时域反射法测定黄土含水量的标定试验研究

doi:10.13722/j.cnki.jrme.2014.1159

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摘要为了提高TDR法测定黄土含水量的精度，对TDR土壤水分传感器进行了标定试验，分别通过TDR法与烘干法测定Q3黄土和古土壤的含水率并进行对比分析，探讨了干密度、结构性和土质差异对TDR土壤水分传感器测试结果的影响，并建立了相关数学修正模型。试验结果表明，TDR法含水率测量值较烘干法偏高，干密度变化对TDR法测量结果的影响不可忽略；通过建立考虑干密度影响的经验修正模型对TDR法测量值进行修正，当体积含水率9.2%≤θw≤39.9%时，误差可控制在2%以内，当39.9%≤θw≤46.3%时，误差可控制在3%以内，总体修正效果优于TDR法与烘干法测量数据通过三次曲线拟合建立的修正公式；土的结构性对TDR法测量结果影响不明显，可采用重塑土的室内标定试验代替现场标定试验；黄土与古土壤因土质差异，应分别建立修正模型。

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关键词 ：时域反射法, 黄土, 体积含水率, 标定试验

Abstract：The calibration test had been carried out to improve the accuracy of Time Domain Reflectometry (TDR) sensor measurements. The effect of dry density，structure properties and soil texture on soil-water content measured with the TDR sensor is explored，and the related mathematic correction models are established，on the basis of the comparative analysis of soil-water content of Q3 loess and paleosol measured by TDR sensor and oven-drying method. The test results indicate that，the use of the factory-supplied parameters resulted in overestimation of soil-water content compared to the oven-drying soil-water content，and the effect of dry density variation on the sensor measurements should not be neglected；The correction model of TDR sensor soil-water contents is established by considering the effect of dry density. It is proved that the correcting results of using the correction model is superior to the cubic fitting equation of regression analysis between θv and θw determined in the laboratory，and when the volumetric water content range is from 9.2% to 39.9%，the adjusted soil-water content is within 2%，and within 3% when the volumetric water content range is from 39.9% to 46.3%. No statistically significant difference of soil-water contents was observed between the undisturbed and the remoulded samples，and therefore the calibration test in laborary can substitute for in situ test；there are notable differences between loess and paleosol in soil texture and therefore the calibration model should be established respectively.

Key words： time domain reflectometry loess volumetric water content calibration test

引用本文:

于永堂1，2，张继文1，郑建国1，2，刘争宏1. 时域反射法测定黄土含水量的标定试验研究[J]. 岩石力学与工程学报, 2015, 34(07): 18-18.
YU Yongtang1，2，ZHANG Jiwen1，ZHENG Jianguo1，2，LIU Zhenghong1. CALIBRATION OF A TIME DOMAIN REFLECTOMETER FOR DETERMINING WATER CONTENT OF LOESS. , 2015, 34(07): 18-18.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.1159 或 http://www.rockmech.org/CN/Y2015/V34/I07/18

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