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为了防止粗粒土地基上道面出现不均匀冻胀,开展了粗粒土冻胀率的室内试验,分析了粗粒土地基上出现道面和道肩冻胀的原因。针对机场的特点,提出了道肩半刚性基层拉应变的计算模型。结合果洛机场,计算了多个土基含泥量时的总冻胀量,验算了道面和道肩基层拉应变,并提出了含泥量控制标准。针对窄道肩出现的冻胀错台问题,提出了结构设计和施工的措施。
In order to prevent uneven frost heave on the pavement of coarse grained soil, an indoor test of the rate of frost heave of coarse grained soil was conducted. The causes of frost heaving of pavement and shoulder of coarse grained soil were analyzed. According to the characteristics of the airport, a calculation model of tensile strain of semi-rigid base of shoulder is proposed. Combined with the Guro Airport, the total amount of frost heaving when calculating the clay content in a number of soil is calculated, the tensile strain of the pavement and the shoulder of the road shoulder is calculated, and the control standard of clay content is proposed. Aiming at the problem of freezing and swell on the narrow shoulder, the structural design and construction measures are put forward.