CN106124380B - The device and method of coal column gas permeability is measured in a kind of similarity simulation experiment - Google Patents
The device and method of coal column gas permeability is measured in a kind of similarity simulation experiment Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 164
- 230000035699 permeability Effects 0.000 title claims abstract description 50
- 238000004088 simulation Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 23
- 239000011435 rock Substances 0.000 claims description 12
- 230000033001 locomotion Effects 0.000 claims description 10
- 238000002474 experimental method Methods 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229920001971 elastomer Polymers 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 2
- 230000006837 decompression Effects 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 238000011160 research Methods 0.000 abstract description 8
- 238000000605 extraction Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 210000001072 colon Anatomy 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses the device and methods that coal column gas permeability is measured in a kind of similarity simulation experiment, belong to similarity simulation experiment field.The device includes coal column inclusion enclave, and the structure of coal column inclusion enclave is identical as surveyed coal column, and inclusion enclave inner surface is fitted closely with internal coal column by clamp device；The coal column inclusion enclave is a rectangular parallelepiped structure, is separately connected high-pressure hose on opposite two faces of cuboid, one end is inlet end, and the other end is outlet side；Inlet end provides the measurement methane gas that permeability needs, and outlet side is respectively communicated with vacuum pump and atmosphere.Permeability test is applied in similarity simulation experiment by the present invention, can especially test the changing rule of certain size coal column gas permeability when coal column two sides excavate to form the different old dead zones of size (corresponding to the differently stressed state of coal column)；The research of otherness rule of different size coal column gas permeabilities under identical stress state can further be studied by changing coal column inclusion enclave size.
Description
Technical field
The present invention relates to the analog simulation measuring devices and method of coal and rock seepage flow, and in particular to a kind of similarity simulation experiment
The device and method of middle measurement coal column gas permeability, belongs to similarity simulation experiment field.
Background technique
Equivalent material simulating is a kind of foundation on the basis of the theory of similarity, with the model expanded or shunk, research is gone to correspond to
A kind of experimental method of the mechanical motion of prototype and other correlation properties.This method is in mine, geology, water conservancy and building etc.
Field is widely used.In field of mining, this method has been widely used for such as measurement mine to press, and formation damage is migrated, ground
The research of the problems such as lower water penetration and stability of slope without circulating water.
In coal underground mining activity, since the continuous variation face surrounding rock of mine pressure can occur in the difference stage of adopting
Different degrees of destruction causes the gas permeability of country rock (including coal column) to change in turn.Since historical reasons and mining conditions limit
It makes, there is different coal column of taking measurements greatly between the adjacent goaf of China's coal-mine, gas permeability changes meeting so that coal column
Two sides gas generates migration.Study connectivity of the gas permeability for adjacent goaf of these coal columns, the association of old empty interval gas
It is of great significance with extraction.
Currently, there is no the patent and document in relation to being directed to coal column permeability measurement in similarity simulation experiment.Existing gas permeability
The device of measurement is that coal body or rock mass are made to standard sample (50mm x 100mm), is put into experiment cavity and measures.This
Kind method cannot react the Evolution of different size coal column gas permeabilities under action of underground in digging process, nothing strictly according to the facts
Method simulates the gas permeability variation of coal column under the conditions of real working condition completely.
Chinese patent CN103076198A discloses a kind of coal and gas power phenomenon analog simulation experimental device, can be real-time
The permeability variation of overlying strata in recovery process is monitored, the evolution for cranny development and crack field provides reference frame.But this is specially
The problem of research object that benefit is directed to is overlying rock, while the device is expensive, air-tightness is not easy to solve, for old dead zone
The experimental provision of vital coal column gas permeability Quality Research and method are rarely reported in extraction.
Summary of the invention
In view of the above-mentioned problems, the present invention, which provides one kind, can be used in similarity simulation experiment different size coal columns in two sides difference
The device and method of permeability measurement under the conditions of size goaf (the differently stressed state in top).
The present invention provides the device that coal column gas permeability is measured in a kind of similarity simulation experiment, including coal column inclusion enclave, coals
The structure of column inclusion enclave is identical as surveyed coal column, and for the laying of certain size coal column, inclusion enclave inner surface and internal coal column are logical
Clamp device is crossed to fit closely；
The coal column inclusion enclave is a rectangular parallelepiped structure, is separately connected high-pressure hose on opposite two faces of cuboid,
One end is inlet end, and the other end is outlet side；It is successively arranged the first valve on the high-pressure hose of the inlet end, pressure gauge, subtracts
Pressure valve, high-pressure cylinder；There is methane gas in high-pressure cylinder, in order to provide the measurement methane gas that permeability needs；
The second valve, flowmeter, tee tube are successively arranged on the high-pressure hose of the outlet side, wherein the side of tee tube
Third valve and vacuum pump are connected, the other side is connected to atmosphere by the 4th valve.
