不同结构沥青混合料反射裂缝数值模拟与比较

发布时间：2018-11-21 10:04

【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.
[Abstract]:In order to obtain the development of reflection cracks in asphalt mixture with different structures, the trabeculae of asphalt mixture with dense suspension, dense skeleton and skeleton void are formed into digital specimens. Using extended finite element method (XFEM) to simulate virtual test, the process of crack propagation from bottom to top in asphalt mixture is obtained. Four kinds of typical asphalt concrete materials, AC,ATB,SMA and LSPM, are selected at the same time. Its ability to resist reflective cracks was investigated. By comparing and analyzing the propagation paths of four typical asphalt concrete materials, the crack propagation paths and the mechanical responses of asphalt mixture under different crack propagation stages, the crack in the dense suspension, the skeleton dense and the skeleton voids are analyzed. It is found that the more obvious the skeleton structure of asphalt mixture is, the smaller the maximum displacement and final length of crack are, the smaller the maximum principal stress in the final stage of crack development is, the less the crack can develop freely. Therefore, the skeleton structure can effectively reduce the reflection crack and improve the ability of the material to resist the reflection crack.
【作者单位】：东南大学交通学院;
【基金】：国家自然科学基金资助项目(51378121)
【分类号】：U414

【参考文献】