CN105301202B - For determining the test system and method for testing of up-protective layer exploitation relief range - Google Patents

For determining the test system and method for testing of up-protective layer exploitation relief range Download PDF

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CN105301202B
CN105301202B CN201510822815.2A CN201510822815A CN105301202B CN 105301202 B CN105301202 B CN 105301202B CN 201510822815 A CN201510822815 A CN 201510822815A CN 105301202 B CN105301202 B CN 105301202B
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pressure
drill hole
testing
pressure measuring
coal
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CN105301202A (en
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刘震
程卫民
王刚
周刚
陈连军
聂文
辛林
于岩斌
倪冠华
杨赫
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Shandong University of Science and Technology
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Abstract

The invention discloses a kind of test system and method for testing for being used to determine up-protective layer exploitation relief range, it includes on-the-spot test portion and laboratory test department, laboratory test department includes 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 to apply 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 flowmenter, mass flowmenter by respective line respectively with large scale Radial Flow Through Porous Media mechanism for testing, gas collecting apparatus is connected, large scale Radial Flow Through Porous Media mechanism for testing is connected by respective line with vavuum pump, vavuum pump is connected by pressure-reducing valve with a methane steel cylinder.To unload the investigation of protection domain under the up-protective layer mining conditions that extinction is carried out based on crustal stress, providing scientific basis for protected coal seam digging rational deployment and safe working, improving test accuracy.

Description

For determining the test system and method for testing of up-protective layer exploitation relief range
Technical field
The present invention relates to mine gas diaster prevention and control field, more particularly to one kind to be used to determine that up-protective layer exploits release model The test system and method for testing enclosed.
Background technology
With the increase of seam mining depth, coal-bed gas pressure gradually increases with content, coal-bed gas outburst hazard by It is cumulative big.For projecting coal bed, China's outburst prevention work adheres to the principle of leading, the local outburst prevention measures supplement of region outburst prevention measures, And it is to prevent and treat most effective, the most economical regional outburst prevention measures of coal and gas prominent to exploit protective layer.The technology of protective coat extracted Principle is:Non-protruding coal seam or weak projecting coal bed conduct protective layer is selected to exploit first so that upper and lower coal and rock produces strong Tension is destroyed, and is moved, and the original crustal stress of protected coal seam is released, and cracks in coal seam fully extends, gas permeability of coal seam Significantly improve, a large amount of ADSORPTION STATE desorption of mash gas are free state, pass through gas pressure relief enhanced gas extraction so that answer protected coal seam Power, gas pressure and content further reduce, and are finally reached the purpose for eliminating protected coal seam outburst hazard.
The protecting effect and protection domain of investigation protected coal seam are needed after protective coat extracted, according to national security production supervision Manage general bureau's regulations《Prevent and treat coal and gas prominent regulation》With national security production industry standard《Protective coat extracted technical specification AQ1050-2008》Understand, determine protection domain mainly by arranging that gas pressure is surveyed in protected seam release borderline region at present Test boring, protective layer scope is determined by the contrast of original gas pressure before and after protective coat extracted and remaining gas pressure, so The gas bearing capacity calculated afterwards by surveying gas pressure further investigates protection domain, this method to calculate based on Gas explosion burns, Release effect to protective coat extracted does not fully demonstrate, and the up-protective layer of region extinction is carried out based on crustal stress opens to unload Condition is adopted, carrying out protection domain by stress index investigates more science;At present, during protective coat extracted, live work Journey technical staff evaluates the exploitation effect of protective layer, but successfully tested rate by testing protected coal seam dilatancy figureofmerit It is relatively low.
Therefore, carry out urgent need one kind when projecting coal bed protection domain is investigated and protection domain is determined by test stress index Technical method, be particularly suitable for use in determine up-protective layer exploitation protection domain technical method, can be by investigating stress index Protected coal seam digging roadway layout and prominent preventing and treating provide scientific basis, and then ensure projecting coal bed safety and high efficiency.
The content of the invention
In view of above-mentioned the deficiencies in the prior art, are used to determine that up-protective layer exploitation is unloaded it is an object of the invention to provide one kind The test system and method for testing of scope are pressed, to being protected to unload under the up-protective layer mining conditions that extinction is carried out based on crustal stress The test of scope, to improve test accuracy.
