基于MMLS3的沥青路面结构模型的尺寸研究

Size of Pavement Structure Model with One third Scaled Model Mobile Load Simulator

摘要:

通过在室内试槽中铺筑并振动碾压成型路面结构模型，然后使用小型加速加载试验设备1/3行车荷载模拟系统（MMLS3）进行加载，采集结构内多点的应变并加以分析，据此判定结构模型的合理尺寸.目前主要对水泥稳定碎石基层沥青面层结构模型进行了测试.初期试验结果表明：在荷载影响区内，沥青层底的任一点上的横向拉应变远大于纵向的应变；随着荷载的移动，纵向应变发生压拉压的变化，横向应变始终为拉应变；根据面层底的应变分布情况，考虑到MMLS3轮载的特点，建议结构模型的纵向尺寸不少于100~120 cm，横向尺寸不少于50~60 cm.

关键词:路面结构模型; 1/3行车荷载模拟系统（MMLS3）; 力学响应; 沥青路面

Abstract:

The pavement model constructed in a small test pit and compacted by a vibratory roller was loaded by a one third scaled accelerated instrument, Model Mobile Load Simulator 3 (MMLS3). The strains of different positions in the structure were collected and analyzed to explore the effective size of small scaled structure model. At present, the asphalt pavement model with cement treated aggregates base was tested. The preliminary analysis of data showed that in the zone under loading affection, the transverse strain at the bottom of the asphalt layers was tension strain and much more than the longitudinal strain. The state of longitudinal strain varied from compression to tension with the loading’s approaching and returned to the compression state with the loading leaving. The lateral strain is always tension strain. Based on the strain distribution with the distance, the effective size of the model can be determined as 100~120 cm in longitudinal direction and 50~60 cm in transverse direction.

Key words:pavement structure model; model mobile load simulator 3 (MMLS3); mechanical response; asphalt pavement