CN109655392A - A kind of break up coal rock sample visualization servo loading Seepage Experiment test method - Google Patents
A kind of break up coal rock sample visualization servo loading Seepage Experiment test method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 100
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- 239000007788 liquid Substances 0.000 claims abstract description 43
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- 230000035699 permeability Effects 0.000 claims abstract description 24
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- 239000002245 particle Substances 0.000 claims abstract description 10
- 238000005065 mining Methods 0.000 claims abstract description 6
- 230000003204 osmotic effect Effects 0.000 claims abstract description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 26
- 239000012530 fluid Substances 0.000 claims description 15
- 238000004458 analytical method Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
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- 230000032258 transport Effects 0.000 claims description 4
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- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims 1
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- 238000005259 measurement Methods 0.000 abstract description 13
- 238000013401 experimental design Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
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- 238000005452 bending Methods 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 238000007254 oxidation reaction Methods 0.000 description 1
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- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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- 239000002352 surface water Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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- G—PHYSICS
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- 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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- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses a kind of break up coal rock samples to visualize servo loading Seepage Experiment test method, for carrying out pore structure variation and the test of seepage flow evolution Feature in the fractured coal and rock compacting process of coal mining goaf, while the pore structure of fractured coal and rock can be constructed.Test method process specifically: (1) select the break up coal rock sample of appropriate particle size to be placed in the transparent autoclave body of visualization according to experimental design；(2) actual measurement goaf caving zone is compacted stress, and design break up coal rock sample laboratory adds unloading stress paths；(3) unloading stress paths are added to carry out the load of break up coal rock sample according to design；(4) every to increase specified stress during stress loading, it is tested using the permeability that full-automatic gas-liquid osmotic system carries out gas or liquid；(5) CT scan is carried out in the case where compacting stress reaches specified stress respectively during loading.Finally obtain pore structure variation and seepage flow evolution Feature in the fractured coal and rock compacting process of goaf.
Description
Technical field
The present invention, which relates to, belongs to fractured coal and rock pore structure and seepage flow spy in the closed goaf caving zone compacting process in coal seam
The test equipment and method of sign, and in particular to a kind of break up coal rock sample stress-is broken-measurement method of seepage flow coupling feature, especially
It is a kind of break up coal rock sample visualization servo loading Seepage Experiment test method.
Background technique
Overlying rock can generally be divided into " three bands " during seam mining, be followed successively by caving zone from the bottom to top, through splitting
Gap band and bending underlying band (warp damage generally comprises bedseparated fissures band and bending deformation band).Goaf caving zone is general
The overburden failure caused by digging up mine and the rock stratum band being caving to goaf, also known as caving zone, survey its hole according to laboratory
Gap rate is up to 30%~45%.Since caving zone porosity is high, permeability is big, adjacent coal seam gas pressure relief, water-bearing layer or earth's surface
Water, which pours in goaf, makes it contain a large amount of gas and water resource.And goaf caving zone seepage flow characteristics not only influence dampening and
The efficient methane drainage and utilization project of gas resources has an effect on residual oxidation of coal spontaneous combustion, threatens the safety in production of working face.In addition to this,
The permeation fluid mechanics property of goaf caving zone also with subsidence, greenhouse gases underground storage, groundwater reservoir construction, water resource mistake
Filter etc. is closely related.Therefore, the temporal-spatial evolution relationship for accurately grasping goaf caving zone seepage flow characteristics is efficient to safety of coal mines
The utilizations of resources, the environmental and ecological protections such as production, goaf water gas etc. have great importance.However goaf caving zone due to
Comprising a large amount of toxic and harmful gas and water resource, it is typically in closed state, is difficult to carry out the hole in caving zone compacting process
Structure and permeability actual measurement.
Summary of the invention
The purpose of the present invention is being directed to prior art, designs a set of break up coal rock sample visualization servo and add
It carries seepage flow experiment system and gives corresponding test method, to realize the pore structure and permeability in caving zone compacting process
Actual measurement.This method is simple and practical, safe and efficient, feasibility is high, accuracy is high, functional.
