CN106053169A - Test piece of coal seam simulation experiment using shock waves to increase permeability and experiment method based on test piece - Google Patents
Test piece of coal seam simulation experiment using shock waves to increase permeability and experiment method based on test piece Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention belongs to the technical field of coal seam physical simulation experiments and particularly relates to a test piece of a coal seam simulation experiment using shock waves to increase permeability and an experiment method based on the test piece. The quantitative relation between fluctuation parameters and the coal petrography cracking effect and permeability variation feature is built through the physical simulation experiment. The test piece comprises a shell, strain bricks and coal sample strain gauges, wherein the shell is a bottom-free rectangular shell, one strain brick is fixed in the middle of each of the faces, except the bottom, on the inner side of the shell, a coal sample is fixed in the shell, and two vertical coal sample strain gauges are fixed in the middle of each of the faces, except the bottom, of the coal sample, every two coal sample strain gauges are respectively fixed in the vertical direction and the horizontal direction, and each strain brick presses on the surfaces of the corresponding two coal sample strain gauges. The test piece has the advantages that the test piece is large in dimension, deformation features can be conveniently recorded during the experiment process, the crack development conditions can be statistically recorded during the experiment process, and cement mortar on the outer surface of the coal sample can simulate surrounding rock.
Description
Technical field
The invention belongs to coal seam physical simulation experiment technical field, a kind of shock wave anatonosis coal seam simulation experiment
Test specimen and the experimental technique completed based on it.
Background technology
China has abundant coal bed gas resource, development and utilization coal bed gas to have long-range prospect.But China coalfield
Geological conditions is more complicated, and coal seam reservoirs has the feature of " three low is high " more: reservoir pressure is low, reservoir permeability is low, conventional water
Defeating and split that to make seam proportion low, the absorbability of coal seam reservoirs is high.Therefore, restriction cbm development major technology bottleneck be as
The permeability in what raising coal seam, the anti-reflection and de-plugging anatonosis including fracturing.
Traditional coal seam gas yield-increasing technology many employings pressure break, slot and displacement etc., these measures achieve for specific region
Certain effect, but restricted by factors such as natural conditions, it is difficult to popularization and application.
High pulse power technology is one of support subject of contemporary new and high technology, and it stores energy in the way of slow, then
Realize pulse compression, power amplification by being switched fast of various switches, use the shortest time, the highest intensity with individual pulse
Or controlled repetition pulse form, give load by high-power electromagnetic energy abrupt release.Various high power load are with different things
High-power electromagnetic energy is converted to required form of energy by reason principle, forms extreme physical environment in controlled region,
Realize lower irrealizable function of general power.High pulse power technology anatonosis coal seam reservoirs is the shock wave coal that will produce
Reservoir, reaches the purpose of anatonosis.At present, this technology also lacks coal petrography fracturing effect, permeability variation feature and fluctuation parameters
Between quantitative relationship.
The amount between fluctuation parameters and coal petrography fracturing effect, permeability variation feature can be set up by physical simulation experiment
Change relation, but want to realize shock wave anti-reflection coal seam physical simulation experiment it may first have to the problem of solution is: make a scale
Degree, embodies actual coal petrography characteristic as far as possible, prevents test specimen quick crashing, it is simple to the experiment test specimen of experimental data statistics.
Summary of the invention
The present invention is to solve and set up fluctuation parameters and coal petrography fracturing effect, permeability variation spy by physical simulation experiment
The problem of the quantitative relationship between levying, it is provided that a kind of test specimen for shock wave anatonosis coal seam simulation experiment and method.
The present invention takes techniques below scheme: a kind of test specimen for shock wave anatonosis coal seam simulation experiment, including shell,
Strain brick and coal sample block foil gauge, described shell is bottomless rectangle shelly body, except other five faces of bottom inside shell
Centre position be fixed with strain brick, be fixed with coal sample block in shell, coal sample block is except the centre position in other five faces of bottom
Being fixed with two pieces of orthogonal placement coal sample block foil gauges, two lump coal sample block foil gauges are separately fixed at vertical direction and level side
To, strain brick is pressed on two lump coal sample block foil gauge surfaces.
