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通过对旧水泥混凝土路面板进行破裂稳固处理,使板块有效尺寸减小,可以抑制或消除旧水泥混凝土路面上沥青加铺层内的反射裂缝。通过建立有限元模型,模拟分析了水泥混凝土路面板不同破裂尺度对沥青加铺层荷载应力、温度应力的影响。模拟分析结果表明,随着水泥混凝土板块尺寸的减小,沥青加铺层的荷载应力有一定程度的降低,而温度应力则出现大幅度的降低,最大温度应力出现在旧板块边缘中间处的沥青加铺层层底,说明破裂旧水泥混凝土路面能有效地控制沥青加铺层反射裂缝的产生。结合试验路的承载板试验数据,分析表明破裂后路面板块尺寸越小,旧路面作为新加铺层基层其回弹模量值越小,承载能力就越低。综合旧板块破裂尺度和反射裂缝与回弹模量的关系,建议旧路面板的破裂尺度宜在50~80 cm之间。
By cracking and solidifying the old cement concrete pavement slab, the effective size of the slab can be reduced, and the reflective cracking in the asphalt overlay on the old cement concrete pavement can be suppressed or eliminated. Through the establishment of the finite element model, the influence of different rupture scales of cement concrete pavement slab on the load stress and temperature stress of asphalt overlay was simulated. The simulation results show that with the decrease of the size of cement concrete slab, the load stress of asphalt overlay decreases to a certain degree, while the temperature stress decreases sharply. The maximum temperature stress appears in the middle of the edge of the old slab Overlay layer, indicating that the cracked old cement concrete pavement can effectively control the generation of reflective cracking of asphalt overlay. According to the experimental data of the test board, the analysis shows that the smaller the size of the pavement slab after cracking, the lower the modulus of resilience of the old pavement as the new ply, the lower the carrying capacity. According to the rupture scale of old plate and the relationship between the reflection crack and the elastic modulus, it is suggested that the rupture scale of the old pavement slab should be between 50 and 80 cm.