应用弯沉盆反算土基回弹模量

Backcalculation of subgrade resilient modulus using deflection basin

为准确反算土基回弹模量,利用层状弹性体系理论和冲击荷载沿路面结构下传扩散的特点,建立了路表变形响应与模量反算模型.通过层状弹性体系计算程序计算路表弯沉值,构建结构层参数与路表弯沉值之间一一对应的数据库,并基于此数据库建立了由路表弯沉盆反算土基回弹模量的回归模型.理论弯沉盆和实测弯沉盆反算的算例分析表明:计算结果与国内外一些著名的反算程序差异不大.距离荷载中心较远位置处的路表变形响应只受到土基的影响.

To accurately backcalculate the subgrade resilient modulus, a model of surface deflection responses of pavement and modulus backcalculation was established based on the layered elastic system theory and the characteristic of impact load transfer. The surface deflections were calculated using layered elastic system program. The database of structural parameters and corresponding deflections was established and a regression model was developed to backcalculate the subgrade resilient modulus. The analyses of theoretical and measured defection basins show that there is little difference between the obtained results and those calculated by other famous backcalculation programs. The surface deflection responses of pavement structure further away from the center of load are only affected by the subgrade.