CN105301202A - Test system and test method for determining upper protective layer mining pressure releasing scope - Google Patents
Test system and test method for determining upper protective layer mining pressure releasing scope Download PDFInfo
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- CN105301202A CN105301202A CN201510822815.2A CN201510822815A CN105301202A CN 105301202 A CN105301202 A CN 105301202A CN 201510822815 A CN201510822815 A CN 201510822815A CN 105301202 A CN105301202 A CN 105301202A
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Abstract
The invention discloses a test system and test method for determining an upper protective layer mining pressure releasing scope. The test system includes a spot test part and a laboratory test part; the laboratory test part includes a large-sized radial seepage test mechanism; the large-sized radial seepage test mechanism is connected with an electro-hydraulic servo control oil pressure pump; the electro-hydraulic servo control oil pressure pump is used for applying a pressure on the large-sized radial seepage test mechanism; the large-sized radial seepage test mechanism is provided with a mass flowmeter; the mass flowmeter is communicated with the large-sized radial seepage test mechanism and a gas collecting device through corresponding pipelines respectively; the large-sized radial seepage test mechanism is communicated with a vacuum pump through a corresponding pipeline; the vacuum pump is communicated with a methane steel cylinder through a pressure reducing valve. The protective scope is inspected under an upper protection layer mining condition of performing elimination outburst with group press unloading as the priority, a scientific basis is provided for protected coal seam mining reasonable layout and safety mining, and the test accuracy is improved.
Description
Technical field
The present invention relates to mine gas diaster prevention and control field, particularly relating to a kind of for determining that up-protective layer exploits test macro and the method for testing of relief range.
Background technology
Along with the seam mining degree of depth increases, coal-bed gas pressure and content increase gradually, and coal-bed gas outburst hazard increases gradually.For projecting coal bed, the principle that China's outburst prevention work adheres to that region outburst prevention measures is leading, local prevent outburst measure supplements, and to exploit protective seam be effective, the most most economical regional outburst prevention measures of control coal and gas prominent.The know-why of protective coat extracted is: select non-protruding coal seam or weakly projecting coal bedly first to exploit as protective seam; make upper and lower coal and rock produce strong tension to destroy; and be moved; protected coal seam primitively stress is discharged; cracks in coal seam is fully expanded; gas permeability of coal seam significantly improves; a large amount of ADSORPTION STATE desorption of mash gas is free state; by gas pressure relief enhanced gas extraction; protected coal seam terrestrial stress, gas pressure and content are reduced further, finally reaches the object eliminating protected coal seam outburst hazard.
Protected effect and the protection domain of investigating protected coal seam is needed after protective coat extracted, according to State Administration of Quality and Technical Supervision's regulations " control coal and gas prominent regulation " and national security production industry standard " protective coat extracted technical manual AQ1050-2008 " known, determine that protection domain is mainly through arranging gas pressure testing bore holes at protected seam release borderline region at present, protective seam scope is determined by the contrast of gas pressure original before and after protective coat extracted and remaining gas pressure, then protection domain is investigated further by the gas bearing capacity of actual measurement gas pressure measuring and calculating, the method is to calculate Gas explosion burns, the release effect of protective coat extracted is not fully demonstrated, and to unload terrestrial stress for the main up-protective layer mining conditions carrying out region extinction, carry out protection domain investigation by stress index and have more science, at present, in protective coat extracted process, field engineering technician evaluates the exploitation effect of protective seam by test protected coal seam dilatational strain figureofmerit, but test success ratio is lower.
Therefore; carry out being badly in need of a kind of technical method being determined protection domain by test stress index when projecting coal bed protection domain is investigated; be particularly useful for the technical method determining up-protective layer exploitation protection domain; can be protected coal seam digging roadway layout and outstanding control provides scientific basis by investigating stress index, and then ensure projecting coal bed safety and high efficiency.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art; the object of the present invention is to provide a kind of for determining that up-protective layer exploits test macro and the method for testing of relief range; to to unload terrestrial stress for the main test carrying out protection domain under the up-protective layer mining conditions of extinction, to improve test accuracy.