A kind of break up coal rock sample of the invention visualizes servo loading Seepage Experiment test method, uses: break up coal rock sample
Servo loading seepage flow experiment system is visualized, the break up coal rock sample visualization servo loading seepage flow experiment system includes: visual
Change transparent autoclave body, Full automatic servo loading device, Microfocus X-ray CT scanner, high-speed camera, full-automatic gas-liquid osmotic system with
And gas-liquid automatically switches flowmeter.Test method mainly includes the actual measurement of compacting stress path, the preparation of break up coal rock sample, stress test
Point selection, CT scan, permeability test, high-speed camera shooting, the mutual cooperation between pore structure reconstruct and each method,
Realize goaf caving zone break up coal rock sample stress-it is broken-actual measurement of seepage flow coupling feature, the break up coal rock sample visualization watches
Clothes load Seepage Experiment test method includes the following steps:
A, in coal mining goaf, arrangement borehole stressmeter surveys goaf stress Evolution, and progress laboratory, which adds, unloads
Carry the design of stress path；
B, break up coal sillar is directly chosen in goaf caving zone, transports laboratory back and is machined to the broken of different-grain diameter size
Coal petrography sample, wherein the largest particles partial size, which is not more than, visualizes the 1/5 of transparent autoclave body diameter；
C, break up coal rock sample is placed sequentially in transparent autoclave body in lower rock sample upper according to coal sample, is measured after shaking up broken
Coal petrography sample height；
D, unloading stress paths are added according to design, break up coal rock sample is added using Full automatic servo loading device
It carries；
E, unloading stress paths are added according to design, stress path is divided into several stress points；Specially according to stress
Maximum and minimum stress value in path are divided into 5 stress points.3 stress are inserted between the 1st and the 2nd stress point
Point is inserted into 2 stress points between the 2nd and the 3rd stress point, and 1 stress point is inserted between the 3rd and the 4th stress point,
Therefore 11 stress points altogether will be minimal to maximum stress path and be divided into 10 stage of stress and measure.
F, when each stage of stress is loaded onto specified stress point, break up coal rock sample hole is carried out with Microfocus X-ray CT scanner
The CT scan of gap cataclasitlc structure；Specially when stress reaches above-mentioned each stress point, upstream valve and valve downstream are closed, will be set
Standby Upstream Interface and downstream interface disconnect.CT scan voxel controls the end effect shadow at 100 microns, when in order to avoid load
Ring, each CT scan at the top of the test specimen slightly under the position of about 5.0mm start, broken coal petrography sample is divided into 1000 from top to bottom
A scanning slice, image resolution ratio are 1024 × 1024 pixels.
G, after CT scan, the test of break up coal rock sample permeability is carried out；Permeability test is divided into Test Liquid Permeability of Core
Test and measuring gas permebility: the specific steps of Test Liquid Permeability of Core test are as follows: suitable liquid pump is selected, by liquid pump interface
It is connect with autoclave body Upstream Interface；It is hydraulic to specifying to adjust hydraulic pump pressure regulator valve.Gas flowmeter valve is closed, fluid flow is opened
Count valve, valve downstream and upstream valve；Hydraulic pump valve is finally opened until being flowed after fluid flowmeter stable reading
The record of amount.The specific operating procedure of measuring gas permebility are as follows: choice experiment gas source connects gas source interface and Upstream Interface
It connects；Bleed pressure valve is adjusted to specified air pressure.Closing liquid flowmeter valve, open gas flowmeter valve, valve downstream with
And upstream valve；Finally gas source valve is opened until carrying out the record of flow after gas flowmeter stable reading.It is remained in equipment
Liquid can then be filtered out by the liquid filter before gas flowmeter.
