Measuring device and measuring method thereof for seasonally frozen soil thickness
A measurement method and technology of measurement device, applied in electromagnetic measurement device, electric/magnetic thickness measurement, etc., can solve the problems of lack of uniqueness and inconsistent soil structure, and achieve the effect of high measurement accuracy
Active Publication Date: 2017-02-15
STATE GRID SICHUAN ECONOMIC RES INST +3
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Problems solved by technology
The soil model determined by this method is mathematically equivalent, and the solution obtained is a series of soil thickness and resistivity, which is not unique, so it does not match the actual soil structure. How to accurately measure the thickness of seasonally frozen soil is very necessary
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[0031] A method for measuring the thickness of seasonally frozen soil, comprising:
[0032] Drive two current poles in the permafrost area, namely A pole and B pole, and connect an adjustable power supply and current measuring device in series between A pole and B pole, wherein the distance between A pole and B pole is greater than 10 meters , the adjustable power supply can be DC or AC;
[0033] Drive probe C and probe D on the connecting line between pole A and pole B, and both probe C and probe D are located between the central axis of pole A and pole B and pole A, wherein probe C and pole A The distance between poles A is not less than 10 times the diameter of probe C and not greater than 20 times the diameter of probe C, and the depth of pole B buried in the soil is greater than 10 times the diameter of the probe;
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The invention discloses a measuring method for seasonally frozen soil thicknesses. The measuring method is based on a principle that ''resistivity of upper layer soil is much greater than that of lower layer soil in a seasonally frozen soil region, the increase of depth of a current electrode in two electrodes buried underground can lead to the decrease of potential difference between two points on the ground surface, and the grounding resistance declines sharply after the current electrode penetrates the upper layer frozen soil, thus a ground surface potential difference change rate decreases drastically'', solves the problem of seasonally frozen soil thickness measurement, is high in measurement precision, provides a reference for the grounding grid burial depth design, and can be further used for evaluating whether an existing grounding grid can meet safety requirements in a soil freezing season.
Description
technical field [0001] The invention relates to the field of electric grounding system measurement, in particular to a method for measuring the thickness of seasonal frozen soil. Background technique [0002] Due to the large change of ambient temperature, there is a seasonal freezing phenomenon in the upper soil in this area. After freezing, a high soil resistivity layer is formed in the upper soil, and compared with the non-freezing situation, the soil resistivity of this layer differs by several digits in different seasons. Ten to hundreds of times, resulting in a very large difference in the grounding resistance of the grounding grid in different seasons. The main indicators of grounding grid safety are grounding resistance, step voltage, and contact voltage. Freezing of the soil will cause the grounding resistance to rise, and the increase in grounding resistance will cause the potential of the ground grid to rise, which will cause the step voltage and contact voltage t...
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IPC IPC(8): G01B7/06
CPCG01B7/06
Inventor 罗琛严居斌蒲亮雷斌詹旻刘汉霄方雨菡杨峰张玉鸿唐杨曹晓斌马力郭璊
Owner STATE GRID SICHUAN ECONOMIC RES INST