CN107449708A - A kind of method simulated polymorphic combination coalmass crevasse and barriering effect is moved to water transport - Google Patents
A kind of method simulated polymorphic combination coalmass crevasse and barriering effect is moved to water transport Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000000694 effects Effects 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 claims abstract description 53
- 239000002817 coal dust Substances 0.000 claims abstract description 16
- 238000003780 insertion Methods 0.000 claims abstract description 8
- 230000037431 insertion Effects 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 6
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 239000003245 coal Substances 0.000 claims description 38
- 238000009792 diffusion process Methods 0.000 claims description 32
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000002474 experimental method Methods 0.000 claims description 11
- 238000004088 simulation Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 9
- 230000000007 visual effect Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 4
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- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000003643 water by type Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000011160 research Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000013508 migration Methods 0.000 description 4
- 230000005012 migration Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
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Abstract
The invention discloses a kind of method simulated polymorphic combination coalmass crevasse and barriering effect is moved to water transport, comprise the following steps：（1）Mold Making：Cube structure mould is made, mould upper and lower opening opens wide, and makes two pieces of the bottom plate matched with die size,（2）Prefabricated crack makes：Prefabricated crack is fixed on mould inside on disk groove Interal fixation, the coal dust being stirred is put into mould；Using bottom plate a, different angle, different in width, insertion or non-penetrating single crack can be obtained；Using bottom plate b, different crack combinations can be obtained；（3）Test specimen seals；（4）Water filling：In test piece upper part placement and test specimen floor space identical sponge, red ink is injected into sponge；（5）High-speed camera records：By gather way common observation, the record of water in high-speed camera and 500ml measuring cups, compare different shape, the barriering effect that various combination crack is moved to water transport.Preparation method of the present invention is easy, easy to operation.
Description
Technical field
The present invention relates to a kind of method simulated polymorphic combination coalmass crevasse and barriering effect is moved to water transport, main research exists
The method of the barriering effect moved under conditions of prefabricated different shape crack, various combination crack to water transport.
Background technology
During coal production, preventing and treating water problems is a big technical barrier of production and scientific research.In recent years, water leak accident
Caused by death toll sharply increase, so research coal seam water bearing features and migration rule be particularly important.In coal seam
In, the main thoroughfare that water transport moves is crack and tomography.Coal develops into as a kind of inhomogeneous concrete dynamic modulus body, its internal crack
It is ripe, and fractured zones are sufficiently complex, due to the presence in crack so that the flow direction of coal seam reclaimed water, flow are very big
Depending on the distribution arrangement in crack, geometric shape, syntagmatic in degree.In process of production, the influence that crack is stressed, no
Disconnected extension and densification, at this moment the transport conditions of water can also change, when crack propagation to a certain extent, the flowing of water can be from layer
Rheology is turbulent flow, when neighbouring preservation has water-bearing layer, will shove, cause the generation of water inrush accident.So research water is in coal
Transport conditions in slabbing gap are very necessary.
Paper that Luo Rongwu is delivered " mechanics parameter and its Experimental Study on Seepage Characteristics research of preset crack test specimen " (2009, in
Southern university pages 89) in, longitudinal prefabricated crack seepage tests method is employed, crack is in non-filler, breakthrough status, pressure
For power water by test specimen upper surface prefabricated crack seepage flow, the method that lower surface communicates with air studies seepage flow of the water in crack,
But its migration pathway using crack as water, and the iris action that research crack in prefabrication transverse crack is moved to water transport in coal sample
Study less.
The Chinese invention patent of Application No. 201610574945.3 describes one kind and intersected for fluid in fine and close rock mass
The simulation densification rock mass of seepage flow mechanism research in crack intersects crack permeation flow tester, but it uses rock sample, and
It is rarely reported in coal test specimen in the research of prefabricated crack.
