高寒地区机场道面基层底面冻胀应力的计算

传统的高寒地区机场道面厚度设计,一般较少考虑冻胀作用下道面正常使用的要求,道面在冬季均会产生冻胀现象。基于推导由冻胀引起的作用在道面面层的应力,从能量平衡的角度,推导出了作用在基层底面的冻胀应力解析式。研究结果已在某机场改造工程冻土实验中进行了验算,误差为2%,结果表明该解析解在高寒地区的机场道面和水泥混凝土公路结构层设计中均是有效和可行的。

Calculation of Frost Heave Stress on the Airport Pavement Base Bottom in Frigid Area

The requirement for the normal use of pavement is less considered in the traditional airport pavement design in frigid area,so the frost heave is brought on the pavement in winter.Based on deducing the stress acted on the base surface begotten by frost heave,and from the point of view of energy balance,the analytic formula of frost heave stress acted on the base bottom is deduced.The result has been checked in the frozen soil experiment in the airport reconstruction project,the error is 2%.This presents that the analytic formula is efficient and feasible in the design of both airport pavement and cement concrete read layer.