沥青路面动应变响应及其动荷载作用等效换算

发布时间：2018-03-17 13:00

本文选题：沥青路面　切入点：落锤式弯沉仪(FWD)　出处：《土木工程学报》2017年01期 　论文类型：期刊论文

【摘要】：通过现场动态实测试验,获取了在FWD冲击荷载与BZZ-100标准行车荷载作用下沥青面层底部的应变响应特征及其温度敏感性,研究了FWD冲击荷载与标准行车荷载作用间的等效换算关系。研究表明:在动荷载作用下,沥青面层底部主要呈受拉状态,其纵向应变响应大于横向应变;应变响应量随FWD荷载增大而增大,随行车荷载车速增大而减小;面层层底应变响应的温度敏感性主要与路面结构组合有关,受荷载变化的影响较小;面层底应变响应的温度敏感性排序为:倒装式路面S2组合式路面S3半刚性路面S1;随着FWD荷载增大,与其等效的行车荷载所对应的车速水平逐渐降低;在相同FWD荷载下,不同类型路面对应的等效行车荷载速度水平为:S1S3S2;建立了FWD荷载与标准行车荷载间的等效换算关系,有助于FWD荷载更准确地模拟实际行车荷载。
[Abstract]:The strain response characteristics and temperature sensitivity of asphalt surface bottom under FWD impact load and BZZ-100 standard traffic load are obtained by field dynamic test. The equivalent conversion relationship between FWD impact load and standard traffic load is studied. The results show that under dynamic load, the base of asphalt surface is mainly in tensile state, and its longitudinal strain response is larger than that of transverse strain. The strain response increases with the increase of FWD load and decreases with the increase of vehicle load speed, and the temperature sensitivity of the strain response at the bottom of the surface is mainly related to the pavement structure combination, which is less affected by the load change. The order of temperature sensitivity of the strain response at the bottom of the surface is as follows: S1 of S3 semi-rigid pavement, S2 composite pavement of inverted pavement; with the increase of FWD load, the speed level corresponding to the equivalent driving load decreases gradually; under the same FWD load, The equivalent speed level of traffic load corresponding to different types of pavement is: 1 / S1S3S2. The equivalent conversion relationship between FWD load and standard traffic load is established, which is helpful to simulate the actual traffic load more accurately with FWD load.
【作者单位】：西南交通大学土木工程学院;西南交通大学道路工程四川省重点实验室;四川建筑职业技术学院;
【基金】：国家自然科学基金(51378438) 四川省交通厅科技项目(2010B28-2) 四川省教育厅科研项目(16ZB0513)
【分类号】：U416.217

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