H, it in whole experiment process, is shot with compacting shattering process of the high speed camera to break up coal rock sample；
I, after the end of the experiment, using Avizo three-dimensional visualization and application software for XRF analysis to the CT under different stress
Scanned picture carries out Pore Fractal Dimension, the quantitative description of Particle Breakage, and carries out visualization of 3 d reconstruct；Schemed simultaneously using ImageJ
As processing software handles high-speed camera picture, three-dimensionalreconstruction model is further corrected.Finally obtain goaf
Pore structure variation and seepage flow evolution Feature in fractured coal and rock compacting process.
It is answered the utility model has the advantages that can be realized break up coal rock sample in closed goaf caving zone compacting process using the above method
Power-is broken-the safe and efficient measurement of seepage flow coupling feature, and accurately grasp the temporal-spatial evolution of goaf caving zone seepage flow characteristics
The utilizations of resources, the environmental and ecological protections such as relationship efficiently produces safety of coal mines, goaf water gas etc. have great importance.
Detailed description of the invention
Fig. 1 is the schematic diagram for the break up coal rock sample visualization servo loading seepage flow experiment system that the present invention uses；
Fig. 2 is the design that the present invention uses plus unloading stress paths schematic diagrames.
In figure: the transparent autoclave body of 1- visualization, 2- break up coal rock sample, 3- Full automatic servo loading device, 4- Microfocus X-ray CT are swept
Retouch instrument, 5- high-speed camera, 6- gas source, 7- hydraulic pump, 8- hydraulic pump pressure regulator valve, 9- gas source pressure regulator valve, 10- prexxure of the hydraulic pump
Table, 11- cylinder pressure gauge, 12- fluid flowmeter, 13- gas flowmeter, the hydraulic pump valve of 14-, 15- gas source valve, 16- gas
Flowmeter body valve, 17- fluid flowmeter valve, 18- valve downstream, 19- downstream interface, 20- gas source interface, the upstream 21- connects
Mouthful, 22- gas-liquid automatic transfer valve, 23- liquid filter, 24- upstream valve, the hydraulic pump interface of 25-.
Specific embodiment
One embodiment of the present of invention is further described with reference to the accompanying drawing:
The present invention visualizes servo loading seepage flow experiment system using a set of break up coal rock sample, which specifically includes that can
Depending on changing transparent autoclave body 1 (using transparent resin material), Full automatic servo loading device 3, Microfocus X-ray CT scanner 4, high-speed camera
Machine 5, full-automatic gas source 6, hydraulic pump 7, cylinder pressure gauge 11, gas flowmeter 13, fluid flowmeter 12 are cut automatically by gas-liquid
Change the automatic switchover that valve 22 realizes gas-liquid seepage tests.Break up coal rock sample visualization servo loading Seepage Experiment test of the invention
Method mainly include compacting stress path actual measurement, the preparation of break up coal rock sample, stress test point selection, CT scan, permeability test,
High-speed camera shooting, the mutual cooperation between pore structure reconstruct and each method, realizes that goaf caving zone is crushed coal petrography
Sample stress-is broken-actual measurement of seepage flow coupling feature.
