CN114137106A - Device and method for detecting deep hole presplitting blasting effect - Google Patents
Device and method for detecting deep hole presplitting blasting effect Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
- G01N2030/065—Preparation using different phases to separate parts of sample
Abstract
The invention discloses a device and a method for detecting a deep hole pre-splitting blasting effect, which are used for detecting the deep hole pre-splitting blasting effect of a coal seam or a rock stratum under a coal mine. The detection device is composed of trace gas SF6The injection device and the gas collection device. The gas injection device comprises SF6The gas bottle, the flowmeter, the pressure gauge, the gas transmission pipeline and the sealing ring; the gas sample collecting device mainly comprises a collecting bag and a HNPQY-110 type gas sampling device; by using the detection device, SF is injected into the blast hole which is subjected to blasting6Tracing gas, collecting gas samples in other blast holes (blasted blast holes or non-blasted blast holes) in the working area, and performing infrared spectrum field analysis on the collected gas samples and gasThe experimental analysis of the phase chromatograph is combined to analyze whether the collected gas contains SF6The method is used for evaluating the hole crack through effect of the presplitting blasting area and optimizing blasting parameters. The invention has the characteristics of wide application range, high reliability of measurement results, simple and quick operation and the like.
Description
Technical Field
The invention relates to a device and a method for detecting a deep hole presplitting blasting effect, and belongs to the technical field of mining.
Background
The current blasting technology is widely applied to mine engineering, urban construction engineering and water conservancy and hydropower engineering. In particular, in coal mining, a deep hole presplitting blasting method is generally adopted to weaken a hard top plate and cut the top to release pressure. In addition, in order to increase the coal body fracture and improve the coal body permeability, gas extraction is facilitated, and deep hole presplitting blasting is also widely applied.
In order to detect the effect of deep hole presplitting blasting, two methods are most commonly used: firstly, drilling a drill hole again near a blasted blast hole, observing the development condition of secondary cracks (blasting cracks) on the wall of the drill hole by using a hole peeping instrument, and further judging the blasting effect and the crack area range; and secondly, judging the blasting effect and the range of the fracture area by detecting whether the holes are infiltrated by a water injection detection method. Regarding the method one, one or more additional drill holes are drilled, so that the engineering quantity is large; on the other hand, the hole peeping instrument can only observe macroscopic cracks on the wall of the drilled hole, and whether the cracks are communicated due to blasting is judged only by personal subjective experience, so that the accuracy is poor. And for the second method, the method is generally suitable for bottom plate holes or inclined holes, and the engineering quantity is large. The detection effects of the two methods are not ideal.
Disclosure of Invention
In view of the above disadvantages, the present invention provides a device and method for detecting deep hole presplitting blasting effect, which uses the existing blast hole and uses SF6And the gas diffusion detects the connectivity between blast holes, so that the aim of detecting the presplitting blasting effect is fulfilled.
The principle of the invention is as follows: the purpose of deep hole presplitting blasting is to utilize blasting action to break a specified rock stratum so as to achieve the effect of breaking the whole rock stratum. If the blasting parameters are designed reasonably, rock formations between adjacent blast holes can be broken or fractures of the rock formations can be developed by blasting force after blasting. From this we can consider that: if the blasting effect is good and the rock stratum between the blast holes can generate a gas passage, then the marking gas is injected into one blast hole to detect whether the marking gas exists in the other blast hole or not, and the quality of the blasting effect can be represented.
The invention provides a device for detecting the pre-splitting blasting effect of a deep hole, which consists of a gas injection device and a detection gas acquisition device; the gas injection device comprises SF6The gas bottle, the flowmeter, the pressure gauge, the gas pipe and the sealing ring; the gas sample collecting device comprises a collecting bag, a collecting long pipe and a gas sampling device, wherein the collected gas sample passes through SF6And analyzing by a gas chromatography detection system.
