砂砾土地基道面结构不均匀冻胀防治

为有效解决砂砾土地基道面结构不均匀冻胀问题,分析了道面结构冻胀防治现状及其问题,以及不均匀冻胀问题产生的主要原因;对果洛机场现场试验段的土质进行了颗粒分析试验,对天然砂砾土和表层细粒土的冻胀敏感性进行了评价。实测了现场土基的含泥量和含水率,设计了5种道面结构方案,并评价了各自的优缺点,优选出了跑道与道肩一体化方案,并对该最优方案进行了抗冻性验算和成本费用分析,最后对应用效果进行了验收评价。结果表明该方案不仅能够有效避免不均匀冻胀,且满足抗冻性要求,同时具有一定的经济适用性。根据实际工程反馈该方案冻胀防治效果良好。根据分析、试验、实测及验算等研究成果和工程实际情况,总结性地提出了工程措施建议。

Prevention of Uneven Frost Heave of Pavement Structure on Gravel Soil Foundation

In order to prevent the uneven frost heave deformation of pavement structure of gravel soil sub grade, this paper presets the condition and reasons for the occurrence on the uneven frost heave of pavement structure. According to the grain size analysis test and the measured value of silt content and moisture, the paper designs five schemes of pavement structure and compared them, then put forward a new anti freezing design measurement. Based on checking computation of frost resistance, the cost analysis and the actual application effect, the optimization program of integration of runway and the shoulder not only avoid the damage of uneven frost heave, but also meet the needs of frost resistance, and simultaneously have a certain economic applicability. Finally, the results show that actual measurement, checking computation and engineering practice, engineering measures are put forward. The result shows that the effectiveness of the practical application is good.