In coal mining goaf, arrangement borehole stressmeter surveys goaf stress Evolution, carries out laboratory and adds unloading
The design of stress path (for example, arranging pressure gauge in goaf caving zone, surveys caving zone in coal working face progradation
It is compacted the evolution Feature of stress at any time, adds unloading stress paths according to time equal proportion Design Laboratory later, is designed
Plus unloading stress paths, it is maximum according to actual measurement goaf as shown in Fig. 2, figure axis pressure is the compacting stress of goaf actual measurement
Compacting stress is 10MPa, and gas pressure is the size of field measurement goaf gas pressure, is 0.2MPa；Axis is pressed every 30 minutes
Increase is once that gas, there are suction-operateds due to fractured coal and rock, is found in an experiment at 30 minutes or so, gas flow
Balance can just be reached.Corresponding stress boost phase in Fig. 2 is goaf caving zone packing stage, and it is then right that stress reduces the stage
What is answered is release stage of the adjacent coal seam exploitation to caving zone)；In goaf, caving zone directly chooses break up coal sillar, transports reality back
The break up coal rock sample 2 that room is machined to different-grain diameter size is tested, wherein the largest particles partial size is no more than transparent 1 diameter of autoclave body of visualization
1/5 (according to rock-soil mechanics size classification index, when crushed particles partial size is less than the 1/5 of autoclave body diameter, experiment can be eliminated
Boundary effect in the process)；Break up coal rock sample 2 is placed sequentially in transparent autoclave body 1 in lower rock sample upper according to coal sample, is shaken up
Break up coal rock sample height is measured afterwards；According to design plus unloading stress paths (design plus unloading stress paths, i.e. loading stress
It is as shown in Figure 2 with the curve of time), break up coal rock sample is loaded using Full automatic servo loading device 3；By stress road
Diameter is divided into several stress points；Specially according in stress path maximum and minimum stress value be divided into 5 stress points.?
It is inserted into 3 stress points between 1st and the 2nd stress point, 2 stress points are inserted between the 2nd and the 3rd stress point, at the 3rd
1 stress point is inserted between the 4th stress point.Therefore, will be minimal to maximum stress path be divided into 10 stage of stress into
Row measurement.The CT scan of 2 hole cataclasitlc structure of break up coal rock sample is carried out with Microfocus X-ray CT scanner 4 in each stage of stress；
Specially when stress reaches some stress point, upstream valve 24 and valve downstream 19 are closed, by equipment Upstream Interface 18 under
Interface 19 is swum to disconnect.The end effect that CT scan voxel controls at 100 microns, when in order to avoid load influences, each CT scan
At the top of the test specimen slightly under the position of about 5.0mm start, broken coal petrography sample 2 is divided into 1000 scanning slices from top to bottom, is schemed
As resolution ratio is 1024 × 1024 pixels.After CT scan, the test of 2 permeability of break up coal rock sample is carried out；Permeability is surveyed
Examination is divided into Test Liquid Permeability of Core test and measuring gas permebility: the specific steps of Test Liquid Permeability of Core test are as follows: select suitable liquid
Hydraulic pump interface 25 is connect by press pump 7 with autoclave body Upstream Interface 19；It is hydraulic to specifying to adjust hydraulic pump pressure regulator valve 8.Close gas
Flowmeter valve 16 opens fluid flowmeter valve 17, valve downstream 18 and upstream valve 24；Finally open hydraulic pump valve
14 until carry out the record of flow after 12 stable reading of fluid flowmeter.The specific operating procedure of measuring gas permebility are as follows: choosing
Experiment gas source 6 is selected, gas source interface 20 is connect with Upstream Interface 21；Gas source pressure regulator valve 9 is adjusted to specified air pressure.Closing liquid stream
Meter valve 17 opens gas flowmeter valve 16, valve downstream 18 and upstream valve 24；It is straight finally to open gas source valve 15
The record of flow is carried out after to 13 stable reading of gas flowmeter.Before residual liquid then can be by gas flow device 13 in equipment
Liquid filter 23 filters out.In whole experiment process, with high speed camera 5 (speed of taking pictures is 2000 frames/second) to broken
The compacting shattering process of coal petrography sample 2 is shot；After the end of the experiment, Avizo three-dimensional visualization and application software for XRF analysis are utilized
Pore Fractal Dimension, the quantitative description of Particle Breakage are carried out to the CT scan picture under different stress, and carry out visualization of 3 d
Reconstruct；It is handled simultaneously using the picture that ImageJ image processing software shoots high-speed camera 5, to three-dimensionalreconstruction model
Further amendment.Finally obtain pore structure variation and seepage flow evolution Feature in the fractured coal and rock compacting process of goaf.It adopts
It can be realized break up coal rock sample stress-in closed goaf caving zone compacting process in aforementioned manners and be crushed-seepage flow coupling feature
Safe and efficient measurement, and the temporal-spatial evolution relationship for accurately grasping goaf caving zone seepage flow characteristics efficiently gives birth to safety of coal mines
The utilizations of resources, the environmental and ecological protections such as production, goaf water gas etc. have great importance.
