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为了解路基湿度场随气候季节性的变化规律,选取福建省浦南高速公路两个路段路基,通过埋设雨量传感器和路基土水分传感器进行了为期1年的湿度场实时监测。监测成果表明,工程区降雨与路基湿度峰值均出现在3月份和7月份,体积含水量变化最大值达25%,最大变异系数达14.45%,路基土湿度与降雨基本上呈现良好的正相关性,土体湿度变异性峰值主要集中在3月~7月的雨季,且主要分布在路床顶面以下40~60 cm处。因此,采用平均稠度法确定老路基的干湿类型时,建议最不利季节为每年的3月份和7月份;为保证路基处于干燥或中湿状态,需加强路基排水措施;路基土施工时,建议在最佳含水量湿侧2%附近进行压实,有利于减少路基湿度的变化。
In order to understand the regularity of the subgrade wetlands’ changing with the seasonal climate, two subgrade sections of Pu’nan Expressway in Fujian Province were selected. One-year humidity field monitoring was carried out by embedding rainfall sensors and subgrade soil moisture sensors. Monitoring results show that the peak of rainfall and embankment humidity in the project area occurred in March and July, the maximum value of volumetric water content reached 25%, and the maximum coefficient of variation reached 14.45%. The soil moisture of the subgrade soil basically showed a positive correlation with rainfall , Soil moisture variability peak mainly concentrated in the rainy season from March to July, and mainly distributed in the roadbed below the top 40 ~ 60 cm. Therefore, when the average consistency method is used to determine the type of wet and dry roadbed, the most unfavorable season is suggested as March and July each year. In order to ensure the subgrade is dry or wet, it is necessary to strengthen the subgrade drainage measures. During the construction of subgrade soil, it is suggested Compaction near 2% of the wet side of the optimum moisture content will help to reduce the change of subgrade humidity.