For solving the problems of the technologies described above, the present invention program comprises:
A kind of test macro for determining up-protective layer exploitation relief range, it comprises on-the-spot test portion and laboratory test department, the coal sample obtained in on-the-spot test portion by experiment room test department is tested, wherein, laboratory test department comprises large scale Radial Flow Through Porous Media mechanism for testing, large scale Radial Flow Through Porous Media mechanism for testing is connected with an electro-hydraulic servo control oil pressure pump, electro-hydraulic servo control oil pressure pump is used for applying pressure to large scale Radial Flow Through Porous Media mechanism for testing, large scale Radial Flow Through Porous Media mechanism for testing is configured with a mass flowmeter, mass flowmeter by respective line respectively with large scale Radial Flow Through Porous Media mechanism for testing, gas extractor is connected, large scale Radial Flow Through Porous Media mechanism for testing is connected with vacuum pump by respective line, vacuum pump is connected with a methane steel cylinder by reduction valve.
Described test macro, wherein, above-mentioned large scale Radial Flow Through Porous Media mechanism for testing comprises a high pressure tank body, high pressure tank body top is provided with joint flange, joint flange is connected with high pressure tank body by coupling bolt nut, T-shaped piston is provided with in high pressure tank body, the vertical section of T-shaped piston is connected with electro-hydraulic servo control oil pressure pump, the horizontal segment of T-shaped piston is transversely arranged in high pressure tank body, pressure head is provided with in high pressure tank body below the horizontal segment of T-shaped piston, the permeation floral tube for placing coal sample is provided with below pressure head, permeation floral tube is connected by exhaust floral tube, the bottom of permeation floral tube is provided with gas outlet, gas outlet is connected with mass flowmeter by exhausr port, one end of a permeation floral tube is connected with vacuum pump by gas port, one end of another permeation floral tube and the other end of gas outlet are respectively arranged with pressure unit, mass flowmeter, pressure unit is all connected with a data acquisition unit, data acquisition unit is connected with a data processing centre (DPC).
Described test macro, wherein, above-mentioned on-the-spot test portion comprises up-protective layer, up-protective layer comprises goaf, the one end in goaf is provided with up-protective layer machine lane, the other end is provided with up-protective layer air way, the below of up-protective layer is protected seam, coal borer hole is worn as pressure measuring drill hole to release borderline region four small-bores of constructing in the floor roadway and drill site of protected seam, pressure measuring drill hole borehole bottom location draws a straight line, and unload centered by line ball center line by theory, a pressure measuring drill hole is arranged at interval of 15 meters, pressure measuring drill hole is evenly arranged, each pressure measuring drill hole is all connected with a tensimeter, pressure measuring drill hole adopts wind power slag-discharging construction technology, gather the coal sample of each pressure measuring drill hole in work progress and seal preservation, and record pressure measuring drill hole construction parameter, after pressure measuring drill hole construction, sealing of hole measures coal-bed gas pressure, records the reading of each pressure measuring drill hole corresponding pressure table every day.
