温度变化对高速公路盐渍土地基变形的影响分析

为了解决西北盐渍土地区高速公路出现的季节性冻胀和沉陷等变形问题，通过对G215线柳园至敦煌高速公路地基进行温度、湿度的现场监测，分析地基土中的温湿度随时间的变化规律。在此基础上，开展室内不补水冻融循环试验，对氯盐渍土的变形特性进行分析研究。结果表明：全年监测期间，地基土的温度敏感深度为85 cm，25~85 cm深度内地基中的含水率较高。在室内冻融循环试验中，含盐量为0.71%的土样冻胀变形大于融沉变形，体积累加变形量最大；压实度为95%的土样体积增加率达到1.14%，较85%压实度土样大0.7%，压实度越大的土样其冻胀变形大于融沉变形，土样体积累加变形量与压实度大小具有相关性；含水率为19.32%的土样体积增加率为7.70%，较27.32%含水率土样大7.44%，含水率小的土样融沉变形小于冻胀变形，土样体积累加变形量与含水率大小呈负相关。该研究结果能为盐渍土地区高速公路的病害分析提供参考。

Analysis of the Influence of Temperature Change on the Deformation of Saline Soil Floor in Expressway

In order to solve deformation problems such as seasonal frost and sinking of highways in the northwest saline earth region, the temperature and humidity of the G215 line willow garden to Dunhuang Expressway foundation, the temperature and humidity in the ternate is analyzed. Change law. On this basis, the interior non-hydrating freeze-thaty test was carried out, and the deformation characteristics of chloroflite soil were analyzed. The results show that during the year monitoring period, the temperature sensitive depth of the ground soil is 85 cm, and the water content in the 25~85 cm depth inland basis is high. In the indoor freeze-thating cycle test, the salt-containing amount of soil-containing frost is greater than that of the integrated deformation, the volume accumulation is maximum; the soil sample volume increase rate of 95% is 1.14%, which is more than 85%. The compactive soil sample is 0.7%, the larger the compaction, the soil-free deformation is greater than the integration deformation, the amount of the soil sample volume has correlation with the compaction size; the moisture content is 19.32% soil sample volume. The increase rate is 7.70%, compared to 27.32% aqueous content of 7.44%, and the soil-containing melting deformation of small water content is smaller than the frosty deformation, and the amount of soil samples is negatively correlated with water content. The results of the study can provide reference for the disease analysis of highways in the saline earth.