摘要
在我国高寒地区,普遍存在反射裂缝引起的路面破坏现象。低温环境下,路面沥青材料呈弹-脆性,裂缝倾角会对反射裂缝的扩展产生重要影响,反射裂缝的扩展机理对优化路面结构的抗裂设计具有一定的参考意义。文章采用数值模拟的方法,对比低温作用下5种倾角(0°、30°、45°、60°、75°)工况反射裂缝的扩展规律,分析总结各工况下路面结构失稳的应力水平和声发射情况。结果表明,整体模型结构的最大应力值随倾角的增大呈波动式增长;在一定程度上,裂缝倾角增大,其扩展引起的面层表面破坏程度降低、时间延缓。
In China’s alpine regions, the pavement damage caused by reflection cracks is common. The asphalt material in low temperature environment is elastic brittle, and the crack inclination angle has an important influence on the propagation of reflection crack. The research on the propagation mechanism of reflection crack under low temperature has a reference significance for optimizing the anti cracking design of pavement structure. In the paper, the numerical simulation method is used to compare the propagation law of reflection crack under five conditions of low temperature(0°, 30°, 45°, 60°and 75°), a nalyze and summarize the stress level and acoustic emission of pavement structure instability under each working condition. The results showed that the maximum stress value of the overall model structure increased with the increase of the inclination angle. To a certain extent, the greater the crack inclination angles, the lower the surface damage caused by its propagations, and the time delays.
作者
孙淦
田鑫雨
钱涛
赵丽君
SUN Gan;TIAN Xin-yu;QIAN Tao;ZHAO Li-jun
出处
《智能城市》
2021年第23期75-76,共2页
Intelligent City
关键词
裂缝倾角
反射裂缝
脆性材料
抗裂
fracture dip angle
reflection crack
brittle material
crack resistance