Described shell is to pour with cement mortar to form.
The square brick body of 1cm × 5cm × 5cm that described strain brick is made up of cement mortar.
Described coal sample block foil gauge is PVDF resistance strain gage.
A kind of experimental technique completed based on the described test specimen for shock wave anatonosis coal seam simulation experiment, concrete steps
As follows:
1) square that coarse coal sample cuts into 15cm × 15cm × 15cm is block, every to square coal cinder after well cutting
Implementing further polish and polish in individual surface, and clears up each surface, removes the coal dust on surface, in order to next step glues
Patch foil gauge；And all surfaces of coal sample block is carried out labeling labelling, it is simple to comparison in follow-up experiment.
2) surface to square coal sample block carries out the stickup of coal sample block foil gauge, and one of them face is reserved sightingpiston,
Not doing gluing treatment, 2 coal sample block foil gauges, the position of 2 coal sample block foil gauges are pasted in each comfortable center, remaining 5 face
For orthogonal, in order to test the deformation behaviour in horizontal and vertical direction, and ensure that the traction polygon control survey of foil gauge is on 2 meters of left sides
Right.
3) for ensureing that coal cinder will not quickly be shattered in experimentation, and simulate coal seam and be hit under confined pressure effect ripple
Impact, at surrounding and the sticky one layer of certain thickness cement of end face of coal sample block, stay the reserved sightingpiston of coal sample block as sight
Examine crack and produce rule.
4), after test specimen processes, shock-wave experiment is carried out.
Shock-wave experiment is carried out under following experiment porch, and this experiment porch includes high power-assembling electricity pulser, pulley, steel
Frame, high intensity metal bucket and energy-storage capacitor, pulley is fixed under steelframe centre, pulley and is placed with high-strength iron bucket, high-strength
Piling in degree metal bucket as the medium propagated, high power-assembling electricity pulser is placed in water by pulley suspension of slinging, coal sample
Hang again by steelframe and be placed in water.
Described shock-wave experiment comprises the following steps that, first by high power-assembling electricity pulser pulley jib in experimentation
Rising, pulley is fixed on steelframe centre, places special high intensity metal bucket, pile as propagation medium in metal bucket under pulley
Tap water, coal sample hangs again by steelframe and is placed in water, connects each several part circuit, and circuit terminal is carried out ground connection,
Prevent electrostatic, by coal sample and high power-assembling electricity pulser to connecting after, whole experiment porch is connected common power, passes through
Transformator is converted into the intermediate frequency power supply of 600V, 1000Hz, then re-uses high voltage silicon rectifier stack and is rectified into 22kV high voltage direct current；
Energy-storage capacitor charges through choke coil；When the operation threshold of high power-assembling electricity pulser is broken through by energy-storage capacitor voltage,
The electric energy stored in energy-storage capacitor is converted into the mechanical energy pulse shock energy of water transmission through energy transducer, meanwhile
Powerful transient electromagnetic field is excited out, and energy-storage capacitor connects stored voltage amount in potentiometer testing capacitor, and electric capacity charges
After completing, opening energy storage switch and the transducing switch of pulser, discharge, the spacing of energy storage switch is 7.33mm, puts every time
Piezoelectric voltage is 22kV, and the moment of electric discharge, medium is breakdown, produces shock wave P ripple, and sample is entered by the electric discharge of high power-assembling electricity pulser
Row impact, often discharges and is sling by the highest power-assembling electricity pulser, and the record deformation behaviour of sample, eye slit produce rule
Rule.
