摘要
首先介绍了FDR(Frequency Domain Reflectometry)频域反射用于测量土壤水分的基本原理。接着对压实度为95%的西安黄土体积含水率进行了实验室标定,得出了标定曲线。最后在建成的室内路基实物模型中进行了实际应用。分析结果显示:对于体积含水率在27%至42%之间的路基土,FDR测量结果和烘干法测量结果的绝对误差在2%以内,相对误差在1%左右,横插和竖插两种埋设方式对水分的测量影响不大。认为:FDR技术可以准确、快速和连续地观测路基土壤含水率;横插方式更为合理和有意义。
First,a theory of the measurement of soil water content by FDR（Frequency Domain Reflectometry）is introduced.Second,a calibration experiment processes of the measurement of soil volumetric water content are described in detail.This calibration experiment is based on loess samples collected in Xi＇an at compactness of 95%,and the calibration curves of the FDR is achieved.Last,the application of site monitoring in an indoor roadbase model is introduced.Analysis result indicates that the absolute deviation between the measured values of FDR and the oven drying method is below 2% and relative deviation is below 1% for boadbase soil soil volumetric water content from 27% to 42%;the inserting methods,including transverse inserting and vertical inserting,have little effect with the values.It is sure that FDR technology is able to carry out the moisture content monitoring of loess subgrade quickly and continuously,and the transverse inserting is more reasonable.
出处
《公路》
北大核心
2011年第5期142-147,共6页
Highway
关键词
FDR
标定
体积含水率
黄土路基
FDR
calibration
soil volumetric water content
loess subgrade