A kind of method of testing, it comprises the following steps:
A, screening coal sample is positioned in permeation floral tube, then starts electro-hydraulic servo control oil pressure pump, drive T-shaped piston to move downward, apply vertical stress by pressure head to coal sample, carry out vacuum outgas subsequently, after two hours, close vacuum pump and corresponding valve; Then methane steel cylinder and reduction valve is opened, gas injection in high pressure tank body, gas injection pressure is this coal sample observed pressure value, carry out six h for equilibration absorption, then open corresponding valve and carry out the radial stable percolation experiment of large scale, inner and outer boundary pressure and gas flow when being balanced by pressure unit, mass flowmeter and data acquisition unit record;
B, data that steps A is surveyed substituted into formula (1) calculate, draw the permeability value of this coal sample under setting Vertical dimension power,
Wherein, K is the permeability of coal sample, and unit is mD or 10
-3μm; μ is the viscosity of gas, is taken as 1.087 × 10 when 20 DEG C
-5pas; p
0for the atmospheric pressure in laboratory, unit is Pa; Q
0for gas flow, unit is ml/s; p
wfor inner boundary pressure, unit is MPa; p
eouter boundary pressure, unit is MPa; r
wfor inner boundary radius, unit is cm, r
efor outer boundary radius, unit is cm; H is thickness of coal seam, and unit is cm;
C, carry out repeatedly the radial stable percolation experiment of large scale by changing coal sample and changing vertical stress, obtain the permeability of each coal sample under different vertical stress, and draw out the relation curve of infiltration and vertical stress;
D, survey coal seam permeability according to on-the-spot; determine each pressure measuring drill hole position coal body vertical stress; draw release borderline region vertical stress distribution curve; vertical release critical value is calculated according to actual ocurrence of coal seam situation; draw the position that this critical value is corresponding in measured curve, be the actual release boundary position of this region up-protective layer exploitation.
Described method of testing, wherein, also comprised before steps A:
Coal borer hole is worn as pressure measuring drill hole to release borderline region four small-bores of constructing in the floor roadway and drill site of protected seam, pressure measuring drill hole borehole bottom location draws a straight line, and unload centered by line ball center line by theory, a pressure measuring drill hole is arranged at interval of 15 meters, pressure measuring drill hole is evenly arranged, and each pressure measuring drill hole is all connected with a tensimeter; Pressure measuring drill hole adopts wind power slag-discharging construction technology, gather the coal sample of each pressure measuring drill hole in work progress and seal preservation, and record pressure measuring drill hole construction parameter, after pressure measuring drill hole construction, sealing of hole measures coal-bed gas pressure, record each pressure measuring drill hole manometric reading every day
After pressure stabilisation, record each pressure measuring drill hole gas pressure value, adopt pressure measuring drill hole radial return algorithm to calculate each pressure measuring drill hole position Permeability Coefficent in Coal Seam, and be converted into permeability according to formula (2), obtain the coal seam permeability of each boring position;
λ=K/ (2 μ p
0) formula (2)
Wherein, K is the permeability of coal sample, and unit is mD or 10
-3μm; μ is the viscosity of gas, is taken as 1.087 × 10 when 20 DEG C
-5pas; p
0for the atmospheric pressure in laboratory, unit is Pa.
Provided by the invention a kind of for determining that up-protective layer exploits test macro and the method for testing of relief range, the index that adopts when projecting coal bed protective coat extracted scope is investigated and the single technical matters of means of testing can be solved, to to unload terrestrial stress for the main investigation carrying out protection domain under the up-protective layer mining conditions of extinction, provide a kind of new way of carrying out investigating with stress index, investigation means are enriched, improve the accuracy of investigation, for protected coal seam digging rational deployment and safe working provide scientific basis, improve test accuracy, effectively can avoid the waste of coal resources and gas preventing and control engineering simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram in on-the-spot test portion in the present invention;
Fig. 2 is the schematic diagram of laboratory test department in the present invention;
Fig. 3 is the structural representation of large scale Radial Flow Through Porous Media mechanism for testing in the present invention;
Wherein, 1-up-protective layer machine lane, 2-goaf, 3-up-protective layer air way, 4-up-protective layer, 5-theory unloads line ball, Chuan Mei hole, 6-small-bore, 7-protected seam, 8-theory unloads line ball center line, 9-pressure measuring drill hole, 10-floor roadway and drill site, 11-tensimeter, 12-electro-hydraulic servo control oil pressure pump, 13-large scale Radial Flow Through Porous Media mechanism for testing, 14-mass flowmeter, 15-valve d, 16-gas extractor, 17-data processing centre (DPC), 18-data acquisition unit, 19-pressure unit, 20-vacuum pump, 21-reduction valve, 22-methane steel cylinder, 23-coupling bolt nut, 24-joint flange, 25-T type piston, 26-O-ring seal, 27-high pressure tank body, 28-pressure head, 29-is vented floral tube, 30-permeation floral tube, 31-gas port, 32-exhausr port.
