CN102681017B - Amplitude-frequency electric perspective detection method - Google Patents
Amplitude-frequency electric perspective detection method Download PDFInfo
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Abstract
The invention discloses an amplitude-frequency electric perspective detection method and belongs to a bottom plate detection technology of the working surface. A plurality of launching points and receiving points corresponding to the launching points are arranged in a launching laneway and a receiving laneway respectively, and the aquosity of a bottom plate of the working surface is detected by adopting a point-by-point launching and group-by-group receiving mode in an area composed of the launching points and the corresponding receiving points. A launching device and a receiving device are in independent split type, a timing and constant-current power supply working method is adopted, the number of detection devices and required detection workers is reduced, the labor intensity of the detection workers is reduced, the working efficiency and the quality of data obtained by detection are greatly improved, the technical effect in the aspect of evaluation of the whole aquosity of the bottom plate of the working surface is extremely obvious. Besides, two detection signals which are a high-frequency signal and a low-frequency signal can be adopted in the method simultaneously, contrast detection is performed according to the detecting environment conditions, optimal working parameters are selected preferably, and the detecting working effect is guaranteed.
Description
Technical field
The present invention relates to a kind of floor undulation Detection Techniques, belong to geophysical survey field, particularly a kind of amplitude-frequency electricity perspective detection method.
Background technology
Gushing water, is the second largest killer who threatens China's coal-mine safety, and its extent of injury is only second to gas accident.1995～2006 years, there are 1424 of all kinds of water inrush accidents in the whole nation, dead 5432 people, and economic loss is over 20,000,000,000 yuan.Three and half months on the 16th May 29 to September in 2011, nearly 12 of the colliery water leak accidents of national security supervision general bureau circular, 11 of fatal accidents, flood 1, well, 5 of the above accidents of dead 10 people.
Except driving gushing water, the economic loss that working face extraction gushing water causes is the hugest.
China is usually used in the detection method that under coal mine, gushing water is constructed now has: probing, ground physical prospecting and down-hole physical prospecting.Probing mainly refers to down hole drill, and for the tunnel forward probe of meeting head on, directly perceived, clearly, it is very clear that whether there is water or not.But its shortcoming is also very outstanding, and do not consider the factors such as duration, cost, it is surveyed, range of control is little, is only " a peephole view ", sometimes holes apart from water body and only has several meters far also cannot lean out, and easily missing gushing water hidden danger is its fatal weakness.And due to underground construction, to face hydraulic pressure large, exists high pressure underground water along boring, to give prominence to, lead to the risk of secondary accident.
Ground physical prospecting comprises 3-D seismics, transient electromagnetic, electrical method etc., due to method self limitation and be subject to that landform changes, objective body buried depth affects greatly etc., not only resolution cannot meet need of production, Effect on Detecting is undesirable, sometimes even cannot carry out the work.
Mine electrical method, radiowave tunnel perspective, slot wave earthquake, R wave, geological radar, TSP etc., aspect underground for probing water, spy structure, respectively have superiority, also there is certain effect, but to, for whole floor undulation property of water-bearing detection aspect, all there is all deficiencies or defect.Radiowave tunnel perspective, slot wave earthquake, can visit structure but can not visit water; R wave, geological radar directionality are good, but it is little, insensitive to water to find range; Amplitude-frequency electricity is had an X-rayed water sensitive, aspect the whole property of water-bearing of detection operations face base plate, and successful.
