旧沥青路面加铺温度及耦合应力分析  

Analysis of Thermal and Coupled-filed Stresses of Overlay on the Old Asphalt Pavements

作　　者：江毅 华建湘 颜可珍[2] 黄立葵[2] 

机构地区：[1]湖南省衡岳高速公路建设开发有限公司,湖南衡阳421900 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《公路工程》2010年第1期1-4,8,共5页Highway Engineering

基　　金：国家自然科学基金资助(50808077);中国博士后科学基金资助(20070411113)

摘　　要：基于旧沥青路面加铺沥青面层的结构特点,利用有限元法对不同降温条件的加铺路面温度及耦合应力进行了分析,研究不同降温幅度、起始温度、加铺厚度时的变化规律,并着重计算了旧路裂缝对耦合应力的影响。计算结果表明:耦合使拉应力变小,但可能导致剪应力变大;降温速度与起始温度对加铺层耦合应力影响显著;增加加铺厚度在一定程度上可以缓解加铺层耦合应力;设计和施工中应该考虑旧路裂缝对加铺层的影响。In order to simulate the thermal and coupled-field stress responses of overlay on old asphalt pavements, a model under different cooling conditions is built, and then the model were analyzed by using finite element software. In the analysis process, the influence of cooling range, initial tempera- ture , thickness of overlay were represented. And then the influence of cracks which existence in old pavement were emphatically analyzed. The results indicate that, coupled-field can decrease tensile stress but may increase shear stress. Initial temperature and cooling speed take a distinctly effect on the stress of overlay pavement. Addition of thickness can improve the stress characteristics of overlay. More attention should be pay attention to existence of cracks during the overlay design and construction.

关 键 词：沥青加铺层 有限元法 温度应力 耦合应力 

分 类 号：U416.22[交通运输工程—道路与铁道工程]