In order to solve the above technical problems, the present invention program includes:
A kind of test system for being used to determine up-protective layer exploitation relief range, it includes on-the-spot test portion and surveyed with laboratory Examination portion, the coal sample that on-the-spot test portion obtains is tested by laboratory test department, wherein, laboratory test department includes big chi Very little 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 to watch Clothes control oil pressure pump is used to apply pressure to large scale Radial Flow Through Porous Media mechanism for testing, and large scale Radial Flow Through Porous Media mechanism for testing is configured with One mass flowmenter, mass flowmenter are connected with large scale Radial Flow Through Porous Media mechanism for testing, gas collecting apparatus respectively by respective line Logical, large scale Radial Flow Through Porous Media mechanism for testing is connected by respective line with vavuum pump, and vavuum pump passes through pressure-reducing valve and a methane Steel cylinder is connected.
Described test system, wherein, above-mentioned large scale Radial Flow Through Porous Media mechanism for testing includes a high pressure tank body, high pressure tank body Top is provided with adpting flange, and adpting flange is connected by connecting bolt nut with pressure pan body phase, and T is provided with pressure pan body Type piston, the vertical section of T-shaped piston are connected with electro-hydraulic servo control oil pressure pump, and the horizontal segment of T-shaped piston is transversely arranged on height Press in tank body, pressure head is provided with the pressure pan body below the horizontal segment of T-shaped piston, is provided with below pressure head for placing coal sample Permeation floral tube, permeation floral tube is connected by being vented floral tube, and the bottom of permeation floral tube is provided with blast pipe, and blast pipe passes through row Gas port is connected with mass flowmenter, and one end of a permeation floral tube is connected by gas port with vavuum pump, another permeation flower It is respectively arranged with pressure transmitter on one end of pipe and the other end of blast pipe, mass flowmenter, pressure transmitter are with one Data acquisition unit is connected, and data acquisition unit is connected with a data processing centre.
Described test system, wherein, above-mentioned on-the-spot test portion includes up-protective layer, and up-protective layer includes goaf, adopted One end of dead zone is provided with up-protective layer machine lane, and the other end is provided with up-protective layer air way, and the lower section of up-protective layer is to be protected Layer, coal borer hole is worn as pressure measurement brill to four small-bores of release borderline region construction out of protected seam floor roadway and drill site Hole, pressure measuring drill hole borehole bottom location are drawn a straight line, and centered on theory unloads line ball center line, one is arranged at interval of 15 meters Pressure measuring drill hole, pressure measuring drill hole are evenly arranged, and each pressure measuring drill hole is connected with a pressure gauge;Pressure measuring drill hole uses wind power slag-discharging Construction technology, the coal sample of each pressure measuring drill hole is gathered in work progress and is sealed, and record pressure measuring drill hole construction parameter, pressure measurement Sealing of hole determines coal-bed gas pressure after drilling construction, records the reading of each pressure measuring drill hole corresponding pressure table daily.
A kind of method of testing, it comprises the following steps:
A, will screening coal sample be positioned in permeation floral tube, then start electro-hydraulic servo control oil pressure pump, drive T-shaped piston to Lower motion, vertical stress is applied to coal sample by pressure head, then carries out vacuum outgas, vavuum pump and corresponding valve are closed after two hours Door;Methane steel cylinder and pressure-reducing valve are then turned on, the gas injection into pressure pan body, gas injection pressure is the coal sample observed pressure value, is carried out Six hours equilibrium adsorptions, it is then turned on corresponding valve and carries out the experiment of large scale radial direction stable percolation, pass through pressure transmitter, quality Inner and outer boundary pressure and gas flow when flowmeter balances with data acquisition unit record;
B, step A surveyed into data substitute into formula (1) and calculate, draw the coal sample in setting vertically to the permeability value under power,
Formula (1)
Wherein, K is the permeability of coal sample, and unit is mD or 10-3μm;μ is the viscosity of gas, it is taken as 1.087 at 20 DEG C × 10-5Pa·s;p0For the atmospheric pressure in laboratory, unit Pa;Q0For gas flow, unit ml/s;pwFor inner boundary pressure, Unit is MPa;peExternal boundary pressure, unit MPa;rwFor inner boundary radius, unit cm, reFor external boundary radius, unit is cm;H is coal seam thickness, unit cm;
C, multiple large scale radial direction stable percolation experiment is carried out by changing coal sample and changing vertical stress, obtains each coal sample Permeability under different vertical stress, and draw out infiltration and the relation curve of vertical stress;
D, coal seam permeability is surveyed according to scene, determines each pressure measuring drill hole opening position coal body vertical stress, flanging is unloaded in drafting Battery limit (BL) domain vertical stress distribution curve, vertical release critical value is calculated according to actual ocurrence of coal seam situation, show that the critical value exists Corresponding position in measured curve, it is the actual release boundary position of the region up-protective layer exploitation.