At present, domestic more employing VOICE FREQUENCY ELECTRIC PERSPECTIVE TECHNIQUE technology, but this technology can not realize long-time constant current-supplying, can not form constant supply current field, affect the quality of data, and launch party and take over party to get in touch with by wire telephony, the parameters such as transmitter current, potential difference (PD) are recorded in pointwise agreement Measuring Time, pointwise report, pointwise, number of devices is many, and job step is loaded down with trivial details, and work efficiency is low.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of for before working face extraction, guarantee in floor undulation certain limit that the geologic anomaly situations such as (1/2 adopt wide) base plate property of water-bearing survey new, efficiently, geophysical prospecting method accurately.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of amplitude-frequency electricity perspective detection method, comprises the following steps:
(1), erecting equipment
A, calibration equipment: according to workplace actual conditions, determine transmitting tunnel and receive tunnel; The timer that will transmit is synchronously checked with reception signal timer, and transmitter and receiving equipment are debugged;
The installation of b, transmitter: move towards, according to predetermined space, n(n>1 be set in transmitting Nei Yan tunnel, tunnel) individual launching site Ai(i=1,2,, n), will produce detectable signal and be arranged on launching site Ai to the transmitter that receives tunnel transmission detectable signal;
The installation of c, receiving equipment: receiving Nei Yan tunnel, tunnel trend, the acceptance point that receives detectable signal is set in precalculated position, for each the launching site Ai in transmitting tunnel, m(m>2 is set) individual corresponding acceptance point, the receiving equipment that receives detectable signal and detectable signal is stored is arranged on acceptance point;
(2), measure
First, start simultaneously and transmit timer and receive signal timer, meanwhile start transmitter and receiving equipment;
In transmitting tunnel, transmitter is with reference to transmitting timer, at predetermined launching site Ai, predetermined launch time, by scheduled unit power-on time, transmission interval and prearranged signals frequency emission detection signal and record this detectable signal, meanwhile, in receiving tunnel, by receiving equipment, at the m corresponding with a launching site Ai acceptance point, successively receive detectable signal and record the detection information receiving;
After the signal from launching site Ai being received in receiving tunnel, in synchronous change transmitting tunnel, the position of corresponding acceptance point in the position of launching site and reception tunnel, surveys in the manner described above;
In all launching site in transmitting tunnel and reception tunnel, after the detectable signal end of transmission (EOT) of corresponding acceptance point, will launch tunnel and exchange with receiving tunnel, re-start in the manner described above detection;
After detection finishes, during by detection, the data of record are processed, and obtain the geologic anomaly situation of search coverage.
Distance between described launching site Ai is greater than 50m.
Distance between described acceptance point is greater than 5m.
Transmitter in described transmitting tunnel comprises and produces the transmitter of detectable signal, the emitting electrode that detectable signal is launched and for the remote electrode of ground connection, described transmitter, remote electrode and one of them emitting electrode form the launching circuit that constant supply current can be provided.
In described transmitting tunnel, the unit power-on time of launching circuit is 10-15 minute, and supply current is greater than 100mA, and is constant current-supplying.
Described remote electrode is at least the face width of 3 times apart from the distance of each launching site Ai.
Receiving equipment in described reception tunnel comprises the receiver of storage detection signal and for receiving the receiving electrode group Mn of detectable signal, Nn; Described receiver and receiving electrode group form receiving loop.
Described receiving electrode group Mn, Mn in Nn, Nn two electrodes move towards to arrange perpendicular to tunnel and spacing is greater than 1m.
Each receiving electrode group Mn, the spacing along tunnel trend between Nn is 10m.
The beneficial effect that adopts technique scheme to obtain is as follows:
In measuring process of the present invention, transmitter and receiving equipment are independent split type, preengage the measurement of regularly fixing a point to cross, greatly reduced number of devices and required staff's quantity, alleviated staff's labour intensity, improved detection operations efficiency and detection data quality, fairly obvious at technique effect aspect the whole property of water-bearing evaluation of floor undulation; Wherein transmitter constant current-supplying can produce continual and steady current field in stratum, has improved the quality of surveying the data obtained; And the present invention can adopt two kinds of detectable signals of high and low frequency, and carries out ratio detection according to acquisition environment condition simultaneously, preferably optimum working parameter, has guaranteed detection operations effect.
Accompanying drawing explanation
Fig. 1 is metering system schematic diagram of the present invention;
Fig. 2 is the detection schematic diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with Fig. 1 and Fig. 2, describe the present invention.
Utilizing before amplitude-frequency electricity perspective detection method surveys, the equipment cleaning that affects result of detection in the tunnel that needs are surveyed is clean; Stopping work, have a power failure in the upper and lower tunnel of workplace, in tunnel, can not have large vibration and sound; Gas does not exceed standard; Tunnel free space is wanted enough large (vertical working direction base plate free space is not less than 1.0m), can not have ponding and metal object accumulation on a large scale in investigative range; Roadway floor is clean, without a large amount of float coal, scum silica frost.