In coal test specimen transverse direction prefabricated crack, longitudinal seepage flow, different shape, migration of the crack of various combination to water have one
Fixed iris action, so prefabricated different shape, the crack of various combination are to the barrier situation that water transport moves in the horizontal for research
Very necessary, this can prevent and treat for colliery water leak accident and provide important scientific basis.
The content of the invention
The present invention is intended to provide a kind of method simulated polymorphic combination coalmass crevasse and barriering effect is moved to water transport, making
Prefabricated crack test specimen observes the barriering effect that different crack forms, crack combination are moved to water transport well.
Method of the polymorphic combination coalmass crevasse to water transport shifting barriering effect is simulated the invention provides a kind of, including it is following
Step：
(1) Mold Making：Die size is fabricated to 100mm × 100mm × 100mm as needed, and mould upper and lower opening opens wide,
Make the 100mm × 100mm matched with die size two pieces of bottom plate, bottom plate thickness 10mm；Bottom plate a has using bottom plate center m as circle
The circular opening of the heart, a diameter of 50mm；Bottom plate b has respectively with point n1,n2For the center of circle, a diameter of 50mm two circular openings, its
Middle n1、n2For the center of circle of two tangent circles on the center line of bottom plate；The circle matched with its size is provided with above-mentioned circular opening
Disk, disk can be embedded on circular opening, have scale on disk and can rotate freely, original state disk is located at 0 ° of angle；Disk edge
Diametric(al) is provided with groove；Can be respectively in 0.5mm, 1mm, 1.5mm steel plate insertion groove by thickness.
(2) prefabricated crack makes：Prefabricated crack is fixed on mould inside on disk groove Interal fixation, then will
Original coal sample crushes, and sieve takes the coal dust that granularity is 0.2-0.25mm；Distilled water is added into coal dust, and (moulded coal test specimen made of making contains
Water rate stirs up to 2%)；The coal dust being stirred is put into mould；Using the mould equipped with bottom plate a, rotating circular disk,
Disc angle is set to distinguish 0 °, 30 °, 60 °, 90 °；The development degree of different configuration position cracks in coal seam is also different within coal mines, pleat
Position fracture density of wrinkling is big, and length and height are relatively large, especially anticline axle portion, and Fracture Width maximum reaches 0.28-
1.4mm, so it is 100mm to choose length, thickness is respectively 0.5mm, 1mm, 1.5mm steel plate to change the thickness of prefabricated crack
Degree；By choose length be 50mm steel plate, to form intermittent fracture, to simulate different angle, different in width, insertion or
Non-penetrating single crack；Using the mould equipped with bottom plate b, two disks are rotated, two prefabricated cracks is in parallel, junction
Geometry site, to simulate different crack combinations.It is made on 200t stiff experiment machines with 100MPa pressure
100mm × 100mm × 100mm standard moulded coal test specimen.Using orthogonal design, reduce and repeat experimental group number, 16 groups of test specimen is made.
(3) test specimen seals：Test specimen is overturn, is horizontally oriented prefabricated crack, then by vertical with horizontal direction four
Individual plane covers layer of transparent heat-shrink tube, is heated using heat gun, shrinks heat-shrink tube, sealed test piece, avoids water from side seepage flow.
It is placed in after coal sample is weighed in the big 6mm of inside dimension side ratio test specimen container, test specimen can be made to wrap heat-shrink tube and be just put into
Container.Container bottom is porous disc, and is connected to 500ml measuring cups.
(4) water filling：Placed in test piece upper part with test specimen floor space identical sponge, the injection 500ml red ink into sponge
Water, it is nature seepage flow when serving as water source using sponge, in many practical problems, big rimala staggeredly occurs, and more by fine grained
Medium is filled, and making the flowing of underground water, on the whole very slowly substantially conforming to Darcy's law, this method can regard water as and exist
Diffusion motion in micropore and dead end hole, when water is from moistening stronger region to moistening the poor and less region of curvature
When making diffusion motion, diffusion motion is one-dimensional, is represented by the following formula：
In formula, △ MkFor the increment of moisture in coal after diffusion；
D is diffusion coefficient；
X is liquid along capillariomotor distance；
T is the time.