The impact condition of coal sample is: the number of shocks of shock wave 250 times, and discharge voltage is 22kV, and discharge current is 50kA,
Shock wave peak pressure 100MPa, discharge frequency is 3～6 times/min, and operating temperature is room temperature, the coal sample before impact be 15cm ×
The square bulk coal sample of 15cm × 15cm, coal sample surface failure of rock after impact, but entirety remains in that integrity.
Compared with prior art, the test specimen yardstick that the present invention makes is big, it is simple to record deformation characteristic and system in experimentation
Meter cranny development situation, coal sample block appearance cement mortar plays the effect of simulation country rock；From the point of view of material similarity angle, use
The anatonosis model experiment of cement mortar modeling coal seam country rock；Test specimen manufacturing process is convenient, with low cost.
Accompanying drawing explanation
Fig. 1 is the test specimen structural representation for shock wave anatonosis coal seam simulation experiment；
Fig. 2 is shock-wave experiment platform schematic diagram；
1-coal sample block in figure, 2-shell, 3-strains brick, 4-coal sample block foil gauge, 5-steelframe, 6-pulley, 7-height power-assembling electricity pulse
Device, 8-high intensity metal bucket, 9-energy-storage capacitor.
Detailed description of the invention
As it is shown in figure 1, a kind of test specimen for shock wave anatonosis coal seam simulation experiment, including shell 2, strain brick 3 and coal
Sample block foil gauge 4, described shell 2 is bottomless rectangle shelly body, removes the interposition in other five faces of bottom inside shell 2
Putting and be fixed with strain brick 3, be fixed with coal sample block 1 in shell 2, coal sample block 1 is fixed except the centre position in other five faces of bottom
Having two pieces of orthogonal placement coal sample block foil gauges 4, two lump coal sample block foil gauges 4 are separately fixed at vertical direction and level side
To, strain brick 3 is pressed on two lump coal sample block foil gauge 4 surfaces.
Described shell 2 is to pour with cement mortar to form.
The square brick body of 1cm × 5cm × 5cm that described strain brick 3 is made up of cement mortar.
Described coal sample block foil gauge 4 is PVDF resistance strain gage.
The experimental technique of shock wave anatonosis coal seam simulation experiment, specifically comprises the following steps that
1) square that coarse coal sample cuts into 15cm × 15cm × 15cm is block, every to square coal cinder after well cutting
Implementing further polish and polish in individual surface, and clears up each surface, removes the coal dust on surface, in order to next step glues
Patch foil gauge；And all surfaces of coal sample block is carried out labeling labelling, it is simple to comparison in follow-up experiment.
2) surface to square coal sample block carries out the stickup of coal sample block foil gauge, and one of them face is reserved sightingpiston,
Not doing gluing treatment, 2 coal sample block foil gauges, the position of 2 coal sample block foil gauges are pasted in each comfortable center, remaining 5 face
For orthogonal, in order to test the deformation behaviour in horizontal and vertical direction, and ensure that the traction polygon control survey of foil gauge is on 2 meters of left sides
Right.
3) for ensureing that coal cinder will not quickly be shattered in experimentation, and simulate coal seam and be hit under confined pressure effect ripple
Impact, at surrounding and the sticky one layer of certain thickness cement of end face of coal sample block, stay the reserved sightingpiston of coal sample block as sight
Examine crack and produce rule.
4), after test specimen processes, shock-wave experiment is carried out.
Shock-wave experiment is carried out under following experiment porch, this experiment porch include high power-assembling electricity pulser 7, pulley 6,
Steelframe 5, high intensity metal bucket 8 and energy-storage capacitor 9, pulley is fixed on steelframe 5 centre, is placed with high-strength iron bucket under pulley
8, pile the tap water as propagation medium in high intensity metal bucket 8, high power-assembling electricity pulser 7 is sling suspension by pulley 6
Being placed in water, coal sample hangs again by steelframe 5 and is placed in water.