Put in order after the environment of tunnel, just start to survey, mainly comprise the following steps:
(1), erecting equipment
A, calibration equipment: the transmitting of detectable signal is carried out in the upper and lower tunnel of workplace respectively with reception, moving towards of upper and lower tunnel is identical, according to actual detection needs, determines transmitting tunnel and receives tunnel, Ruo Shang lane is transmitting tunnel, descends so lane just for receiving tunnel; Firing operation personnel and the launch time, unit power-on time, transmission interval, equipment frequency of operation (signal frequency) etc. that receive operating personnel and start to need in the past to appoint at life's work detectable signal, therefore need to be by the used timer and receive signal timer and synchronously check of transmitting separately; Then the transmitter of having debugged and receiving equipment are transported to transmitting tunnel and receive tunnel.
The installation of b, transmitter: described transmitter comprises and produces the transmitter of detectable signal, the emitting electrode that detectable signal is launched and for the remote electrode of ground connection, remote electrode is arranged in apart from least 3～5 times of workplaces of each launching site Ai and adopts wide position, guarantees that remote electrode and emitting electrode ground connection are good; In transmitting Nei Yan tunnel, tunnel, move towards, according to predetermined space, n(n>1 be set) individual launching site Ai(i=1,2 ..., n), the spacing between adjacent transmission point is generally greater than 50m, is generally 50m-70m; Emitting electrode is arranged on to launching site Ai upper, the emitting electrode on transmitter, remote electrode and certain launching site Ai forms launching circuit by supply lines exact connect ion;
When arranging emitting electrode and remote electrode, should guarantee that electrode is away from beyond the ferrous material equipment such as track, scraper conveyer and local ponding 1m.
The installation of c, receiving equipment: described receiving equipment comprises the receiver of storage detection signal and for receiving the receiving electrode group Mn of detectable signal, Nn, Mn, Nn are two connected receiving electrodes; Receiving Nei Yan tunnel, tunnel trend, the acceptance point that receives detectable signal is being set in precalculated position according to predetermined space, distance between acceptance point is greater than 5m, each launching site Ai in transmitting tunnel, arranges m(m>2 according to predetermined space) individual corresponding acceptance point; Receiving electrode group is arranged on acceptance point, receiver and be positioned at the receiving electrode group Mn on acceptance point, Nn exact connect ion forms receiving loop; Each receiving electrode group Mn, Mn in Nn, Nn two electrodes move towards to arrange perpendicular to tunnel and spacing is greater than 1m; Each receiving electrode group Mn, the spacing along tunnel trend between Nn is 10m.
(2), measure
First, for synchronism and the accuracy that guarantees to survey, need to start simultaneously and transmit timer and receive signal timer, meanwhile start transmitter and receiver;
In transmitting tunnel, staff is with reference to transmitting timer, at predetermined launching site Ai, utilize transmitter emission detection signal and send by the emitting electrode being positioned on launching site Ai within predetermined launch time by predetermined unit power-on time, transmission interval and signal frequency etc., record the parameters such as constant current value in the position, signal transmission time, sigtnal interval, launching circuit of launching site Ai and detectable signal frequency simultaneously.For example, the morning 8:00 detectable signal that to start in first launching site A1 transmission frequency be 45Hz, on each launching site, the duration of detectable signal is 10 minutes, during detectable signal sends, receives the detectable signal reception work that has needed all acceptance points corresponding with A1 in tunnel.Between adjacent transmission point, free time is 5 minutes, be that detectable signal stops after a upper launching site continues 10 minutes, in ensuing 5 minutes, emitting electrode on transmitter and next launching site need to be formed to launching circuit, then at the 15th minute, start to continue the transmitting detectable signal of 10 minutes.In whole detectable signal emission process, the supply current in launching circuit is steady state value.
Meanwhile, in receiving tunnel, predetermined launch time, according to transmission interval, signal frequency by the receiving electrode group Mn on the m corresponding with a launching site A1 acceptance point, Nn receives detectable signal one by one, receiving electrode group Mn, Nn is sent to receiver by the detectable signal receiving, and receiver is recorded the detection information receiving, and records pole span and the actual measurement potential difference (PD) of respectively organizing receiving electrode group.Corresponding with the operation in above-mentioned transmitting tunnel, first, first group of receiving electrode group (M1, N1) and receiver are formed to receiving loop, receiver the morning 8:00 start to receive the detectable signal of 45Hz, record after desired data, receiver and first group of receiving electrode group (M1, N1) are disconnected, and with second group of receiving electrode group (M2, N2) form receiving loop, within 10 minutes, will receive detectable signal by the receiving electrode group on corresponding all acceptance points; Since the 10th minute, in ensuing 5 minutes, adjust the position of receiving electrode group, be set on the acceptance point corresponding with next launching site, since the 15th minute, on the new acceptance point of arranging, receive the detection information from next launching site.By this rule, until the detectable signal on each acceptance point corresponding with all launching site all receives.