If the time is that i.e. t=0 is counted since diffusion process, and on the region discussed and the border of liquid diffusion source
The moisture increment of (such as on prefabricated crack border) is possible maximum i.e. X=0, initial and boundary condition is substituted into above formula, then
It is available to make the moisture incrementss in coal sample be by molecule diffusion motion：
In formula, a within preset time because what molecule diffusion motion made that the increase of moisture in micropore fills hole is
Number, is obtained, it is relevant with the property of capillary, liquid by experiment；R is capillary radius.
It is 25 DEG C to control temperature, places 2d.
(5) high-speed camera records：Visual window is installed additional in container side, is observed using high-speed camera by visual window red
Diffusion motion of the ink in test specimen, water in suspension time of the globule of prefabricated crack upper surface, 500ml measuring cups is recorded in real time
Gather way, to the barriering effect for comparing different shape, various combination prefabricated crack moves to water transport.
Above-mentioned analogy method, die bottom plate can be embedded in disk in the step (1), have scale on disk and can freely revolve
Turn, disk is diametrically provided with groove, and the steel plate of different-thickness can be inserted in groove.
In the step (2), using the mould equipped with bottom plate a, rotating circular disk, make disc angle be respectively 0 °, 30 °,
60°、90°；Selection length is 100mm, and thickness is respectively 0.5mm, 1mm, 1.5mm steel plate to change the thickness of prefabricated crack；
The steel plate that length is 50mm is chosen, to form intermittent fracture, to simulate different angle, different in width, insertion or non-penetrating
Single crack；
Using the mould equipped with bottom plate b, two disks are rotated, two prefabricated cracks is in parallel, junction geometry position
Relation is put, to simulate different crack combinations.
It is to the method for test specimen sealing in the step (3)：Using transparent heat-shrink tube, it is placed in container, test specimen and container
It is brought into close contact.
In the step (3), the lower vessel portion has porous disc, is connected to 500ml measuring cups below porous disc, records water
Collection situation.
In step (4) the injecting process, by sponge water filling, water is set uniformly to be spread since test specimen upper surface.
In the step (4), by injecting red ink, diffusion motion of the water in test specimen can be observed at any time.
In the step (5), by gather way common observation, the record of water in high-speed camera and 500ml measuring cups,
Compare different shape, the barriering effect that various combination crack is moved to water transport.
Beneficial effects of the present invention：
A kind of physical analogy side for simulating the barriering effect that polymorphic combination coalmass crevasse moves to water transport provided by the invention
Method, the preparation method of prefabricated crack is easy, easy to operate, uses the simple and effective crack that observes of high-speed camera and measuring cup
Iris action of the boundary effect to water.
Brief description of the drawings
Fig. 1 is the structural representation of the mould equipped with bottom plate a.
Fig. 2 is the structural representation of the mould equipped with bottom plate b.
Fig. 3 is the schematic diagram of 0 °, 30 °, 60 °, 90 ° prefabricated crack of different angle.
Fig. 4 is the schematic diagram of various combination prefabricated crack (parallel, junction).
Fig. 5 is that the inventive method tests schematic diagram.
Wherein 1- steel plates, 2- disks, 3- moulds, 4- grooves, 5- porous discs, 6- containers, 7-500ml measuring cups, 8- sponges, 9-
Visual window, 10- prefabricated cracks.
Embodiment
The present invention is further illustrated below by embodiment, but is not limited to following examples.