Described shock-wave experiment comprises the following steps that, first by high power-assembling electricity pulser pulley jib in experimentation
Rising, pulley is fixed on steelframe centre, places special high intensity metal bucket, pile as propagation medium in metal bucket under pulley
Tap water, coal sample hangs again by steelframe and is placed in water, connects each several part circuit, and circuit terminal is carried out ground connection,
Prevent electrostatic, by coal sample and high power-assembling electricity pulser to connecting after, whole experiment porch is connected common power, passes through
Transformator is converted into the intermediate frequency power supply of 600V, 1000Hz, then re-uses high voltage silicon rectifier stack and is rectified into 22kV high voltage direct current；
Energy-storage capacitor 9 charges through choke coil；When the operation threshold of high power-assembling electricity pulser 7 is broken through by energy-storage capacitor 9 voltage
Time, the electric energy stored in energy-storage capacitor 9 is converted into the mechanical energy pulse shock energy of water transmission through energy transducer, with this
The most powerful transient electromagnetic field is excited out, and energy-storage capacitor 9 connects stored voltage amount in potentiometer testing capacitor, electric capacity
After charging complete, opening energy storage switch and the transducing switch of pulser, discharge, the spacing of energy storage switch is 7.33mm, often
Secondary discharge voltage is 22kV, and the moment of electric discharge, medium is breakdown, produces shock wave P ripple, and it is right that high power-assembling electricity pulser 7 discharges
Sample impacts, and often discharges and is sling by the highest power-assembling electricity pulser 7, records the deformation behaviour of sample, eye slit
Produce rule.
The impact condition of coal sample is: the number of shocks of shock wave 250 times, and discharge voltage is 22kV, and discharge current is 50kA,
Shock wave peak pressure 100MPa, discharge frequency is 3～6 times/min, and operating temperature is room temperature, the coal sample before impact be 15cm ×
The square bulk coal sample of 15cm × 15cm, coal sample surface failure of rock after impact, but entirety remains in that integrity.
Embodiment: coal sample is from colliery, the Shan Xicheng village and the Lower Permian Series Shanxi group of building industry colliery.Bulk sample is cut
The square being slit into 15cm × 15cm × 15cm is block, and PM coal petrography, WYM coal sample and top board coal sample are respectively cut out 4 block briquettes.
After well cutting, implement further polish and polish in each surface to square coal cinder, and clears up each surface, goes
Except the coal dust on surface, to guarantee the successful stickup of foil gauge, and whole square surfaces of block coal sample are carried out labeling labelling,
Convenient comparison in follow-up experiment to each surface.On the basis of having worked above, the crack of coal sample is retouched
State.Before coal sample is processed further, it is sealed against in plastic bag, prevents surface from aoxidizing in atmosphere.
Next step work be the surface to square coal cinder carry out foil gauge stickup.The face of labelled " 6 "
For reserved sightingpiston, 2 foil gauges of each comfortable center stickup in remaining 5 face, the position of 2 foil gauges is orthogonal,
So that the traction wire (cable) that the deformation behaviour testing horizontal and vertical direction becomes sheet controls at about 2 meters.The most each coal
Stickup foil gauge quantity on block sample is 10, and traction wire is 20, and each wire is carried out labelling.
For ensureing that coal cinder will not quickly be shattered, and simulate coal seam and be hit under confined pressure effect the impact of ripple, at coal cinder
The sticky one layer of certain thickness cement of surrounding and bottom surface, stay the one side of coal cinder to produce rule as end face eye slit.Different
The strength of cement that cement makes with the proportioning of sandstone is different, in order to simulate different Surrounding Rock Strengths.Tentatively draft and joining with 3 kinds of cement
Than 3 kinds of confined pressure levels of simulation.Design 3 kinds of cement mortar mix ratios (mass ratio):
Proportioning A, cement: sand=1:3, the ratio of mud 0.6；
Proportioning B, cement: sand=1:4, the ratio of mud 0.7；
Proportioning C, cement: sand=1:5, the ratio of mud 0.8.
