与路面协调设计的公路路基设计指标及使用环境探讨

针对当前公路路基路面设计协调性差及规范的适用环境与当前公路使用环境、轴载状态差异问题,本着路基路面协调设计的思想,从影响路基结构特性的因素入手,研究了温度、湿度、荷载3大影响路基路面结构设计的主要因素,分析计算了不同环境、轴载状态下重载交通公路路基动应力、应变及公路工作区深度变化规律,揭示了在使用环境条件下进行路基结构设计的重要性.最后根据路基动应力、应变分析结果与控制标准,提出了适应重载交通的交通等级与设计标准轴载,以及适应重载交通高速公路的设计轴载与路基强度指标标准建议值,并基于与路面协调设计思想对使用环境下的公路路基设计提出了一些建议.

Discussion About Operation Environment and Design Index of Highway Subgrade Based on Subgrade and Pavement Coordination Design

Because of the incompatible status between the current subgrade and pavement design specifications,as well as the diversity between specifications and actual highway operation environment and overloading vehicles,in the idea of subgrade and pavement coordination design,from the factors influencing subgrade structural characteristics,the effect of temperature-humidity-load on subgrade and pavement structural designing is studied.The change regularity of dynamic stress,strain and workspace depth of overload vehicles highway subgrade in different environment and load conditions is analyzed.That reveals the importance of operation environmental conditions in subgrade structural design.Last,based on the result of dynamic stress,strain analysis and the control standards,the traffic classification and design stan-dard,as well as the design axle load criterion and subgrade intensity indexes which adapt to expressway with overloading vehicles are pointed out.Some viewpoints about highway subgrade design in operation environment based on subgrade and pavement coordination design are put forward.