CN107560820A - Fully mechanized coal face inhomogeneous goaf flow field simulation experimental method - Google Patents
Fully mechanized coal face inhomogeneous goaf flow field simulation experimental method Download PDFInfo
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Abstract
The present invention relates to fully mechanized coal face inhomogeneous goaf flow field simulation experimental method, technical scheme is A, installation analogue experiment installation；B, simulation exploitation；Pass through jack movable block, form the goaf of simulation, the similar rock stratum in top starts to emit backwardness, open the heating tube below inbreak region, it is warming up to 200 300 DEG C, goaf real time temperature is monitored by thermocouple simultaneously, and separated in time carries out air suction sampling by exhaust tube to inbreak region, and numbering and remark information, the gas sample of collection is transported to use for laboratory gas chromatograph chemical examination gas componant, complete the acquisition of goaf temperature and gas experiment data, the present invention is according to live coal rock layer situation, similar coal rock layer is laid on casing and coaster, coal mining process is simulated by push-and-pull coaster, overlying coal rock layer is after coaster support is lost, it is deformed destroying until inbreak by deadweight, whole process is natural caving, the similarity of the inhomogeneous goaf of formation and scene greatly improves.
Description
Technical field
The present invention relates to flow field in goaf analogue experiment method, particularly a kind of fully mechanized coal face inhomogeneous goaf flow field
Analogue experiment method.
Background technology
China is the more serious country of coal spontaneous combustion, and resource and environmental loss are difficult to estimate caused by annual coal spontaneous combustion, by
In the rate of extraction is low, fltting speed is slow etc., reason, comprehensive coal-face of putting are more easy to coal spontaneous combustion problem occur.According to statistics, more than 95%
Coal spontaneous combustion occur inside the goaf that personnel can not look at straight or reach, so as to be difficult to accurately obtain coal spontaneous combustion burning things which may cause a fire disaster physics and chemistry join
Number, causes extinguishing effect bad, therefore, it is necessary to establish certain technical method research fully mechanized coal face goaf coal spontaneous combustion
Distribution and sprawling rule, instruct live goaf coal spontaneous combustion to put out a fire.
In recent years, scholar is mainly mined out to fully mechanized coal face in terms of numerical simulation and physical analogy two under lab
Area's coal spontaneous combustion problem is studied.There is more estimate in the selection of parameters for numerical simulation, so that analog result is inclined
From reality, it is necessary to be modified by physical model or field data.Because field data is restricted by many factors, acquisition is not easy
And error be present, therefore, build goaf physical model and carry out side of the physical analogy as relatively reliable solution goaf coal spontaneous combustion
Method.At present, existing goaf physical model is mostly to fill to form goaf with rubble, broken coal and other artificial materials, these
Filler top does not load overlying rock and forms pressure, and the goaf physical model that these hand packings are formed is loaded with overlying
After pressure, result of study can not coincide with live reality well.
In order to form the goaf physical model high with live similarity, inventor was in the patent applied and authorized in 2014
Number be ZL201410453668.1 " comprehensive to put/adopt coal wall flow field in goaf simulation test device and method ", through later
The research of phase finds that the device has problems with：It is 1. not high with live similarity.For example, during hydraulic lifting arm declines
Overlying coal rock layer can decline together with sliding block, it is difficult to form the high inhomogeneous goaf of similarity；Slider width is uniformly arranged, and is made
It is equal to obtain the progress mined every time；The comprehensive plenum height for putting coal-face in scene is support height, the plenum height in device
For support and caving coal height；The face goaf direction that worked in device does not have a baffle plate, and overlying coal rock layer, which emits to fall behind to exist, blocks work
The situation in face.2. hydraulic lifting arm is more, complex management, easily damage, it is difficult to change.For example, a length of 3800mm of this device, is removed
Rib length 400mm is protected at both ends, according to each simulation coal mining 50mm, then 68 row's hydraulic lifting arms are needed, by each sliding block
There are two hydraulic lifting arms below, then need 136 hydraulic lifting arms；Each hydraulic lifting arm needs oil pipe or tracheae, manages
It is complicated；There is inferior rate in hydraulic stem, one of to damage, and can influence experiment and be normally carried out；Consider lower safety and size,
The electronic components such as hydraulic lifting arm, thermocouple are difficult to change after damaging.3. device control is complicated, cost is high, prior art condition
Under be not easy to realize.For example, two hydraulic lifting arm synchronism stabilities are needed to decline when 68 row's sliding blocks decline so that installation cost is significantly
Degree increases；The frictional force between sliding block can be increased when inclination and debris between sliding block be present, it is specified so as to prevent sliding block from dropping to
Position；Sliding block is metal material, and device does not consider sliding block bottom heat dissipation problem；During sliding block declines, stope flow field can be disturbed,
Influence the accuracy of measurement data；Because the live progress of coal mining daily difference is, it is necessary to narrow sliding block, this becomes hydraulic lifting arm
Obtain more, and in the market is not readily available suitable hydraulic lifting arm.Therefore, it improves and innovated and be imperative.
