半刚性基层沥青路面动态应变响应模拟分析

Field Measurement and Numerical Simulation of Dynamic Strain Response of Asphalt Pavement with Cracked Semi-rigid Base

为研究半刚性基层沥青路面的结构动态应变响应规律,依托工程项目开展动态应变实测,并基于ABAQUS进行了三维动态仿真试验,对结构各层的应变响应规律进行对比分析。结果表明,最大纵向及横向拉应变均出现在冷再生层底部,说明疲劳开裂最可能在此产生。面层与基层间接触接近于滑动条件,可能是由于裂缝处面层与半刚性基层间产生了脱空。实测与数值仿真所得各层动态应变规律较为一致,说明动态应变测试方法能较好地反映沥青路面的真实应变响应,可为半刚性基层沥青路面结构设计与性能评价提供依据。

To study the actual mechanical state of semi-rigid base asphalt pavement under the moving vehicle load,a dynamic strain field measurement rely on the engineering project and a dynamic strain simulation based on ABAQUS were carried out. The strain test and simulation results were compared and the strain responses of pavement layers were analyzed. The result indicates that the maximum tensile strainoccurrence position is on the bottom of the surface course. The contact condition between the surface layer and the base is close to the sliding condition because of the separation of surface and base,which can increase the strain of the bottom layer and accelerate the pavement destruction as well. The diversification of field measurement is consistent with that of simulation. It is proved that the strain measurement can reflect the actual mechanical state of pavement structure and provides references for asphalt pavement structural design and performance evaluation.