After the signal from launching site Ai being received in receiving tunnel, in the transmitting tunnel of synchronous change, the position of corresponding acceptance point in the position of launching site and reception tunnel, proceeds to survey in the manner described above; ; after communication between launching site A1 and each acceptance point corresponding with A1; the emitting electrode and the transmitter that are positioned on launching site A1 are disconnected; the emitting electrode and the transmitter that are positioned on launching site A2 are formed to launching circuit; simultaneously; also by the emitting electrode group Mn receiving in tunnel, Nn is set on the acceptance point corresponding with A2 and receives.
In all launching site in transmitting tunnel and reception tunnel, after the detectable signal end of transmission (EOT) of corresponding acceptance point, will launch tunnel and exchange with receiving tunnel, re-start in the manner described above detection.In order to guarantee the integrality of search coverage and the accuracy of detecting structure, the exchange of two tunnels need to be about to original transmitting tunnel as receiving tunnel, reception tunnel is originally as transmitting tunnel, then surveys according to above-mentioned steps.
After whole detection process finishes, during by detection, the data of record are processed, thereby obtain the geologic anomaly situation of search coverage (being workplace). these data are processed accordingly, make as required various isogram section figure, thereby obtain the analysis chart of various abnormal conditions in search coverage geology.
In detection process, launching site A1, A2 ... An can be positioned on the same straight line of parallel roadways trend.
In detection process, in order to guarantee detection accuracy, each launching site Ai wants corresponding m group acceptance point, m should be at least 3, a launching site is at least answered corresponding 3 acceptance points, the optimal way of the position relationship of acceptance point and launching site is: take launching site as reference point, be positioned at the acceptance point at center and the line of launching site and should be parallel to the tunnel plane of meeting head on, remaining acceptance point should lay respectively at the left and right sides of this acceptance point.
In detection process, as need to be adjusted the position of launching site because of the local ponding in tunnel time, should record in time concrete adjustment content.In receiving tunnel, along vertical working, move towards, by predetermined spacing, at acceptance point, be arranged to right receiving electrode group (M1 successively, N1), (M2, N2) ..., Mn, Nn take launching site in the delta-shaped region that summit, all acceptance points form, receiver is at the signal transmission time of prior agreement, receive the detectable signal from launching circuit by group, and records receiving electrode group Mn on each acceptance point, the pole span of Nn, actual measurement potential difference (PD).If causing the potential difference (PD) of the receiving electrode group on the potential difference (PD) of the receiving electrode group on certain acceptance point acceptance point corresponding to other while running into catastrophe point in measuring process compares while having larger error, must make the best use of time to carry out repetition measurement, if the error of the result of repetition measurement and former measurement result is greater than 5%, carry out repeatedly repetition measurement or after work comes to an end, mend survey, until the error between measured result is less than 5%, this measurement result is just valid data.
The frequency that receiver transmits should to receive the frequency of signal consistent with receiver, like this validity of guarantee data.
Embodiment
Fig. 2 utilizes the achievement schematic diagram of method of the present invention to north, huge ore deposit, energy east well 9208 workplace amplitude-frequencies detections in Ji;
Huge ore deposit, east north well 9208 fully-mechanized mining working masters adopt Taiyuan group 9# coal, and 9# coal is apart from underliing only 35m of gray area strong aquifer end face difficult to understand.On 27 days～November 30 October in 2009, Hebei Coal Mining Research Institute adopts Integrated Geophysical Prospecting, and 9208 workplaces are carried out to detection and evaluation.
