高模量沥青混凝土路面抗车辙性能分析

从力学角度研究沥青混凝土模量的提高对于车辙产生的影响,提出了抵抗车辙危害新方法。从车辙产生的机理出发,分析高模量沥青混凝土材料的基本力学性能及路面结构中面层模量对车辙产生的影响;利用试验方法分析了高模量沥青混凝土材料的动稳定度和动态模量值,利用数值计算方法分析路面结构力学性能并分析高模量下路面结构的力学响应。通过试验研究发现,高模量沥青混凝土材料的动稳定度和动态模量值都有显著提高,有利于抵抗车辙产生;数值计算结果表明,路面承受最大剪应力的范围在路面结构的中面层,采用高模量沥青混凝土材料,提高路面结构中面层的弹性模量,可以有效地改善路面结构的受力状态,降低剪切应变的数值,抑制和减少沥青路面车辙的产生。

Research on Anti-rutting Perforrnance of High Modulus Asphalt Concrete Pavement

A new way of anti-rutting was put forward by improving modulus of asphalt concrete and the effect of high modulus asphalt concrete(HMAT) on rutting was studied in view of mechanics.Starting from the mechanism of rutting,the mechanical property of HMAT and the effect of modulus of middle layer on rutting were analyzed.The dynamic stability and modulus of HMAC were analyzed by test,and the mechanical property of pavement structure and the mechanical response of high modulus pavement structure were analyzed by numerical calculation.The result show that(1) increases of the dynamic stability and modulus of HMAC help to against rutting;(2) the maximum shear stress occurs in middle layer of pavement structure according to mechanical calculation.HMAC can raise elastic modulus of middle layer,improve stress state of pavement structure,and reduce shear strain and asphalt pavement rutting.