沥青路面裂纹扩展数值模拟及影响因素分析

Numerical simulation of asphalt pavement crack propagation and analysis of influence factors

应用线弹性断裂力学理论结合同时考虑交通与温度载荷的有限元方法来研究沥青路面裂纹扩展路径.采用1/4等参奇异性单元模拟裂纹尖端的应力奇异性,运用窗口移动技术模拟裂纹扩展路径,并发展了沥青路面裂纹扩展模拟程序.应用该程序模拟了不同荷载作用位置下路面结构中表面和基层底面裂纹的扩展情况,同时研究了路面结构层模量组合对沥青路面裂纹扩展的影响.模拟表明,该方法能较好地模拟裂纹扩展行为,有助于更好地了解沥青路面的开裂行为.

In order, r to study asphalt pavement crack propagation paths, the linear elastic fracture mechanics（LEFM） theory and finite dement method（FEM） that incorporate traffic load and temperature stress are used in this paper. Using quarter point collapsed singular isoparametric dement, the stress singularity at the vicinity of crack tip is simulated. The crack propagation paths,hs are simulated by using window moving technique（WMT）. Based on these, an asphalt pavement crack propagation paths simulation（APCPPS^20） program is developed. Under the various load location cases, the crack propagation behavior of surface crack and base bottom crack are simulated using APCPPS^20. The influences of layer modulus combination on pavement cracking are studied. The simulation results indicate that this method can simulate crack propagation paths and help to understand crack behavior of asphalt pavement in a better way.