刚性路面结构参数反演弯沉盆衍生指标法综合分析

Comprehensive analysis of derived indicators of deflection basin for back-calculation of rigid pavement parameters

摘要:

为解决刚性路面结构参数反演方法的适用性问题，综合分析刚性路面结构参数反演中3类代表性的弯沉盆衍生指标法.在系统梳理弯沉盆面积指数法、惰性点法、弯沉盆重心距离法的模型体系的基础上，采用理论数值分析的方法，定量分析3类衍生指标的规律特性，并从工程适用的简单、易操作性出发，提出惰性点法的计算图表和弯沉盆面积指数法及重心距离法的回归公式.以典型的刚性道面结构形式为例，对比分析3类弯沉盆衍生指标法的参数反演结果的准确性和鲁棒性，检验所提出模型或图表的有效性.计算结果表明：提出的计算图表或公式大幅简化了参数反演中衍生指标的计算，3种衍生指标法的参数反演结果存在明显差异，弯沉盆重心距离法充分利用各测点的信息并以拟合误差最小化为原则，显著提高参数反演的精确性和鲁棒性.

Abstract:

In order to improve the applicability of back-calculation methods of rigid pavement parameters, this research presents comprehensive analysis of three representative derived indicators of deflection basin for back-calculation of rigid pavement parameters. By systematic analysis and modelling of AREA, intertial point (IP) and Barycentric Horizontal Distance (BHD) method in the ILLI-BACK, the distribution laws of these three methods were investigated quantitatively using numerical analysis, and the nomograph of IP and regression formulas of AREA and BHD were developed respectively to improve the applicability in the practice. Taking typical rigid pavement structure as an example, the accuracy and robustness of three comparative back-calculation methods were verified. Results showed that the back-calculation were greatly simplified using the nomograph and regression formulas. The back-calculation results based on three comparative methods exhibited remarkable difference. BHD significantly improved the accuracy and robustness in back-calculation of rigid pavement parameters by making full use of measurement information at all the sensors and minimizing the fitting error.