The content of the invention
For the above situation, to overcome the defect of prior art, the purpose of the present invention is just to provide a kind of fully mechanized coal face
Inhomogeneous goaf flow field simulation experimental method, can effectively solve to mine using coaster pull simulation working face, by overlying coal
Rock stratum deadweight natural caving forms inhomogeneous goaf, higher with live similarity, and experimentation is reliably easy to operate, acquisition
The problem of experimental data confidence level is higher.
The technical scheme that the present invention solves is：
A kind of fully mechanized coal face inhomogeneous goaf flow field simulation experimental method, comprises the following steps：
Analogue experiment installation is installed A,
Described analogue experiment installation includes casing, and casing is hollow structure, and inside and outside pass through is provided with the front panel of casing
Logical coaster gateway, being horizontally disposed with casing has the track that casing is stretched out along coaster gateway, and coaster is provided with track, sliding
The jack for driving it to be slided along track is provided with car, horizontal top plate is provided with the top of coaster, top plate front end is set
There is a working face baffle plate extended downwardly from, top plate both sides are provided with the side shield vertically extended downwards, below side shield lower surface
The similar rock stratum in bottom is filled with casing, filled with top surface higher than on top plate between working face baffle plate, side shield and cabinet wall
The coal seam on surface, the coal seam of the raised area extend to cover top surface and cover cover top surface, filled out in the casing above coal seam
Filled with the similar rock stratum in top, top plate, working face baffle plate, side shield rock stratum similar with bottom surround simulation coal seam space jointly；
Longitudinally arranged intake and return aircourse, working face gear are respectively arranged with the side shield medial surface of both sides
It is provided with the roadway workface being arranged along the horizontal on the inside of plate, intake and return aircourse the both ends phase with roadway workface respectively
Connection, forms U-shaped aeration structure, working face baffle plate bottom is evenly equipped with multiple holes of leaking out being connected with roadway workface, air intake
The simulation that tunnel, return aircourse, roadway workface and hole of leaking out form goaf is leaked out system, the air outlet and drum of return aircourse
Blower fan is connected；
Coaster glide direction is provided with multigroup uniform bottoming hole on the bottom plate of casing, the bottom above bottoming hole is similar
The heating passage being connected with simulation coal seam space is provided with rock stratum, heating passage exists built with heating tube, bottoming hole surrounding
Uniform multiple pumping thermometer holes are provided with bottom plate, is evacuated in the similar rock stratum in bottom above thermometer hole and is provided with and simulation coal
The pumping thermometric passage that sheaf space 31 is connected, it is evacuated in thermometric passage and is respectively arranged with thermocouple and exhaust tube；
Pumping thermometer hole, the output end and Temperature sampler of thermocouple are stretched out in described thermocouple and the lower end of exhaust tube
It is connected, the lower end of exhaust tube is connected with vavuum pump, and sealing is provided between thermocouple, exhaust tube and pumping thermometer hole；
During installation, coaster is pulled out from casing first, heating tube, thermocouple, exhaust tube are arranged on box bottom,
Coaster is shifted onto in casing so that heating tube, thermocouple, exhaust tube upper end less than working face baffle plate and side shield lower end
Face, coaster is pulled out casing, lay the similar rock stratum in bottom on bottom plate, and in coal seam thick similar rock stratum upper berth 5mm, coaster
Move back and forth in casing so that coal seam and the lower surface of working face baffle plate and side shield thick similar rock stratum top 5mm is tight
Contiguity is touched, and coaster is pushed into casing innermost end, and top surface is then filled between working face baffle plate, side shield and cabinet wall is higher than
