基于剪切弹性柔量的基-面层间接触状态及路面力学响应分析  

Analysis of Interlayer Contact Condition between Base and Mechanical Response of Asphalt Pavement and Surface Course Based on Shear Elastic Compliance

作　　者：张久鹏[1] 武书华[1] 裴建中[1] 李彦伟[2] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]石家庄市交通运输局,河北石家庄050051

出　　处：《公路交通科技》2013年第1期6-11,16,共7页Journal of Highway and Transportation Research and Development

基　　金：交通运输部应用基础研究项目(2011319812020);陕西省自然科学基础研究计划重点项目(2010JZ009);教育部"创新团队发展计划"(IRT1050);中央高校基本科研业务费专项资金项目(CHD2012JC002)

摘　　要：为研究半刚性基层与沥青面层的层间接触状态对路面结构力学响应和疲劳寿命的影响,选取典型半刚性基层沥青路面结构,采用Bisar3.0软件中的剪切弹性柔量参数AK作为基-面层层间接触状态的评价指标进行路面结构力学计算,分析不同层间接触状态下沥青路面结构的应力、应变、弯沉等力学指标的变化规律,并计算了层间不同接触状态下路面结构的疲劳寿命。结果显示:剪切弹性柔量可以较好的表征基-面层层间接触状态;弯拉应力和剪应力受基-面层间接触状态的影响较大,当基-面层间接触状态由连续变为滑动时,沥青层底弯拉应力的涨幅为528.25%,沥青层底剪应力的涨幅为157.3%,而弯沉受基-面层间接触状态的影响较小;基-面层间保持连续的接触状态可以提高层间抗剪切能力,延长路面的使用寿命。In order to research the influence of the contact condition between semi-rigid base and asphalt surface course on the mechanical response and the fatigue life of pavement structure, typical pavement structure with semi-rigid base is chosen and the shear elastic compliance AK from the software Bisar3.0 is used as the evaluation index of the interlayer contact condition to conduct mechanical calculation of the pavement structure and analyze the change regularity of stress, strain, deflection of the pavement structure under different contact conditions is calculated, and the fatigue life of the pavement structure is calculated under different contact conditions. The results show that （1） The shear elastic compliance could better characterize the interlayer contact condition between base and surface course. （2） The interlayer condition has a significant impact on the flexural tensile stress and shear stress. When the interlayer condition is changed from continuous state into sliding state, the growth rate of the flexural tension stress at bottom of the asphalt layer is 528.25% and the growth rate of shear stress is 157.3%, While the interlayer condition has a smaller impact on the deflection. Keeping the completely continuous interlayer condition between base and surface course can improve the anti-shear ability and prolong service life of pavement.

关 键 词：道路工程 层间接触状态 剪切弹性柔量 力学响应 疲劳寿命 

分 类 号：U416.217.01[交通运输工程—道路与铁道工程]