CN205719792U - Shock loading induction coal and gas prominent pilot system under raw coal sample - Google Patents
Shock loading induction coal and gas prominent pilot system under raw coal sample Download PDFInfo
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- CN205719792U CN205719792U CN201620646692.1U CN201620646692U CN205719792U CN 205719792 U CN205719792 U CN 205719792U CN 201620646692 U CN201620646692 U CN 201620646692U CN 205719792 U CN205719792 U CN 205719792U
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Abstract
The utility model discloses shock loading induction coal and gas prominent pilot system under a kind of raw coal sample, test device including dead load bringing device, high pressure gas feedway, vacuum extractor, shock loading bringing device and intensity of outburst；The invention also discloses the test method of shock loading induction coal and gas prominent pilot system under the raw coal sample described in use, sequentially include the following steps: successively and first pilot system is carried out airtight test, reconnect axially loaded cylinder body and horizontal direction cylinder body, evacuation again, then in coal sample, it is filled with gas, then applies shock loading.This utility model is suitable to raw coal sample as subjects, shock loading can be simulated and cause the phenomenon of Gas Outburst, the environment that under ore deposit, Gas Outburst is on-the-spot can be simulated more realistically, the beginning ridge part of coal and gas prominent can be accurately obtained, the most truly, reliably study coal and gas prominent rule and phenomenon.
Description
Technical field
This utility model relates to a kind of studying colliery Gas Disaster pests occurrence rule and the simulation experiment system of mechanism thereof, is suitable for
In testing in raw coal sample Imitating shock loading.
Background technology
Coal and gas prominent means underground coal mine such a coal body dynamic phenomenon: in very short time, by coal body to lane
Road (including stope) sprays suddenly substantial amounts of gas and the coal of pulverizing, and in coal body, forms the cavity of certain special shape.
The fine coal of ejection is moved entrained by Gas-Flow, and causes certain dynamic effect (pushing over mine car, megalith, destruction support etc.).
According to coal and gas prominent comprehensive function hypothesis, coal and gas prominent is at crustal stress, gas pressure and coal body physical mechanics property
A kind of complicated dynamic disaster phenomenon occurred under the influence of matter comprehensive function, coal and gas prominent is to threaten Safety of Coal Mine Production
Serious natural disaster, therefore the research to coal and gas prominent mechanism can explain the occurrence condition of coal mine gas disaster
And rule, so that prominent preventive measure more specific aim and actual effect.
Since the eighties in 20th century, the scholar of China achieves much one-tenth in terms of coal and gas prominent mechanism test research
Just, since Deng Quan envelope in 1989 have developed one-dimensional coal and gas prominent simulation test device, the most each relevant colleges and universities and research
Mechanism have developed in succession can simulate various experimental condition and be applicable to the coal and gas prominent simulation of different raw coal sample size
Rig for testing, and achieve a series of achievement in research.But from the point of view of present Research, current prominent analog there is also with
Lower problem and shortage:
(1) simulation highlights process qualitatively.What current prominent analog was provided that is the most all a kind of deterministic simulation,
Prominent energy size cannot be calculated.
(2) raw coal sample many employings coal dust compacting used by.Coal dust compacting moulded coal no matter on physico-mechanical properties, or
On internal void/fissured structure, all there is the biggest difference with raw coal sample, use moulded coal raw coal sample to obviously reduce simulation
The verity of process of the test.
(3) existing prominent equipment cannot simulate prominent front coal body thickness to prominent impact.In coal and gas prominent mistake
Cheng Zhong, coal column thickness is an important parameter, and the thickest being less susceptible to of coal column occurs to highlight.On-the-spot highlighting is all at certain thickness
Occur under the conditions of coal column, be therefore necessary to consider the material impact of coal column thickness when simulation is prominent.
(4) pilot system before highlighting is closed system.Down-hole coal and gas prominent is to hold at coal-bed gas
Continuing generation during outwards gushing out, and current assay device is when prominent, before occurring to highlight, methane gas is the most all
It is in a kind of closed state, only just allows Gas, this processing method and scene Gas opening aspis moment
Open systems run counter to.
(5) coal body whether reach adsorption-desorption balance can not preferably weigh, ocurrence of coal seam is in underground, at certain gas
Under pressure, through the absorption of long period, it mostly is adsorption equilibrium state, if coal body is not up to adsorption equilibrium, is impacting
During test, coal gas absorption situation is not inconsistent with scene.
Utility model content
The purpose of this utility model is to provide shock loading induction coal and gas prominent test system under a kind of raw coal sample
System, is suitable to raw coal sample as subjects, it is possible to simulation shock loading causes the phenomenon of Gas Outburst, and can be truer
The environment that under simulation ore deposit, Gas Outburst is on-the-spot.