Described method of testing, wherein, also include before step A:
Out of protected seam floor roadway and drill site the conduct of coal borer hole is worn to four small-bores of release borderline region construction Pressure measuring drill hole, pressure measuring drill hole borehole bottom location draw a straight line, and centered on theory unloads line ball center line, at interval of 15 meters of cloth A pressure measuring drill hole is put, pressure measuring drill hole is evenly arranged, and each pressure measuring drill hole is connected with a pressure gauge;Pressure measuring drill hole uses wind Power deslagging construction technology, the coal sample of each pressure measuring drill hole is gathered in work progress and is sealed, and record pressure measuring drill hole construction ginseng Number, sealing of hole determines coal-bed gas pressure after pressure measuring drill hole is constructed, and records the reading of each pressure measuring drill hole pressure gauge daily,
It is after pressure stabilisation, each pressure measuring drill hole gas pressure value is recorded, calculating each pressure measurement using pressure measuring drill hole radial return algorithm bores Hole position Permeability Coefficent in Coal Seam, and permeability is converted into according to formula (2), obtain the coal seam infiltration of each drilling position Rate;
λ=K/ (2 μ p0) formula (2)
Wherein, K is the permeability of coal sample, and unit is mD or 10-3μm;μ is the viscosity of gas, it is taken as 1.087 at 20 DEG C × 10-5Pa·s;p0For the atmospheric pressure in laboratory, unit Pa.
A kind of test system and method for testing for being used to determine up-protective layer exploitation relief range provided by the invention, can be solved Used index and means of testing single technical problem when certainly projecting coal bed protective coat extracted scope is investigated, to unload ground The investigation of protection domain under the up-protective layer mining conditions of extinction is carried out based on stress, there is provided one kind is examined with stress index The new way examined, investigation means are enriched, improve the accuracy of investigation, be protected coal seam digging rational deployment and safety open Adopt and provide scientific basis, improve test accuracy, while can effectively avoid the waste of coal resources and gas preventing and control engineering.
Brief description of the drawings
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 layers machine lane, 2- goafs, 3- up-protective layer air ways, 4- up-protective layers, 5- theories unload line ball, 6- small-bores Chuan Mei holes, 7- protected seams, 8- theories unload line ball center line, 9- pressure measuring drill holes, 10- floor roadway and drill site, 11- pressures Power table, 12- electro-hydraulic servo control oil pressure pumps, 13- large scale Radial Flow Through Porous Media mechanism for testing, 14- mass flowmenters, 15- valve d, 16- gas collecting apparatus, 17- data processing centres, 18- data acquisition units, 19- pressure transmitters, 20- vavuum pumps, 21- pressure-reducing valves, 22- methane steel cylinders, 23- connecting bolt nuts, 24- adpting flanges, 25-T type pistons, 26- sealing rings, 27- high pressure tank bodies, 28- Pressure head, 29- exhaust floral tubes, 30- permeation floral tubes, 31- gas ports, 32- exhaust outlets.
Embodiment
The invention provides a kind of test system and method for testing for being used to determine up-protective layer exploitation relief range, to make The purpose of the present invention, technical scheme and effect are clearer, clear and definite, and the present invention is described in more detail below.It should be appreciated that The specific embodiments described herein are merely illustrative of the present invention, is not intended to limit the present invention.