In above-mentioned apparatus, the material of the coal column inclusion enclave is flexible polyurethane material.The material is able to bear certain gas
Pressure, and can preferably transmit the stress from overlying rock.
The coal column inclusion enclave size can carry out corresponding selection according to the actual size for the coal column simulated；Coal column packet
It wraps up in body and connects high-pressure hose by air inlet and air outlet respectively, be respectively equipped with screw thread in air inlet and air outlet, pass through screw thread
It is connect with high-pressure hose；The clamp device includes screw rod, nut, and screw rod passes through two blocks of rubber being arranged before and after coal column inclusion enclave
Plate is tightened with nut.Screw rod, nut and rubber slab form two sides clamp device, and inclusion enclave is close to coal column when tightening, and make device in Gas
Body will not be flowed from the gap between them.
The present invention provides a kind of methods using above-mentioned apparatus measurement coal column gas permeability, comprising the following steps:
It 1), will be using the similar mould with simulated coal seam with identical proportion when building analog simulation testing stand laying coal seam
Quasi- material is packed into coal column inclusion enclave by air inlet, and filling is plentiful, and consolidates to degree identical be laid with coal seam；
2) after standing 10~15min, coal column inclusion enclave inlet end to be closed with sealing nut, gas outlet connects vacuum pump,
Proportion by simulating coal column material calculates the water content and moisture content of coal column, then extracts excessive moisture out using vacuum pump,
So that coal column is wrapped up intracorporal coal column moisture content and is reduced to C；
3) gas outlet for being enclosed with the coal column of coal column inclusion enclave is closed with sealing nut, is put into predetermined position, remove coal column
Except remaining position coal seam and rock stratum within the same time according to conventional similar simulation experimental method be laid with；
4) after model installs, for the stabilization of Controlling model material mechanical performance, start to measure after placing 72h, often
Interval digs down 50g material from boundary for 24 hours, is placed in insulating box and carries out hygrometry, and the temperature of insulating box is according to temperature when experiment
It can appropriate adjustment；When moisture content reaches C, the excavation work that channel steel carries out model is removed；
5) it after the completion of excavating for the first time, is formed completely to goaf, movement is stablized, and air inlet, gas outlet are removed
Sealing nut, be sequentially connected the first valve, pressure gauge, pressure reducing valve, high-pressure cylinder on the high-pressure hose of inlet end；Outlet side
The second valve, flowmeter, tee tube are sequentially connected on high-pressure hose, wherein the side connection third valve and vacuum of tee tube
Pump, the other side are connected to atmosphere by the 4th valve；Clamp device is tightened, setup test；
6) when testing, it is first shut off the first valve, the 4th valve, opens the second valve, third valve, opening vacuum pump will
Pipeline is evacuated to vacuum；
7) third valve is closed, the 4th valve is opened, so that coal column is restored to atmospheric pressure together with air outlet side pipeline；
8) the first valve, high-pressure cylinder switch are opened, opens pressure reducing valve to pressure P, methane gas will be transported along coal column
Pressure gauge, flowmeter registration are observed and recorded when shifting；
9) according to pressure gauge, flowmeter registration, the dynamic viscosity of binding test gas is calculated using Darcy's law formula
The permeability K of coal column1；
10) then carry out excavating in real time for second, excavate and complete the circulation step 6 after movement is stablized)~9),
The gas permeability K of the second excavation period coal column can be obtained2；
11) equal circulation step 6 after completing after movement is stablized is excavated every time)~9) until excavating all complete
At；So far the permeability K of coal column under all cutting status is obtained1-Kn。
The method of coal column gas permeability is measured in the similarity simulation experiment, it is characterised in that: excavate moment coal rock layer and contain
The value of water rate C is 4%~8%.
The method of coal column gas permeability is measured in the similarity simulation experiment, it is characterised in that: the coal column package simulated
Body size can be chosen with the size for the coal column simulated；Coal column inclusion enclave containing coal column put to predetermined position by mould
Quasi- scheme determines.