The cement making coal sample uses different formula, therefore needs to test the mechanical strength of cement under various formula, simulation
The mechanical strength test of confined pressure cement mortar.After the proportioning of cement mortar completes, the mortar of different ratio is utilized first to make strain brick,
Cement mortar first with different ratio makes the blockage of 1cm × 5cm × 5cm, maintenance 10 days so that it is solidification.Then
Paste orthogonal 2 foil gauges according to step illustrated above on cured square, and on foil gauge, stick insulation
Adhesive plaster protects.
Concretely comprising the following steps of the sticky cement mortar in coal cinder surface: first, make the square hard paper mould of length of side 25cm
Tool, mould has 4, without end face and bottom surface, the coal cinder pasting foil gauge is put into the position, middle of mould, such papery mould
Tool just leaves the space of 5cm width, pours, in the surrounding space and end face space of mould, the difference mixed into and join
The cement mortar of ratio, the periphery sides of coal sample defines the cement mortar of 5cm thickness, notes each coal sample during grouting
The foil gauge wire correspondence on surface pulls out, surrounding cement mortar and end face cement mortar in put into strain brick, draw simultaneously
Go out to strain the wire of brick.Finally whole test specimen is placed maintenance 30 days, until cement mortar is fully cured.
After sample processes, ultrasonic impact experiment can be carried out.The impact condition of coal sample is: number of shocks 250 times, puts
Piezoelectric voltage is 22kV, and discharge current is 50kA, shock wave peak pressure 100MPa, and discharge frequency is 3～6 times/min, work temperature
Degree is room temperature.Coal sample before impact is the square bulk coal sample of 15cm × 15cm × 15cm, coal sample surface failure of rock after impact, but
Entirety remains in that integrity.
First being sling by high power-assembling electricity pulser pulley in experimentation, pulley is fixed on steelframe centre.Sliding
Wheel is lower places special high intensity metal bucket, piles the tap water as propagation medium in metal bucket.Sample hangs again by steelframe
It is placed in water.Connect each several part circuit, and circuit terminal is carried out ground connection, prevent electrostatic.For preventing high intensity from rushing
Hitting the ripple interference to current signal, build between shielding, test strain work will complete in shielding.
Sample deformation behaviour under shock wave is completed by stress-strain test system.Test sample strain characteristics
Instrument be Divine Land, Beijing Science and Technology Ltd. of Easthome produce model RT-C32 passage dynamic strain indicator.The confession of dynamic strain indicator
Piezoelectric voltage AC 220V.Foil gauge wire in sample is connected in dynamic strain by strain bridge box.When normally measuring, will
The plug of bridge box accesses on the passage input socket of RT-C32 passage dynamic strain indicator, utilizes bridge box to form half-bridge mode.
The connected mode of half-bridge is: as interior half-bridge, R1, R2 For the noninductive wire-wound resistor in bridge box, resistance is all 120 Ω.To connect
Terminal 1 and 5,3 and 7,4 and 8 carry out short circuit respectively, and at the indirect operating resistance R of 1 and 23, between 2 and 3
Meet compensation resistance R4, connected mode is single-point half bridge measurement wiring, after checking that wiring is errorless, accesses dynamic strain indicator.Instrument week
Enclosing and to ensure not having high-intensity magnetic field interference and corrosive gas, wire, plug, line all should screw.Measure resistance and compensate electricity
The resistance value of resistance is consistent, and all connection wires use the cable with shielding action that specification is identical with length, raw coal in parallel
Coal sample, as eliminating the compensating plate that variations in temperature affects, forms path.Deformeter is connected to computer by USB wire, confirms
After wiring is errorless, chooses the channel number needing to gather, open power switch device, slowly regulate front panel with small screw driver
On zeroing knob, make the initial value of each passage near 0 value.Can carry out starting data acquisition, select suitable path,
The strain data collected is stored in computer.