For achieving the above object, shock loading induction coal and gas prominent pilot system under raw coal sample of the present utility model
Test including dead load bringing device, high pressure gas feedway, vacuum extractor, shock loading bringing device and intensity of outburst
Device；
Dead load bringing device includes axially loaded cylinder body, axially loaded cylinder body to include by the first flange arrangement being connected to
Upper cylinder together and lower cylinders, in axially loaded cylinder body, vertically axis direction is provided with load bar, the top of load bar
Upward sliding seals and stretches out upper cylinder, and the bottom of load bar extends downwardly into lower cylinders, and the bottom of load bar is provided with lower piston
Head, lower piston head is connected with the inwall slipper seal of lower cylinders, surrounds coal sampling mill between lower piston head and lower cylinders；
Load bar in the middle part of upper cylinder is provided with upper piston head, and upper piston head connects with the inwall slipper seal of upper cylinder
Connecing, upper cylinder top sidewall is provided with hydraulic fluid port, and upper hydraulic fluid port is positioned at above upper piston head；Bottom upper cylinder, sidewall is provided with lower oil
Mouthful, lower hydraulic fluid port is between upper piston head and lower piston head；Upper cylinder is connected by upper hydraulic fluid port and lower hydraulic fluid port hydraulic loaded
Mechanism；
Intensity of outburst test device includes the sidewall of horizontal direction cylinder body, the left end of horizontal direction cylinder body and described coal sampling mill
It is connected；Be provided with horizontal direction piston rod in horizontal direction cylinder body along horizontal axis direction, the right-hand member of horizontal direction piston rod is sliding
Horizontal direction cylinder body is stretched out in movable sealing and connection has baffle plate；The left end of horizontal direction piston rod is provided with left piston head, left piston head
It is connected with the inwall slipper seal of horizontal direction cylinder body；
The coal column for simulating prominent front coal body thickness, coal column it is filled with in horizontal direction cylinder body on the left of left piston head
The horizontal direction cylinder body at place is provided with left air gauge and simulation is gushed out interface, simulation interface of gushing out connects and has blow-down pipe, blow-down pipe
It is provided with the gas atmospheric valve for simulating Gas；Horizontal direction cylinder body on the right side of left piston head be provided with right air gauge and
Cylinder body atmospheric valve；The right-hand member of horizontal direction cylinder body is provided with the first displacement transducer, and horizontal direction piston rod stretches out horizontal direction cylinder
The part of body connects described first displacement transducer；Horizontal direction piston rod on the left of baffle plate is provided with the first strain gauge；
High pressure gas feedway includes high pressure gas tank, and high pressure gas tank is connected by the first gas pipeline buffering
Tank, surge tank is connected by the second gas pipeline gas two-position three-way valve, and gas two-position three-way valve connects the 3rd gas pipe
Road, the 3rd gas pipeline connects the sidewall of described coal sampling mill；First gas pipeline is provided with switch valve, on the 3rd gas pipeline
It is provided with protecting against shock switch valve；
Vacuum extractor includes vacuum-pumping pipeline, and one end of vacuum-pumping pipeline is connected with described gas two-position three-way valve,
Vacuum-pumping pipeline is provided with vacuometer and vacuum switch valve；The other end of vacuum-pumping pipeline connects vacuum pump；
Shock loading bringing device includes that two root posts, two root posts lay respectively at left side and the right side of axially loaded cylinder body
Side, the top of two root posts is higher than being fixedly connected with crossbeam between axially loaded cylinder body, and the top of two root posts, crossbeam is downward
Connecting and have two mark posts being provided with guide rail, slidably connect counterweight group between two mark posts, the top of counterweight group connects lifting
Device；
Described load bar protrudes upward the part of axially loaded cylinder body and is provided with the second strain gauge, the top of described load bar
End connection has loading plate, and being connected between loading plate and the top of axially loaded cylinder body has second displacement sensor；Described counterweight group
It is positioned at the surface of loading plate.
Described hydraulic loading mechanism includes the first connected pipes, the second connected pipes and hydraulic pump, and hydraulic pump connects one
Root send oil pipe and two oil return pipes, two oil return pipes to be respectively the first oil return pipe and the second oil return pipe；
First connected pipes connect described upper hydraulic fluid port, second connected pipes connect described lower hydraulic fluid port, the first connected pipes and
Connecting between second connected pipes and have the 3rd oil pipe, the 3rd oil pipe to be provided with oil circuit two-position three-way valve, oil circuit two-position three-way valve is even
Pick oil pipe and make to send oil pipe to select connection the first connected pipes or the second connected pipes；
The end of the first connected pipes connects the first oil return pipe by the first switch valve, and the end of the second connected pipes passes through
Second switch valve connects the second oil return pipe；
Along sending oil direction, send to be sequentially provided with on oil pipe and send oil circuit breaker valve, oil pressure adjusting valve and send oil hydralic pressure gauge；First oil return
It is respectively equipped with oil return hydralic pressure gauge on pipe and the second oil return pipe.
