Advanced detection method for focusing chromatography induced polarization of underground engineering
A technology of underground engineering and focused tomography, which is applied in geophysical surveying, measuring devices, electric/magnetic exploration, etc., can solve the problems of inability to obtain three-dimensional information of geological bodies, extract useful information, and small detection distance, etc., and achieve good advances Detecting directivity, solving serious side interference, and realizing the effect of three-dimensional positioning
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[0040] Taking a certain tunnel as an example, the section of the tunnel is arched, with a span of 12m and a height of 10m. There is water gushing near the mileage YK123+672, and there may be a water-bearing structure ahead. In order to ascertain the geological conditions ahead and provide basis and guidance for construction, the focused tomography induced polarization method is used for advanced detection.
[0041] (1) The specific working method is as follows: Figure 2a , b, c shown. Arrange a circle of 8 shielding electrodes A at equal intervals on the contour line of the tunnel face 1 , arrange two parallel measuring lines L at heights of 2m and 6m from the tunnel floor 1 , L 2 , the number of electrodes arranged on each measuring line N 1 =N 2 = 15; power supply electrode A 0 and receiving electrode M 1 , M 2 placed on line L 1 , L 2 , the other power supply electrode B is placed on the bottom plate of 150m, and the receiving electrode N is placed on the bottom ...
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