Each discharge voltage is 22kV, and percussion number of times is before 50 times, and visible crack does not occurs in surface of test piece, punching
Hit and start to produce macroscopic minute fissure on the cement surface of test specimen after 50 times.Along with being incremented by of number of shocks, crack
Quantity is gradually increased, and Fracture Width and length are also with being gradually increased.After shock wave 75 times, the cement of simulation shoulder bed effects
Surface creates substantial amounts of crack, and crack mean breadth is at about 0.5cm；During number of shocks 100 times, average crack width increases
To about 1cm, part of cement is scattered from sample；When number of shocks reaches 125 times, cement is that bulk is caving from test specimen, directly
Accept shock wave impact experiment acting surface on cement substantially all come off, come out in coal petrography face.
After the cement of surface of test piece comes off substantially, the cement on surface is removed in cleaning, continues to rush test specimen at shock wave
During hitting, eye slit generation situation is carried out with the writing task of test specimen internal strain feature simultaneously.Coal sample is impacted, and sees
Examine coal sample external crack generation situation and test the strained situation on coal sample surface simultaneously.When number of shocks reaches 150 times, coal sample surface
Producing a small amount of crack, the mean breadth in crack is at about 0.1cm, because of percussion repeatedly on the plane of weakness that initial fissure is more
Producing part buckwheat coal, depart from from plane of weakness, the shape causing square coal cinder is the most regular；When number of shocks to 175, coal
Macroscopic crack, sample surface mean breadth increases to about 0.2cm, and the coal sample surface more weak broken granule of bonding takes off further
Fall；When number of shocks reaches 200 times, the crack in PM coal sample increases further, the crack increasing number in WYM coal sample, more greatly
The coal grain of block is caving from coal sample；Number of shocks on earth 225 time, the Depth in coal sample deepens further, touches with hands, can
To feel that the overall structure of coal sample is the weakest；When carrying out 250 Secondary Shocks, PM coal sample and WYM coal sample all occur one
The destruction completely in individual face, sightingpiston reserved when this face destroyed completely is sticky cement mortar.Visible cement shell is to coal sample
There is certain protective effect.For convenience the coal sample after impact is further analyzed test, when shock wave proceeds to
When 250 times, stopped the percussion to it, to preserve the integrity of coal sample.Utilize the complete coal sample that volume is bigger, can carry out
CT scan is tested, and drills through fender, carries out permeability test.
The strained situation in the foil gauge on coal sample surface and different ratio cement can be tested by dynamic strain indicator.When
When the cement protective layer on coal sample and surface is impacted by shock wave, coal sample and cement deform, be now pasted on coal sample with
And the foil gauge on strain brick surface deforms the most therewith, during deformation, the resistance wire in foil gauge is subject in various degree
Tension or shear action, when resistance wire receives extension, resistance wire attenuates or thicker therewith, and resistance value produces change,
Therefore strain-gauge test to magnitude of voltage start float.
When coal sample test specimen is carried out shock wave, surge generator faces a face of test specimen, the top of test specimen
Face is exposed outside as inspection surface, and left and right identical with the distance of surge generator, and therefore, the voltage only taking a face is surveyed
Test result.I.e. with surge generator as object of reference, choose the just front (numbering 1) of test specimen to generator, the back side (numbering
2), the right side (numbering 3), the foil gauge test result in bottom surface (numbering 4) upper 4 faces are analyzed.Maximum survey due to deformeter
The examination time is 80ms, therefore, can only test the magnitude of voltage under single-impact number of times, it is impossible to survey continuously in impact process every time
Examination.A secondary data is gathered every 0.08ms test during measurement.Experiment tests the 50th electric discharge and the 75th electric discharge respectively
Under magnitude of voltage.Therefore, each cement-like or coal sample collect 8 groups of data, and each face takes the 50th place value and puts for the 75th time
Electricity value, the numbering principle often organizing data is: coal sample (cement-like)-face numbering-number of shocks, such as proportioning A-1-50 represents A water
The magnitude of voltage of the 50th Secondary Shocks ripple of numbered the 1 of the cement of mud proportioning, WYM-2-75 represents the face of numbered the 2 of WYM coal
The magnitude of voltage of the 75th Secondary Shocks ripple.