Embodiment
The invention provides a kind of for determining that up-protective layer exploits test macro and the method for testing of relief range, for making object of the present invention, technical scheme and effect clearly, clearly, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of test macro for determining up-protective layer exploitation relief range, as shown in Figures 1 and 2, it comprises on-the-spot test portion and laboratory test department, the coal sample obtained in on-the-spot test portion by experiment room test department is tested, wherein, laboratory test department comprises large scale Radial Flow Through Porous Media mechanism for testing 13, large scale Radial Flow Through Porous Media mechanism for testing 13 is connected with an electro-hydraulic servo control oil pressure pump 12, electro-hydraulic servo control oil pressure pump 12 is for applying pressure to large scale Radial Flow Through Porous Media mechanism for testing 13, large scale Radial Flow Through Porous Media mechanism for testing 13 is configured with a mass flowmeter 14, mass flowmeter 14 by respective line respectively with large scale Radial Flow Through Porous Media mechanism for testing 13, gas extractor 16 is connected, large scale Radial Flow Through Porous Media mechanism for testing 13 is connected with vacuum pump 20 by respective line, vacuum pump 20 is connected with a methane steel cylinder 22 by reduction valve 21.
Further, as shown in Figure 3, above-mentioned large scale Radial Flow Through Porous Media mechanism for testing 13 comprises a high pressure tank body 27, high pressure tank body 27 top is provided with joint flange 24, joint flange 24 is connected with high pressure tank body 27 by coupling bolt nut 23, T-shaped piston 25 is provided with in high pressure tank body 27, the vertical section of T-shaped piston 25 is connected with electro-hydraulic servo control oil pressure pump 12, the horizontal segment of T-shaped piston 25 is transversely arranged in high pressure tank body 27, pressure head 28 is provided with in high pressure tank body 27 below the horizontal segment of T-shaped piston 25, the permeation floral tube 30 for placing coal sample is provided with below pressure head 28, permeation floral tube 30 is connected by exhaust floral tube 29, the bottom of permeation floral tube 30 is provided with gas outlet, gas outlet is connected with mass flowmeter 14 by exhausr port 32, one end of a permeation floral tube 30 is connected with vacuum pump 20 by gas port 31, one end of another permeation floral tube 30 and the other end of gas outlet are respectively arranged with pressure unit 19, mass flowmeter 14, pressure unit 19 is all connected with a data acquisition unit 18, data acquisition unit 18 is connected with a data processing centre (DPC) 17, data processing centre (DPC) 17 generally adopts the technology types such as computing machine.
In another preferred embodiment of the present invention, above-mentioned on-the-spot test portion comprises up-protective layer 4, up-protective layer 4 comprises goaf 2, the one end in goaf 2 is provided with up-protective layer machine lane 1, the other end is provided with up-protective layer air way 3, the below of up-protective layer 4 is protected seam 7, coal borer hole 6 is worn as pressure measuring drill hole 9 to release borderline region four small-bores of constructing from the floor roadway of protected seam 7 and drill site 10, pressure measuring drill hole 9 borehole bottom location draws a straight line, and unload centered by line ball center line 8 by theory, a pressure measuring drill hole 9 is arranged at interval of 15 meters, pressure measuring drill hole 9 is evenly arranged, each pressure measuring drill hole 9 is all connected with a tensimeter 11, pressure measuring drill hole 9 adopts wind power slag-discharging construction technology, gather the coal sample of each pressure measuring drill hole 9 in work progress and seal preservation, and the construction parameter of record pressure measuring drill hole 9, after pressure measuring drill hole 9 construction, sealing of hole measures coal-bed gas pressure, records the reading of each pressure measuring drill hole corresponding pressure table every day.
