按薄板的大挠度理论对柔性路面结构设计的改进

研究目的:根据柔性路面的力学特性,改进柔性路面结构设计。研究方法:针对柔性路面的结构设计理论进行分析,提出了基于薄板大挠度理论的面层厚度计算方法。根据实际的轮压荷载分布特点将传统方法中近似为圆形分布的假定,改为采用等效的矩形分布假设;并根据板的路面板的变形特性,采用较为合理的长边简支的边界条件。按大挠度弹性理论,采用无限长板的简化模型进行结构计算,推导出计算面层厚度的解析表达式,并编制相应的计算程序,针对具体的算例进行计算分析。研究结果:与传统设计方法的计算对比,该方法可以减少面层厚度约18.3%。研究结论:基于薄板大挠度理论的面层厚度计算方法为柔性路面设计提供了一种更经济的分析模式。

Improving Structural Design of Flexible Pavement with Large Deflection Theory of Slab

Research purposes: According to the mechanics characteristic of flexible pavement,the structural design of flexible pavement was improved.Research methods:The analysis is made with the theory for structural design of flexible pavement and a new computing method for surface course thickness of flexible pavement is put forward with large deflection theory of slab.According to the real load distribution of wheel pressure,the wheel pressure is assumed as equivalent rectangle distribution instead of circular distribution used by traditional method.According to the deformation features of road slab,the simply supported boundary condition with long side is applied.The structural calculation is made with simplified model for infinite slab,from which the formula is derived for calculation of surface course thickness based on the large-deflection elastic(theory).The calculator program is programmed and analysis is made for concrete calculation example.Research results:About 18.3% surface course thickness can be saved by adopting this method compared with(traditional) method.Research conclusions:This method provides an economical analysis mode for design of flexible pavement.