The coal seam of cover top surface, the coal seam of the raised area extends to cover top surface and covers cover top surface, then is filled out on coal seam
Fill the similar rock stratum 3b in top；
B, simulation exploitation
According to design step pitch and design interval time, by jack movable block, the goaf of simulation is formed, is opened simultaneously
Air blower is opened, it is distinguished and admirable to enter from intake, discharged by roadway workface from return aircourse, when by roadway workface,
It is distinguished and admirable by hole of leaking out to goaf air leaking, form goaf air leaking flow field；With the movement of coaster, the similar rock stratum in top loses
The support of top plate, the effect of ore deposit pressure incrementally increase, and when reaching the limit of rupture of the similar rock stratum in top, that is, are deformed destroying, directly
To being caving, so as to simulate the scene of erecting dense individual props, the similar rock stratum in top starts to emit backwardness, opens the heating below inbreak region
Pipe, 200-300 DEG C is warming up to, while goaf real time temperature is monitored by thermocouple, and separated in time passes through exhaust tube
Air suction sampling, and numbering and remark information are carried out to inbreak region, the gas sample of collection is transported to use for laboratory gas chromatograph
Gas componant is tested, analyzes O2、N2、CO、CO2、CH4、C2H6、C2H4、C3H8、C2H2Deng the volume fraction of gas, you can complete mined out
The acquisition of area's temperature and gas experiment data.
The method have the benefit that：
1st, according to live coal rock layer situation, similar coal rock layer is laid on casing and coaster, plant bulk design can meet
Geometric similarity, coal mining process is simulated by push-and-pull coaster, coaster moving parameter can be regulated and controled according to actual conditions, overlying coal petrography
Layer is deformed destroying until inbreak after coaster support is lost by deadweight, and whole process is natural caving, formation it is non-
The similarity in matter goaf and scene is high；
2nd, U-shaped ventilation shaft is laid in coaster bottom, realizes exhaust ventilation using air blower, device meets dynamic similarity
And kinematic similitude, in roadway workface goaf direction, uniform multigroup casement that leaks out is intended leaking out, stope space ventilator and leak out with
Live similarity is high；
3rd, using bottom half arrangement heating tube heating float coal spontaneous combustion of simulated coal high temperature dot, while goaf air leaking is simulated,
Float coal heats up under anaerobic environment to be produced gas heat and migration is spread inside inhomogeneous goaf, and goaf internal gas spreads fortune
It is high with live similarity to move environment, the goaf gas thermal field changing rule obtained herein under basis preferably can instruct scene to adopt
The identification and prevention and control of dead zone coal spontaneous combustion burning things which may cause a fire disaster；
4th, can be obtained as aspirating hole by the use of bottom half preformed hole as gas source of release, other bottom preformed holes
Gas Concentration Distribution Rules in Goaf under different gas source of releases and ventilation condition, have to preventing and treating goaf gas disaster and refer to
Lead meaning；
5th, device rapidoprint is easily chosen, and cost is low, and structure is reliably easy to operate, and heating tube, thermocouple and exhaust tube are the bottom of from
Plate is arranged, and is easily changed after breaking-up.Generally, device meets geometric similarity, dynamic similarity, kinematic similitude, obtained reality
Credible result degree height is tested, goaf coal spontaneous combustion burning things which may cause a fire disaster physical and chemical parameter and goaf gas concentration distribution rule are obtained available for accurate
Rule, experimental result can preferably instruct the positioning and goaf gas diaster prevention and control of live goaf coal spontaneous combustion burning things which may cause a fire disaster.
Brief description of the drawings
Fig. 1 is the sectional front view of experimental provision of the present invention.
Fig. 2 is the sectional front view (being not filled by similar rock stratum) of experimental provision of the present invention.