Embodiment 1：
Fig. 1, mould described in 2 structural representation in, wherein 1 is steel plate, 2 be disk, and 3 be mould, and 4 be groove, steel
It is respectively that 0.5mm, 1mm, 1.5mm, 3 groups of length × a width of 100mm × 50mm and thickness are respectively that the specifications parameter of plate, which has thickness,
3 groups of 0.5mm, 1mm, 1.5mm, length × a width of 50mm × 50mm, totally 6 groups；Mould is mainly opened wide by upper and lower opening, and size is
The length that 100mm × 100mm × 100mm framework matches with same frame size × a width of 100mm × 100mm, thickness are 10mm's
Two pieces of bottom plate a, b assembles respectively；Offered in Fig. 1 on bottom plate using bottom plate center m as the center of circle, a diameter of 50mm circle
Hole, and be respectively 0.5mm, 1mm, 1.5mm, a diameter of 50mm 1 group of disk equipped with recess width；Bottom plate b is opened up in fig. 2
Have with n1,n2For the center of circle, a diameter of 50mm two circular openings, wherein n1、n2It is tangent for two on the center line of bottom plate
The round center of circle；And it is furnished with 2 groups of the disk that recess width is respectively 0.5mm, 1mm, 1.5mm, a diameter of 50mm.
In the schematic diagram of 0 °, 30 °, 60 °, 90 ° prefabricated crack of different angle described in Fig. 3, the making side of 0 ° of prefabricated crack
Method is to make Interal fixation on disk groove prefabricated crack 1 to be fixed on mould inside, and rotating circular disk, it is 0 ° to make disc angle,
Then original coal sample is crushed, sieve takes the coal dust that granularity is 0.2-0.25mm.27ml distilled water is added into coal dust, and is stirred equal
It is even.The coal dust being stirred is put into mould, 100mm × 100mm is made with 100MPa pressure on 200t stiff experiment machines
× 100mm 0 ° of prefabricated crack moulded coal test specimen.30 °, 60 °, 90 ° of prefabricated crack moulded coal test specimens pass through rotating circular disk angle, repeat
Above-mentioned steps, you can be made.
In the schematic diagram of various combination prefabricated crack described in Fig. 4, the geometry site of two groups of prefabricated cracks is respectively
Parallel and junction, it can be realized by using the mould equipped with bottom plate b, rotating circular disk, be respectively at two groups of steel plates parallel
With the position of junction, original coal sample is crushed, sieve takes the coal dust that granularity is 0.2-0.25mm.27ml distillations are added into coal dust
Water, and stir.The coal dust being stirred is put into mould, is made on 200t stiff experiment machines with 100MPa pressure
100mm × 100mm × 100mm various combination prefabricated crack moulded coal test specimen.
In the inventive method experiment schematic diagram described in Fig. 5, wherein 5 be porous disc, 6 be container, and 7 be 500ml measuring cups, 8
It is sponge, 9 be visual window, and 10 be prefabricated crack.Container is put into after prefabricated crack moulded coal test specimen is sealed by transparent heat-shrink tube,
Sponge is placed in test piece upper part, 500ml red ink is injected into sponge, red ink diffuses to container bottom in test specimen, leads to
Cross container bottom porous disc and flow into 500ml measuring cups.Recorded in real time from visual window using high-speed camera during experiment prefabricated
The increased speed of water in suspension time of the globule of crack upper surface, 500ml measuring cups, observation red ink is in prefabricated crack moulded coal
Diffusion motion in test specimen.It is 25 DEG C to control room temperature, test period 2d.
The method that barriering effect is moved to water transport using the polymorphic combination coalmass crevasse of present invention simulation, specifically includes following step
Suddenly：
(1) Mold Making：As illustrated in fig. 1 and 2, die size is fabricated to 100mm × 100mm × 100mm, mould as needed
Have 3 upper and lower openings to open wide, make the 100mm × 100mm matched with die size two pieces of bottom plate, bottom plate thickness 10mm；Bottom plate a have with
Bottom plate center m is the center of circle, a diameter of 50mm circular opening, and bottom plate b has with n1,n2For the center of circle, a diameter of 50mm two circles
Hole, wherein n1、n2For the center of circle of two tangent circles on the center line of bottom plate；Separately there is the circle matched with circular opening size
Disk 2, disk 2 can be embedded on circular opening, have scale on disk 2 and can rotate freely, initial disk is located at 0 ° of angle.Disk is along directly
Footpath direction fluted 4.Can be respectively that 0.5mm, 1mm, 1.5mm steel plate 1 is inserted in groove 4 by thickness.
