应力吸收层缓解沥青混凝土加铺层应力集中的数值模拟分析

沥青混凝土加铺层的反射裂缝,主要是由旧水泥混凝土路面接缝处应力集中导致加铺层应力过大而引起的。采用有限元方法对设置与未设置应力吸收层的加铺层结构进行对比分析可知,在旧水泥混凝土路面与沥青混凝土加铺层之间设置应力吸收层后,加铺层结构的荷载应力、温度应力及应力强度因子均有大幅度的降低,应力吸收层的模量越低,效果越明显。理论分析结果表明,应力吸收层可有效地缓解接缝处沥青混凝土加铺层的应力集中现象,延缓反射裂缝的产生与发展速度。

Numerical Simulation Analysis of Stress-Absorbing Layer to Relieve Stress Concentration in Asphalt Concrete Overlay

Stress concentration at joints of old cement concrete pavement induces too large stress to cause reflective cracking in asphalt concrete overlay.The finite element methods are used to carry out comparative analysis for overlay structures with or without stress-absorbing layer,load stress,thermal stress and stress intensity factors drop by big percentages while stress-absorbing layer is installed between old cement concrete pavement and asphalt concrete overlay,and the effect is more obvious with the lower module of stress-absorbing layer.Theoretical analysis results show that stress-absorbing layer can relieve stress concentration at joints of asphalt concrete overlay and delay the speed of production and propagation of reflective cracking.