大拉应变出现在沥青层底面,剪应力在两种形式长寿路面中的分布形式也有很大差别。

The paper advanced 3 indexes for the design of long life asphalt pavements： maximal tension strain at the bottom of asphalt pavement,maximal compression strain at the top of subgrade and rutting depth of asphalt pavements.Afterwards,it analyzed 5 long life asphalt pavement structures,including long life asphalt pavements with flexible base and long life asphalt pavements with semi-rigid base,and real parameters were used in the analysis.Finally,checking computations of the design indexes were done based on the results.The analysis indicated that,the location of maximum tension strain of long life asphalt pavements with semi-rigid base is near the top of asphalt pavement,but the location of maximum tension strain of long life asphalt pavements with flexible base is at the bottom of asphalt pavement;and the shear stress distribution is also different in the 2 kinds of pavements.