The invention provides a kind of for determining that up-protective layer exploits the test system of relief range, as shown in Figures 1 and 2 , it includes on-the-spot test portion and laboratory test department, and the coal sample that on-the-spot test portion obtains is carried out by laboratory test department Test, wherein, laboratory test department includes large scale Radial Flow Through Porous Media mechanism for testing 13, large scale Radial Flow Through Porous Media mechanism for testing 13 and One electro-hydraulic servo control oil pressure pump 12 is connected, and electro-hydraulic servo control oil pressure pump 12 is used for large scale Radial Flow Through Porous Media mechanism for testing 13 apply pressure, and large scale Radial Flow Through Porous Media mechanism for testing 13 is configured with a mass flowmenter 14, and mass flowmenter 14 is by corresponding Pipeline is connected with large scale Radial Flow Through Porous Media mechanism for testing 13, gas collecting apparatus 16 respectively, large scale Radial Flow Through Porous Media mechanism for testing 13 It is connected by respective line with vavuum pump 20, vavuum pump 20 is connected by pressure-reducing valve 21 with a methane steel cylinder 22.
Further, as shown in Figure 3, above-mentioned large scale Radial Flow Through Porous Media mechanism for testing 13 includes a high pressure tank body 27, The top of high pressure tank body 27 is provided with adpting flange 24, and adpting flange 24 is connected by connecting bolt nut 23 with high pressure tank body 27 Connecing, T-shaped piston 25 is provided with 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, is set in the high pressure tank body 27 below the horizontal segment of T-shaped piston 25 Pressure head 28 is equipped with, the lower section of pressure head 28 is provided with the permeation floral tube 30 for placing coal sample, and permeation floral tube 30 is by being vented floral tube 29 It is connected, the bottom of permeation floral tube 30 is provided with blast pipe, and blast pipe is connected by exhaust outlet 32 with mass flowmenter 14, and one One end of individual permeation floral tube 30 is connected by gas port 31 with vavuum pump 20, one end of another permeation floral tube 30 and blast pipe The other end on be respectively arranged with pressure transmitter 19, mass flowmenter 14, pressure transmitter 19 with a data acquisition unit 18 It is connected, data acquisition unit 18 is connected with a data processing centre 17, and data processing centre 17 is typically using skills such as computers Art form.
In another preferred embodiment of the present invention, above-mentioned on-the-spot test portion includes up-protective layer 4, and up-protective layer 4 includes Goaf 2, the one end in goaf 2 are provided with up-protective layer machine lane 1, and the other end is provided with up-protective layer air way 3, up-protective layer 4 Lower section be protected seam 7, from the floor roadway and drill site 10 of protected seam 7 in constructed four small-bores to release borderline region Wear coal borer hole 6 and be used as pressure measuring drill hole 9, the borehole bottom location of pressure measuring drill hole 9 draws a straight line, and is unloaded with theory during line ball center line 8 is The heart, at interval of 15 meters of arrangements, one pressure measuring drill hole 9, pressure measuring drill hole 9 is evenly arranged, each pressure measuring drill hole 9 with a pressure gauge 11 are connected;Pressure measuring drill hole 9 uses wind power slag-discharging construction technology, and coal sample and the sealing of each pressure measuring drill hole 9 are gathered in work progress Preserve, and record the construction parameter of pressure measuring drill hole 9, sealing of hole measure coal-bed gas pressure after pressure measuring drill hole 9 is constructed, daily note Record the reading of each pressure measuring drill hole corresponding pressure table.