The method of coal column gas permeability is measured in the similarity simulation experiment, it is characterised in that: experiment can pass through decompression
Valve regulation admission pressure P obtains permeable sandstone rule of the coal column in certain stress state, different gas pressures.
Beneficial effects of the present invention:
(1) permeability test is applied in similarity simulation experiment, can especially tests certain size coal column in coal column two
The changing rule of gas permeability when side excavates to form the different old dead zones of size (corresponding to the differently stressed state of coal column), to differentiate
A possibility that old dead zone coal bed gas collaboration extraction, provides foundation；
(2) it is tested in the gap of excavation, realizes the measurement of coal column gas permeability under real-time action of underground；Simultaneously
The otherness rule of different size coal column gas permeabilities under identical stress state can further be studied by changing coal column inclusion enclave size
Research；
(3) present apparatus can be realized by changing air inlet end pressure: gas pressure is to different size coal columns (by real-time mine
Under pressure) the influence Quality Research of gas permeability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of measuring device of the present invention.
Fig. 2 is the main view of coal column inclusion enclave.
Fig. 3 is the top view of Fig. 2.
Fig. 4 is the left view of Fig. 2.
1 is high-pressure cylinder in figure, and 2 be pressure reducing valve, and 3 be high-pressure hose, and 4 be the first valve, and 5 be pressure gauge, and 6 be coal column packet
Body is wrapped up in, 6-1 is air inlet, and 6-2 is gas outlet, and 6-3 is screw rod, and 6-4 is nut, and 6-5 is rubber slab, and 7 be the second valve, and 8 are
Flowmeter, 9 be tee tube, and 10 be third valve, and 11 be vacuum pump, and 12 be the 4th valve, and 13 be simulation coal column.
Specific embodiment
The present invention is further illustrated below by embodiment, but is not limited to following embodiment.
Embodiment 1:
It is as shown in Figures 1 to 3: the device of coal column gas permeability, including coal column inclusion enclave 6 are measured in a kind of similarity simulation experiment,
The structure of coal column inclusion enclave 6 is identical as surveyed coal column, this 6 meters of coal seam thickness, likelihood ratio 1:100 of experiment, the coal column of simulation
Having a size of length × width × height=20cm × 20cm × 6cm；Inclusion enclave inner surface is fitted closely with internal coal column by clamp device；
The coal column inclusion enclave 6 is a rectangular parallelepiped structure, is separately connected high-pressure hose on opposite two faces of cuboid
3, one end is inlet end, and the other end is outlet side；The first valve 4, pressure gauge are successively arranged on the high-pressure hose of the inlet end
5, pressure reducing valve 2, high-pressure cylinder 1；There is methane gas in high-pressure cylinder 1, in order to provide the measurement methane gas that permeability needs；
It is successively arranged the second valve 7, flowmeter 8, tee tube 9 on the high-pressure hose of the outlet side, wherein tee tube 9
Side connects third valve 10 and vacuum pump 11, and the other side is connected to atmosphere by the 4th valve 12.
In above-mentioned apparatus, the material of the coal column inclusion enclave 6 is flexible polyurethane material.The material is able to bear certain gas
Pressure, and can preferably transmit the stress from overlying rock.
In above-mentioned apparatus, the size of the coal column inclusion enclave 6 can carry out opposite according to the actual size for the coal column simulated
The selection answered；Coal column inclusion enclave 6 connects high-pressure hose, air inlet 6-1 and outlet with gas outlet 6-2 by air inlet 6-1 respectively
It is respectively equipped with screw thread in mouth 6-1, is connect by screw thread with high-pressure hose 3；The clamp device includes screw rod 6-3, nut 6-4,
Screw rod 6-3 passes through two pieces of rubber slab 6-5 being arranged before and after coal column inclusion enclave, is tightened with nut 6-4.Screw rod 6-3, nut 6-4 and
Rubber slab 6-5 forms two sides clamp device, and inclusion enclave is close to coal column when tightening, and makes methane gas will not be from the gap between them
Flowing.
Using the method for above-mentioned apparatus measurement coal column gas permeability, mainly comprise the steps that
1) when building analog simulation testing stand, coal column some materials are packed into coal column packet from air inlet 6-1 when being laid with coal seam
Body 6 is wrapped up in, fills as far as possible plentiful, and is consolidated to degree identical with same coal seam；Coal seam thickness is 5cm in the present embodiment, setting
Coal column inclusion enclave and pillar size (size is the same) are length × width × height=15cm × 20cm × 5cm.
