路基含水率变化特征原位监测试验研究

EXPERIMENTAL STUDY ON THE IN-SITU MONITORING OF THE VARIATION CHARACTERISTICS OF THE MOISTURE CONTENT OF SUBGRADE

为了研究多雨地区路基含水率的变化特征,选取广州市北二环高速公路一高填方路段为研究实体,采用TDR水分传感器,对不同深度路基的体积含水率进行了为期半年的原位监测。结果表明,雨季来临时,路基的含水率变化较大,最大值达到14%,在土路基顶部一定范围内甚至接近饱和;路基土的含水率因距离路表的深度不同,在降雨入渗过程中,湿度变化出现较明显的时序性;在距离路表一定深度的路基内,土体的体积含水率的变异特性基本一致。

To study the variation characteristics of subgrade in rainy areas, we selected a high embankment of Guangzhou North Second Ring Expressway as research entity, and used TDR moisture sensor to monitor the volume water content of the soil in different depth of subgrade for half a year. The result show that when the rainy season comes, the water content of subgrade changes significantly. On the near top of the soil subgrade, the soil even close to saturation; in the process of rainfall infiltration, the soil humidity presents obvious sequential in the different depth of subgrade ; within a certain depth of subgrade near road surface, the variability of soil volume water content is basically consistent.