Present invention also offers a kind of method of testing using above-mentioned test macro, it comprises the following steps:
A, the screening coal sample obtained from pressure measuring drill hole 9 is positioned in permeation floral tube 30, then electro-hydraulic servo control oil pressure pump 12 is started, T-shaped piston 25 is driven to move downward, vertical stress is applied to coal sample by pressure head 28, carry out vacuum outgas subsequently, after two hours, close vacuum pump 20 and valve 15b, valve 15a; Then methane steel cylinder 22 and reduction valve 21 is opened, gas injection in high pressure tank body 27, gas injection pressure is this coal sample observed pressure value, carry out six h for equilibration absorption, then Open valve 15c, valve 15d carry out the radial stable percolation experiment of large scale, by pressure unit 19, mass flowmeter 14 and data acquisition unit 18 record balance time inner and outer boundary pressure and gas flow;
B, data that steps A is surveyed substituted into formula (1) calculate, draw the permeability value of this coal sample under setting Vertical dimension power,
Wherein, K is the permeability of coal sample, and unit is mD or 10
-3μm; μ is the viscosity of gas, is taken as 1.087 × 10 when 20 DEG C
-5pas; p
0for the atmospheric pressure in laboratory, unit is Pa; Q
0for gas flow, unit is ml/s; p
wfor inner boundary pressure, unit is MPa; p
eouter boundary pressure, unit is MPa; r
wfor inner boundary radius, unit is cm, r
efor outer boundary radius, unit is cm; H is thickness of coal seam, and unit is cm;
C, carry out repeatedly the radial stable percolation experiment of large scale by changing coal sample and changing vertical stress, obtain the permeability of each coal sample under different vertical stress, and draw out the relation curve of infiltration and vertical stress;
D, survey coal seam permeability according to on-the-spot; determine each pressure measuring drill hole 9 position coal body vertical stress; draw release borderline region vertical stress distribution curve; vertical release critical value is calculated according to actual ocurrence of coal seam situation; draw the position that this critical value is corresponding in measured curve, be the actual release boundary position of this region up-protective layer exploitation.
Further, as shown in Figure 1, also comprised before steps A:
Coal borer hole 6 is worn as pressure measuring drill hole 9 to release borderline region four small-bores of constructing from the floor roadway of protected seam 7 and drill site 10, pressure measuring drill hole 9 borehole bottom location draws a straight line, and unload centered by line ball center line 8 by theory, at interval of 15 meters of even pressure measuring drill holes 9, pressure measuring drill hole 9 is evenly arranged, and each pressure measuring drill hole 9 is all connected with a tensimeter 11; Pressure measuring drill hole 9 adopts wind power slag-discharging construction technology, gather the coal sample of each pressure measuring drill hole 9 in work progress and seal preservation, coal sample is herein used for steps A-step D and tests, and record pressure measuring drill hole 9 construction parameter, after pressure measuring drill hole 9 construction, sealing of hole measures coal-bed gas pressure, record each pressure measuring drill hole manometric reading every day
After pressure stabilisation, record each pressure measuring drill hole gas pressure value, adopt pressure measuring drill hole 9 radial return algorithm to calculate each pressure measuring drill hole 9 position Permeability Coefficent in Coal Seam, and be converted into permeability according to formula (2), obtain the coal seam permeability of each boring position;
λ=K/ (2 μ p
0) formula (2)
Wherein, K is the permeability of coal sample, and unit is mD or 10
-3μm; μ is the viscosity of gas, is taken as 1.087 × 10 when 20 DEG C
-5pas; p
0for the atmospheric pressure in laboratory, unit is Pa.
