关键词: 道路工程；沥青路面；动应力；传递规律

Abstract: To reveal the variation law of the dynamic response of asphalt pavement under the action of heavy-duty trucks, the spatiotemporal distribution of vertical dynamic stress in the pavement structure was studied, which took two kinds of semi-rigid base asphalt pavements such as the ring structure 7 and structure 8 of the RIOHTrack full-scale test track as the research objects. The results indicate that under the action of multi-wheel heavy-duty trucks, as the depth of the pavement deepens, the vertical dynamic stress peaks appear to overlap. The greater the strength of the base material, the smaller the depth from the road surface to the position where the vertical dynamic stress peaks completely overlap. The vertical dynamic stress fluctuates in a zigzag pattern along the depth direction of the subgrade and pavement. Among them, in the upper base layer, the vertical dynamic stress attenuation is the most obvious, and the peak value of the vertical dynamic stress wave attenuates by more than 90% relative to the peak value of the bottom wave of the lower layer. At the bottom of the lower layer, the accumulated stress is relatively high, which can easily cause fatigue failure. Along the depth direction of the pavement, under the influence of stress diffusion and material damping, the vehicle load firstly reaches the subgrade and has the longest duration of action in the subgrade.

Key words: highway engineering; asphalt pavement; dynamic stress; transmission law