不同结构沥青混合料反射裂缝数值模拟与比较  

Numerical simulation and comparison of reflective cracking in different structures of asphalt mixture

作　　者：曹青青[1] 黄晓明[1] 刘修宇[1] 刘琬辰[1] 

机构地区：[1]东南大学交通学院,江苏南京210096

出　　处：《江苏大学学报（自然科学版）》2017年第1期103-108,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51378121)

摘　　要：为了得到不同结构下的沥青混合料中反射裂缝的发展情况,将密实悬浮、骨架密实和骨架空隙这3种结构的沥青混合料小梁生成数字试件,并运用扩展有限元方法(XFEM)数值模拟进行虚拟试验,得到裂缝在沥青混合料中自下而上反射扩展的过程,同时选取AC,ATB,SMA和LSPM等4种典型沥青混凝土材料,考察其抵御反射裂缝的能力.通过对比分析4种典型沥青混凝土材料中裂缝在密实悬浮、骨架密实和骨架空隙3种结构中的扩展路径和沥青混合料在不同裂缝扩展阶段下的力学响应,发现沥青混合料的骨架结构越明显,裂缝开展的最大位移和最终长度越小,裂缝发展最后阶段最大主应力越小,裂缝越不能自由发展.因此,骨架结构可以有效减少反射裂缝,提高材料的抗反射裂缝能力.In order to get the development of reflective cracking in different structures of asphalt mixture, the extended finite element was used to realize numerical simulation of three typical structures of suspension-dense,framework-dense and void-skeleton.The bottom-up process of cracking in asphalt mixture was obtained,while the anti-reflective properties of four typical crack asphalt materials of AC, ATB,SMA and LSPM were analyzed.The propagation paths of crack and the mechanical responses at different crack extension stages in three structures were compared.The results show that the more obvious the skeleton structure of asphalt mixture is,the shorter the crack mouth opening displacement and the crack length are,and the lower the maximum principle of the last period is.The skeleton structure can effectively reduce the reflective cracking and hinder crack development.

关 键 词：典型沥青材料 沥青混合料结构 反射裂缝 数值模拟 扩展有限元 

分 类 号：U416.217[交通运输工程—道路与铁道工程]