From experimental result it can be seen that the test voltage in deformeter of the foil gauge in coal sample test specimen shock wave
In sinusoidal wave rule distribution, partial test result is because the electric jamming effect of shock wave generation, and the distribution of magnitude of voltage is more discrete,
But still keep sinusoidal wave rule.Shock wave 50 times compared with effect 75 times, voltage during 50 Secondary Shocks ripple effect
Value amplitude of fluctuation is relatively low, and 75 Secondary Shocks ripple applied voltage value amplitudes of fluctuation are higher.Strain value under i.e. 75 Secondary Shocks ripple effects is relatively
Greatly, the strain value under 50 Secondary Shocks ripple effects is less.
Claims (7)
1. the test specimen for shock wave anatonosis coal seam simulation experiment, it is characterised in that: include shell (2), strain brick (3) and
Coal sample block foil gauge (4), described shell (2) is bottomless rectangle shelly body, and shell (2) inner side is except other five faces of bottom
Centre position be fixed with strain brick (3), be fixed with coal sample block (1) in shell (2), coal sample block (1) is except other five of bottom
The centre position in face is fixed with two pieces of orthogonal placements coal sample block foil gauge (4), and two lump coal sample block foil gauge (4) are fixed respectively
Vertically and horizontally, strain brick (3) is pressed on two lump coal sample block foil gauge (4) surfaces.
Test specimen for shock wave anatonosis coal seam simulation experiment the most according to claim 1, it is characterised in that: outside described
Shell (2) is to pour with cement mortar to form.
Test specimen for shock wave anatonosis coal seam simulation experiment the most according to claim 1 and 2, it is characterised in that: described
The square brick body of 1cm × 5cm × 5cm be made up of cement mortar of strain brick (3).
Test specimen for shock wave anatonosis coal seam simulation experiment the most according to claim 3, it is characterised in that: described coal
Sample block foil gauge (4) is PVDF resistance strain gage.
5. the experimental technique completed based on the test specimen for shock wave anatonosis coal seam simulation experiment described in claim 4,
It is characterized in that:
Specifically comprising the following steps that 1) square that coarse coal sample cuts into 15cm × 15cm × 15cm is block, right after well cutting
Implementing further polish and polish in each surface of square coal cinder, and clears up each surface, removes the coal on surface
Powder, in order to next step pastes foil gauge；And all surfaces of coal sample block is carried out labeling labelling, it is simple to follow-up experiment is compared
Right；
2) surface to square coal sample block carries out the stickup of coal sample block foil gauge, and one of them face is reserved sightingpiston, does not does
Gluing treatment, 2 coal sample block foil gauges of each comfortable center stickup in remaining 5 face, the position of 2 coal sample block foil gauges is mutual
Perpendicular, in order to test the deformation behaviour in horizontal and vertical direction, and ensure that the traction polygon control survey of foil gauge is at about 2 meters；
3) for ensureing that coal cinder will not quickly be shattered in experimentation, and simulate coal seam and be hit under confined pressure effect the shadow of ripple
Ring, at surrounding and the sticky one layer of certain thickness cement of end face of coal sample block, stay the reserved sightingpiston of coal sample block to split as observation
Gap produces rule；
4), after test specimen processes, shock-wave experiment is carried out.
