三针式TDR探头测试区域范围分析及试验验证

发布时间：2018-02-27 14:18

本文关键词： 时域反射法三针式探头测试范围渗流分析 Geostudio　出处：《岩土工程学报》2014年04期 　论文类型：期刊论文

【摘要】：在时域反射法(TDR)测试系统中,三针式探头作为应用最广泛的探头形式,其测试区域范围的确定是工程应用中一个重要问题。通过对比分析麦克斯韦方程及地下水渗流方程,利用岩土工程中常用的地下水渗流软件(如:Geostudio软件中SEEP/W模块)对一典型的三针式TDR探头测试区域范围进行计算,并设计了专门的试验对计算结果进行验证。结果显示:①地下水渗流分析软件对三针式TDR探头测试区域范围的计算结果与试验结果有较好的一致性;②三针式TDR探头的测试区域近似长半轴为33.0 mm、短半轴为20.7 mm的椭圆,且该区域内50%的电场能量集中在中间探针周围长半轴为10.7 mm、短半轴为8.7 mm的椭圆内,显示出较明显的"趋肤效应";③介质的电导率对三针式TDR探头测试范围基本无影响。通过该研究,提出了三针式TDR探头测试范围的计算方法,为工程或试验中该种探头的设计提供了指导。
[Abstract]:In the time domain reflection method (TDR) measurement system, the three-pin probe is the most widely used probe form, and the determination of the range of the test area is an important problem in the engineering application. The Maxwell equation and the groundwater seepage equation are analyzed by comparing the Maxwell equation and the groundwater seepage equation. Using the groundwater seepage software commonly used in geotechnical engineering (such as SEEP/W module in the 10% Geostudio software), the range of a typical three-pin TDR probe test area is calculated. A special test was designed to verify the calculation results. The results show that the calculation results of the test area range of the three-pin TDR probe by using the analysis software of groundwater seepage show a good agreement with the test results and the results of the two-and-three-pin TDR probe are in good agreement with the test results. The test area is approximately 33.0 mm for the long half axis and 20.7 mm for the short half axis. The electric field energy of 50% in this region is concentrated in the ellipse with 10.7mm long half axis and 8.7 mm short half axis around the intermediate probe. It is shown that the conductivity of the "skin effect" 3 medium has little effect on the testing range of the three-pin TDR probe. Through this study, a calculation method of the testing range of the three-pin TDR probe is proposed. It provides guidance for the design of this kind of probe in engineering or test.
【作者单位】：软弱土与环境土工教育部重点实验室(浙江大学);浙江大学岩土工程研究所;
【基金】：国家863计划课题(2012AA062601)
【分类号】：TU195

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