(2) prefabricated crack makes：Steel plate 1, which is fixed on disk groove 4, makes prefabricated crack 10 be fixed on inside mould 3,
Then original coal sample is crushed, sieve takes the coal dust that granularity is 0.2-0.25mm.Appropriate distilled water is added into coal dust, and is stirred equal
It is even.The coal dust being stirred is put into mould.Using the mould equipped with bottom plate a, rotating circular disk, make disc angle distinguish 0 °,
30°、60°、90°；The development degree of different configuration position cracks in coal seam is also different within coal mines, and fold position fracture density is big,
Length and height are relatively large, especially anticline axle portion, and Fracture Width is maximum up to 0.28-1.4mm, so selection length is
100mm, thickness are respectively 0.5mm, 1mm, 1.5mm steel plate to change the thickness of prefabricated crack；It is 50mm by choosing length
Steel plate, penetrated with forming crack half, to simulate different angle, different in width, insertion or non-penetrating single crack；Use
Mould equipped with bottom plate b, two disks are rotated, two prefabricated cracks is in parallel, junction geometry site, to mould
Intend different crack combinations.100mm × 100mm × 100mm mark is made with 100MPa pressure on 200t stiff experiment machines
Pseudotype coal test specimen.Using orthogonal design, reduce and repeat experimental group number, 16 groups of sample is made.
(3) sample seals：Sample is overturn, is horizontally oriented prefabricated crack, then by vertical with horizontal direction four
Individual plane covers layer of transparent heat-shrink tube, is heated using heat gun, shrinks heat-shrink tube, seals sample, avoids water from side seepage flow.
It is placed in after coal sample is weighed in the big 6mm of inside dimension side ratio sample container 6, sample can be made to wrap heat-shrink tube and be just put into
Container.Container bottom is porous disc 5, and is connected to 500ml measuring cups 7.
(4) water filling：Placed on sample top with sample floor space identical sponge 8, the injection 55.81ml into sponge 8
Red ink, it is nature seepage flow, in being inscribed between many reality, big rimala staggeredly occurs, and more thin when serving as water source using sponge
Granule medium is filled, and making the flowing of underground water, on the whole very slowly substantially conforming to Darcy's law, this method can be seen as
Diffusion motion of the water in micropore and dead end hole, when water is poor and curvature is less to moistening from moistening stronger region
When diffusion motion is made in region, diffusion motion is one-dimensional, is represented by the following formula：
In formula
△MkFor the increment of moisture in coal after diffusion；
D is diffusion coefficient；
X is liquid along capillariomotor distance；
T is the time.
If the time is that i.e. t=0 is counted since diffusion process, and on the region discussed and the border of liquid diffusion source
The moisture increment of (such as on prefabricated crack border) is possible maximum i.e. X=0, initial and boundary condition is substituted into above formula, then
It is available to make the moisture incrementss in coal sample be by molecule diffusion motion：
A within preset time because molecule diffusion motion makes the increase of moisture in micropore fill the coefficient of hole, by
Experiment obtains, and it is relevant with the property of capillary, liquid；R is capillary radius.
It is 25 DEG C to control room temperature, places 2d.
(5) high-speed camera records：Visual window 9 is installed additional in container side, is observed using high-speed camera by visual window
The diffusion motion of red ink in the sample, suspension time, the 500ml measuring cup reclaimed waters of the globule of prefabricated crack upper surface are recorded in real time
Increased situation is measured, to the barriering effect for comparing different shape, various combination prefabricated crack moves to water transport.
