CN110359959B - Method for rapidly measuring gas content and advance stress of coal face - Google Patents
Method for rapidly measuring gas content and advance stress of coal face Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 238000005553 drilling Methods 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000005065 mining Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
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- 238000005516 engineering process Methods 0.000 abstract description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
- E21F17/185—Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention discloses a method for rapidly measuring the gas content and the advance stress of a coal face, which comprises the steps of constructing a detection drill hole in a return air roadway towards the front of a coal seam, then respectively arranging an emission source and a detector in the coal wall of the coal face and the hole of the detection drill hole, wherein the emission source and the detector are positioned on the same horizontal line; when the working face is mined, the distribution of the gas content and the advance stress of the coal seam in front of the working face is rapidly and accurately detected by combining the quantitative change relation of the CT value, the advance stress and the gas content through an accurate CT detection technology.
Description
Technical Field
The invention relates to the field of gas extraction, in particular to a method for quickly measuring the gas content and the advance stress of a coal face.
Background
In recent years, with the increase of the mining depth and strength of a coal mine, the mining environment of the coal mine continuously deteriorates, a coal bed at a shallower part of a geological structure is more complex, the ground stress and the gas content of the coal bed are continuously increased, the air permeability of the coal bed is lower, gas extraction is extremely difficult, and great test is brought to the safety production of the coal mine. Due to the heterogeneous characteristics of the coal body, the coal body generates stress concentration points, and if the stress and the gas content in front of the working face are not measured and relieved in time, dynamic disasters such as coal and gas outburst and the like can be caused along with the excavation. The method accurately and timely determines the distribution condition of the coal seam gas content and the advance stress, and has important significance for coal seam gas extraction and safe production. Most of the existing methods for measuring the gas content of the coal face of the coal mine in China are mainly used for testing in a laboratory after field sampling, the method cannot accurately measure the gas content and the pressure distribution of the coal bed, and the error of a measuring result is large. The advance stress in front of the working face is mostly measured by drilling on site and then measuring by using a stress sensor, the method cannot well fix the sensor, the sensor is very easy to damage, and the error of the measuring result is large.
Disclosure of Invention
In view of the technical shortcomings, the invention aims to provide a method for rapidly determining the gas content and the advance stress of a coal face, which rapidly and accurately detects the gas content and the advance stress distribution of a coal seam in front of the coal face by scanning the gas content and the advance stress of the coal face by a transmitting source and receiving and processing by a detector and combining the quantitative change relationship between a CT value and the advance stress and the gas content.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a method for rapidly measuring the gas content and the advance stress of a coal face, which comprises the following steps:
a. firstly, arranging an emission source on the coal wall of a working face, wherein the emission source is electrically connected with a power supply;
b. constructing a detection drill site in a coal seam in a working face air return roadway, and constructing a plurality of detection drill holes in the detection drill site according to a certain angle and a certain distance in front of the working face after calculation and measurement according to the position of an emission source, so as to ensure that all the detection drill holes and the position of the emission source are in the same plane;
c. the method comprises the following steps that detectors are respectively placed in detection drill holes, the detectors are respectively and electrically connected to a digital-to-analog converter, the digital-to-analog converter is electrically connected with a display, and the detectors, the digital-to-analog converter and the display are respectively and electrically connected with a power supply;
d. starting an emission source and a detector, transmitting X rays or vibration waves to the coal seam by using the emission source, receiving an emission source signal by using the detector, and detecting the coal seam gas content and the advance stress within the range of 20-30 m in front of a working face;
e. after the detector calculates the digital-to-analog conversion of the received wave source through the digital-to-analog converter, the display displays the gas content and the corresponding CT value of the lead stress within the range of 20-30 m in front of the working surface;
f. and further obtaining the distribution of the coal seam gas content and the advanced stress within the range of 20-30 m in front of the coal face according to the quantitative change relationship between different gas contents and different stresses tested in the laboratory and the CT value.
g: determining abnormal areas of the gas content and the advanced stress according to the measured gas content and the advanced stress distribution, and then eliminating the danger of the abnormal areas through measures of drilling hole pre-pumping, pressure relief and permeability increase;
h: and (e) repeating the steps a to g when the working face is mined to 5m before the cutoff of the measuring range, and continuously measuring the gas content and the advance stress of the working face until the mining of the working face is finished.
