加速加载条件下沥青路面结构动力响应

发布时间：2018-02-08 22:20

本文关键词： 沥青路面加速加载动态响应倒装结构 MLS　出处：《哈尔滨工程大学学报》2014年06期 　论文类型：期刊论文

【摘要】：为深入了解交通荷载作用下不同沥青路面的行为特征,通过MLS66加速加载设备模拟实际车辆作用,实测了半刚性基层结构与倒装结构路面的3个方向动态响应,研究了正载与偏载时面层与基层底部的应变响应规律。实测应变显示:半刚性路面中基层底部拉应变大于面层。倒装结构面层底部弯拉应变大于半刚性路面,对荷载作用次数更加敏感。倒装结构中最大拉应变出现在面层底部纵向,疲劳开裂首先在横向出现。2种结构的面层应变响应均体现了沥青混合料的黏弹性特征。不同轴载下应变测值表明,考虑超载车辆对路面结构作用时,应选用接地压力作为参数进行计算。基于MLS66的路面结构动力响应研究,为理解不同路面结构的破坏现象提供了帮助。
[Abstract]:In order to understand the behavior characteristics of different asphalt pavement under traffic load, the dynamic response of semi-rigid base structure and reverse structure pavement in three directions was measured by MLS66 accelerated loading equipment. In this paper, the strain response law of the surface layer and the base base under positive and eccentric loads is studied. The measured strain shows that the tensile strain at the base of the semi-rigid pavement is greater than that on the surface, and the bending strain at the bottom of the inverted structural surface is greater than that on the semi-rigid pavement. It is more sensitive to the times of loading. The maximum tensile strain in the inverted structure appears at the bottom of the surface longitudinally. At first, the strain response of the surface layer of 2 kinds of structures in the transverse direction of fatigue cracking reflects the viscoelastic characteristics of asphalt mixture. The strain measurements under different axial loads show that the effect of overloaded vehicles on the pavement structure is taken into account. The study of dynamic response of pavement structure based on MLS66 is helpful to understand the failure phenomenon of different pavement structure.
【作者单位】：大连理工大学交通运输学院;辽宁省交通科学研究院;
【基金】：国家自然科学基金资助项目(50578031) 国家自然科学青年基金资助项目(51208080)
【分类号】：U416.217

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