Fig. 3 is the top view (be not filled by similar rock stratum, do not install coaster) of experimental provision of the present invention.
Fig. 4 is the cross sectional side view of experimental provision of the present invention.
Fig. 5 is the cross sectional side view (being not filled by similar rock stratum) of experimental provision of the present invention.
Fig. 6 is the partial enlarged drawing at experimental provision sectional front view working face baffle plate of the present invention.
Fig. 7 is the scheme of installation of heating tube of the present invention.
Fig. 8 is the scheme of installation of thermocouple of the present invention and exhaust tube.
Fig. 9 is the structural representation of working face baffle plate of the present invention.
Figure 10 is the structural representation of coaster of the present invention.
Figure 11 is the structural representation of the U-shaped ventilating system of the present invention.
Figure 12-14 is erecting dense individual props process diagrammatic cross-section in present invention simulation exploitation
Embodiment
The embodiment of the present invention is described in further detail below in conjunction with accompanying drawing.
Provided by Fig. 1 to Figure 14：
A kind of fully mechanized coal face inhomogeneous goaf flow field simulation experimental provision, the analogue experiment installation include casing 1, case
Body 1 is hollow structure, the coaster gateway 29 of inside and outside insertion is provided with the front panel 11a of casing, being horizontally disposed with casing has
The track 7 of casing is stretched out along coaster gateway 29, coaster 2 is provided with track 7, is provided with coaster 2 for driving it along rail
The jack 14 that road slides, the top of coaster 2 are provided with horizontal top plate 10, and the front end of top plate 10 is provided with the working face extended downwardly from
Baffle plate 19, the both sides of top plate 10 are provided with the side shield 30 vertically extended downwards, are filled in the casing below the lower surface of side shield 30
There is the similar rock stratum 3a in bottom, be higher than the coal of cover top surface between working face baffle plate, side shield and cabinet wall filled with top surface
Layer 4, the coal seam of the raised area extends to cover top surface and covers cover top surface, filled with top in the casing of the top of coal seam 4
The similar rock stratum 3b in portion, top plate, working face baffle plate, side shield rock stratum similar with bottom surround simulation coal seam space 31 jointly；
Coaster glide direction is provided with multigroup uniform bottoming hole 20a on the bottom plate 6 of casing 1, above bottoming hole 20a
The heating passage 32a being connected with simulation coal seam space 31 is provided with the similar rock stratum in bottom, passage 32a is built with heating for heating
Pipe 25, bottoming hole 20a surroundings are provided with uniform multiple pumping thermometer hole 20b on bottom plate, the bottom being evacuated above thermometer hole 20b
The pumping thermometric passage 32b being connected with simulation coal seam space 31 is provided with the similar rock stratum in portion, is divided in pumping thermometric passage 32b
Thermocouple 22 and exhaust tube 23 are not provided with；
Longitudinally arranged intake 9a and return aircourse 9b, work are respectively arranged with the medial surface of side shield 30 of both sides
Make the inner side of face baffle plate 19 and be provided with the roadway workface 18 being arranged along the horizontal, intake 9a and return aircourse 9b respectively with work
The both ends in face tunnel 18 are connected, and form U-shaped aeration structure, and the bottom of working face baffle plate 19 is evenly equipped with multiple with roadway workface phase
The hole 21 of leaking out of connection, the simulation that intake, return aircourse, roadway workface and hole of leaking out form goaf are leaked out system；
The glide direction of coaster is set to longitudinal direction, is set to transverse direction perpendicular to the direction of coaster glide direction on horizontal plane.
For guarantee using effect, pumping thermometer hole 20b, thermoelectricity are stretched out in the lower end of described thermocouple 22 and exhaust tube 23
Even output end is connected with Temperature sampler, and the lower end of exhaust tube 23 is connected with vavuum pump, and thermocouple 22, exhaust tube and pumping are surveyed
Sealing 24 is provided between warm hole.Described pumping thermometric passage 32b can be arranged using steel pipe 26.The inwall of steel pipe 26 and thermoelectricity
Sealing 24 is provided between even, exhaust tube.