Preferably, the number of the detection boreholes and the detectors in the step b are 5.
Preferably, the drilling angle in step b is set as a, and the calculation method is as follows: firstly, determining the position of an emission source, setting the distance from the emission source to an air return roadway as L1, secondly, constructing a detection drill site in the air return roadway, setting the distance from the emission source to a working surface as L2, setting the required distance from a detector to the emission source as L3, and calculating the drilling angle a of a detection drill hole as follows:
preferably, the calculation formula of the length of the detected borehole in step b is:
preferably, the distance L3 between the detector and the emission source is determined by combining the parameters of the air permeability of the coal seam, the magnitude of the ground stress and the mechanical properties.
The invention has the beneficial effects that: based on an accurate CT detection technology, the method rapidly and accurately detects the distribution of the gas content and the advance stress of the coal seam in front of the working face by scanning the gas content and the advance stress of the coal face by a transmitting source and receiving and processing by a detector and combining the quantitative change relationship of the CT value and the advance stress and the gas content; the method is simple, strong in operability, high in measurement speed, good in effect and wide in practicability in the field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic layout diagram of devices in a coal face gas content and lead stress rapid determination method in an embodiment of the invention;
fig. 2 is a schematic diagram of a method for determining and calculating the length of a detected borehole and a drilling angle in the embodiment of the present invention.
Description of reference numerals:
1-digital-to-analog converter, 2-display, 3-power supply, 4-emission source, 5-exploration drilling field, 6-exploration drilling hole and 7-detector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a method for rapidly determining the gas content and the lead stress of a coal face comprises the following steps:
a. firstly, arranging an emission source 4 on the coal wall of a working face, wherein the emission source 4 is electrically connected with a power supply 3;
b. constructing a detection drill site 5 into a coal seam in a working face return air roadway, constructing a plurality of detection drill holes 6 in the detection drill site 5 in front of the working face according to a certain angle and a certain distance after calculation and measurement according to the position of an emission source 4, and ensuring that all the detection drill holes 6 and the emission source 4 are positioned in the same plane;
c. the detector 7 is respectively placed in the detection drill holes 6, the detectors 7 are respectively and electrically connected to one digital-to-analog converter 1, the digital-to-analog converter 1 is electrically connected to the display 2, and the detector 7, the digital-to-analog converter 1 and the display 2 are respectively and electrically connected to the power supply 3;
d. starting an emission source 4 and a detector 7, emitting X-rays or vibration waves to a coal seam by using the emission source 4, receiving an emission source signal by using the detector 7, and detecting the coal seam gas content and the advance stress within the range of 20-30 m in front of a working face;
e. the detector 7 calculates the digital-to-analog conversion of the received wave source through the digital-to-analog converter 1, and displays the gas content and the corresponding CT value of the lead stress within the range of 20-30 m in front of the working surface through the display 2;
f. and further obtaining the distribution of the coal seam gas content and the advanced stress within the range of 20-30 m in front of the coal face according to the quantitative change relationship between different gas contents and different stresses tested in the laboratory and the CT value.
g: determining abnormal areas of the gas content and the advanced stress according to the measured gas content and the advanced stress distribution, and then eliminating the danger of the abnormal areas through measures of drilling hole pre-pumping, pressure relief and permeability increase;
h: and (e) repeating the steps a to g when the working face is mined to 5m before the cutoff of the measuring range, and continuously measuring the gas content and the advance stress of the working face until the mining of the working face is finished.
In step b, the number of the detection drill holes 6 and the number of the detectors 7 are 5.