As shown in Figure 1, break up coal rock sample visualization servo loading seepage flow experiment system component part specifically includes that visualization
Transparent autoclave body 1, Full automatic servo loading device 3, Microfocus X-ray CT scanner 4, high-speed camera 5, gas source 6, hydraulic pump 7 and
Gas flowmeter 13 and fluid flowmeter 12, gas-liquid automatic transfer valve 22 are automatically switched.Specific step is as follows for test method:
A, in coal mining goaf, arrangement borehole stressmeter surveys goaf stress Evolution, and progress laboratory, which adds, unloads
Carry the design of stress path；
B, break up coal sillar is directly chosen in goaf caving zone, transports laboratory back and is machined to the broken of different-grain diameter size
Coal petrography sample 2, wherein the largest particles partial size, which is not more than, visualizes the 1/5 of transparent 1 diameter of autoclave body；
C, break up coal rock sample 2 is placed sequentially in transparent autoclave body 1 in lower rock sample upper according to coal sample, is measured after shaking up broken
Broken coal rock sample height；
D, unloading stress paths are added according to design, break up coal rock sample 2 is added using Full automatic servo loading device 3
It carries；
E, unloading stress paths are added according to design, stress path is divided into several stress points；Specially according to stress
Maximum and minimum stress value in path are divided into 5 stress points.3 stress are inserted between the 1st and the 2nd stress point
Point is inserted into 2 stress points between the 2nd and the 3rd stress point, and 1 stress point is inserted between the 3rd and the 4th stress point.
Therefore, it maximum stress path will be minimal to is divided into 11 stage of stress and measure；
F, it is swept in each stage of stress with the CT that Microfocus X-ray CT scanner 4 carries out 2 hole cataclasitlc structure of break up coal rock sample
It retouches；Specially when stress reaches some stress point, upstream valve 24 and valve downstream 19 are closed, by 18 He of equipment Upstream Interface
Downstream interface 19 disconnects.The end effect that CT scan voxel controls at 100 microns, when in order to avoid load influences, and each CT is swept
The position of about 5.0mm starts under retouching at the top of the test specimen slightly, and broken coal petrography sample 2 is divided into 1000 scanning slices from top to bottom,
Image resolution ratio is 1024 × 1024 pixels；
G, after CT scan, the test of 2 permeability of break up coal rock sample is carried out；Permeability test is divided into Test Liquid Permeability of Core
Test and measuring gas permebility: the specific steps of Test Liquid Permeability of Core test are as follows: select suitable hydraulic pump 7, hydraulic pump is connect
Mouth 25 is connect with autoclave body Upstream Interface 19；It is hydraulic to specifying to adjust hydraulic pump pressure regulator valve 8.Gas flowmeter valve 16 is closed, is beaten
Open fluid flowmeter valve 17, valve downstream 18 and upstream valve 24；Hydraulic pump valve 14 is finally opened until fluid flow
Count the record that flow is carried out after 12 stable readings.The specific operating procedure of measuring gas permebility are as follows: choice experiment gas source 6, it will
Gas source interface 20 is connect with Upstream Interface 21；Gas source pressure regulator valve 9 is adjusted to specified air pressure.Closing liquid flowmeter valve 17, beats
Open gas flowmeter valve 16, valve downstream 18 and upstream valve 24；Finally gas source valve 15 is opened until gas flowmeter
The record of flow is carried out after 13 stable readings.Residual liquid then can be by 23 mistake of liquid filter before gas flowmeter in equipment
It filters.