2) after standing 15min, coal column inclusion enclave air inlet 6-1 is closed with sealing nut, gas outlet 6-2 connection vacuum pump
11, the coal column material mixture ratio number of the present embodiment is that 528 (analog simulation is material aggregate (sand) and cementitious material (stone with colon
Grey gypsum) ratio), it is 234ml which, which wraps up intracorporal coal column water content, and moisture content 9.10% is computed and uses vacuum
11 extraction 93.6ml water of pump, so that the coal column moisture content in coal column inclusion enclave 6 is reduced to 6%,
3) the gas outlet 6-2 for being enclosed with the coal column of coal column inclusion enclave 6 is also closed with sealing nut after, is put into and is spread
It, will in this test if in the position of that layer of coal seam, remaining position coal seam and rock stratum are conventionally laid within the same time
Coal column and coal column inclusion enclave have been embedded in coal seam layer position along the center of analog simulation shelf length extending direction, i.e. coal column packet
Wrap up in distance of the body center away from right boundary be 150cm (analog simulation shelf length × width × height=300cm × 20cm ×
200cm)；
4) it after model installs, for the stabilization of Controlling model material mechanical performance, is dug in 72h from boundary at interval of 24
Lower 50g material, which is placed in insulating box, carries out hygrometry, when moisture content reaches 6%, removes the excavation work that channel steel carries out model
Make；
5) 10cm respectively being excavated on coal column inclusion enclave left side, right side, is formed completely to goaf, movement is stablized,
Equipment shown in Fig. 1 is sequentially connected by the sealing nut for removing air inlet 6-1, gas outlet 6-2 in order, by clamp device tune
Tightly, setup test；
6) when testing, it is first shut off the first valve 4, the 4th valve 12, opens the second valve 7, third valve 10, is opened true
Pipeline is evacuated to vacuum by sky pump；
7) third valve 10 is closed, the 4th valve 12 is opened, so that coal column is restored to atmospheric pressure together with air outlet side pipeline；
8) the first valve 4, the switch of high-pressure cylinder 1 are then turned on, opening pressure reducing valve makes inlet pressure be maintained at 0.5MPa, by
In coal wall two sides, there are pressure difference methane gas to migrate along coal column；Moment observes and records pressure gauge, flowmeter registration；
9) according to pressure gauge, flowmeter registration, the dynamic viscosity of binding test gas, according to Darcy formula, gas infiltration
The calculation formula of rate are as follows:
In formula:
K- gas permeability,
A- coal column sectional area (coal column is thick high)
L- coal column length,
P1First pressure gauge registration, P2Second pressure gauge registration,
μ-gas viscosity,
Q- flow flow-meter,
The current coal column gas permeability K excavated under the period can be calculated1。
10) then coal column left side, right side goaf are excavated respectively to 20cm, excavates and completes to stablize to movement
Circulation step 6 afterwards)~9), the gas permeability K of the second excavation period coal column can be obtained2。
11) excavate every time and complete the equal circulation step 6 after movement is stablized)~9) be fully completed until excavating.
Goaf is excavated always to being 100cm at left and right sides of this coal column, so far obtains the permeability K of coal column1-K10。
Foregoing invention example only as an example of, can pass through to change when two sides goaf size is different asymmetric in practice and excavate
Scheme carries out coal column gas permeability Quality Research under the size of two sides difference goaf；Pillar size is in present example simultaneously
20cm × 20cm × 6cm changes coal column difference length to height ratio in actual experiment, can study the gas permeability difference of different coal columns.
