高温重载条件下全柔性高模量沥青路面结构的应用研究

Application Research on Full Flexible High Modulus Asphalt Pavement Structure under High Temperature and Heavy Load Conditions

本文依托喀麦隆雅杜高速公路,考虑喀麦隆热带雨林气候条件下高温重载交通组成特性,采用非线性有限元方法对雅杜高速公路全柔性沥青路面结构进行力学敏感性研究,并优化路面结构设计方案。结果表明,避免重载、超载是预防全柔性高模量沥青路面病害产生的有效措施。提高基层模量可有效减小路面下基层层底拉应力,改善全柔性高模量沥青路面的抗疲劳性能,而增加面层模量对改善全柔性高模量沥青路面使用性能效果不显著。通过增加上、下基层厚度可有效减少全柔性高模量沥青路面各结构层的水平剪应力、竖向压应力和下基层层底拉应力,提高全柔性高模量沥青路面的抗车辙和抗疲劳性能,根据力学响应结果确定了6 cm BBM上面层+9 cm BBM下面层+10 cm EME基层的路面组合结构为最佳的路面结构方案。

Based on the Yaoundéto Douala Expressway in Cameroon,considered the characteristics of high temperature and heavy load traffic under the tropical rainforest climate in Cameroon,the mechanical sensitivity of the full flexible asphalt pavement structure is studied by using nonlinear finite element method,so as to optimize the pavement structure design scheme.The results show that avoiding heavy load and overloading is an effective measure to prevent diseases of full flexible high modulus asphalt pavement.Increasing the base modulus can effectively reduce the tensile stress under the base and improve the anti-fatigue performance of full flexible high modulus asphalt pavement,while increasing the surface modulus has a general effect on improving the performance of full flexible high modulus asphalt pavement.By increasing the thickness of upper and lower base course,the horizontal shear stress,vertical compressive stress and bottom tensile stress of each structure layer of full flexible high modulus asphalt pavement can be effectively reduced,and the anti-rutting and anti-fatigue performance can also be improved.According to the results of mechanical response,the final construction plan is the combination thickness of 6 cm BBM upper layer,9 cm BBM lower layer,and 10 cm EME base asphalt layer.