Described coaster 2 includes fixing muscle 33, the supporting plate 34 being welded in fixing muscle, is horizontally installed in supporting plate
Rotating shaft 35 and the pulley 8 being arranged on by bearing in rotating shaft, top plate 10 are horizontally set at the top of fixing muscle and supporting plate.
Described top plate 10 is linked together with working face baffle plate 19 by connector 27.
Described casing 1 be by horizontal alternate setting bottom plate 6 and cover plate 12 and be vertically arranged in bottom plate 6 and top plate 12
Between front panel 11a, rear board 11b and arranged on left and right sides the cuboid hollow structures that form of side plate 11c, set on casing 1
There is reinforcement 17, reinforcement 17 can use channel-section steel to make, and front panel 11a, rear board 11b and side plate 11c can use transparent Asia
Gram force plate makes, situation that can clearly in inspection box body.
The cross-brace 16 corresponding with jack, the base of jack 14 are provided with the front panel of described casing 1
It is fixed together with the vertical baffle 13 of coaster front end, the piston rod face vertical with the surface of cross-brace 16 of jack is horizontal
To the lumps of wood 15 being provided between support 16 and the piston rod of jack for extending support distances.
Described casing 1 and track 7 is arranged on pillar 5.
Every group of bottoming hole 20a has along bottom plate laterally uniform 3.
Covered with the girdle that 5mm is thick on the similar rock stratum 3a top surfaces in described bottom.
A kind of fully mechanized coal face inhomogeneous goaf flow field simulation experimental method, comprises the following steps：
Analogue experiment installation is installed A,
Described analogue experiment installation includes casing 1, and casing 1 is hollow structure, is provided with the front panel 11a of casing interior
The coaster gateway 29 of outer insertion, being horizontally disposed with casing has the track 7 that casing is stretched out along coaster gateway 29, is set on track 7
Coaster 2 is equipped with, the jack 14 for driving it to be slided along track is provided with coaster 2, the top of coaster 2 is provided with horizontal top
Plate 10, the front end of top plate 10 are provided with the working face baffle plate 19 extended downwardly from, and the both sides of top plate 10 are provided with the side vertically extended downwards
Baffle plate 30, the similar rock stratum 3a in bottom, working face baffle plate, side shield and casing are filled with the casing below the lower surface of side shield 30
It is higher than the coal seam 4 of cover top surface between inwall filled with top surface, the coal seam of the raised area extends to cover top surface and covered
Cover top surface, the casing of the top of coal seam 4 is interior to be filled with the similar rock stratum 3b in top, top plate, working face baffle plate, side shield and bottom
Similar rock stratum surrounds simulation coal seam space 31 jointly；
Longitudinally arranged intake 9a and return aircourse 9b, work are respectively arranged with the medial surface of side shield 30 of both sides
Make the inner side of face baffle plate 19 and be provided with the roadway workface 18 being arranged along the horizontal, intake 9a and return aircourse 9b respectively with work
The both ends in face tunnel 18 are connected, and form U-shaped aeration structure, and the bottom of working face baffle plate 19 is evenly equipped with multiple with roadway workface phase
The hole 21 of leaking out of connection, the simulation that intake, return aircourse, roadway workface and hole of leaking out form goaf are leaked out system,
Return aircourse 9b air outlet is connected with air blower；
Coaster glide direction (longitudinal direction) is provided with multigroup uniform bottoming hole 20a, bottoming hole 20a on the bottom plate 6 of casing 1
The heating passage 32a being connected with simulation coal seam space 31 is provided with the similar rock stratum in bottom of top, heating passage 32a is built-in
There is heating tube 25, bottoming hole 20a surroundings are provided with uniform multiple pumping thermometer hole 20b on bottom plate, are evacuated on thermometer hole 20b
The pumping thermometric passage 32b being connected with simulation coal seam space 31 is provided with the similar rock stratum in bottom of side, is evacuated thermometric passage
Thermocouple 22 and exhaust tube 23 are respectively arranged with 32b；
Pumping thermometer hole 20b, output end and the temperature of thermocouple are stretched out in described thermocouple 22 and the lower end of exhaust tube 23
Degree collector is connected, and the lower end of exhaust tube 23 is connected with vavuum pump, is provided between thermocouple 22, exhaust tube and pumping thermometer hole
Sealing 24；
Described coal seam is the dry scattered coal of field test working face mining, and described similar rock stratum is sand, land plaster, carbon
Sour calcium powder, borax and water carry out laying by different proportion mixing and formed.