Furthermore, a flowmeter and a pressure gauge in the gas injection device are arranged at the joint of the gas bottle and the gas pipe and used for monitoring the flow and the pressure of the injected gas and ensuring that the injected gas quantitatively enters the blast hole without escaping at the gas pipe.
Further, a sealing ring is used for plugging the gas injection blast hole, the sealing ring is installed at the lower section of the gas injection blast hole and is close to the surface of the roadway roof, and the gas injection blast hole space between the inner wall of the gas injection blast hole and the outer wall of the gas transmission pipeline is filled with gas with certain pressure in a certain section, so that the gas in the gas injection blast hole above the sealing ring and the gas below the sealing ring cannot be communicated with each other, and the sealing effect is achieved.
The gas sampling device is a gas sampling device special for a mine: a gas sampling device of the model HNPQY-110. The gas sampling device is connected with a long collecting pipe which is deep in a gas collecting blast hole to extract gas.
The invention provides a method for detecting a deep hole presplitting blasting effect by adopting the device, which comprises the following steps:
(1) according to the presplitting blasting implementation scheme (related parameters such as blast hole spacing and row spacing), carrying out field blast hole arrangement in a working area;
(2) the detection blast holes comprise gas injection blast holes and gas collection blast holes. After blasting all or part of the blast holes, selecting a gas injection blast hole, injecting gas from the blast hole by a gas injection device, selecting a plurality of other blast holes (blasted blast holes or not blasted blast holes) in a working area, wherein the other blast holes are called as gas collection blast holes, and collecting gas from the gas collection blast holes by a gas collection device; analyzing the collected gas to obtain SF gas6Gas indicates that a crack is communicated between the two blast holes, so that the blasting effect is good; otherwise, it indicates that the fracture is not through, the blasting effect is poor, and related parameters such as blast hole spacing, row spacing and explosive loading are required to be further reduced, so as to achieve the purpose of optimizing blasting parameters.
In the method, the gas injection blast hole is a blasted blast hole, and gas is injected by a gas injection device.
In the above method, the gas collection blast holes refer to other blast holes in the blasting working area except for the gas injection blast hole, and the gas collection blast holes may be either blasted blast holes or non-blasted blast holes. And the gas collecting blast hole is used for collecting gas in the blast hole by a gas collecting device. If the blast hole is detected to be exploded, the blast mud in the hole needs to be removed so as to be beneficial to gas injection or gas collection.
In the above method, the process of collecting the gas sample is as follows: utilize and gather the bag and gather gas, and gather the collection long tube among the gas sampling device that the bag is connected and stretch into and gather gaseous big gun hole, gather the long tube and stretch into to 1/3 depths apart from big gun hole bottom, gather gaseous collection device and gather its interior gas, gather so and can collect the SF in the whole gaseous big gun hole of gathering more easily all-roundly6A gas.
In the above method, the detection gasThe inert gas SF which is specified by the method and has no toxicity, no combustion and high stability6The tracer gas is detected and analyzed by infrared spectroscopy on site, and the experimental analysis and determination instrument is a gas chromatograph.
The basis for judging the good or bad effect in the method for detecting the deep hole presplitting blasting effect is as follows: if containing SF6Gas indicates that cracks among blasting holes selected by blasting are communicated; if no SF is contained6And gas indicates that the cracks among the blast holes selected by blasting are not communicated.
The principle of detecting the position of the blast hole is as follows: the gas injection blast hole is used as a center, a plurality of gas collection blast holes are arranged in a blasting influence area, and the positions of the gas collection blast holes are arranged in a diagonal or central diffusion type measuring mode relative to the gas injection blast hole.