Described blow-down pipe is provided with emptying air gauge, and the end of blow-down pipe connects gasresolution instrument；Horizontal direction cylinder body
Including left cylinder and right cylinder body, left cylinder left end is fixedly connected on lower cylinders and is connected with coal sampling mill, a left side for right cylinder body
End is connected with left cylinder by the second flange arrangement.
Described high pressure gas feedway also includes high pressure helium gas tank, and the outlet of high pressure helium gas tank and high pressure gas tank is respectively
Connecting has an export pipeline, the export pipeline of high pressure gas tank to be provided with gas export switch valve and depressurization gas valve, high pressure helium
The export pipeline of gas tank is provided with helium gate out switch valve and helium air relief valve；High pressure helium gas tank and the outlet of high pressure gas tank
Described in Lu Junyu, the first gas pipeline is connected.
This utility model is not only able to carry out qualitative test, and experimental condition is the most accurate, it is possible to the most accurately count
Calculate prominent energy size, thus analyze result of the test more accurately, instruct coal mining activity to put into practice more accurately.This utility model profit
Test by raw coal sample, eliminate the internal void/fissured structure using the coal sample of fine coal compacting to bring with raw coal not
With, the really degree that improve simulation test procedure compared with the past.In prominent simulation test, this utility model is with conventional
Similar assay device is compared, can simulate in test prominent before the process trying under open condition naturally gushed out of gas
Test, it is possible to simulation front coal column thickness is on prominent impact, and tries when raw coal sample is in gas adsorption poised state
Test.It addition, the load that this utility model is provided with vertical direction applies function, can simulate the deadweight of overlying rock in coal seam should
Power, can be accurately obtained the beginning ridge part of coal and gas prominent, including stress beginning ridge part and gas pressure beginning ridge part.Above spy
Point makes experimental condition of the present utility model closer to on-the-spot physical condition, can highlight process by simulated field exactly, the most very
In fact, reliably studying coal and gas prominent rule and phenomenon, the genesis mechanism offer for research coal and gas prominent tries reliably
Test basis, and guide coal production to put into practice.
Accompanying drawing explanation
Fig. 1 is the structural representation of shock loading induction coal and gas prominent pilot system under raw coal sample；
Fig. 2 is the schematic diagram of the monitoring result of shock loading in three tests；
Fig. 3 is the monitoring result schematic diagram of horizontal load in three tests；
Fig. 4 is that three Water In The Experiments square are to piston rod and the monitoring result schematic diagram of left piston head displacement；
Fig. 5 is the monitoring result of vertical direction displacement in three experiments；
Fig. 6 is the enlarged drawing in Fig. 1 at A；
Fig. 7 is the enlarged drawing in Fig. 1 at intensity of outburst test device；
Fig. 8 is the enlarged drawing in Fig. 1 at dead load bringing device；
Fig. 9 is the enlarged drawing at Fig. 1 mesohigh gas feedway.
Detailed description of the invention
As shown in Figures 1 to 9, shock loading induction coal and gas prominent pilot system under raw coal sample of the present utility model
Test including dead load bringing device, high pressure gas feedway, vacuum extractor, shock loading bringing device and intensity of outburst
Device；
Dead load bringing device includes axially loaded cylinder body, axially loaded cylinder body to include by the first flange arrangement 39 connecting
Upper cylinder 8 together and lower cylinders 84, in axially loaded cylinder body, vertically axis direction is provided with load bar 9, load bar 9
Top upward sliding seal and stretch out upper cylinder 8, the bottom of load bar 9 is passed down through the first flange arrangement 39 and stretches into bottom cylinder
Body 84, the bottom of load bar 9 is provided with lower piston head 85, and lower piston head 85 is connected with the inwall slipper seal of lower cylinders 84, under
Coal sampling mill 18 is surrounded between piston head 85 and lower cylinders 84；
Load bar 9 in the middle part of upper cylinder 8 is provided with upper piston head 86, and upper piston head 86 is sliding with the inwall of upper cylinder 8
Movable sealing connects, and upper cylinder 8 top sidewall is provided with hydraulic fluid port 6, and upper hydraulic fluid port 6 is positioned at above upper piston head 86；Upper cylinder 8 end
Portion's sidewall is provided with lower hydraulic fluid port 7, and lower hydraulic fluid port 7 is between upper piston head 86 and lower piston head 85；Upper cylinder 8 is by upper hydraulic fluid port 6
Connect with lower hydraulic fluid port 7 and have hydraulic loading mechanism；
Intensity of outburst test device includes the side of horizontal direction cylinder body, the left end of horizontal direction cylinder body and described coal sampling mill 18
Wall is connected；It is provided with horizontal direction piston rod 11 along horizontal axis direction in horizontal direction cylinder body, horizontal direction piston rod 11