Present invention also offers a kind of method of testing using above-mentioned test system, 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 starts electro-hydraulic servo control Oil pressure pump 12, drive T-shaped piston 25 to move downward, vertical stress applied to coal sample by pressure head 28, then carries out vacuum outgas, Vavuum pump 20 and valve 15b, valve 15a are closed after two hours;Methane steel cylinder 22 and pressure-reducing valve 21 are then turned on, to high pressure tank body Gas injection in 27, gas injection pressure are the coal sample observed pressure value, carry out six hours equilibrium adsorptions, are then turned on valve 15c, valve 15d carries out the experiment of large scale radial direction stable percolation, is recorded by pressure transmitter 19, mass flowmenter 14 and data acquisition unit 18 Inner and outer boundary pressure and gas flow during balance;
B, step A surveyed into data substitute into formula (1) and calculate, draw the coal sample in setting vertically to the permeability value under power,
Formula (1)
Wherein, K is the permeability of coal sample, and unit is mD or 10-3μm;μ is the viscosity of gas, it is taken as 1.087 at 20 DEG C × 10-5Pa·s;p0For the atmospheric pressure in laboratory, unit Pa;Q0For gas flow, unit ml/s;pwFor inner boundary pressure, Unit is MPa;peExternal boundary pressure, unit MPa;rwFor inner boundary radius, unit cm, reFor external boundary radius, unit is cm;H is coal seam thickness, unit cm;
C, multiple large scale radial direction stable percolation experiment is carried out by changing coal sample and changing vertical stress, obtains each coal sample Permeability under different vertical stress, and draw out infiltration and the relation curve of vertical stress;
D, coal seam permeability is surveyed according to scene, determines each opening position coal body vertical stress of pressure measuring drill hole 9, flanging is unloaded in drafting Battery limit (BL) domain vertical stress distribution curve, vertical release critical value is calculated according to actual ocurrence of coal seam situation, show that the critical value exists Corresponding position in measured curve, it is the actual release boundary position of the region up-protective layer exploitation.
Further, as shown in Figure 1, also include before step A:
Out of protected seam 7 floor roadway and drill site 10 coal borer hole 6 is worn to four small-bores of release borderline region construction As pressure measuring drill hole 9, the borehole bottom location of pressure measuring drill hole 9 draws a straight line, and centered on theory unloads line ball center line 8, at interval of 15 meters of uniform pressure measuring drill holes 9, pressure measuring drill hole 9 are evenly arranged, and each pressure measuring drill hole 9 is connected with a pressure gauge 11; Pressure measuring drill hole 9 uses wind power slag-discharging construction technology, gathers the coal sample of each pressure measuring drill hole 9 in work progress and is sealed, herein Coal sample tested for step A- steps D, and record the construction parameter of pressure measuring drill hole 9, pressure measuring drill hole 9 construct after sealing of hole Coal-bed gas pressure is determined, records the reading of each pressure measuring drill hole pressure gauge daily,
It is after pressure stabilisation, each pressure measuring drill hole gas pressure value is recorded, calculating each pressure measurement using the radial return algorithm of pressure measuring drill hole 9 bores The position Permeability Coefficent in Coal Seam of hole 9, and permeability is converted into according to formula (2), the coal seam for obtaining each drilling position is oozed Saturating rate;
λ=K/ (2 μ p0) formula (2)
Wherein, K is the permeability of coal sample, and unit is mD or 10-3μm;μ is the viscosity of gas, it is taken as 1.087 at 20 DEG C × 10-5Pa·s;p0For the atmospheric pressure in laboratory, unit Pa.
In order to which the present invention is further described, it is exemplified below more detailed embodiment and illustrates.
Step a, according to protective coat extracted condition, with reference to national security production industry standard《Protective coat extracted technical specification AQ1050-2008》Determine that the theory of protected seam 7 unloads line ball center line 8, after up-protective layer 4 is exploited, in the floor roadway of protected seam 7 And drill site 10 in release borderline region construct 4 small-bores (Φ 46mm) wear coal borer hole 6 be used as pressure measuring drill hole 9, i.e. 1#, 2#, 3# and 4#, the borehole bottom location of pressure measuring drill hole 9 connect being aligned, and centered on theory unloads line ball center line 8, interval 15m is evenly arranged, and is surveyed Pressure drilling 9 uses wind power slag-discharging construction technology, gathers the coal sample of each pressure measuring drill hole 9 in work progress and is sealed, remembers simultaneously The construction parameter of pressure measuring drill hole 9 is recorded, sealing of hole measure coal-bed gas pressure after pressure measuring drill hole 9 is constructed, records each drilling pressure daily The reading of power table 11;
