沥青路面结构层参数对路表弯沉盆影响分析

摘要

The object of this study is to analyze the surface deflection behavior of the as-phalt pavement with different layer parameters based on the multi-layer elastic system theory using BISAR.The analysis result indicates that subgrade modulus is the main fac-tor influencing the deflection basin and can lead to an entire movement of deflection ba-sin.The main impact area of asphalt surface modulus is within 20 cm of load center,and 30 to 120 cm from the load center for subgrade modulus.The base thickness had a grea-ter influence on the deflection basin than surface thickness.Surface deflection increased quickly once cutting-slippage between the base and surface appeared.When ALK was 10, the growth rate of the deflection on load center can reach 27.13%.%基于弹性层状体系理论，利用 BISAR 软件，计算了 FWD 标准荷载作用下结构层动态模量、厚度以及层间粘结状态对路表弯沉盆的影响。计算结果表明：路基模量是影响路表弯沉大小的主要因素，路基模量减小造成弯沉盆的整体下移；面层模量主要影响荷载中心外20 cm 范围内的弯沉，基层模量的影响范围为30~120 cm；结构层中基层厚度对路表弯沉盆影响较大；层间出现滑移后，路表弯沉迅速增大。当 ALK =10时，最大弯沉增幅可达27.13%。