港区沥青铺面面层的等效温度

Equivalent temperature for the port asphalt pavement surface course

不同于常规公路路面结构所承受的车辆荷载,港区铺面结构具有承受装运机械荷载类型多、荷载量大、运行速度低和重复作用次数少等特点。根据港区沥青铺面设计准则,分别基于面层层底弯拉应变、半刚性基层层底弯拉应力、土基顶面压应变等3个设计指标和Miner损伤叠加原理,介绍了港区沥青铺面面层等效温度概念及其计算方法;建立了基准状况下面层等效温度与地区海拔、铺面表面温度年均值及其标准差之间的回归式;为了简便实用,又建立了基准面层等效温度与2个常见的气象参数即年平均气温和月平均气温年极差之间的回归关系式;绘制了全国基准面层等效温度等值线图;总结了非基准各因素对面层等效温度的影响规律,给出了近似修正式。

Unlike the vehicle loading upon the conventional road pavement structure, the port pavement structure is characterized by many types of shipping mechanical loads, heavy load carrying capacity, low operating speed and course, the compression strain on the top of the subgrade and Miner damage superimposed principle, conception and calculation method of the equivalent temperature for the port asphalt pavement surface course are introduced in on formulas among the standard equivalent temperatures for the surface course, the altitude of the asphalt pavement located, pavement surface average temperature and its standard deviation over the years are established. To be simple and practical, the regression formulas between the equivalent temperature for the surface course and two common meteorological parameters, annual average temperature and difference of the highest and lowest monthly average temperature, are established. The contour maps in China of the equivalent temperatures for the surface course are drawn. Finally, the influence rules of various factors on the equivalent temperatures for the surface course are summarized and an approximate modified formula is given.