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基于三维有限元法,为混凝土路面砖路面结构分析开发出一个软件程序包(BlockPave 3D)。在BlockPave 3D的结构模型中,每块路面砖都作为分析的独立单元。接缝砂和垫砂层,则采用界面单元进行建模。这种建模方法中,允许考虑路面砖铺设图案、砖本身几何特征等因素,对路面砖、路基层和地基的挠度和应力所产生的影响。依据便携式FWD的挠度测量结果和人工神经网格(ANN)分析,对界面单元的弹簧常数进行评估。在本项研究中,根据ANN的训练过程,获得了FWD挠度与弹簧常数组合之间的关系。为研究路面砖路面在垂直荷载与水平荷载共同作用下的力学行为,根据便携式FWD对实际路面挠度的测量结果,进而通过ANN评估出弹簧常数,用BlockPave 3D对应力进行分析。
Based on the 3D finite element method, a software package (BlockPave 3D) was developed for pavement structure analysis of concrete pavement. In BlockPave 3D’s structural model, each pavement tile serves as a separate unit of analysis. The joint sand and mat layer are modeled using interface elements. This modeling method allows to consider the pavement brick laying patterns, brick geometric characteristics and other factors, the impact of pavement bricks, subgrade and foundation deflection and stress. The spring constants of the interface elements are evaluated based on the deflection measurements of the portable FWD and the artificial neural network (ANN) analysis. In this study, according to ANN training process, the relationship between FWD deflection and spring constant combination was obtained. In order to study the mechanical behaviors of pavement under vertical and horizontal loads, the spring constant was estimated by the portable FWD based on the measurement results of the actual road surface deflection, and then analyzed by BlockPave 3D.