In order to further describe the present invention, below enumerating more detailed embodiment and being described.
Step a, according to protective coat extracted condition, determine that protected seam 7 theory unloads line ball center line 8 with reference to national security production industry standard " protective coat extracted technical manual AQ1050-2008 ", after up-protective layer 4 is exploited, coal borer hole 6 is worn as pressure measuring drill hole 9 to release borderline region 4 small-bores (Φ 46mm) of constructing in protected seam 7 floor roadway and drill site 10, i.e. 1#, 2#, 3# and 4#, pressure measuring drill hole 9 borehole bottom location connects being aligned, and unload centered by line ball center line 8 by theory, interval 15m is evenly arranged, pressure measuring drill hole 9 adopts wind power slag-discharging construction technology, gather the coal sample of each pressure measuring drill hole 9 in work progress and seal preservation, record pressure measuring drill hole 9 construction parameter simultaneously, after pressure measuring drill hole 9 construction, sealing of hole measures coal-bed gas pressure, record each boring pressure table 11 reading every day,
Step b, after pressure stabilisation, record each drilling gas force value, adopt pressure measuring drill hole 9 radial return algorithm to calculate each boring position Permeability Coefficent in Coal Seam, and according to formula λ=K/ (2 μ p
0) be converted into permeability, obtain the coal seam permeability of each boring position;
Step c, to 1#, 2#, the collection in worksite coal sample of 3# and 4# pressure measuring drill hole 9 is sieved, then the coal sample of one of them pressure measuring drill hole 9 is chosen, such as choosing 1# coal sample is evenly positioned in permeation floral tube 30 (internal diameter Φ 300mm), then pressure head 28 is installed, T-shaped piston 25 and joint flange 24, tighten attaching nut's bolt 23, start electro-hydraulic servo control oil pressure pump 12, T-shaped piston 25 moves downward, vertical stress is applied to coal sample by pressure head 28, after reaching setting value, turn-on data acquisition system and vacuum pump 20, vacuum outgas 2h is carried out to coal sample, then vacuum pump 20 and valve 15a is closed, open methane steel cylinder 22 and reduction valve 21, methane gas injects in high pressure tank body 27 by gas port 31, reduction valve 21 top hole pressure is adjusted to the actual measurement gas pressure value of the corresponding pressure measuring drill hole 9 of this coal sample, carry out six h for equilibration absorption, then Open valve 15c, valve 15d, carry out the radial stable percolation experiment of large scale coal sample, by pressure unit 19, mass flowmeter 14 records inner and outer boundary pressure and gas flow when balancing with data acquisition unit 18 and data processing centre (DPC) 17,
Steps d, above-mentioned the data obtained is substituted into formula (1)
By can be calculated the permeability value of this coal sample under setting Vertical dimension power;
Step e, change vertical stress, and repeat stable percolation experiment, this coal sample coal-bed gas permeability under different vertical stress can be drawn, equally the test of large scale Radial Flow Through Porous Media is carried out to other 3 coal samples, obtain the permeability of each coal sample under different vertical stress, the border seepage pressure of each experiment is each pressure measuring drill hole 9 field measurement gas pressure, experimentally result, draws out the relation curve of infiltration and vertical stress;
Step f, survey coal seam permeability value according to on-the-spot; determine each pressure measuring drill hole 9 position coal body vertical stress; draw release borderline region vertical stress distribution scatter diagram; and carry out matching; vertical release critical value is calculated according to actual ocurrence of coal seam situation; draw and be the actual release boundary position of this region up-protective layer 4 exploitation in the position that this critical value is corresponding in measured curve.
Certainly; more than illustrate and be only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the instruction of this instructions; made all equivalently to substitute, obvious form of distortion, within the essential scope all dropping on this instructions, protection of the present invention ought to be subject to.