Claims (5)
1. measuring the device of coal column gas permeability in a kind of similarity simulation experiment, it is characterised in that: including coal column inclusion enclave, coal column packet
The structure for wrapping up in body is identical as surveyed coal column, and inclusion enclave inner surface is fitted closely with internal coal column by clamp device；
Coal column inclusion enclave is a rectangular parallelepiped structure, is separately connected high-pressure hose on opposite two faces of cuboid, one end be into
Gas end, the other end are outlet side；The first valve, pressure gauge, pressure reducing valve, high pressure are successively arranged on the high-pressure hose of the inlet end
Steel cylinder；Methane gas is equipped in high-pressure cylinder；The second valve, flowmeter, three are successively arranged on the high-pressure hose of the outlet side
Siphunculus, wherein the side connection third valve of tee tube and vacuum pump, the other side are connected to atmosphere by the 4th valve；
Described device measurement coal column gas permeability method the following steps are included:
It 1), will be using the analog simulation material with simulated coal seam with identical proportion when building analog simulation testing stand laying coal seam
Material is packed into coal column inclusion enclave by air inlet, and filling is plentiful, and consolidates to degree identical be laid with coal seam；
2) after standing 10 ~ 15min, coal column inclusion enclave inlet end is closed with sealing nut, gas outlet connects vacuum pump, passes through institute
The proportion of simulation coal column material calculates the water content and moisture content of coal column, then extracts excessive moisture out using vacuum pump, makes coal
Column wraps up intracorporal coal column moisture content and is reduced to C；
3) gas outlet for being enclosed with the coal column of coal column inclusion enclave is closed with sealing nut, is put into predetermined position, in addition to coal column
The coal seam and rock stratum of remaining position are laid within the same time according to conventional similar simulation experimental method；
4) after model installs, for the stabilization of Controlling model material mechanical performance, start to measure after placing 72h, at interval of
50g material is dug down from experimental bench boundary for 24 hours, is placed in insulating box and carries out hygrometry, when moisture content reaches C, removes channel steel
Carry out the excavation work of model；
5) for the first time excavate after the completion of, formed completely to goaf, movement stablize, remove air inlet, gas outlet it is close
Nut is sealed, is sequentially connected the first valve, pressure gauge, pressure reducing valve, high-pressure cylinder on the high-pressure hose of inlet end；The high pressure of outlet side
The second valve, flowmeter, tee tube are sequentially connected on hose, wherein the side connection third valve and vacuum pump of tee tube, separately
Side is connected to atmosphere by the 4th valve；The clamp device of coal column inclusion enclave is tightened, setup test；
6) when testing, it is first shut off the first valve, the 4th valve, opens the second valve, third valve, opens vacuum pump for pipeline
It is evacuated to vacuum；
7) third valve is closed, the 4th valve is opened, so that coal column is restored to atmospheric pressure together with air outlet side pipeline；
8) the first valve, high-pressure cylinder switch are then turned on, opens pressure reducing valve to pressure P, methane gas will be transported along coal column
Pressure gauge, flowmeter registration are observed and recorded when shifting；
9) according to pressure gauge, flowmeter registration, the dynamic viscosity of binding test gas calculates coal column using Darcy's law formula
Permeability K1；
10) then carry out excavating in real time for second, excavate and complete the circulation step 6 after movement is stablized) ~ 9)
Obtain the gas permeability K of the second excavation period coal column2；
11) excavate every time and complete the equal circulation step 6 after movement is stablized) ~ 9) be fully completed until excavating；So far it obtains
Obtain the permeability K of coal column under all cutting status1-Kn。
2. measuring the device of coal column gas permeability in similarity simulation experiment according to claim 1, it is characterised in that: the coal
The material of column inclusion enclave is flexible polyurethane material.
3. measuring the device of coal column gas permeability in similarity simulation experiment according to claim 1, it is characterised in that: the coal
Column inclusion enclave size is accordingly chosen according to the actual size for the coal column simulated；Coal column inclusion enclave pass through respectively air inlet and
Gas outlet connects high-pressure hose, is respectively equipped with screw thread in air inlet and air outlet, is connect by screw thread with high-pressure hose；It is described tight
It is fixedly mounted with and sets including screw rod, nut, screw rod passes through two blocks of rubber slabs being arranged before and after coal column inclusion enclave, is tightened with nut.
4. measuring the device of coal column gas permeability in similarity simulation experiment according to claim 1, it is characterised in that: when excavation
The value for carving coal rock layer moisture content C is 4% ~ 8%.
5. measuring the device of coal column gas permeability in similarity simulation experiment according to claim 1, it is characterised in that: experiment is logical
It crosses decompression valve regulation admission pressure P and obtains permeable sandstone rule of the coal column in certain stress state, different gas pressures.
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| CN109682736A (en) * | 2018-12-26 | 2019-04-26 | 河南理工大学 | A kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient |
| CN110879188B (en) * | 2019-11-28 | 2020-10-09 | 山东科技大学 | Movable rapid coal and rock permeability measuring instrument |
| CN114002411B (en) * | 2021-11-05 | 2023-07-21 | 中国矿业大学 | Dynamic monitoring system and method for water inflow of coal seam taking coal seam as main aquifer |
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