During installation, coaster is pulled out from casing first, heating tube, thermocouple, exhaust tube, heat are arranged on box bottom
Galvanic couple is arranged in a hole with exhaust tube together with water pipe precaution, using being screwed；Coaster is shifted onto in casing so that add
Coaster is pulled out casing, the bottom of at by heat pipe, thermocouple, the upper end of exhaust tube less than the lower surface of working face baffle plate and side shield
Lay the similar rock stratum 3a in bottom on plate, and in coal seam thick similar rock stratum upper berth 5mm, coaster is moved back and forth in casing, made
Obtain the thick coal seams of similar rock stratum top 5mm to be in close contact with the lower surface of working face baffle plate and side shield, coaster is pushed into case
Body innermost end, the coal seam 4 that top surface is higher than cover top surface is then filled between working face baffle plate, side shield and cabinet wall,
The coal seam of the raised area extends to cover top surface and covers cover top surface, then on coal seam filling at the top of similar rock stratum 3b；
B, simulation exploitation
According to design step pitch and design interval time, by jack movable block, the goaf of simulation is formed, is opened simultaneously
Air blower is opened, it is distinguished and admirable to enter from intake 9a, discharged by roadway workface 18 from return aircourse 9b, by working face lane
During road, it is distinguished and admirable by hole 21 of leaking out to goaf air leaking, form goaf air leaking flow field；As the movement of coaster, top are similar
Rock stratum loses the support of top plate, and the effect of ore deposit pressure incrementally increases, and when reaching the limit of rupture of the similar rock stratum in top, that is, is deformed
Destroy, until being caving, so as to simulate the scene of erecting dense individual props, the similar rock stratum in top starts to emit backwardness, opened under inbreak region
The heating tube of side, 200-300 DEG C is warming up to, while goaf real time temperature is monitored by thermocouple, and separated in time is (such as
It is spaced 5-10 minutes) air suction sampling, and numbering and remark information are carried out to inbreak region by exhaust tube, the gas sample of collection is transported
Gas componant is chemically examined to use for laboratory gas chromatograph, analyzes O2、N2、CO、CO2、CH4、C2H6、C2H4、C3H8、C2H2Deng gas
Volume fraction, you can complete the acquisition of goaf temperature and gas experiment data.The temperature monitoring information of acquisition and pumping are analyzed
Data summarization is obtained to together, you can obtain the changing rule of goaf coal spontaneous combustion burning things which may cause a fire disaster physical and chemical parameter, disclose heterogeneous goaf
During goaf gas thermal field changing rule, the result of analog simulation is for recognizing spontaneous combustion state, the gaseous product in goaf
And migration rule and preventing and treating goaf coal spontaneous combustion catastrophe are significant.
If the changing rule in goaf gas flow field under the conditions of Cold simulating test is studied, using preformed hole on box bottom
As gas source of release, other preformed holes carry out pumping analytical test as exhaust tube, so as to obtain different gas releases
The flow field in goaf mash gas concentration regularity of distribution under source and ventilation condition.