This work face length 1080m, wide 70m.In the present embodiment, in transmitting tunnel, along tunnel, move towards every 60m and arrange a launching site, in receiving tunnel, along the every 10m of vertical working direction, an acceptance point is set; The corresponding reception of each launching site lane segment length is 150m, and corresponding approximately 15 acceptance points of each launching site, amount to and arrange 36 emitting electrodes, approximately 530 groups of receiving electrode groups.The unit power-on time of launching circuit is made as 10 minutes, the station transfer time (signal transmission interval) is 5 minutes.In tunnelling, do not disclose a tomography, structural environment is simple.The signal frequency of transmitter and receiver is consistent, and the steady current in launching circuit is 150mA.
The explanation curve obtaining according to amplitude-frequency electricity perspective detection method is known, and it is moisture abnormal that whole workplace is drawn a circle to approve 2 places altogether.
On November 15th, 2010, back production 680m, enter physical prospecting 2# exceptions area Water Inrush accident, water yield 1800m occur
3/ h, workplace is flooded.
Because early stage is according to Use of Geophysical Data, to workplace control water security, specific aim deployment has been done in work, with effective measures, guarantees that casualties situation does not appear in this gushing water.
It is example that embodiment Middle East Pang Kuang north well 9208 workplaces of take are surveyed, and adopts audio-frequency electricity perspective method need to be equipped with professional detection personnel 7 people, while consuming chief engineer 280.0; While adopting amplitude-frequency of the present invention electricity perspective detection method need use detection personnel 5 people, consumption chief engineer 97.5.Method of the present invention is compared with conventional audio electricity scenography, and accumulative total is saved 182.5 of man-hours, and work efficiency has improved 1.87 times.
If the time that consider because increasing the wiring, the take-up that bring working day, go into the well, the operation such as gug is brought increases, work efficiency improve will 3-4 doubly more than.
Table 1 is amplitude-frequency electricity perspective detection method and VOICE FREQUENCY ELECTRIC PERSPECTIVE TECHNIQUE method construction used time contrast table.
In this embodiment, transmitter and receiver all adopts WDJF-1 type numeral amplitude-frequency induced polarization instrument, bifrequency transmitting, constant current-supplying.The equipment receive mode used receiving in tunnel is parallel one pole-double distribution method.Therefore, the method is a tunnel transmitting, receives and transmits simultaneously in the certain limit in another tunnel.
In this embodiment, the principal feature of transmitter is to measure frequency many (4Hz, 4/13 Hz; 8Hz, 8/13 Hz; 16Hz, 16/13 Hz; 32Hz, 32/13 Hz), emissive power large (800V * 1A constant current), antijamming capability be strong, can realize double frequency launches simultaneously, receives, (the unit continued power time surpasses 10min to long-time constant current-supplying, power supply design can further extend as required), can keep long-time measurement.
In the present embodiment, transmitter and receiving equipment adopt separate split-type structural, transmit and receive respectively and carry out in two tunnels.According to making an appointment, in transmitting tunnel regularly, fixed point, determine frequency, constant current is launched, in receiving the corresponding sector region in tunnel regularly, fixed point, determine frequency reception, transmitting, receive both sides without by mode pointwise contacts such as wire telephonys, pointwise is reported and record the parameters such as supply current, greatly simplified number of devices, alleviate labour intensity, improved work efficiency.
Table 1
Claims (9)
1. amplitude-frequency electricity is had an X-rayed a detection method, it is characterized in that comprising the following steps:
(1), erecting equipment
A, calibration equipment: according to workplace actual conditions, determine transmitting tunnel and receive tunnel; The timer that will transmit is synchronously checked with reception signal timer, and transmitter and receiving equipment are debugged;
The installation of b, transmitter: move towards, according to predetermined space, n(n>1 be set in transmitting Nei Yan tunnel, tunnel) individual launching site Ai(i=1,2,, n), will produce detectable signal and be arranged on launching site Ai to the transmitter that receives tunnel transmission detectable signal;
The installation of c, receiving equipment: receiving Nei Yan tunnel, tunnel trend, the acceptance point that receives detectable signal is set in precalculated position, for each the launching site Ai in transmitting tunnel, m(m>2 is set) individual corresponding acceptance point, the receiving equipment that receives detectable signal and detectable signal is stored is arranged on acceptance point;
(2), measure
First, start simultaneously and transmit timer and receive signal timer, meanwhile start transmitter and receiving equipment;
In transmitting tunnel, transmitter is with reference to transmitting timer, at predetermined launching site Ai, predetermined launch time, by scheduled unit power-on time, transmission interval and prearranged signals frequency emission detection signal and record this detectable signal, meanwhile, in receiving tunnel, by receiving equipment, at the m corresponding with a launching site Ai acceptance point, successively receive detectable signal and record the detection information receiving; Described detection information is receiving electrode group Mn on each acceptance point, the pole span of Nn, actual measurement potential difference (PD);
After the signal from launching site Ai being received in receiving tunnel, in synchronous change transmitting tunnel, the position of corresponding acceptance point in the position of launching site and reception tunnel, surveys in the manner described above;
In all launching site in transmitting tunnel and reception tunnel, after the detectable signal end of transmission (EOT) of corresponding acceptance point, will launch tunnel and exchange with receiving tunnel, re-start in the manner described above detection;
After detection finishes, during by detection, the data of record are processed, and obtain the geologic anomaly situation of search coverage.