Horizontal direction cylinder body is stretched out in right-hand member slipper seal and connection has baffle plate 44；The left end of horizontal direction piston rod 11 is provided with left piston head
87, left piston head 87 is connected with the inwall slipper seal of horizontal direction cylinder body；
The coal column 19 for simulating prominent front coal body thickness it is filled with in horizontal direction cylinder body on the left of left piston head 87,
Horizontal direction cylinder body at coal column 19 is provided with left air gauge 21 and simulation is gushed out interface 88, simulation interface 88 of gushing out connects and puts
Blank pipe 89, blow-down pipe 89 is provided with the gas atmospheric valve 13 for simulating Gas；Horizontal direction on the right side of left piston head 87
Cylinder body is provided with right air gauge 50 and cylinder body atmospheric valve 12；The right-hand member of horizontal direction cylinder body is provided with the first displacement transducer 14, water
Square to piston rod 11 stretch out horizontal direction cylinder body part connect described first displacement transducer 14；Level on the left of baffle plate 44
Direction piston rod 11 is provided with the first strain gauge 16；
High pressure gas feedway includes high pressure gas tank 46, and high pressure gas tank 46 is connected by the first gas pipeline 74 to be had
The gas pressure that the setting of surge tank 48(surge tank 48 can make high pressure gas feedway export is more stable), surge tank 48
Being connected by the second gas pipeline 75 and have gas two-position three-way valve 27, gas two-position three-way valve 27 connects the 3rd gas pipeline
76, the 3rd gas pipeline 76 connects the sidewall of described coal sampling mill 18；First gas pipeline 74 is provided with switch valve 30, the 3rd watt
This pipeline 76 is provided with protecting against shock switch valve 77.
Vacuum extractor includes vacuum-pumping pipeline 73, one end of vacuum-pumping pipeline 73 and described gas two-position three-way valve 27 phase
Connecting, vacuum-pumping pipeline 73 is provided with vacuometer 24 and vacuum switch valve 31；The other end of vacuum-pumping pipeline 73 connects to be had very
Empty pump 43.
Shock loading bringing device includes that two root posts 3, two root posts 3 lay respectively at left side and the right side of axially loaded cylinder body
Side, the top of two root posts 3 is higher than being fixedly connected with crossbeam 2, crossbeam 2 between axially loaded cylinder body, and the top of two root posts 3
Connecting downwards and have two mark posts being provided with guide rail 4, slidably connect counterweight group 5 between two mark posts 4, the top of counterweight group 5 is even
It is connected to lifting device 1；
The part that described load bar 9 protrudes upward axially loaded cylinder body is provided with the second strain gauge 17, described load bar 9
Top connect have loading plate 90, being connected between loading plate 90 and the top of axially loaded cylinder body has second displacement sensor 15；
Described counterweight group 5 is positioned at the surface of loading plate 90.
Crossbeam 2 and column 33 grade play support fixation, prevent because the effect of impulsive force causes package unit to topple over,
By lifting device 1, counterweight 5 is promoted to certain altitude then discharge, measures shock height by band guide rail mark post 4 and serve as
Guide rail when counterweight 5 glides；The counterweight of release applies shock loading to load bar 9, and shock loading reaches coal sample by load bar 9
On raw coal sample in room 18；The axial static load applying raw coal sample is by hydraulic loading mechanism and lower piston head 85
Realize.
The shock loading applying raw coal sample is monitored by the second strain gauge 17, and raw coal sample is in shock loading
The second displacement sensor 15 that is displaced through under Zuo Yong is monitored.
During use, hydraulic loading mechanism regulates the size of added dead load by hydraulic pump 38 and oil pressure adjusting valve 37, uses
To simulate in underground coal mine recovery process, Strata Overlying The Seam pressure.
Described hydraulic loading mechanism includes the first connected pipes the 78, second connected pipes 79 and hydraulic pump 38, hydraulic pump 38
Connecting has one to send oil pipe 80 and two oil return pipes, two oil return pipes to be respectively the first oil return pipe 81 and the second oil return pipe 82；
First connected pipes 78 connects described upper hydraulic fluid port 66, and the second connected pipes 79 connects described lower hydraulic fluid port 7, and first connects
Connecting between oil pipe 78 and the second connected pipes 79 has the 3rd oil pipe 83, the 3rd oil pipe 83 to be provided with oil circuit two-position three-way valve 28,
Oil circuit two-position three-way valve 28 connection is sent oil pipe 80 and makes to send oil pipe 80 to select connection the first connected pipes 78 or the second connected pipes
79；
The end of the first connected pipes 78 connects the first oil return pipe 81 by the first switch valve 32, the second connected pipes 79
End connects the second oil return pipe 82 by second switch valve 33；
Along sending oil direction, send to be sequentially provided with on oil pipe 80 and send oil circuit breaker valve 34, oil pressure adjusting valve 37 and send oil hydralic pressure gauge 25；
It is respectively equipped with oil return hydralic pressure gauge 26 on first oil return pipe 81 and the second oil return pipe 82.