A kind of experiment side completed based on the test specimen for shock wave anatonosis coal seam simulation experiment the most according to claim 5
Method, it is characterised in that: shock-wave experiment is carried out under following experiment porch, and this experiment porch includes high power-assembling electricity pulser
(7), pulley (6), steelframe (5), high intensity metal bucket (8) and energy-storage capacitor (9), pulley is fixed on steelframe (5) centre, sliding
It is placed with high-strength iron bucket (8) under wheel, piles in high intensity metal bucket (8) as the medium propagated, high power-assembling electricity pulser
(7) being placed in water by pulley (6) suspension of slinging, coal sample hangs again by steelframe (5) and is placed in water；
Described shock-wave experiment comprises the following steps that, is first sling by high power-assembling electricity pulser pulley in experimentation,
Pulley is fixed on steelframe centre, places special high intensity metal bucket under pulley, metal bucket is piled as propagation medium from
Water, coal sample hangs again by steelframe and is placed in water, connects each several part circuit, and circuit terminal is carried out ground connection, anti-
Only produce electrostatic, by coal sample and high power-assembling electricity pulser to connecting after, whole experiment porch is connected common power, by becoming
Depressor is converted into the intermediate frequency power supply of 600V, 1000Hz, then re-uses high voltage silicon rectifier stack and is rectified into 22kV high voltage direct current；Storage
Can charge through choke coil by capacitor (9)；When the operation threshold of high power-assembling electricity pulser (7) is by energy-storage capacitor (9) voltage
During breakthrough, the electric energy stored in energy-storage capacitor (9) is converted into the mechanical energy pulse shock of water transmission through energy transducer
Can, the most powerful transient electromagnetic field is excited out, and energy-storage capacitor (9) stores electricity in connecting potentiometer testing capacitor
Pressure amount, after electric capacity charging complete, opens energy storage switch and the transducing switch of pulser, discharges, and the spacing of energy storage switch is
7.33mm, each discharge voltage is 22kV, and the moment of electric discharge, medium is breakdown, produces shock wave P ripple, and high power-assembling electricity pulse fills
Put (7) electric discharge sample is impacted, often discharge and the highest power-assembling electricity pulser (7) is sling, the deformation of record sample
Feature, eye slit produce rule.
A kind of experiment side completed based on the test specimen for shock wave anatonosis coal seam simulation experiment the most according to claim 6
Method, it is characterised in that: the impact condition of coal sample is: the number of shocks of shock wave 250 times, and discharge voltage is 22kV, discharge current
For 50kA, shock wave peak pressure 100MPa, discharge frequency is 3～6 times/min, and operating temperature is room temperature, the coal sample before impact
For the square bulk coal sample of 15cm × 15cm × 15cm, coal sample surface failure of rock after impact, but entirety remains in that integrity.
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| CN108593520A (en) * | 2018-05-07 | 2018-09-28 | 河南工程学院 | Electric pulse coal petrography fracturing anatonosis experimental system and experimental method under a kind of air environment |
| CN112557219A (en) * | 2019-09-26 | 2021-03-26 | 中国海洋石油集团有限公司 | Object model sample cracking effect experimental device and method based on controllable shock wave technology |
| CN112557219B (en) * | 2019-09-26 | 2023-05-09 | 中国海洋石油集团有限公司 | Object model sample fracturing effect experimental device and experimental method based on controllable shock wave technology |
| CN110823727A (en) * | 2019-11-21 | 2020-02-21 | 安徽理工大学 | High-voltage pulse discharge fracturing experimental platform for reforming oil and gas reservoir |
| CN111811938A (en) * | 2020-07-21 | 2020-10-23 | 重庆大学 | Strain brick and preparation method thereof |
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| CN112943371A (en) * | 2021-01-25 | 2021-06-11 | 华能煤炭技术研究有限公司 | Coal seam permeability increasing evaluation system with controllable shock waves |
| CN113218838A (en) * | 2021-04-23 | 2021-08-06 | 江西理工大学 | Coal core permeability tester and testing method |
| CN113218838B (en) * | 2021-04-23 | 2023-05-05 | 江西理工大学 | Coal core permeability tester and measuring method |
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