Self-explicit advanced detection method for abnormity of underground direct-current axial dipole dynamic source
A technology of advanced detection and dipole, applied in the field of electrical and electromagnetic prospecting, can solve the problems of weak, advanced detection interference, misjudgment, etc., achieve the effect of light equipment, low requirements for roadway length, and improve real-time performance
Pending Publication Date: 2022-01-04
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology
The method of fixing the transmitting electrode near the excavation face and moving the receiving electrode to the opposite direction of the excavation face will not only obtain weak anomalies, but also the abnormal body behind the excavation face will interfere with the advance detection and cause misjudgment
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Embodiment 1
[0036] This embodiment provides an advanced detection method for downhole DC axial dipole dynamic sources, as follows: figure 1 As shown, in this method, the receiving electrodes M and N are fixedly arranged on the excavation face, and the vertical bisector of the horizontal line connecting the receiving electrodes M and N is the vertical centerline of the excavation face, which is as close as possible to the geological anomaly in front of the excavation face, Avoid the influence of abnormal bodies near the roof, floor and side of the roadway; the emitter electrodes A and B are connected from A 1 B1 move along the centerline of the roadway floor to the direction of the excavation face at the interval required by the resolution, and the signal-to-noise ratio increases with the increase of the detection distance. 1 and B 1 location point, A 2 and B 2 location point, ..., A i and B i Location point..., A n and B n The dipole moving source at the position point; the transmi...
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The invention discloses a self-explicit advanced detection method for abnormity of an underground direct-current axial dipole dynamic source, and the method comprises the steps: enabling receiving electrodes M and N to be fixedly arranged on a tunneling surface, enabling a vertical bisector of a horizontal connecting line of the receiving electrodes M and N to be a vertical center line of the tunneling surface, enabling transmitting electrodes A and B to move from the position of A1B1 to the direction of the tunneling surface along the center line of a roadway bottom plate, and forming dipole moving sources at the positions of A1B1, A2B2,..., AiBi..., AnBn; enabling the transmitting electrode A and the transmitting electrode B to transmit current once at each position, enabling the receiving electrode M and the receiving electrode N to correspondingly measure voltage once, and carrying out dipole moving source advanced detection. When an abnormal body exists in front of the tunneling face, the receiving electrodes measure a signal exceeding the noise level, and therefore the abnormal body in front of the tunneling face can be rapidly judged on the construction site, the timeliness of advanced detection of an underground direct current method is improved, and data are provided for underground safe and rapid tunneling construction in time. According to the invention, the accuracy of underground direct current advanced detection is improved, and the method is a quick detection method for self-displaying abnormity by using the symmetry of a stable current field.
Description
technical field [0001] The invention belongs to the field of electrical and electromagnetic prospecting, and relates to a downhole direct current advance detection technology, in particular to a downhole direct current axial dipole dynamic source anomaly self-explicit type advance detection method. Background technique [0002] The advance detection of the underground direct current method is one of the main methods for the underground detection of abnormal bodies in front of the tunneling face in coal mines in my country. The current DC advanced detection method usually uses a monopole transmitter-dipole receiver device called the three-pole method, and the transmitter electrode is fixedly arranged on or near the excavation face, and the receiver electrode is moved away from the excavation face. Since then, there has been an improved multi-unipole-dipole combination method based on the three-pole method. Due to the short-distance effect of the DC electric field, the respon...
Claims
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IPC IPC(8): G01V3/26G01V3/38
CPCG01V3/26G01V3/38
Inventor 石显新
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP