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根据路面断裂力学基本理论与二维有限元方法,对开级配大粒径沥青碎石混合料(Open-graded Large Stone as-phalt Mixes,简称OLSM)缓解层沥青路面的反射裂缝扩展路径进行了数值模拟。研究表明:在轮载与温度耦合作用下,反射裂缝并非直线向上扩展,而是呈“之”字形向上延伸;尤其是在OLSM缓解层中,当裂缝扩展遇到孔隙时,其扩展路径被孔隙所阻隔而愈呈“之”字形;裂缝扩展路径愈曲折,裂缝自下而上扩展至沥青面层顶部的时间越长,从而延长了路面使用寿命。
According to the basic theory of fracture mechanics and the two-dimensional finite element method, the reflection crack propagation path of the open graded Large Stone as-phalt Mixes (OLSM) Numerical Simulation. The research shows that under the coupling of wheelset and temperature, the reflection cracks do not extend upwards linearly, but extend upwards in the shape of “”. Especially in the OLSM mitigation layer, when the crack expands to encounter the pore, its propagation path The more the zigzag path of the crack propagates, the longer the crack extends from the bottom up to the top of the asphalt surface layer, thus prolonging the service life of the road surface.