It is well known by those skilled in the art that for analog simulation experimental device, most critical seeks to improve experiment dress
The similarity with scene is put, it is of the invention according to live coal rock layer situation so as to which the experimental result made just has a reference significance,
Similar coal rock layer is laid on casing and coaster, plant bulk design meets geometric similarity, and coal mining process is simulated by push-and-pull coaster,
Coaster moving parameter can be regulated and controled according to actual conditions, and overlying coal rock layer produces change after coaster support is lost, by deadweight
Shape is destroyed until inbreak, whole process are natural caving, and the similarity of the inhomogeneous goaf and scene of formation greatly improves；
U-shaped ventilation shaft is laid in coaster bottom, and exhaust ventilation is realized using air blower, and device meets dynamic similarity and kinematic similitude,
In roadway workface goaf direction, uniform multigroup casement that leaks out is intended leaking out, and stope space ventilator and leaks out and live similarity
It is high；Using bottom half arrangement heating tube heating float coal spontaneous combustion of simulated coal high temperature dot, while goaf air leaking is simulated, float coal is lacking
Under oxygen environment heating produce gas heat simultaneously inside inhomogeneous goaf spread migration, goaf internal gas sprawling migration environment with
Live similarity is high, and the lower goaf gas thermal field changing rule obtained in basis can preferably instruct live goaf coal certainly herein
Fire the identification and prevention and control of burning things which may cause a fire disaster；By the use of bottom half preformed hole as gas source of release, other bottom preformed holes as aspirating hole,
The Gas Concentration Distribution Rules in Goaf under different gas source of releases and ventilation condition can be obtained, to preventing and treating goaf gas calamity
Evil has directive significance；Device rapidoprint is easily chosen, and cost is low, and structure is reliably easy to operate, heating tube, thermocouple and exhaust tube
It is arranged from bottom plate, is easily changed after breaking-up.Generally, device meets geometric similarity, dynamic similarity, kinematic similitude, obtains
Reliable experiment result degree it is high, obtain goaf coal spontaneous combustion burning things which may cause a fire disaster physical and chemical parameter and goaf gas concentration distribution available for accurate
Rule, experimental result can preferably instruct the positioning and goaf gas diaster prevention and control of live goaf coal spontaneous combustion burning things which may cause a fire disaster, be
Innovation on flow field in goaf analogue experiment installation and method, there is good social and economic benefit.
Claims (6)
1. a kind of fully mechanized coal face inhomogeneous goaf flow field simulation experimental method, it is characterised in that comprise the following steps：
Analogue experiment installation is installed A,
Described analogue experiment installation includes casing (1), and casing (1) is hollow structure, is provided with the front panel (11a) of casing
The coaster gateway (29) of inside and outside insertion, being horizontally disposed with casing has the track (7) that casing is stretched out along coaster gateway (29), rail
Coaster (2) is provided with road (7), the jack (14) for driving it to be slided along track, coaster (2) are provided with coaster (2)
Top is provided with horizontal top plate (10), and top plate (10) front end is provided with the working face baffle plate (19) extended downwardly from, top plate (10)
Both sides are provided with the side shield (30) vertically extended downwards, similar filled with bottom in the casing below side shield (30) lower surface
Rock stratum (3a), it is higher than the coal seam (4) of cover top surface between working face baffle plate, side shield and cabinet wall filled with top surface, it is high
The coal seam for going out part extends to cover top surface and covers cover top surface, and top phase is filled with the casing above coal seam (4)
Like rock stratum (3b), top plate, working face baffle plate, side shield rock stratum similar with bottom surround simulation coal seam space (31) jointly；
Longitudinally arranged intake (9a) and return aircourse (9b) are respectively arranged with side shield (30) medial surface of both sides,
It is provided with the roadway workface (18) being arranged along the horizontal on the inside of working face baffle plate (19), intake (9a) and return aircourse (9b)
The both ends with roadway workface (18) are connected respectively, form U-shaped aeration structure, and working face baffle plate (19) bottom is evenly equipped with multiple
The hole of leaking out (21) being connected with roadway workface, intake, return aircourse, roadway workface and hole of leaking out form goaf
Simulation leak out system, the air outlet of return aircourse (9b) is connected with air blower；
Coaster glide direction is provided with multigroup uniform bottoming hole (20a) on the bottom plate (6) of casing (1), on bottoming hole (20a)