2. a kind of amplitude-frequency electricity perspective detection method according to claim 1, is characterized in that the distance between described launching site Ai is greater than 50m.
3. a kind of amplitude-frequency electricity perspective detection method according to claim 1 and 2, is characterized in that the distance between described acceptance point is greater than 5m.
4. a kind of amplitude-frequency electricity according to claim 1 is had an X-rayed detection method, it is characterized in that transmitter in described transmitting tunnel comprises produces the transmitter of detectable signal, the emitting electrode that detectable signal is launched and for the remote electrode of ground connection, described transmitter, remote electrode and one of them emitting electrode form the launching circuit that constant supply current can be provided.
5. a kind of amplitude-frequency electricity perspective detection method according to claim 4, is characterized in that the unit power-on time of launching circuit in described transmitting tunnel is 10-15 minute, and supply current is greater than 100mA, and is constant current-supplying.
6. according to a kind of amplitude-frequency electricity perspective detection method described in claim 4 or 5, it is characterized in that described remote electrode is at least the face width of 3 times apart from the distance of each launching site Ai.
7. according to a kind of amplitude-frequency electricity perspective detection method described in claim 1 or 4, it is characterized in that receiving equipment in described reception tunnel comprises the receiver of storage detection signal and for receiving the receiving electrode group Mn of detectable signal, Nn, described receiver and receiving electrode group form receiving loop.
8. amplitude-frequency according to claim 7 electricity perspective detection method, is characterized in that described receiving electrode group Mn, and in Nn, Mn, Nn two electrodes move towardss layout perpendicular to tunnel and spacing is greater than 1m.
9. amplitude-frequency electricity perspective detection method according to claim 7, is characterized in that each receiving electrode group Mn, Nn, and a spacing along tunnel trend is 10m.
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| CN103105626B (en) * | 2013-01-25 | 2015-10-21 | 湖南继善高科技有限公司 | A kind of multi frequency induced polarization instrument system suppressing phase drift and coupled noise |
| CN103235344B (en) * | 2013-04-07 | 2015-08-26 | 淮南矿业(集团)有限责任公司 | Two lanes multi-electrode electricity perspective detection system |
| CN103969691A (en) * | 2014-04-30 | 2014-08-06 | 安徽理工大学 | Mine working face detection system and method |
| CN108508492B (en) * | 2018-05-16 | 2019-12-17 | 中国煤炭地质总局勘查研究总院 | High-density resistivity measurement system for stabilizing current field and current field stabilizing method |
| CN109297396B (en) * | 2018-11-20 | 2021-06-08 | 内蒙古伊泰京粤酸刺沟矿业有限责任公司 | Method and system for detecting position of drill hole in roadway |
| CN110954961B (en) * | 2019-11-22 | 2022-07-12 | 山西晋煤集团技术研究院有限责任公司 | Large-sector mine working face radio wave penetration system and method |
| CN111458757A (en) * | 2020-04-10 | 2020-07-28 | 陕西省煤田物探测绘有限公司 | Mine underground electric construction process |
| CN113504572B (en) * | 2021-08-23 | 2023-09-29 | 西安西北有色物化探总队有限公司 | Method for enhancing grouting effect of base plate of working face by audio frequency electro-perspective method |
| CN113866833A (en) * | 2021-10-27 | 2021-12-31 | 河北煤炭科学研究院有限公司 | Method for detecting narrow working face and irregular working face by amplitude-frequency electric perspective technology |
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