Described blow-down pipe 89 is provided with emptying air gauge 22, and the end of blow-down pipe 89 connects gasresolution instrument 49；Level
Direction cylinder body include left cylinder 71 and right cylinder body 72, left cylinder 71 left end be fixedly connected on lower cylinders 84 and with coal sampling mill 18
Being connected, the left end of right cylinder body 72 is connected with left cylinder 71 by the second flange arrangement 40.
Described high pressure gas feedway also includes going out of high pressure helium gas tank 47, high pressure helium gas tank 47 and high pressure gas tank 46
Mouth is connected to an export pipeline, and the export pipeline of high pressure gas tank 46 is provided with gas export switch valve 29 and depressurization gas
Valve 41, the export pipeline of high pressure helium gas tank 47 is provided with helium gate out switch valve 36 and helium air relief valve 42；High pressure helium gas tank 47
All it is connected with described first gas pipeline 74 with the export pipeline of high pressure gas tank 46.
The invention also discloses shock loading induction coal and gas prominent pilot system under the above-mentioned raw coal sample of use
Test method, sequentially include the following steps: successively
(1) first pilot system is carried out airtight test, it is ensured that pilot system is air tight；The concrete grammar of airtight test
It is: open helium gate out switch valve 36, helium air relief valve 42, switch valve 30 and protecting against shock switch valve 77, makes gas two three
Logical valve 27 connects the second gas pipeline 75 and the 3rd gas pipeline 76；
By helium air relief valve 42, helium pressure is regulated to predetermined value, then by high pressure helium gas cylinder 47 to coal sampling mill 18
The helium of middle injection predetermined pressure；
If left air gauge 21 reading in 2 hours keeps constant, then showing that pilot system is air tight, pilot system is airtight
Property is good；If left air gauge 21 reading in 2 hours reduces, then check after concurrency processing system leak source, re-start airtight
Property check step；After checking that result shows that pilot system air-tightness is good, close helium gate out switch valve 36 and carry out next step
Suddenly；
(2) raw coal sample is loaded；Open the first flange arrangement 39, unload upper cylinder 8 and load bar 9, will carry out in advance
A raw coal sample (diameter 100mm, length 200mm) loading coal specimen chamber 18, use fine breeze by raw coal sample and coal sampling mill
Space between 18 inwalls is filled up and is compacted；
(3), after installing raw coal sample, upper cylinder 8 and load bar 9 are installed, tighten the bolt at the first flange arrangement 39
Thus upper cylinder 8 and lower cylinders 84 are fixed together；
Using the coal column 19 of coal dust compacting predetermined thickness, coal column 19 is in order to simulate prominent front coal column 19 to intensity of outburst
Impact；Coal column 19 is put into left cylinder 71, horizontal direction piston rod 11 is arranged in right cylinder body 72, righter cylinder body 72 is led to
Cross the second flange arrangement 40 to be connected with left cylinder 71, tighten the bolt at the second flange arrangement 40 thus by left cylinder 71 and the right side
Cylinder body 72 is fixed together；The right position of regulation horizontal direction piston rod 11, makes left side and the lower cylinders 84 of coal column 19
Inwall flush；Baffle plate 44 is used to be fixed by the left end of horizontal direction piston rod 11；
Hydraulic loading mechanism and load bar 9 is utilized downwards raw coal sample to be applied one in order to simulate Strata Overlying The Seam
The axial load (less) of weight stress, to ensure that load bar 9 will not be by upwards jack-up being filled with methane gas when；
(4) this step is to coal sampling mill 18 evacuation；Open vacuum switch valve 31 and protecting against shock switch valve 77, make gas
Two-position three-way valve 27 connects vacuum-pumping pipeline 73 and the 3rd gas pipeline 76；
Open vacuum pump 43, coal sampling mill 18 evacuation to loading raw coal sample, observe coal sample at any time by vacuometer 24
Vacuum situation of change in room 18；Being no less than the time of raw coal sample evacuation 12 hours, it is pre-that coal sampling mill 18 reaches test
After fixed vacuum, close vacuum pump 43 and vacuum switch valve 31；
(5) gas two-position three-way valve 27 is made to connect the second gas pipeline 75 and the 3rd gas pipeline 76；Open gas export
Switch valve 29 and switch valve 30, and regulate gas pressure by depressurization gas valve 41, make high pressure gas tank 46 to raw coal sample
In be filled with the methane gas of predetermined pressure, until raw coal sample reaches adsorption-desorption poised state；
(6) after raw coal sample reaches adsorption-desorption balance, it is ensured that switch valve 30, gas export switch valve 29 and protecting against shock
