设置防裂夹层的半刚性路面面层应力分析

Stress Analysis of Semi-rigid Road Surface with Anti-cracking Interlayer

结合半刚性基层沥青路面大修工程实践,在二维有限元的基础上,采用商业通用有限元软件ANSYS计算分析了设置玻璃纤维格栅和应力吸收夹层两种类型的路面结构,从理论及有限元力学分析上比较深入的研究了不同参数情况下夹层抵抗反射裂缝的效果,分析夹层对沥青面层底部应力的消散作用。结果表明:采用夹层可以有效的减少荷载、温度变化等的不利影响,能够有效减轻或延缓反射裂缝的产生,较小模量、较大厚度的夹层的防裂效果较明显。

By the practice of the major repair works of semi-rigid asphalt pavement,based on two-dimensional finite element, we use the general- purpose commercial finite element software ANSYS to analyze two types of the surface structure which are set of glass fiber gratings and stress absorbing interlayer. According to the analysis of mechanical theory and finite element,we study the interlayer effect of preventing reflective cracking under different parameters,and analyze how interlayer dissipates the stress at the bottom of asphalt surface. The results show that the interlayer can effectively reduce the load, temperature change and other adverse effect, reduce or delay the emergence of reflective cracking. The smaller modulus and the thicker of the interlayer is, the more obvious anti-cracking effect is.