基于沥青面层曲率指数反算沥青面层的弹性模量

基于层状弹性体系理论,由路面结构的路表变形响应反算沥青面层的弹性模量.根据落锤式弯沉仪数据采集传感器与荷载中心的距离,构建了结构层参数与其相应路表弯沉盆之间的数据库.通过分析此数据库提出了沥青面层的临界影响厚度,并基于此临界影响厚度建立了相应的回归模型.理论弯沉盆和实测弯沉盆反算的算例对比分析表明,该方法具有良好的精度和可靠性,是一种实用、有效而快速的评定路面承载能力的方法.

Backcalculation of Elastic Moduli of Asphalt Surface Course Based on Asphalt Surface Curvature Index

Based on the theory of layered elastic system,first,the moduli of asphalt surface course were backcalculated according to the surficial deflection responses of pavement structure.Next,a database of the structural para-meters and the corresponding surface deflections was established according to the offsets of geophones set on the falling weight deflectometer to the center of load plate.Then,the critical influencing thickness of asphalt surface course was brought up after analyzing the database.Finally,regressive models were developed according to the corresponding critical influencing thickness.It is shown,from the comparative analyses of theoretical and measured deflection basins,that the proposed method is practical and effective in rapidly evaluating pavement bearing capacity with high accuracy and good reliability.