Switch valve 77 is closed；
Utilize load bar 9 downwards raw coal sample to be applied the load that test is predetermined, thus simulate Strata Overlying The Seam and produced
Raw weight stress；Then open gas atmospheric valve 13, simulate Gas phenomenon；When relative watt shown by left air gauge 21
When this pressure is zero, the end of blow-down pipe 89 is received on desorption instrument, utilize shock loading bringing device that raw coal sample is applied
The shock loading of predefined size, removes baffle plate 44 simultaneously, sees whether protrusion phenomenon；
After counterweight 5 discharges, removed by baffle plate 44 simultaneously, raw coal sample is broken under impact loading, after crushing
Raw coal sample promotes horizontal direction piston rod 11 under shock loading and gas pressure act on jointly outwards (shown in Fig. 1 to the right
Direction) it is subjected to displacement；Strain gauge 16 monitors the magnitude of load of horizontal direction suffered by raw coal sample before shock loading applies；
The displacement size of horizontal direction piston rod 11 after the prominent generation of displacement transducer 14 monitoring, right air gauge 50 can be with level monitoring side
Air pressure change in cylinder body, according to the frictional resistance suffered by displacement size, horizontal direction piston rod 11 and horizontal direction
Pressure monitoring value in cylinder body can obtain prominent energy size.
(7) after above 6 steps, without there is protrusion phenomenon, then raw coal sample is changed, by selecting difference
The counterweight group 5 of quality or change the size of shock loading by counterweight group 5 is promoted to different height, repeats above-mentioned (1)
～(6) step, until there is protrusion phenomenon；If it occur that protrusion phenomenon, then utilize computer automatically to monitor and preserve the first displacement
Sensor 14, second displacement sensor the 15, first strain gauge 16 and the test data of the second strain gauge 17, by meter
Calculate and obtain the input impact energy of raw coal sample and highlight the intensity of outburst after occurring.
In described (5th) step, it is judged that raw coal sample reaches the method for adsorption-desorption balance and is: 1. make raw coal sample inhale
Attached gas is after 12 hours, and closedown switch valve 30 and protecting against shock switch valve are after 77,2 hours, if the reading of left air gauge 21
Number instability, shows that raw coal sample does not reaches adsorption-desorption balance, is now again turned on switch valve 30 and protecting against shock switch
Valve 77, continues to be filled with the methane gas of predetermined pressure in raw coal sample, and re-executes this judgements raw coal sample and reach to adsorb
The method of desorbing balance；If the reading of left air gauge 21 no longer changes, then show that raw coal sample has reached adsorption-desorption and put down
Weighing apparatus state, now closed gas gate out switch valve 29；
According to the gas pressure fall utilized in surge tank 48, and the dead space of coal sampling mill 18 and associated pipe calculates
The gas adsorption amount size of raw coal sample.
In described (6th) step, utilize shock loading bringing device that raw coal sample is applied the shock loading of predefined size
Concrete operations be:
First determine quality and the hoisting depth of counterweight group 5 according to the size of predetermined shock loading, then use lifting
Device 1 discharges after counterweight group 5 is promoted to predetermined altitude, and counterweight group 5 impacts loading plate 90 and by load bar 9 to former after falling
Coal coal sample applies the shock loading of predefined size.
In described (3rd) step, hydraulic loading mechanism and load bar 9 is utilized downwards raw coal sample to be applied one in order to mould
The concrete operations of the axial load intending the weight stress of Strata Overlying The Seam are: open and send oil circuit breaker valve 34, make oil circuit two three
Oil pipe 80 and the first connected pipes 78 are sent in logical valve 28 connection；Close the first switch valve 32 thus interrupt the first connected pipes 78 and
The connection of one oil return pipe 81, opens second switch valve 33 thus connects the second connected pipes 79 and the second oil return pipe 82；Start liquid
Press pump 38, makes hydraulic oil through sending oil pipe 80, oil circuit two-position three-way valve the 28, first connected pipes 78 and upper hydraulic fluid port 66 to enter top
Cylinder body 8 also promotes upper piston head 86 to move down；When upper piston head 86 moves down, by the hydraulic oil warp below upper piston head 86
Cross down hydraulic fluid port the 77, second connected pipes 79, second switch valve 33 and the second oil return pipe 82 and be back to hydraulic pump 38.
