沥青路面基-面层间结合状态对路面应力响应的影响分析

Influence of Bonding Condition between Base and Surface Courses of Asphalt Pavement on Pavement Stress Response

为研究基层与面层间结合状态的失效对沥青路面内部结构应力响应和路面结构使用寿命产生的不利影响,采用BISAR3.0计算软件对不同基-面层间结合状态下沥青路面基-面层间的正应力、剪应力和相对位移突变进行分析。结果表明,基-面层间结合状态的缺失将直接导致层底拉应力和基-面间最大剪应力的大幅突变,且极有可能引起层间相对累积滑移;基-面层间不同计算点位处应力突变对层间接触状态的敏感程度有所差异,其中越靠近车轮作用中心位置,层间结合状态对应力突变的影响越大;层间滑移随着粘结作用的不断失效而增长,且其失效程度越高,相应其滑移累积越快,当层间结合状态简化柔量系数ALK>18时,基-面层间相对位移出现迅速增长。

In order to study the adverse effect of worse bonding conditions between base and surface courses on stress response of inner pavement structure and the pavement serving life, an analysis on the normal stress, shear stress and relative displacement mutation caused by the changes of bonding condition between base and surface courses was made with the calculation software BIS R3.0. The results show that （ 1 ） the worse bonding conditions would lead to a strong mutation on the tension stress of bottom of layer and the maximum shear stress between base and surface courses directly, and may cause the accumulation of relative slippage in the interlayer; （2） it is diversity for susceptibility degrees of stress mutation at different calculation points between base and surface course to different interlayer contacts, and the point around the centre of wheel is considered to be the most susceptive; （3） the slippage between base and surface courses increases with the bonding ability decreasing, and the slippage becomes more and more severe with the bonding ability losing. The relative displacement increases dramatically when the simplified compliance parameter value ALK is more than 18.