粗粒土地基道面冻胀原因及防治措施

摘要

In order to control nonuniform frost heaving of pavement on coarse grained soil subgrade,the indoor experiments are conducted for frost heaving ratio of coarse grained soil.The causes of frost heaving of airport pavement and shoulder are analyzed on coarse grained soil subgrade.Based on characteristic of airport,the calculation model of tension strain of semi-rigid type base is proposed for the runway shoulder.Taking Guoluo Airport for example,the gross of frost heaving of subgrade are calculated for various silt contents.The.tension strains of base course of runway pavement and shoulder are checked,and controlling standard of silt content is proposed.The structure design and construction measures are put forward for controlling frost heaving and slab faulting of narrow runway shoulder.%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.