A method for laying small loop line tem in mountainous terrain and measuring points
A laying method and measuring point technology, which are applied in the field of electric and electromagnetic exploration, can solve the problems of decreased detection accuracy, the small loop TEM detection technology cannot give full play to mountain detection, and it is difficult to arrange horizontally, and achieve the effect of convenient construction.
Active Publication Date: 2016-02-24
JIANGSU UNIV
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Problems solved by technology
[0006] The flexible loop of small loop TEM is not easy to arrange horizontally in mountainous exploration, resulting in a decrease in detection accuracy; if the wire frame is solidified, it is not easy to carry, and the support or human body used for horizontal arrangement will also affect the measurement results , which also leads to the decline of detection accuracy, so that the small loop TEM detection technology cannot give full play to the advantages of mountain detection
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[0018] The solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0019] In the TEM exploration of a small loop line in a mountainous area, the measuring points are laid on a relatively gentle hillside, and the slope of the hillside is obtained by the general method of geodesy ( figure 2 ). One of the measuring points ( image 3 ) coordinates are (x, z) = (200m, 1260m), t = 5ms detection depth h = 120m, and the intersection angle between the hillside where the measuring point is located and the coordinate axis θ = 30°. From formula (1) we can see
[0020]
[0021] x'=x+hsinθ=200+120sin30°=260m(2)
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The invention discloses a small circle line transient electromagnetic (TEM) mountain land laying and measuring point returning method. A circle line is directly laid on a mountain slope by a square in the manner of avoiding topographical corners. Under rectangular coordinates, a computing method for a measuring point (x,z) and a returning point (x',z') is shown as follows: z'=z-(h+h'')=z-(hcos theta)+hsin theta tan theta)x'=x+hsin theta, wherein x is the coordinate of the measuring point relative to the starting point of a measuring line, y is the elevation of the measuring point, h is the TEM detecting depth at one point, and theta is an included angle between the mountain slope and the x axis of the coordinates. According to the method disclosed by the invention, very high detecting precision can be obtained without solidifying a wireframe; the wireframe can be conveniently carried; and the advantages of small circle line TEM mountain land detecting are fully exerted. The method can be applied to the field of geophysical prospecting, especially the field of electrical and electromagnetic prospecting.
Description
technical field [0001] The invention belongs to the field of geophysical prospecting, and in particular relates to an electric and electromagnetic prospecting method. Background technique [0002] Small loop TEM (Transient Electro-Magnetic, TEM) technology has the advantages of lightness, flexibility, high construction efficiency, and little influence by terrain in mountainous exploration [1] . However, the transmitting and receiving loops of the small loop TEM are mostly composed of flexible wires, and it is difficult to arrange the loops horizontally on the undulating surface, resulting in a decrease in detection accuracy; if the wire frame is solidified [2] , which is not easy to carry, supports or human bodies arranged horizontally will also affect the measurement results, which also leads to a decrease in detection accuracy. For this reason, a method for laying loops and homing measuring points that is convenient for mountain construction is designed. [0003] compar...
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IPC IPC(8): G01V3/00
Inventor 闫述陈明生
Owner JIANGSU UNIV