The invention has the beneficial effects that:
(1) compared with the prior art, the invention utilizes the existing blasting blast hole and uses SF6The tracer gas injection and gas collection device is used for testing the blasting effect, and the device is simple and convenient to operate;
(2) using SF6The tracer gas is used for detecting the blasting effect, so that the reliability, the economy and the stability are high;
(3) using SF6During inspection, the range of selected measuring points is large, the number of blast holes is large, the data can be referred to more contrastively, the working efficiency is improved, and the cost is reduced;
(4) the method can be used for detecting the connectivity degree of the blasted or non-blasted blast holes, can achieve systematic detection on the blasting effect, and has the advantages of simple operation and high result reliability.
Drawings
FIG. 1 is a schematic plan view of an inspection operation according to the present invention;
FIG. 2 is a plan view of arrangement of blast holes in a common roadway roof according to the present invention;
FIG. 3 is a cross-sectional view of a blasthole arrangement I-I according to the present invention;
FIG. 4 is a cross-sectional view of a shot hole arrangement II-II according to the present invention;
FIG. 5 is a simulation of the diagonal arrangement of test blastholes in accordance with the present invention;
FIG. 6 is a simulation of the detection of holes in a center-diffused arrangement in accordance with the present invention;
FIG. 7 is a diagram of a blast hole arrangement of the mine according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view taken along line A-A of FIG. 7;
fig. 9 is a cross-sectional view taken along line B-B of fig. 7.
In the figure, 1 is a gas bottle, 2 is a flowmeter, 3 is a pressure gauge, 4 is a gas transmission pipeline, 5 is a sealing ring, 6 is a collection bag, 7 is a gas injection blast hole, 8 is a collection gas blast hole, 9 is a tunnel, 10 is a collection long pipe, 11 is a gas injection device, and 12 is a detection gas collection device.
Detailed Description
Fig. 2, 3 and 4 are arrangement diagrams of blast holes implemented on a top plate of a common underground roadway, and the invention is further explained by combining the drawing 1.
As shown in fig. 1, a device for detecting the pre-splitting blasting effect of a deep hole comprises a gas injection device and a gas detection collection device; the gas injection means 11 comprises SF6The gas bottle comprises a gas bottle 1, a flowmeter 2, a pressure gauge 3, a gas pipeline 4 and a sealing ring 5; the gas detection and collection device 12 comprises a collection bag 6, a collection long tube 10 and a gas sampling device, wherein the collected gas sample passes through SF6And analyzing by a gas chromatography detection system.
Furthermore, a flowmeter 2 and a pressure gauge 3 in the gas injection device are both arranged at the joint of the gas bottle mouth and the gas transmission pipeline 4 and used for monitoring the amount and pressure of injected gas and ensuring that the specified injected gas completely enters the blast hole and does not escape from the gas transmission pipeline 4.
Further, a sealing ring 5 is adopted to block the space between the outer wall of the gas transmission pipeline 4 and the inner wall of the gas injection blast hole 7, so that the injected gas is prevented from leaking.
The gas sampling device is a gas sampling device special for a mine: a gas sampling device of the model HNPQY-110.
The invention provides a method for detecting a deep hole presplitting blasting effect by adopting the device, which comprises the following steps:
firstly, the working personnel arrange the blast holes on site in the working area according to the presplitting blasting implementation scheme (related parameters such as blast hole spacing and row spacing).
As shown in FIG. 1, SF6The gas bottle 1, the flowmeter 2 and the pressure gauge 3 are positioned in a roadway, one end of the gas pipeline 4 is positioned in the SF6The mouth of the gas bottle 1 and the other end are in a gas injection blast hole. Generally speaking, the gas injection blast hole is drilled upwards on the top plate, and the sealing ring 5 is arranged in the gas injection blast hole, fills the gap between the gas injection blast hole and the gas transmission pipeline with certain pressure in a certain section and plays a role in sealing. The entire structure of the gas injection device can be considered to be located below the gas injection blasthole.
