基于有限元的复合水泥混凝土路面面层层底应力分析与结构设计

Stress analysis and structural design of surface course bottom in composite cement concrete pavement based on finite element method

为满足重交通下复合水泥混凝土路面的使用要求,以贫混凝土作为基层材料,以沥青砂浆作为功能层设计水泥混凝土路面。采用软件ANSYS对不同路面结构进行力学响应分析。研究结果表明:基层材料由水泥稳定碎石变为贫混凝土时,水泥混凝土面层层底的荷载应力减小14.87%,温度应力减小2.70%,温度-荷载耦合应力减小10.02%;贫混凝土弹性模量由12 GPa增至16 GPa时,荷载应力、温度应力、温度-荷载耦合应力分别减小3.60%、1.09%和4.14%,应力下降幅度减小;荷载应力、温度应力的数值分析结果与理论计算结果的相对差小于10%,温度-荷载耦合应力的相对差较大。针对重交通、中等交通量等级设计复合水泥混凝土路面结构,应力校核结果表明,2种设计路面均满足使用要求。

To meet the usage requirements of composite cement concrete pavements under heavy traffic,a design scheme is proposed that uses lean concrete as the base material and asphalt mortar as the functional layer for the cement concrete pavement.The software ANSYS is used to perform mechanical response analysis on different pavement structures.The research results indicate that when the base material is changed from water-stabilized crushed stone to lean concrete,the load stress at the bottom of the cement concrete surface layer decreases by 14.87%,the temperature stress decreases by 2.70%,and the temperature-load coupling stress decreases by 10.02%.As the elastic modulus of lean concrete increases from 12 GPa to 16 GPa,the reduction in stress becomes less pronounced,with load stress,temperature stress,and temperature-load coupling stress decreasing by 3.60%,1.09%,and 4.14%,respectively.The numerical analysis results for load stress and temperature stress show that the relative difference with theoretical calculations is less than 10%,while the relative difference for temperature-load coupling stress is larger.For the design of composite cement concrete pavement structures for heavy traffic and moderate traffic volume levels,the stress verification results indicate that the two designed pavements meet the usage requirements.