中文摘要：

选取湖南省长沙地区的典型路基填料粘土质砂SC,采用室外挖坑测试的方法,对粘土质砂路基内部含水率进行了为期2年的跟踪观测,以探讨路基内部含水率的季节性变化规律.研究结果表明,在南方潮湿多雨地区,粘土质砂路基内部实际含水率介于最佳含水率和塑限之间,其中,1～7月份的内部含水率较高,峰值出现在3～6月份的最不利季节,年平均含水率超过最佳含水率约6%而小于塑限5.5%,且月平均含水率随着时间呈季节性周期变化.回归分析显示两者具有良好的单正弦或双正弦函数的相关关系.

英文摘要：

Through selecting one kind of typical subgrade filler such as clayey sand（SC） in Changsha Area of Hunan Province,the outdoor tests with digging pit were applied to make the tracing observation for 2 years for the internal moisture contents of clayey sand subgrade,and we analyzed the seasonal variation regularity of the subgrade internal moisture content.The results show that,in the southern moist and rainy areas,the actual internal moisture contents of clayey sand subgrade lie between the optimal moisture content and the plastic limit,in which are higher from January to July,and the peak values occur in the most unfavorable season from March to June.The annual average moisture content is exceeding about 6% than the optimal moisture content and smaller than 5.5% of the plastic limit.The monthly average moisture contents have a seasonal period variation with time,and the regression analysis show that there is a good correlation of single-sine or double-sine function.