Step b, it is after pressure stabilisation, each drilling gas pressure value is recorded, each drilling is calculated using the radial return algorithm of pressure measuring drill hole 9 Position Permeability Coefficent in Coal Seam, and according to formula λ=K/ (2 μ p0) permeability is converted into, obtain each drilling position Coal seam permeability;
Step c, the collection in worksite coal sample of 1#, 2#, 3# and 4# pressure measuring drill hole 9 is sieved, then chooses one of them The coal sample of pressure measuring drill hole 9, for example choose 1# coal samples and be uniformly positioned in permeation floral tube 30 (internal diameter Φ 300mm), then install pressure First 28, T-shaped piston 25 and adpting flange 24, attaching nut's bolt 23 is tightened, starts electro-hydraulic servo control oil pressure pump 12, T-shaped work Plug 25 moves downward, and applies vertical stress, after reaching setting value, turn-on data acquisition system and vacuum to coal sample by pressure head 28 Pump 20, vacuum outgas 2h is carried out to coal sample, is then shut off vavuum pump 20 and valve 15a, opens methane steel cylinder 22 and pressure-reducing valve 21, Methane gas is injected in high pressure tank body 27 by gas port 31, and the outlet pressure of pressure-reducing valve 21 is adjusted to the coal sample and corresponds to pressure measuring drill hole 9 Actual measurement gas pressure value, carry out six hours equilibrium adsorptions, be then turned on valve 15c, valve 15d, carry out large scale coal sample Radial direction stable percolation is tested, and passes through pressure transmitter 19, mass flowmenter 14 and data acquisition unit 18 and data processing centre Inner and outer boundary pressure and gas flow during 17 record balance;
Step d, above-mentioned the data obtained is substituted into formula (1)
By can be calculated the coal sample in setting vertically to the permeability value under power;
Step e, change vertical stress, and repeat stable percolation experiment, you can draw the coal sample it is different it is vertical should Coal-bed gas permeability under power, large scale Radial Flow Through Porous Media experiment equally is carried out to other 3 coal samples, obtain each coal sample and hung down in difference Permeability under to stress, the border seepage pressure tested every time is each field measurement gas pressure of pressure measuring drill hole 9, according to experiment As a result, infiltration and the relation curve of vertical stress are drawn out;
Step f, coal seam permeability value is surveyed according to scene, determines each opening position coal body vertical stress of pressure measuring drill hole 9, drawn Release borderline region vertical stress is distributed scatter diagram, and is fitted, and calculating vertical release according to actual ocurrence of coal seam situation faces Dividing value, the critical value corresponding position in measured curve is drawn, be the actual release border of the region up-protective layer 4 exploitation Position.
Certainly, described above is only presently preferred embodiments of the present invention, and the present invention is not limited to enumerate above-described embodiment, should When explanation, any those skilled in the art are all equivalent substitutes for being made, bright under the teaching of this specification Aobvious variant, all falls within the essential scope of this specification, ought to be protected by the present invention.

Claims (3)

1. a kind of test system for being used to determine up-protective layer exploitation relief range, it includes on-the-spot test portion and tested with laboratory Portion, the coal sample that on-the-spot test portion obtains is tested by laboratory test department, it is characterised in that laboratory test department includes Large scale Radial Flow Through Porous Media mechanism for testing, large scale Radial Flow Through Porous Media mechanism for testing are connected with an electro-hydraulic servo control oil pressure pump, electricity Liquid SERVO CONTROL oil pressure pump is used to apply pressure to large scale Radial Flow Through Porous Media mechanism for testing, and large scale Radial Flow Through Porous Media mechanism for testing is matched somebody with somebody Be equipped with a mass flowmenter, mass flowmenter by respective line respectively with large scale Radial Flow Through Porous Media mechanism for testing, gas collecting apparatus It is connected, large scale Radial Flow Through Porous Media mechanism for testing is connected by respective line with vavuum pump, and vavuum pump passes through pressure-reducing valve and one Methane steel cylinder is connected;The large scale Radial Flow Through Porous Media mechanism for testing includes a high pressure tank body, and high pressure tank body top is provided with company Acting flange, adpting flange are connected by connecting bolt nut with pressure pan body phase, and T-shaped piston, T-shaped work are provided with pressure pan body The vertical section of plug is connected with electro-hydraulic servo control oil pressure pump, and the horizontal segment of T-shaped piston is transversely arranged in pressure pan body, T-shaped Pressure head is provided with pressure pan body below the horizontal segment of piston, the permeation floral tube for placing coal sample is provided with below pressure head, Permeation floral tube is connected by being vented floral tube, and the bottom of permeation floral tube is provided with blast pipe, and blast pipe passes through exhaust