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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。
Firstly, the basic principle of Frequency Domain Reflectometry (FDR) for measuring soil moisture is introduced. Then, the volumetric water content of Xi’an loess with compaction degree of 95% was calibrated by laboratory, and the calibration curve was obtained. Finally, the actual application of the built-in indoor subgrade model is carried out. The results show that for the subgrade soil with volumetric moisture content between 27% and 42%, the absolute error between the FDR measurement and the drying method is less than 2% and the relative error is about 1% Buried way of water measurement has little effect. It is considered that the FDR technology can accurately, rapidly and continuously observe the subgrade soil moisture content. The transverse insertion mode is more reasonable and meaningful.