Claims (5)
1. one kind for determine up-protective layer exploitation relief range test macro, it comprises on-the-spot test portion and laboratory test department, the coal sample obtained in on-the-spot test portion by experiment room test department is tested, it is characterized in that, laboratory test department comprises large scale Radial Flow Through Porous Media mechanism for testing, large scale Radial Flow Through Porous Media mechanism for testing is connected with an electro-hydraulic servo control oil pressure pump, electro-hydraulic servo control oil pressure pump is used for applying pressure to large scale Radial Flow Through Porous Media mechanism for testing, large scale Radial Flow Through Porous Media mechanism for testing is configured with a mass flowmeter, mass flowmeter by respective line respectively with large scale Radial Flow Through Porous Media mechanism for testing, gas extractor is connected, large scale Radial Flow Through Porous Media mechanism for testing is connected with vacuum pump by respective line, vacuum pump is connected with a methane steel cylinder by reduction valve.
2. test macro according to claim 1, it is characterized in that, above-mentioned large scale Radial Flow Through Porous Media mechanism for testing comprises a high pressure tank body, high pressure tank body top is provided with joint flange, joint flange is connected with high pressure tank body by coupling bolt nut, T-shaped piston is provided with in high pressure tank body, the vertical section of T-shaped piston is connected with electro-hydraulic servo control oil pressure pump, the horizontal segment of T-shaped piston is transversely arranged in high pressure tank body, pressure head is provided with in high pressure tank body below the horizontal segment of T-shaped piston, the permeation floral tube for placing coal sample is provided with below pressure head, permeation floral tube is connected by exhaust floral tube, the bottom of permeation floral tube is provided with gas outlet, gas outlet is connected with mass flowmeter by exhausr port, one end of a permeation floral tube is connected with vacuum pump by gas port, one end of another permeation floral tube and the other end of gas outlet are respectively arranged with pressure unit, mass flowmeter, pressure unit is all connected with a data acquisition unit, data acquisition unit is connected with a data processing centre (DPC).
3. test macro according to claim 1, it is characterized in that, above-mentioned on-the-spot test portion comprises up-protective layer, up-protective layer comprises goaf, the one end in goaf is provided with up-protective layer machine lane, the other end is provided with up-protective layer air way, the below of up-protective layer is protected seam, coal borer hole is worn as pressure measuring drill hole to release borderline region four small-bores of constructing in the floor roadway and drill site of protected seam, pressure measuring drill hole borehole bottom location draws a straight line, and unload centered by line ball center line by theory, a pressure measuring drill hole is arranged at interval of 15 meters, pressure measuring drill hole is evenly arranged, each pressure measuring drill hole is all connected with a tensimeter, pressure measuring drill hole adopts wind power slag-discharging construction technology, gather the coal sample of each pressure measuring drill hole in work progress and seal preservation, and record pressure measuring drill hole construction parameter, after pressure measuring drill hole construction, sealing of hole measures coal-bed gas pressure, records the reading of each pressure measuring drill hole corresponding pressure table every day.
4. a method of testing for test macro as claimed in claim 1, it comprises the following steps:
A, screening coal sample is positioned in permeation floral tube, then starts electro-hydraulic servo control oil pressure pump, drive T-shaped piston to move downward, apply vertical stress by pressure head to coal sample, carry out vacuum outgas subsequently, after two hours, close vacuum pump and corresponding valve; Then methane steel cylinder and reduction valve is opened, gas injection in high pressure tank body, gas injection pressure is this coal sample observed pressure value, carry out six h for equilibration absorption, then open corresponding valve and carry out the radial stable percolation experiment of large scale, inner and outer boundary pressure and gas flow when being balanced by pressure unit, mass flowmeter and data acquisition unit record;
B, data that steps A is surveyed substituted into formula (1) calculate, draw the permeability value of this coal sample under setting Vertical dimension power,
Wherein, K is the permeability of coal sample, and unit is mD or 10
-3μm; μ is the viscosity of gas, is taken as 1.087 × 10 when 20 DEG C
-5pas; p
0for the atmospheric pressure in laboratory, unit is Pa; Q
0for gas flow, unit is ml/s; p
wfor inner boundary pressure, unit is MPa; p
eouter boundary pressure, unit is MPa; r
wfor inner boundary radius, unit is cm, r
efor outer boundary radius, unit is cm; H is thickness of coal seam, and unit is cm;
C, carry out repeatedly the radial stable percolation experiment of large scale by changing coal sample and changing vertical stress, obtain the permeability of each coal sample under different vertical stress, and draw out the relation curve of infiltration and vertical stress;
D, survey coal seam permeability according to on-the-spot; determine each pressure measuring drill hole position coal body vertical stress; draw release borderline region vertical stress distribution curve; vertical release critical value is calculated according to actual ocurrence of coal seam situation; draw the position that this critical value is corresponding in measured curve, be the actual release boundary position of this region up-protective layer exploitation.