outlet and quality Flowmeter is connected, and one end of a permeation floral tube is connected by gas port with vavuum pump, one end of another permeation floral tube with And pressure transmitter is respectively arranged with the other end of blast pipe, mass flowmenter, pressure transmitter with a data acquisition unit It is connected, data acquisition unit is connected with a data processing centre;The permeation floral tube internal diameter is 300mm;Above-mentioned on-the-spot test Portion includes up-protective layer, and up-protective layer includes goaf, and the one end in goaf is provided with up-protective layer machine lane, and the other end is provided with Up-protective layer air way, the lower section of up-protective layer is protected seam, to release border out of protected seam floor roadway and drill site Region four small-bores of construction are worn coal borer hole and drawn a straight line as pressure measuring drill hole, pressure measuring drill hole borehole bottom location, and with theory Centered on unloading line ball center line, at interval of 15 meters of arrangements, one pressure measuring drill hole, pressure measuring drill hole is evenly arranged, and each pressure measuring drill hole is equal It is connected with a pressure gauge;Pressure measuring drill hole uses wind power slag-discharging construction technology, and the coal sample of each pressure measuring drill hole is gathered in work progress And be sealed, and pressure measuring drill hole construction parameter is recorded, sealing of hole measure coal-bed gas pressure after pressure measuring drill hole is constructed, daily Record the reading of each pressure measuring drill hole corresponding pressure table.
2. a kind of method of testing of test system 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 transport downwards It is dynamic, vertical stress is applied to coal sample by pressure head, then carries out vacuum outgas, vavuum pump and corresponding valve are closed after two hours; Methane steel cylinder and pressure-reducing valve are then turned on, the gas injection into pressure pan body, gas injection pressure is the coal sample observed pressure value, and it is small to carry out six When equilibrium adsorption, be then turned on corresponding valve and carry out the experiment of large scale radial direction stable percolation, pass through pressure transmitter, mass flow Inner and outer boundary pressure and gas flow when meter balances with data acquisition unit record;
B, step A surveyed into data substitute into formula (1) and calculate, draw the coal sample in setting vertically to the permeability value under 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 at 20 DEG C- 5Pa·s;p0For the atmospheric pressure in laboratory, unit Pa;Q0For gas flow, unit ml/s;pwIt is single for inner boundary pressure Position is MPa;peExternal boundary pressure, unit MPa;rwFor inner boundary radius, unit cm, reFor external boundary radius, unit is cm;H is coal seam thickness, unit cm;
C, multiple large scale radial direction stable percolation experiment is carried out by changing coal sample and changing vertical stress, obtains each coal sample not With the permeability under vertical stress, and draw out infiltration and the relation curve of vertical stress;
D, coal seam permeability is surveyed according to scene, determines each pressure measuring drill hole opening position coal body vertical stress, draw release frontier district Domain vertical stress distribution curve, vertical release critical value is calculated according to actual ocurrence of coal seam situation, show that the critical value is being surveyed Corresponding position in curve, it is the actual release boundary position of the region up-protective layer exploitation.
3. method of testing according to claim 2, it is characterised in that also include before step A:
Coal borer hole is worn as pressure measurement to four small-bores of release borderline region construction out of protected seam floor roadway and drill site Drilling, pressure measuring drill hole borehole bottom location draw a straight line, and centered on theory unloads line ball center line, at interval of 15 meters of arrangements one Individual pressure measuring drill hole, pressure measuring drill hole are evenly arranged, and each pressure measuring drill hole is connected with a pressure gauge;Pressure measuring drill hole is arranged using wind-force Slag construction technology, the coal sample of each pressure measuring drill hole is gathered in work progress and is sealed, and record pressure measuring drill hole construction parameter, survey Sealing of hole determines coal-bed gas pressure after pressing drilling construction, records the reading of each pressure measuring drill hole pressure gauge daily,
It is after pressure stabilisation, each pressure measuring drill hole gas pressure value is recorded, each pressure measuring drill hole institute is calculated using pressure measuring drill hole radial return algorithm Permeability is converted into position Permeability Coefficent in Coal Seam, and according to formula (2), obtains the coal seam permeability of each drilling position;
λ=K/ (2 μ p0) 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 at 20 DEG C- 5Pa·s;p0For the atmospheric pressure in laboratory, unit Pa.
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