Secondly, after the blast holes are completely or partially blasted, one blasted blast hole is selected and called as a gas injection blast hole 7, and gas is injected into the blasted blast hole
The gas is injected into the blast hole by the inlet device 11, a plurality of other blast holes (blasted blast holes or non-blasted blast holes) are selected in the working area, the latter is called as gas collecting blast holes 8, and gas collection is carried out from the gas collecting blast holes 8 by the detection gas collecting device 12. Analyzing the collected gas to obtain SF gas6Gas indicates that a crack is communicated between the two blast holes, so that the blasting effect is good; otherwise, it indicates that the fracture is not through, the blasting effect is poor, and related parameters such as blast hole spacing, row spacing and explosive loading are required to be further reduced, so as to achieve the purpose of optimizing blasting parameters.
Thirdly, determining and detecting a blast hole: comprises a gas injection blast hole 7 and a gas collection blast hole 8. Wherein the gas injection blast hole 7 is a blasted blast hole, and gas is injected by a gas injection device 11. The gas collecting blast hole 8 is used for collecting gas in the gas collecting blast hole by a detection gas collecting device 12. If the blast hole is blasted, the blast mud in the hole needs to be removed so as to be beneficial to gas injection or gas collection.
In the above method, the gas injection blasthole 7 refers to a blasted blasthole, the gas collection blasthole 8 refers to other blastholes in the blasting working area except for the gas injection blasthole, and the gas collection blasthole 8 may be either a blasted blasthole or an unfired blasthole.
In the above method, the process of collecting the gas sample is as follows: collecting gas with collecting bag 6The body, and gather collection long tube 10 among the detection gas collection device 12 that bag 6 connects and stretch into gathering gaseous big gun hole 8, gather long tube 10 and stretch into to 1/3 big gun hole degree of depth apart from the hole bottom, gather by detecting gas collection device 12 gas in it, gather so can collect the SF in whole collection gaseous big gun hole 8 all-round more easily6A gas.
In the method, the detection gas is an inert gas SF which is specified by the method, is non-toxic, non-combustible and high in stability6The tracer gas is detected and analyzed by infrared spectroscopy on site, and the experimental analysis and determination instrument is a gas chromatograph.
The gas detection judging method comprises the steps of injecting a gas injection blast hole 7, detecting gas components in a gas collection blast hole 8 in a selected area, wherein the gas collection blast hole 8 comprises a blasted blast hole or an unexploded blast hole; if containing SF6Gas indicates that cracks among blasting holes selected by blasting are communicated; if no SF is contained6And gas indicates that the cracks among the blast holes selected by blasting are not communicated.
The principle of detecting the position of the blast hole is as follows: a plurality of gas collection blast holes 8 are formed in the blasting affected area of the gas injection blast hole 7 as the center, and the positions of the gas collection blast holes 8 are arranged in a diagonal or center diffusion type measurement manner with respect to the gas injection blast hole 7, as shown in fig. 5 and 6.
The invention is further described in this section with reference to an embodiment and figure 7.
A No. 15 coal seam is mined from a certain mine, the thickness of the coal seam is 4.0m, and the coal seam is a nearly horizontal coal seam. The direct roof is mudstone (f = 2.0), with a thickness of 1 m; the basic top is K2 limestone, which is dense and hard (f = 8.0) and has an average thickness of 6.0 m. The working face adopts a long wall one-time mining full-height fully-mechanized mining method and a full caving method to manage the top plate. The top plate can not be collapsed in time during initial mining, the suspended top area of the upper corner is large, and therefore deep hole presplitting blasting is adopted to weaken the top plate, the suspended top of the end of the upper corner is processed, and the blasting effect needs to be detected. As shown in fig. 7, explanation about the arrangement of the blast hole positions of the present embodiment: in the embodiment, blast holes are arranged in the return air crossheading, all blast holes are 0.5m away from the coal pillar side and are arranged perpendicular to the top plate of the roadway, the hole depth is 7.0m, and the hole spacing is 1.0 m.
