层间接触条件对沥青路面力学响应的影响  

Impact of interlayer condition on mechanical response of asphalt pavement

作　　者：张艳红[1,2] 王晓帆 

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]中国公路工程咨询集团有限公司,北京100097 [3]中交一公局公路勘察设计院有限公司,北京100024

出　　处：《长安大学学报（自然科学版）》2012年第5期7-11,33,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：陕西省交通厅科技项目(KJYF-2008/JT03)

摘　　要：中国现行沥青路面设计以路表弯沉、沥青层底及半刚性层底拉应力为设计指标,层间条件假定完全连续。实践中路面分层修筑,层间不完全连续,对路面结构受力状态影响甚大。以京津塘高速公路改扩建工程为依托,假定层间完全连续与层间不完全连续2种状态,以壳牌计算软件Bisar 3.0和数值软件Matlab 7.0分析了3类常见沥青路面在2种层间接触条件下的三维力学响应分布及最不利受荷点。结果表明:层间结合不连续导致结构内应力、应变骤增;各类路面在不同层间状态下出现最大应力及应变的位置不同;2种层间条件下复合式路面的响应均居于柔性与半刚性路面之间;路面结构设计时,应在现行规范的基础上,对层间不完全连续状态下指定点位处的力学指标进行验算,为路面在运营期内的可靠度分析提供依据。The current asphalt pavement designing standards in China adopt deflection on the surface of road,flexural stress on the bottom of asphalt layer and flexural stress on the bottom of semi-rigid layer as the main designing indexes with the interlayer binding condition assumed to be totally continuous.Actually,the pavement structural layers are built respectively and the interlayer condition is incompletely continuous,which affects the mechanical response of pavement structure greatly.With Beijing-Tianjing-Tangshan expressway upgrading project as an example and two types of interlayer conditions considered,Bisar3.0 under shell design system and numerical software Matlab 7.0 were used to describe the 3-D mechanical responses and determine the maximum stress point on three kinds of common asphalt pavement.The results show that stress and strain of the structure greatly increase under discontinuous interlayer condition.The sites of maximum stress and strain are different under the two types of interlayer condition of the three kinds of pavement.The mechanical response of compound pavement is between the flexural pavement and the semi-rigid pavement.It＇s suggested that the analysis of mechanical responses at specified point under discontinuous interlayer condition is significant and necessary for designing the pavement structures,which can provide basis in the reliability evaluation in the project circle.

关 键 词：道路工程 沥青路面 层间结合条件 力学响应 剪应力 拉应变 

分 类 号：U416.217[交通运输工程—道路与铁道工程]