H, it in whole experiment process, is shot with compacting shattering process of the high speed camera 5 to break up coal rock sample 2；
I, after the end of the experiment, using Avizo three-dimensional visualization and application software for XRF analysis to the CT under different stress
Scanned picture carries out Pore Fractal Dimension, the quantitative description of Particle Breakage, and carries out visualization of 3 d reconstruct；Schemed simultaneously using ImageJ
As processing software handles high-speed camera picture, three-dimensionalreconstruction model is further corrected.Finally obtain goaf
Pore structure variation and seepage flow evolution Feature in fractured coal and rock compacting process.
Wherein, during stress loading, in different stress points, the permeability test for carrying out gas or liquid is (specific
Tested in 11 points: be specially according in stress path maximum and minimum stress value be divided into 5 stress points, the
3 stress points can be averagely inserted between 1 and the 2nd stress point, it can averagely insertion 2 between the 2nd and the 3rd stress point
Stress point, equal part is inserted into 1 stress point between the 3rd and the 4th stress point, will be minimal to maximum stress path and is divided into 11
A stage of stress measures)；(full-automatic gas source 6, liquid are specifically included that for example, by using the full-automatic gas-liquid osmotic system in Fig. 1
Press pump 7, cylinder pressure gauge 11, gas flowmeter 13, fluid flowmeter 12, gas-liquid automatic transfer valve 22 and corresponding valve,
The components such as flowmeter, interface) the permeability test of gas or liquid is carried out, to realize automatic switchover；In addition, in loading procedure
It is middle to be compacted carry out CT scan when stress reaches 11 stress points respectively.The purpose specifically divided in this way is according to break up coal rock sample
It being easily varied in load Initial Crack structure, breaking feature is obvious, and with the raising of loading stress, pore structure amplitude of variation
Reduce；Therefore this 11 test points, which gradually become, dredges.
Certainly, described above is only that presently preferred embodiments of the present invention is answered the present invention is not limited to enumerate above-described embodiment
When explanation, anyone skilled in the art is all equivalent replacements for being made, bright under the introduction of this specification
Aobvious variant, all falls in the essential scope of this specification, ought to be by protection of the invention.
Claims (8)
1. a kind of break up coal rock sample visualizes servo loading Seepage Experiment test method, it is characterized in that, the break up coal rock sample can
Include the following steps: depending on changing servo loading Seepage Experiment test method
A, in coal mining goaf, arrangement borehole stressmeter surveys goaf stress Evolution, carries out laboratory and unloading is added to answer
The design of power path；
B, break up coal sillar is directly chosen in goaf caving zone, transports the broken coal petrography that laboratory is machined to different-grain diameter size back
Sample, wherein the largest particles partial size, which is not more than, visualizes the 1/5 of transparent autoclave body diameter；
C, by break up coal rock sample according to coal sample under, rock sample is placed sequentially in transparent autoclave body upper, measures break up coal after shaking up
Rock sample height；
D, unloading stress paths are added according to design, break up coal rock sample is loaded using Full automatic servo loading device；
E, unloading stress paths situation is added according to design, stress path is divided into several specified stress points；Specially according to
Maximum and minimum stress value in stress path are first divided into 5 level-ones and specify stress point, then in the 1st and the 2nd level-one
3 second levels of insertion specify stress point between specified stress point, specify in the 2nd and the 3rd level-one and are inserted into 2 second levels between stress point
Specified stress point specifies in the 3rd and the 4th level-one and is inserted into the specified stress point of 1 second level between stress point, and adjacent two two
The specified stress point of grade or adjacent level-one are specified between stress point and the specified stress point of second level or two adjacent level-ones
A stage of stress is formed between specified stress point, will be minimal to maximum stress path and is drawn and is divided into 10 stage of stress and surveys
Amount；
F, the CT scan of break up coal rock sample hole cataclasitlc structure is carried out when each stage of stress is loaded onto specified stress point；
G, after CT scan, the test of break up coal rock sample permeability is carried out；
H, it in whole experiment process, is shot with compacting shattering process of the high speed camera to break up coal rock sample；
I, Pore Fractal Dimension after the end of the experiment, is carried out to the CT scan picture under different stress using application software for XRF analysis,
The quantitative description of Particle Breakage, and carry out visualization of 3 d reconstruct；Simultaneously using image processing software to high-speed camera picture
It is handled, three-dimensionalreconstruction model is further corrected, finally obtain hole knot in the fractured coal and rock compacting process of goaf
Structure variation and seepage flow evolution Feature.
