抽水蓄能电站场内道路水泥混凝土路面结构设计研究

Design and Research on Cement Concrete Pavement Structure of Road in Pumped Storage Power Station

针对目前各在建抽水蓄能电站场内道路路基、路面结构设计差别较大,设计理念和计算方法不统一的情况,详细梳理水泥混凝土路面结构计算的主要理论及方法,选取了设计中较常采用的3种路面结构形式和7种常见的单轴—双轮组荷载,利用弹性地基双层板理论进行计算,通过对比计算结果得出面层板破坏的主要因素是疲劳荷载.考虑抽水蓄能电站交通运输特点,推荐了设计轴载作用次数换算方法及设计轴载的选取,建议了可靠度系数的选取范围及路肩硬化的形式.同时,分析了普通路面结构增设应力吸收层的优点,对于场内永临结合道路,设置应力吸收层后,可以减轻路面在施工期的破坏程度,降低路面在运行期的维护成本.

In view of the fact that the design of roadbed and pavement structures of the pumped storage power stations under construction are quite different and the design concept and calculation method are not uniform,the main theories and methods of structural calculation of cement concrete pavement are sorted out in detail.Three pavement structural forms commonly used in the design and seven common single-axle-double-wheel group loads are selected,and the elastic foundation double-layer plate theory is used to carry out the calculation.Comparing the calculated results,it is concluded that fatigue load is the main factor of surface plate failure.Considering the transportation characteristics of pumped storage power station,the conversion method of design axle load action times and the selection of design axle load arerecommended.The selection range of reliability coefficient and the form of shoulder hardening are suggested.At the same time,the advantages of adding stress absorbing layer to common pavement structure are analyzed.For the permanent road in the field,the damage degree of pavement in construction period can be reduced and the maintenance cost of pavement in operation period can be reduced by setting stress absorbing layer.