5. method of testing according to claim 4, is characterized in that, also comprises before steps A:
Coal borer hole is worn as pressure measuring drill hole to release borderline region four small-bores of constructing in the floor roadway and drill site of protected seam, pressure measuring drill hole borehole bottom location draws a straight line, and unload centered by line ball center line by theory, a pressure measuring drill hole is arranged at interval of 15 meters, pressure measuring drill hole is evenly arranged, and each pressure measuring drill hole is all connected with a tensimeter; Pressure measuring drill hole adopts wind power slag-discharging construction technology, gather the coal sample of each pressure measuring drill hole in work progress and seal preservation, and record pressure measuring drill hole construction parameter, after pressure measuring drill hole construction, sealing of hole measures coal-bed gas pressure, record each pressure measuring drill hole manometric reading every day
After pressure stabilisation, record each pressure measuring drill hole gas pressure value, adopt pressure measuring drill hole radial return algorithm to calculate each pressure measuring drill hole position Permeability Coefficent in Coal Seam, and be converted into permeability according to formula (2), obtain the coal seam permeability of each boring position;
λ=K/ (2 μ p
0) formula (2)
Wherein, K is the permeability of coal sample, and unit is mD or 10
-3μm; μ is the viscosity of gas, is taken as 1.087 × 10 when 20 DEG C
-5pas; p
0for the atmospheric pressure in laboratory, unit is Pa.
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| CN107558990A (en) * | 2017-08-17 | 2018-01-09 | 重庆大学 | A kind of high methane cherry coal drilling production quantity of slag and the test device of drilling deformation |
| CN108344675A (en) * | 2018-02-08 | 2018-07-31 | 四川大学 | Coal body adopts the test method of permeation fluid mechanics rule under the conditions of simulation protective coat extracted |
| CN112727453A (en) * | 2020-12-14 | 2021-04-30 | 重庆大学 | Method for measuring protection range of protected layer |
| CN113742940A (en) * | 2021-09-16 | 2021-12-03 | 重庆大学 | Mining pressure relief boundary space-time curve cluster determination method |
| CN113775377A (en) * | 2021-09-08 | 2021-12-10 | 西安科技大学 | BOTDA-based system and method for monitoring pressure relief range of coal rock mass under protective layer mining |
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| CN113775377A (en) * | 2021-09-08 | 2021-12-10 | 西安科技大学 | BOTDA-based system and method for monitoring pressure relief range of coal rock mass under protective layer mining |
| CN113775377B (en) * | 2021-09-08 | 2023-03-24 | 西安科技大学 | BOTDA-based system and method for monitoring pressure relief range of coal rock mass under protective layer mining |
| CN113742940A (en) * | 2021-09-16 | 2021-12-03 | 重庆大学 | Mining pressure relief boundary space-time curve cluster determination method |
| CN113742940B (en) * | 2021-09-16 | 2023-09-08 | 重庆大学 | Mining pressure relief boundary space-time curve cluster determination method |
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