The implementation steps are as follows:
(1) deep hole presplitting blasting initial scheme design
And a row of blast holes are arranged in parallel in the return air gateway along the advancing direction of the working face from the outer side of the hole cutting, and the continuous deep hole presplitting blasting range is 33 m. A total of 33 blast holes (blast hole numbers 1, 2, 3, … … 32, 33) were formed, the diameter of each blast hole was 42mm, and the depth of each blast hole was 7 m. The distance between blast holes is 1.0m, the distance between blast holes and the outer wall of the gate way is 0.5m, and the blast holes are vertical to the top plate. The explosive used for presplitting blasting is three-level coal mine permitted emulsion explosive, and the specification of the explosive roll is phi 35 multiplied by 200mm and 200 g/roll. The charge length of each hole is 5m, the sealing mud length is 2m, and 8# common instantaneous double detonators are detonated. The arrangement of the blastholes is shown in figure 7.
The initiation sequence is as follows: and arranging blast holes and blasting before stoping of the working face. 1, 2, 3, … … 32, 33 in sequence from the hole cutting, and is detonated by times by adopting grouped charging, wherein the number of blast holes is not more than 4 at most by each detonation. In order to ensure the stability of the tunnel in the deep hole pre-splitting blasting process, a single column and a pi-shaped beam are adopted for temporary reinforcing support before pre-splitting blasting.
(2) Blast hole blasting implementation
Before the working face is arranged and the stoping is finished, 4 blast holes are sequentially arranged from the hole cutting, the numbers of the blast holes are respectively 1, 2, 3 and 4, and the No. 1, 2, 3 and 4 holes are subjected to charging presplitting blasting.
(3) Blasting effect detection and evaluation
Removing stemming in the hole, selecting No. 2 blast hole as gas injection blast hole, and injecting SF by gas injection device6And gas is respectively collected for the No. 1 blast hole and the No. 3 blast hole by a gas collecting device. Analyzing collected gas that No. 1 and No. 3 blast holes do not contain SF6And gas indicates that the cracks are not communicated, the blasting effect is poor, the designed distance of the initially designed blast holes is too large, and the pre-cracking effect of the top plate is not achieved.
(4) Blast hole parameter optimization
According to the detection result, the distance between the reduced blast holes 5, 6, 7 and 8 is 0.7 m. And after the blasting is finished, selecting a No. 7 blast hole as a gas injection blast hole, and respectively carrying out gas collection on a No. 6 blast hole and a No. 8 blast hole. By analyzing the collected gas for No. 6 and No. 8 blast holesDetection of SF6And gas shows that the two blast holes are communicated by cracks, so that the blasting effect is good. Therefore, the distance between blast holes is reduced to 0.7m from 1.0m of the initial design, and the aim of optimizing blasting parameters is further fulfilled.
Claims (8)
1. The utility model provides a detect device of deep hole presplitting blasting effect which characterized in that: the device consists of a gas injection device and a detection gas collection device; the gas injection device comprises SF6The gas bottle, the flowmeter, the pressure gauge, the gas transmission pipeline and the sealing ring; the gas sample collecting device comprises a collecting bag, a collecting long pipe and a gas sampling device, wherein the collected gas sample passes through SF6Analyzing by a gas chromatography detection system; the flowmeter and the pressure gauge in the gas injection device are both arranged in the SF6The interface of the gas bottle and the gas transmission pipeline is used for monitoring the flow and the pressure of the injected gas and ensuring that the specified injected gas completely enters the gas injection blast hole.
2. The device for detecting the effect of deep hole presplitting blasting according to claim 1, characterized in that: a sealing ring is used for sealing the space between the outer wall of the gas pipeline and the inner wall of the gas injection blast hole, and the sealing ring is arranged at the lower section of the gas injection blast hole and is close to the top plate surface of the roadway; preventing leakage of the injected gas.