Summarize above-mentioned specific implementation method, prefabricated crack moulded coal test specimen preparation method provided by the invention and existing method phase
Than, take rotating circular disk angle, using the mould equipped with bottom plate b, change different-thickness steel plate, using length × a width of 50mm ×
The measures such as 50mm steel plate, it can obtain containing different angle, different in width, insertion or non-penetrating single crack and different cracks
The test specimen of combination.The test method of the present invention realizes test specimen compared with existing experiment, by using red ink and high-speed camera
The visualization of reclaimed water diffusion motion, available for the migration rule for analyzing different prefabricated crack test specimen reclaimed waters；Examination of the present invention
Proved recipe method can realize the effective simulation for the barriering effect that polymorphic combination coalmass crevasse moves to water transport, be recorded by high-speed camera
Suspension time of the globule of prefabricated crack upper surface, the data that water gathers way in 500ml measuring cups, can be to than less
The barriering effect that same form, various combination prefabricated crack move to water transport, important scientific basis is provided for the preventing and treating of colliery water leak accident.
Claims (9)
- A kind of 1. method simulated polymorphic combination coalmass crevasse and barriering effect is moved to water transport, it is characterised in that including following step Suddenly：(1) Mold Making：The mould of cube structure is made, mould upper and lower opening opens wide, two pieces of the bottom plate that making matches with die size, on bottom plate a Have using bottom plate center m as the center of circle, a diameter of 50mm circular opening, bottom plate b has respectively with point n1,n2For the center of circle, a diameter of 50mm Two circular openings, wherein n1、n2For the center of circle of two tangent circles on the center line of bottom plate；It is provided with circular opening The disk of size matching, has scale on disk and can rotate freely, original state disk is located at 0 ° of angle；(2) prefabricated crack makes：Prefabricated crack is set to be fixed on mould inside on disk groove Interal fixation, then will be original Coal sample crushes, and sieve takes the coal dust that granularity is 0.2-0.25mm；Distilled water is added into coal dust, makes manufactured moulded coal test specimen moisture content Up to 2%, and stir；The coal dust being stirred is put into mould；Using bottom plate a, can obtain different angle, different in width, Insertion or non-penetrating single crack；Using bottom plate b, different crack combinations can be obtained；100mm × 100mm × 100mm standard moulded coal test specimen is made with 100MPa pressure on 200t stiff experiment machines；Adopt With orthogonal design, reduce and repeat experimental group number, 16 groups of test specimen is made；(3) test specimen seals：Test specimen is overturn, is horizontally oriented prefabricated crack, it is then flat by four vertical with horizontal direction Surface cover layer of transparent heat-shrink tube, is heated using heat gun, shrinks heat-shrink tube, sealed test piece, avoids water from side seepage flow；By coal Sample is placed in container after weighing, and container bottom is porous disc；(4) water filling：In test piece upper part placement and test specimen floor space identical sponge, red ink is injected into sponge, uses sponge It is nature seepage flow when serving as water source；The diffusion motion of water is one-dimensional, is represented by the following formula：<mrow> <mo>&part;</mo> <msub> <mi>&Delta;M</mi> <mi>k</mi> </msub> <mo>/</mo> <mo>&part;</mo> <mi>t</mi> <mo>=</mo> <mo>&part;</mo> <mrow> <mo>(</mo> <mi>D</mi> <mo>&part;</mo> <msub> <mi>M</mi> <mi>k</mi> </msub> <mo>/</mo> <mo>&part;</mo> <mi>X</mi> <mo>)</mo> </mrow> <mo>/</mo> <mo>&part;</mo> <mi>t</mi> </mrow>In formula, △ MkFor the increment of moisture in coal after diffusion；D is diffusion coefficient；X is liquid along capillariomotor distance；T is the time；If the time is that i.e. t=0 is counted since diffusion process, and in the region discussed and the water on the border of liquid diffusion source It is possible maximum i.e. X=0 to divide increment, and initial and boundary condition is substituted into above formula, obtains making coal sample by molecule diffusion motion Middle moisture incrementss are：<mrow> <msub> <mi>M</mi> <mi>k</mi> </msub> <mo>=</mo> <msup> <mi>a&pi;r</mi> <mn>2</mn> </msup> <mi>X</mi> <mo>=</mo> <msup> <mi>a&pi;r</mi> <mn>2</mn> </msup> <msub> <mi>&alpha;</mi> <mi>k</mi> </msub> <msqrt> <mi>t</mi> </msqrt> </mrow>In formula, a within preset time because molecule diffusion motion makes the increase of moisture in micropore fill the coefficient of hole, by Experiment obtains, and it is relevant with the property of capillary, liquid；R is capillary radius；It is 25 DEG C to control temperature, places 2d；(5) high-speed camera records：Visual window is installed additional in one vertical plane of container, is observed using high-speed camera by visual window Diffusion motion of the red ink in test specimen, suspension time, the 500ml measuring cup reclaimed waters of the globule of prefabricated crack upper surface are recorded in real time Amount gathers way, to the barriering effect for comparing different shape, various combination prefabricated crack moves to water transport.