After having tested, make oil circuit two-position three-way valve 28 connection send oil pipe 80 and the second connected pipes 79, and open the
One switch valve 32 thus connect the first connected pipes 78 and the first oil return pipe 81, close second switch valve 33 thus interrupt second even
Connect oil pipe 79 and the connected state of the second oil return pipe 82.Now under the dynamic action of hydraulic pump 38, hydraulic oil is through sending oil pipe
80, oil circuit two-position three-way valve the 28, second connected pipes 79 and lower hydraulic fluid port 77 enter upper cylinder 8 and promote upper piston head 86 upwards
Mobile；When upper piston head 86 moves up, by the hydraulic oil above upper piston head 86 through upper hydraulic fluid port the 66, first connected pipes
78, the first switch valve 32 and the first oil return pipe 81 are back to hydraulic pump 38, so that load bar 9 and lower piston head 85 reset.
Assume that prominent process fullness in the epigastrium and abdomen be enough to lower condition: 1. highlight as thermostatic process；The most various energy in process of the test all
Release is complete, and without the energy loss of other forms；3. coal body gravity acting, the generation energy such as acoustic emission, radiation in process of the test
Amount loss can be ignored.
When meeting conditions above, the prominent energy Wt of coal and gas prominent simulation test device can be approximately and overcome level
Cylinder frictional force work WfDo work Ws sum with horizontal cylinder piston compressed gas, concrete such as below equation 1:
In formula: FfFor left piston head 87 sliding-frictional resistance, the friction of rear pilot system is 4.71 kN after measured；L is water
The maximum displacement of flat piston, the i.e. cavity length of horizontal direction cylinder body deduct the numerical value after coal column 19 thickness (length), unit
For rice；X is the actual displacement amount of horizontal piston in process of the test, and unit is rice；P0 is original gas pressure in horizontal direction cylinder body
Power, unit is Pa；V0 is original gas volume in horizontal direction cylinder body, and unit is cubic meter.
The present embodiment, according to above-mentioned test thinking, has carried out the prominent simulation test under three Secondary Shocks load-up conditions altogether, point
Not for 1# test, 2# test and 3# test.
The static state that three tests are applied is the most the same with dynamic load, and concrete experimental condition is shown in Table 1, without coal column in 1# test
19 impacts, all consider coal column 19 to prominent impact in 2# and 3# test, and except for the difference that 3# tests when shock loading applies,
Consider the impact of desorption of mash gas.
Table 1 experimental condition
Preliminary result of the test is shown in Table 2:
Table 2 result of the test
According to the prominent energy size that formula 1 can calculate in 1# experiment it isW t=766.70 J, 2# experiment in prominent
Energy size isW t=518.95 J, 3# experiment highlights, and prominent energy is zero.
Claims (4)
1. shock loading induction coal and gas prominent pilot system under raw coal sample, it is characterised in that: include that dead load applies dress
Put, high pressure gas feedway, vacuum extractor, shock loading bringing device and intensity of outburst test device；
Dead load bringing device includes axially loaded cylinder body, axially loaded cylinder body to include by the first flange arrangement linking together
Upper cylinder and lower cylinders, in axially loaded cylinder body, vertically axis direction is provided with load bar, and the top of load bar is upwards
Upper cylinder is stretched out in slipper seal, and the bottom of load bar extends downwardly into lower cylinders, and the bottom of load bar is provided with lower piston head, under
Piston head is connected with the inwall slipper seal of lower cylinders, surrounds coal sampling mill between lower piston head and lower cylinders；
Load bar in the middle part of upper cylinder is provided with upper piston head, and upper piston head is connected with the inwall slipper seal of upper cylinder,
Upper cylinder top sidewall is provided with hydraulic fluid port, and upper hydraulic fluid port is positioned at above upper piston head；Bottom upper cylinder, sidewall is provided with lower hydraulic fluid port,
Lower hydraulic fluid port is between upper piston head and lower piston head；Upper cylinder is connected by upper hydraulic fluid port and lower hydraulic fluid port hydraulic loaded machine
Structure；
Intensity of outburst test device includes that horizontal direction cylinder body, the left end of horizontal direction cylinder body are connected with the sidewall of described coal sampling mill
Logical；Be provided with horizontal direction piston rod in horizontal direction cylinder body along horizontal axis direction, the right-hand member of horizontal direction piston rod slides close
Envelope stretches out horizontal direction cylinder body and connection has baffle plate；The left end of horizontal direction piston rod is provided with left piston head, left piston head and water
Square to cylinder body inwall slipper seal connect；
The coal column for simulating prominent front coal body thickness it is filled with, at coal column in horizontal direction cylinder body on the left of left piston head
Horizontal direction cylinder body is provided with left air gauge and simulation is gushed out interface, simulation interface of gushing out connects and has blow-down pipe, and blow-down pipe sets
There is the gas atmospheric valve for simulating Gas；Horizontal direction cylinder body on the right side of left piston head is provided with right air gauge and cylinder body