2. break up coal rock sample as described in claim 1 visualizes servo loading Seepage Experiment test method, which is characterized in that institute
State break up coal rock sample visualization servo loading Seepage Experiment method to use: break up coal rock sample visualizes servo loading Seepage Experiment system
System, the break up coal rock sample visualization servo loading seepage flow experiment system include: the transparent autoclave body of visualization, Full automatic servo load
Device, CT scanner, high-speed camera, full-automatic gas-liquid osmotic system.
3. break up coal rock sample as described in claim 1 visualizes servo loading Seepage Experiment test method, which is characterized in that institute
State step f specifically: when stress reaches some stress point, the upstream valve of autoclave body and the valve downstream of autoclave body are closed, by kettle
The Upstream Interface of body and the downstream interface of autoclave body disconnect.CT scan voxel controls the end at 100 microns, when in order to avoid load
Effects, each CT scan at the top of the test specimen slightly under the position of about 5.0mm start, broken coal petrography sample is divided from top to bottom
For 1000 scanning slices, image resolution ratio is 1024 × 1024 pixels.
4. break up coal rock sample as described in claim 1 visualizes servo loading Seepage Experiment test method, which is characterized in that institute
State step g specifically:
Permeability test is divided into Test Liquid Permeability of Core test and measuring gas permebility: the specific steps of Test Liquid Permeability of Core test are as follows:
Suitable liquid pump is selected, the Upstream Interface of liquid pump interface and autoclave body is connected；It is hydraulic to specifying to adjust hydraulic pump pressure regulator valve,
Gas flowmeter valve is closed, fluid flowmeter valve, valve downstream and upstream valve are opened；Finally open hydraulic pump valve
Until carrying out the record of flow after fluid flowmeter stable reading.
The specific operating procedure of measuring gas permebility are as follows: choice experiment gas source connects the Upstream Interface of gas source interface and autoclave body
It connects；Bleed pressure valve is adjusted to specified air pressure.Closing liquid flowmeter valve opens the downstream of gas flowmeter valve, autoclave body
The upstream valve of valve and autoclave body；Finally gas source valve is opened until carrying out the note of flow after gas flowmeter stable reading
Record.Residual liquid can then be filtered out by the liquid filter before gas flowmeter in equipment.
5. break up coal rock sample as described in claim 1 visualizes servo loading Seepage Experiment test method, which is characterized in that institute
Stating application software for XRF analysis is Avizo three-dimensional visualization and application software for XRF analysis.
6. break up coal rock sample as described in claim 1 visualizes servo loading Seepage Experiment test method, which is characterized in that institute
Stating image processing software is ImageJ image processing software.
7. break up coal rock sample as described in claim 1 visualizes servo loading Seepage Experiment test method, which is characterized in that institute
Stating full-automatic gas-liquid osmotic system includes: gas source bottle, hydraulic pump, gas flowmeter, fluid flowmeter, full-automatic gas-liquid switching valve
And liquid filter.
8. break up coal rock sample as described in claim 1 visualizes servo loading Seepage Experiment test method, which is characterized in that step
In rapid f, the CT scan of break up coal rock sample hole cataclasitlc structure is carried out with Microfocus X-ray CT scanner.
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| CN112461725B (en) * | 2019-09-09 | 2022-01-28 | 中国矿业大学(北京) | Seepage characteristic testing system and method for mining fractured rock |
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| CN115144318A (en) * | 2022-06-17 | 2022-10-04 | 长江大学 | Stress-seepage coupling measurement system based on acousto-optic combination |
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