非均布三向应力作用下CRC+AC复合式路面动力响应分析

来源期刊:中南大学学报(自然科学版)2021年第3期

论文作者:李盛 张豪 程小亮

文章页码:971 - 983

关键词:道路工程;复合式路面;数值模拟;温度梯度;拉应力

Key words:road engineering; composite pavement; numerical simulation; temperature gradient; tensile stress

摘    要:对CRC+AC复合式路面动力响应进行分析,研究基于子午线轮胎考虑非均布动态荷载作用,运用Abaqus有限元软件进行三维实体建模并进行数值模拟,分析CRC+AC复合式路面结构的温度场及应力分布,并对非均布动荷载作用下CRC+AC复合式路面表面拉应力的影响因素进行分析。研究结果表明:路面结构深度越大,温度变化越小,当深度超过0.6 m时,温度几乎没有变化且与外界环境平均温度相差不大;在一定范围内,增加AC层厚度可降低AC层的最大温度梯度,有利于降低路面出现裂缝的风险,提高路面使用性能;最大横向拉应力出现在轮胎前端两侧,最大纵向拉应力和最大主拉应力出现位置一致,位于轮隙中心沿行车方向2~3 cm处;路面转弯处的最大主拉应力出现在轮胎前端左上角,在同等水平力作用下,转弯处的最大主拉应力是正常直线行驶时的1.48倍;沥青面层表面最大主拉应力随轴载呈线性变化;当轴载大于100 kN时,轴载每增加10%,拉应力增加8.5%;纵向水平力系数对横向拉应力影响显著。研究成果可为CRC+AC复合式路面的沥青层开裂、车辙等病害预防提供技术支持,并为材料选择和结构设计提供理论依据。

Abstract: The dynamic response of CRC+AC composite pavement was analyzed, 3D solid modeling and numerical simulation were conducted by using Abaqus finite element software based on radial tire to consider the function of non-uniform dynamic load, the temperature field and stress distribution of CRC+AC composite pavement structure were conducted, and the influencing factors of CRC+AC composite pavement surface tensile stress under non-uniform dynamic load were studied. The results show that the deeper the pavement structure, the smaller the temperature changes. When the depth exceeds 0.6 m, the temperature has almost no change and is not very different from the average temperature of outside environment. Within a certain range, increasing the thickness of the AC layer can reduce the maximum temperature gradient of the AC layer, and it is helpful to reduce the risk of cracks on the road surface and improve the performance of the road surface. The maximum lateral tensile stress occurs on both sides of the front end of the tire. The maximum longitudinal tensile stress and the maximum main tensile stress appear at the same position at the center of the wheel gap in the driving direction of 2—3 cm. The maximum principal tensile stress at the corner of the road appears at the upper left corner of the front end of the tire. Under the same horizontal force, the maximum principal tensile stress at the corner is 1.48 times of normal straight driving.The maximum principal tensile stress on the surface of the asphalt layer changes linearly with the axial load.When the axial load is more than 100 kN, the tensile stress increases by 8.5% for every 10% increase in the axial load. The longitudinal horizontal force coefficient has a significant effect on the magnitude of the transverse tensile stress. The research results can provide technical support for the prevention of cracking and rutting of the asphalt layer of the CRC+AC composite pavement, and provide theoretical basis for material selection and structural design.

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