- 2. the method that the polymorphic combination coalmass crevasse of simulation according to claim 1 moves barriering effect to water transport, its feature It is：The circular opening of die bottom plate can be embedded in disk in the step (1), and disk is diametrically provided with groove, different thick The steel plate of degree can be inserted in groove.
- 3. the method that the polymorphic combination coalmass crevasse of simulation according to claim 2 moves barriering effect to water transport, its feature It is：The steel plate of the different-thickness refers to that thickness is respectively 0.5mm, 1mm, 1.5mm steel plate.
- 4. the method that the polymorphic combination coalmass crevasse of simulation according to claim 1 moves barriering effect to water transport, its feature It is：The die size is fabricated to 100mm × 100mm × 100mm, 100mm × 100mm's that making matches with die size Two pieces of bottom plate, bottom plate thickness 10mm.
- 5. the method that the polymorphic combination coalmass crevasse of simulation according to claim 1 moves barriering effect to water transport, its feature It is：In the step (2), using the mould equipped with bottom plate a, rotating circular disk, disc angle is set to distinguish 0 °, 30 °, 60 °, 90 °； Selection length is 100mm, and thickness is respectively 0.5mm, 1mm, 1.5mm steel plate to change the thickness of prefabricated crack；Choose length For 50mm steel plate, to form intermittent fracture, to simulate different angle, different in width, insertion or non-penetrating single split Gap；Using the mould equipped with bottom plate b, two disks are rotated, two prefabricated cracks is in parallel, junction geometric position pass System, to simulate different crack combinations.
- 6. the method that the polymorphic combination coalmass crevasse of simulation according to claim 1 moves barriering effect to water transport, its feature It is：In the step (3), the inside dimension big 6mm of side ratio test specimen of container is chosen, test specimen is wrapped heat-shrink tube and is just put into Container；The lower vessel portion has porous disc, is connected to 500ml measuring cups below porous disc, records the collection situation of water.
- 7. the method that the polymorphic combination coalmass crevasse of simulation according to claim 1 moves barriering effect to water transport, its feature It is：In the step (3), the method to test specimen sealing is：Using transparent heat-shrink tube, it is placed in container, test specimen is tight with container Closely connected conjunction.
- 8. the method that the polymorphic combination coalmass crevasse of simulation according to claim 1 moves barriering effect to water transport, its feature It is：In step (4) the injecting process, by sponge water filling, water is set uniformly to be spread since test specimen upper surface；Pass through injection Red ink, diffusion motion of the water in test specimen can be observed at any time.
- 9. the method that the polymorphic combination coalmass crevasse of simulation according to claim 1 moves barriering effect to water transport, its feature It is：In the step (5), by gather way common observation, the record of water in high-speed camera and 500ml measuring cups, than The barriering effect moved compared with different shape, various combination crack to water transport.
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