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Bipolar-bipolar detection method for mine working face floor strata

A detection method and a working face technology, applied in testing machinery, earthwork drilling and mining, etc., can solve the problems of increasing power supply current, reducing data reliability, and large interference, so as to increase the measurement signal, overcome the weak detection signal, increase the high intensity effect

Inactive Publication Date: 2006-09-06
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

Due to the special geological conditions in the underground, when the "dipole-dipole" method is used for detection, the detection signal is very weak due to the small distance between the power supply electrode and the measurement electrode. In addition, the underground electrical interference is large, and the reliability of the data is greatly improved. reduced, resulting in low reliability of observation results, seriously affecting the application of technical methods
To overcome this deficiency, it is necessary to increase the power supply current to enhance the observation signal, because increasing the current will cause safety hazards, which is not allowed in mines

Method used

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  • Bipolar-bipolar detection method for mine working face floor strata
  • Bipolar-bipolar detection method for mine working face floor strata

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Embodiment

[0019] Example: The coal in a mine is within the range of the 3901 working face. Due to the influence of layer slip and faults, the distance between the three ash, the ten lower ash and the Austrian ash is reduced. The distance between the upper coal floor and the Austrian ash is reduced to 80-130 meters, and the Austrian lime karst develops into a strongly confined aquifer, which poses a certain threat to the safe mining of the upper coal. In order to find out the water content of the upper coal floor and whether there is an original guide channel for the confined water, the "bipolar-bipolar" method was used to detect the water content of the roadway floor in the return air lane and the transportation lane of the 3901 working face. . The imaging effect image reversed by the resistivity CT method is as follows figure 2 shown by figure 2 It can be seen that there are two low-resistance anomalies in zone 1 and zone 2 on the floor of the working face, that is, water-bearing z...

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Abstract

The invention discloses a dual-pole-dual-pole detecting method of mine working surface bottom plate terrane, which arranges the power electrodes A and B into one channel, while their midpoint is 01; powers the AB and measure the current I between AB; arranges the measuring electrodes M and N in another channel while their midpoint is 02; measures the voltage ªñU between them; and fixes AB to keep the MN length; moves MN distantly; therefore, the connecting line of 01 and 02 can scan a certain area to form a sector; keeps the AB length to move it to another position and repeat the operation; therefore, said connecting line can scan a certain area to form another sector; moves to the whole channel to complete the measurement. According to measured data, the invention uses resistance CT method to reversely calculate and process image treatment to accurately set the water content and structure of working surface bottom plate terrance. The invention has the advantages as strong detecting signal, less safe hidden, and high detecting accuracy.

Description

technical field [0001] The invention relates to a method for detecting the bottom plate of the working face in mining engineering, in particular to a "bipolar-double" method for detecting the structural state of the bottom plate of the working face or geological structures such as inclusions, caves, and water-bearing bodies in the working face. Pole" detection method. Background technique [0002] At present, the "dipole-dipole" method is mainly used to detect geological anomalies in the floor of the working face in underground mines. one-third. Due to the special geological conditions in the underground, when the "dipole-dipole" method is used for detection, the detection signal is very weak due to the small distance between the power supply electrode and the measurement electrode. In addition, the underground electrical interference is large, and the reliability of the data is greatly improved. Therefore, the reliability of the observation results is low, which seriously...

Claims

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Application Information

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IPC IPC(8): E21C39/00
Inventor 程久龙
Owner SHANDONG UNIV OF SCI & TECH
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