3. The device for detecting the effect of deep hole presplitting blasting according to claim 1, characterized in that: the gas sampling device is a HNPQY-110 type gas sampling device.
4. A method for detecting the effect of deep-hole presplitting blasting, which adopts the device for detecting the effect of deep-hole presplitting blasting according to any one of claims 1 to 3, and is characterized by comprising the following steps:
(1) the working personnel arrange the blast holes on site in the working area according to the presplitting blasting implementation scheme;
(2) the detection blast holes comprise gas injection blast holes and gas collection blast holes; after the blast holes are completely or partially blasted, selecting a gas injection blast hole, and injecting gas into the blast hole by a gas injection deviceInjecting gas into the holes, selecting a plurality of gas collecting blast holes in the working area, and collecting the gas from the gas collecting blast holes by a gas collecting device; analyzing the collected gas to obtain SF gas6Gas indicates that a crack is communicated between the two blast holes, so that the blasting effect is good; otherwise, the cracks are not communicated, the blasting effect is poor, the blast hole spacing and the row spacing are required to be further reduced, and the explosive loading is required to be increased, so that the aim of optimizing blasting parameters is fulfilled.
5. The method for detecting the effect of deep hole presplitting blasting according to claim 4, which is characterized in that: the gas injection blast hole is a blasted blast hole, and gas is injected by a gas injection device; the gas collecting blast holes are blasted blast holes or non-blasted blast holes, and gas in the gas collecting blast holes is collected by a gas collecting device; if the blast hole is detected to be exploded, the blast mud in the hole needs to be removed so as to be beneficial to gas injection or gas collection.
6. The method for detecting the effect of deep hole presplitting blasting according to claim 4, which is characterized in that: the process of collecting the gas sample comprises the following steps: utilize and gather the bag and gather gas, and gather the collection long tube among the gas sampling device that the bag is connected and stretch into and gather gaseous big gun hole, gather the long tube and stretch into to 1/3 depths apart from big gun hole bottom, gather gas collection device to it in it, so gather the SF that can collect in the whole gaseous big gun hole of gathering all-roundly6A gas.
7. The method for detecting the effect of deep hole presplitting blasting according to claim 4, which is characterized in that: the basis for judging the good or bad effect in the method for detecting the deep hole presplitting blasting effect is as follows: if containing SF6Gas indicates that cracks among blasting holes selected by blasting are communicated; if no SF is contained6And gas indicates that the cracks among the blast holes selected by blasting are not communicated.
8. The method for detecting the effect of deep hole presplitting blasting according to claim 4, which is characterized in that: the principle of detecting the determined position of the blast hole is as follows: the gas injection blast hole is used as a center, a plurality of gas collection blast holes are arranged in a blasting influence area, and the positions of the gas collection blast holes are arranged in a diagonal manner or a central diffusion manner relative to the gas injection blast hole.
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| CN103321669A (en) * | 2013-07-08 | 2013-09-25 | 中国矿业大学(北京) | Method for increasing permeability of low-permeability coal seam by means of deep-hole directional pre-splitting blasting |
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| CN207538828U (en) * | 2017-10-09 | 2018-06-26 | 阳泉煤业（集团）股份有限公司 | A kind of device that explosion coverage in coal seam is measured using search gas |
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2021
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Patent Citations (3)
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|---|---|---|---|---|
| CN103321669A (en) * | 2013-07-08 | 2013-09-25 | 中国矿业大学(北京) | Method for increasing permeability of low-permeability coal seam by means of deep-hole directional pre-splitting blasting |
| CN107676077A (en) * | 2017-10-09 | 2018-02-09 | 阳泉煤业（集团）股份有限公司 | A kind of device and method that explosion coverage in coal seam is determined using search gas |
| CN207538828U (en) * | 2017-10-09 | 2018-06-26 | 阳泉煤业（集团）股份有限公司 | A kind of device that explosion coverage in coal seam is measured using search gas |
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