基于足尺APT的沥青路面结构动力响应特征研究  

Research on Dynamic Response Characteristics of Flexible Pavement Structure Based on Full-Scale APT

作　　者：李世仲 LI Shi-zhong(China Railway Construction Group Infrastructure Construction Co,Ltd.,Beijing 100040,China)

机构地区：[1]中铁建设集团基础设施建设有限公司,北京市100040

出　　处：《公路》2024年第4期49-55,共7页Highway

摘　　要：采用重载车辆模拟器(HVS)对沥青路面结构进行常温条件下的加速路面试验(APT),研究不同沥青层厚度和轴重下路面结构的动力响应和长期使用性能,探讨沥青路面结构的车辙横断面轮廓曲线特征、车辙深度、分层沉降发展趋势,并分析各结构层测点的最大动应力、回弹应变和累积塑性应变特征,揭示车辆轮载和加载次数对沥青路面结构动力性能的影响规律。研究结果表明:车辆双轮轮迹处车辙横断面分布呈现W形状,最大车辙深度呈现先迅速发展而后近似线性增长最后陡增的趋势,可分为压密变形、蠕变增长和剪切变形3个阶段;沥青层厚度增大到2倍后,沥青层底部纵横向应变,以及各结构层测点的最大动应力和回弹应变均显著降低,分层沉降减少1~1.5倍;沥青层下部各结构层分层沉降近似线性增长,并在重载阶段发生陡增,各测点的最大动应力、回弹应变和累积塑性应变均呈现台阶式增长趋势;车辆轴重和沥青层厚度是影响沥青路面结构变形和动应力的关键因素。The Accelerated Pavement Test(APT)on the flexible asphalt pavement structure is conducted by the Heavy Vehicle Simulator(HVS)under the condition of room temperature.The dynamic response and long-term performance are investigated to study the effect of different asphalt layer thickness and axle load.The development of rutting curve,rutting depth,and layered settlement in the flexible asphalt pavement structure are investigated.The characteristics of maximum dynamic stress,resilient strain,and cumulative plastic strain of each measuring point of each structural layer are analyzed.These studies aim to reveal the effect of vehicle load and load times on the dynamic performance of the flexible asphalt pavement structure.The results show that the rutting cross section presents a W-shape at double wheel tracks.The maximum rutting depth develops rapidly at first,then increases linearly and finally increases sharply,which can be divided into the compaction stage,creep stabilization stage,and shear failure stage.When the asphalt layer increases to 2times,the longitudinal and transverse strain at the bottom of asphalt layer,the maximum dynamic stress and resilient strain at the measuring points of each structural layer decreases significantly,and the layered settlement decreases by about 1~1.5times.The layered settlement of each structural layer under the asphalt layer increases linearly and steeply in the heavy vehicle load stage.The maximum dynamic stress,resilient strain,and cumulative plastic strain at each measuring points show a stepwise increase trend.The vehicle axle load and asphalt layer thickness are the key factors for the deformation and dynamic stress in the flexible asphalt pavement structure.

关 键 词：沥青路面 加速路面试验(APT) 足尺试验 重载车辆模拟器(HVS) 动力响应 

分 类 号：U416.217[交通运输工程—道路与铁道工程]