In step b, the drilling angle is set as a, and referring to fig. 2, the calculation method is as follows: firstly, determining the position of an emission source, setting the distance from the emission source to an air return roadway as L1, secondly, constructing a detection drill site in the air return roadway, setting the distance from the emission source to a working surface as L2, setting the required distance from a detector 7 to the emission source as L3, and calculating the drilling angle a of a detection drill hole 6 according to the following formula:
the calculation formula of the length L of the probe borehole 6 in step b is:
the distance L3 between the detector 7 and the emission source 4 is determined comprehensively according to the parameters of the air permeability of the coal seam, the magnitude of the ground stress and the mechanical properties.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. A coal face gas content and advance stress rapid determination method is characterized by comprising the following steps:
a. firstly, arranging an emission source (4) on the coal wall of a working surface, wherein the emission source (4) is electrically connected with a power supply (3);
b. constructing a detection drill site (5) into a coal seam in a working face air return roadway, and constructing a plurality of detection drill holes (6) in the detection drill site (5) according to a certain angle and a certain length in front of the working face after calculation and measurement according to the position of an emission source (4), so as to ensure that all the detection drill holes (6) and the emission source (4) are positioned in the same plane;
c. detectors (7) are respectively placed in the detection drill holes (6), the detectors (7) are respectively and electrically connected to a digital-to-analog converter (1), the digital-to-analog converter (1) is electrically connected to a display (2), and the detectors (7), the digital-to-analog converter (1) and the display (2) are respectively and electrically connected to a power supply (3);
d. starting an emission source (4) and a detector (7), emitting X-rays or vibration waves to a coal seam by using the emission source (4), receiving an emission source signal by using the detector (7), and detecting the coal seam gas content and the advance stress within a range of 20-30 m in front of a working face;
e. after the detector (7) calculates the digital-to-analog conversion of the received wave source through the digital-to-analog converter (1), the display (2) displays the gas content and the corresponding CT value of the lead stress within the range of 20-30 m in front of the working surface;
f. further obtaining the distribution of the coal seam gas content and the advanced stress within the range of 20-30 m in front of the coal face according to the quantitative change relation between different gas contents and different stresses tested in a laboratory and the CT value;
g: determining abnormal areas of the gas content and the advanced stress according to the measured gas content and the advanced stress distribution, and then eliminating the danger of the abnormal areas through measures of drilling hole pre-pumping, pressure relief and permeability increase;
h: and (e) repeating the steps a to g when the working face is mined to 5m before the cutoff of the measuring range, and continuously measuring the gas content and the advance stress of the working face until the mining of the working face is finished.
2. A method for rapidly determining the gas content and the lead stress of a coal face as claimed in claim 1, characterized in that the number of the detection drill holes (6) and the detectors (7) in the step b is 5.
3. The method for rapidly determining the gas content and the lead stress of the coal face according to claim 1, wherein the drilling angle in the step b is set as a, and the calculation method comprises the following steps: firstly, determining the position of an emission source, setting the distance between the emission source and a return air roadway to be L1, secondly, constructing a detection drilling site in the return air roadway, setting the distance between the detection drilling site and a working face to be L2, setting the required distance between a detector (7) and the emission source to be L3, and calculating the drilling angle a of a detection drilling hole (6) according to the formula:
4. a method for rapid determination of the gas content and the lead stress of a coal face as claimed in claim 3, characterized in that the length L of the probe borehole (6) in step b is calculated by the formula:
5. a method for rapidly determining the gas content and the lead stress of a coal face as claimed in claim 3, characterized in that the distance L3 between the detector (7) and the emission source (4) is determined comprehensively according to the parameters of the gas permeability, the magnitude of the ground stress and the mechanical properties of the coal seam.
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| CN114961696A (en) * | 2022-05-31 | 2022-08-30 | 西安科技大学 | Method for detecting gas parameters in directional long drill hole of coal seam |
| CN115628100B (en) * | 2022-10-28 | 2024-01-23 | 铁福来装备制造集团股份有限公司 | Coal seam punching and hole making method |
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| FR2313092A1 (en) * | 1975-04-04 | 1976-12-31 | Schwetzoff Vladimir | Mine atmosphere sampler for inflammable gases - has automatic spark produced in enclosed space with explosion triggering alarm |
| CN101718212B (en) * | 2009-10-09 | 2013-05-22 | 西安西科测控设备有限责任公司 | Device for tracking and early warning outburst danger of mine coal and gas in real time |
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