Atmospheric valve；The right-hand member of horizontal direction cylinder body is provided with the first displacement transducer, and horizontal direction piston rod stretches out horizontal direction cylinder body
Part connects described first displacement transducer；Horizontal direction piston rod on the left of baffle plate is provided with the first strain gauge；
High pressure gas feedway includes high pressure gas tank, and high pressure gas tank is connected by the first gas pipeline surge tank, slow
Rushing tank and have gas two-position three-way valve by the second gas pipeline connection, gas two-position three-way valve connects the 3rd gas pipeline, the
Three gas pipelines connect the sidewall of described coal sampling mill；First gas pipeline is provided with switch valve, and the 3rd gas pipeline is provided with
Protecting against shock switch valve；
Vacuum extractor includes vacuum-pumping pipeline, and one end of vacuum-pumping pipeline is connected with described gas two-position three-way valve, takes out true
Blank pipe road is provided with vacuometer and vacuum switch valve；The other end of vacuum-pumping pipeline connects vacuum pump；
Shock loading bringing device includes that two root posts, two root posts lay respectively at left side and the right side of axially loaded cylinder body, two
The top of root post is higher than being fixedly connected with crossbeam between axially loaded cylinder body, and the top of two root posts, crossbeam connects downwards
Having two mark posts being provided with guide rail, slidably connect counterweight group between two mark posts, the top of counterweight group connects lifting device；
Described load bar protrudes upward the part of axially loaded cylinder body and is provided with the second strain gauge, and the top of described load bar is even
Being connected to loading plate, being connected between loading plate and the top of axially loaded cylinder body has second displacement sensor；Described counterweight group is positioned at
The surface of loading plate.
Shock loading induction coal and gas prominent pilot system under raw coal sample the most according to claim 1, its feature exists
In: described hydraulic loading mechanism includes the first connected pipes, the second connected pipes and hydraulic pump, and hydraulic pump connects has one to send oil
Pipe and two oil return pipes, two oil return pipes are respectively the first oil return pipe and the second oil return pipe；
First connected pipes connects described upper hydraulic fluid port, and the second connected pipes connects described lower hydraulic fluid port, the first connected pipes and second
Connecting between connected pipes and have the 3rd oil pipe, the 3rd oil pipe to be provided with oil circuit two-position three-way valve, the connection of oil circuit two-position three-way valve is sent
Oil pipe also makes to send oil pipe to select connection the first connected pipes or the second connected pipes；
The end of the first connected pipes connects the first oil return pipe by the first switch valve, and the end of the second connected pipes passes through second
Switch valve connects the second oil return pipe；
Along sending oil direction, send to be sequentially provided with on oil pipe and send oil circuit breaker valve, oil pressure adjusting valve and send oil hydralic pressure gauge；First oil return pipe and
Oil return hydralic pressure gauge it is respectively equipped with on second oil return pipe.
Shock loading induction coal and gas prominent pilot system under raw coal sample the most according to claim 1, its feature exists
In: described blow-down pipe is provided with emptying air gauge, and the end of blow-down pipe connects gasresolution instrument；Horizontal direction cylinder body includes a left side
Cylinder body and right cylinder body, left cylinder left end is fixedly connected on lower cylinders and is connected with coal sampling mill, and the left end of right cylinder body passes through
Second flange arrangement is connected with left cylinder.
Shock loading induction coal and gas prominent test system under raw coal sample the most according to any one of claim 1 to 3
System, it is characterised in that: described high pressure gas feedway also includes going out of high pressure helium gas tank, high pressure helium gas tank and high pressure gas tank
Mouth is connected to an export pipeline, and the export pipeline of high pressure gas tank is provided with gas export switch valve and depressurization gas valve,
The export pipeline of high pressure helium gas tank is provided with helium gate out switch valve and helium air relief valve；High pressure helium gas tank and high pressure gas tank
Export pipeline is all connected with described first gas pipeline.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910913A (en) * | 2016-06-27 | 2016-08-31 | 河南理工大学 | Test system and method for coal and gas outburst induced by impact load under coal sample of raw coal |
| CN109991391A (en) * | 2019-04-09 | 2019-07-09 | 重庆大学 | The rock stratum of coal measures containing tomography coal and gas prominent simulation experiment method |
-
2016
- 2016-06-27 CN CN201620646692.1U patent/CN205719792U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910913A (en) * | 2016-06-27 | 2016-08-31 | 河南理工大学 | Test system and method for coal and gas outburst induced by impact load under coal sample of raw coal |
| CN105910913B (en) * | 2016-06-27 | 2018-12-04 | 河南理工大学 | Shock loading induces coal and gas prominent pilot system and method under raw coal sample |
| CN109991391A (en) * | 2019-04-09 | 2019-07-09 | 重庆大学 | The rock stratum of coal measures containing tomography coal and gas prominent simulation experiment method |
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