The heating passage (32a) being connected with simulation coal seam space (31), heating passage (32a) are provided with the similar rock stratum in bottom of side
Built with heating tube (25), bottoming hole (20a) surrounding is provided with uniform multiple pumping thermometer holes (20b) on bottom plate, pumping
The pumping thermometric passage being connected with simulation coal seam space (31) is provided with the similar rock stratum in bottom above thermometer hole (20b)
(32b), pumping thermometric passage (32b) is interior to be respectively arranged with thermocouple (22) and exhaust tube (23)；
Described thermocouple (22) and the lower end of exhaust tube (23) stretch out pumping thermometer hole (20b), the output end of thermocouple with
Temperature sampler is connected, and the lower end of exhaust tube (23) is connected with vavuum pump, between thermocouple (22), exhaust tube and pumping thermometer hole
It is provided with sealing (24)；
During installation, coaster is pulled out from casing first, heating tube, thermocouple, exhaust tube are arranged on box bottom, coaster
Shift onto in casing so that heating tube, thermocouple, exhaust tube upper end less than working face baffle plate and side shield lower surface,
Coaster pulls out casing, lays the similar rock stratum (3a) in bottom on bottom plate, and in coal seam thick similar rock stratum upper berth 5mm, coaster
Move back and forth in casing so that coal seam and the lower surface of working face baffle plate and side shield thick similar rock stratum top 5mm is tight
Contiguity is touched, and coaster is pushed into casing innermost end, and top surface is then filled between working face baffle plate, side shield and cabinet wall is higher than
The coal seam of cover top surface, the coal seam of the raised area extends to cover top surface and covers cover top surface, then is filled out on coal seam
Fill the similar rock stratum 3b in top；
B, simulation exploitation
According to design step pitch and design interval time, by jack movable block, the goaf (28) of simulation is formed, is opened simultaneously
Air blower is opened, it is distinguished and admirable to enter from intake (9a), discharged by roadway workface (18) from return aircourse (9b), by work
When making face tunnel, it is distinguished and admirable by hole of leaking out (21) to goaf air leaking, form goaf air leaking flow field；With the movement of coaster,
The similar rock stratum in top loses the support of top plate, and the effect of ore deposit pressure incrementally increases, when reaching the limit of rupture of the similar rock stratum in top, i.e.,
It is deformed destroying, until being caving, so as to simulate the scene of erecting dense individual props, the similar rock stratum in top starts to emit backwardness, and unlatching emits
The heating tube settled in an area below domain, 200-300 DEG C is warming up to, while goaf real time temperature is monitored by thermocouple, and be spaced one
Fix time and air suction sampling, and numbering and remark information are carried out to inbreak region by exhaust tube, the gas sample of collection is transported to experiment
Gas componant is chemically examined in room with gas chromatograph, analyzes O2、N2、CO、CO2、CH4、C2H6、C2H4、C3H8、C2H2Deng the volume integral of gas
Number, you can complete the acquisition of goaf temperature and gas experiment data.
2. flow field simulation experimental method in fully mechanized coal face inhomogeneous goaf according to claim 1, it is characterised in that step
Coaster (2) described in rapid A includes fixing muscle (33), the supporting plate (34) being welded in fixing muscle, is horizontally installed in supporting plate
Rotating shaft (35) and the pulley (8) that is arranged on by bearing in rotating shaft, top plate (10) be horizontally set on fixing muscle and supporting plate top
Portion.
3. flow field simulation experimental method in fully mechanized coal face inhomogeneous goaf according to claim 1, it is characterised in that step
Casing (1) described in rapid A be by horizontal alternate setting bottom plate (6) and cover plate (12) and be vertically arranged in bottom plate (6) and push up
The hollow knot of cuboid that the side plate (11c) of front panel (11a), rear board (11b) and arranged on left and right sides between plate (12) is formed
Structure.
4. flow field simulation experimental method in fully mechanized coal face inhomogeneous goaf according to claim 1, it is characterised in that step
The cross-brace corresponding with jack (16), the base of jack (14) are provided with the front panel of casing (1) described in rapid A
It is fixed together with the vertical baffle (13) of coaster front end, the piston rod of jack is vertical just with the surface of cross-brace (16)
Right, cross-brace (16) is provided with the lumps of wood (15) for extending support distances between the piston rod of jack.
5. flow field simulation experimental method in fully mechanized coal face inhomogeneous goaf according to claim 1, it is characterised in that step
Casing (1) and track (7) described in rapid A are arranged on pillar (5).
6. flow field simulation experimental method in fully mechanized coal face inhomogeneous goaf according to claim 1, it is characterised in that every
Group bottoming hole (20a) has along bottom plate laterally uniform 3.
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