CN209432604U - The mechanical behavior and seepage characteristic in-situ test system of coal and rock - Google Patents
The mechanical behavior and seepage characteristic in-situ test system of coal and rock Download PDFInfo
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- CN209432604U CN209432604U CN201822272974.1U CN201822272974U CN209432604U CN 209432604 U CN209432604 U CN 209432604U CN 201822272974 U CN201822272974 U CN 201822272974U CN 209432604 U CN209432604 U CN 209432604U
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Abstract
The utility model provides the mechanical behavior and seepage characteristic in-situ test system of coal and rock, including gas source, vacuum pump, test suite, signal acquisition transmission assembly and ground monitoring station, the test suite includes top platen, loaded member, test specimen, bottom platen, anchor cable stress meter, flat jack, axial displacement meter, radial displacement meter and gas separate cavities, the test suite is installed in the slotting for being arranged in and in face of adopting in square coal and rock, the signal acquisition transmission assembly includes displacement acquisition device, stress collector and down-hole information acquisition station, stress collector is connect with anchor cable stress meter, displacement acquisition device is connect with axial displacement meter and radial displacement meter respectively, displacement acquisition device and stress collector are connected by cable with down-hole information acquisition station, down-hole information acquisition station is connect by cable with ground monitoring station.
Description
Technical field
The utility model belongs to geotechnical engineering field, is related to mechanical behavior and the seepage characteristic in-situ test system of coal and rock
System.
Background technique
Into after the deep mining stage, coal petrography preservation stress and gas pressure are significantly increased, the practice of coal and gas power phenomenon
Also new challenge has been welcome.Engineering practice shows coal and rock not only by load action, also by fluid migration, temperature, biology
Or the influence of many factors such as action of chemicals, and connected each other between each influence factor, it is formed completely more to coal and rock
Field coupling, and then the mechanical response of coal and rock is influenced, so that coal and rock is showed significant power in different concrete practices
Learn nature difference.Germinating, extension and the evolution of coal and rock mining induced fissure network have migration of the gas in it most important
Influence, mining induced fissure network is most important gas migration channel in coal and rock always.Therefore, it is necessary to consider in-situ stress shape
The influence of state and true disturbance path, the disturbance of the engineering activities such as exploitation or excavation is combined out with the seepage characteristic of coal and rock
Exhibition research.
Existing research method is mostly the coal and rock permeability research for the unloading stress state carried out under scale indoors, only office
It is limited to influence of the experimental condition to permeability itself to be studied and illustrated, there is no about mining induced stress ring true in recovery process
Coal and rock under the influence of border adopts the report of dynamic behavior and seepage characteristic research.
For example, CN104374684A discloses the system for testing mining active process off-load coal and rock permeability, it is main to wrap
It includes that gas source, vacuum pump, gas pressure stabilizing heats control device, the MTS confining pressure chamber with test specimen, further includes cooperating with these components
Valve, pressure gauge and flowmeter etc..The test macro can accurately control coal and rock load, note in MTS rock mechanics test macro
On the basis of recording stress and deformation data, the application of extraneous gas pressure stabilizing constant temperature seepage flow condition is realized, still, the test macro is still
It so has the following disadvantages and has much room for improvement:
(1) although referring to the test macro in the document may be implemented the stabilization of mining active process off-load coal and rock permeability
Accurate test, but in fact, the test macro is still to be tested under laboratory conditions, loading method is desirability
, can only approximate simulation mining induced stress change procedure, but the variation of actual mining induced stress is extremely complex, the test system
System does not consider that also the influence of true mining induced stress environment can not be integrated in test process, and the permeability of coal and rock is with aobvious
The stress and porosity sensibility of work, therefore the Utopian change procedure for simulating mining induced stress is only passed through using the test macro
It cannot achieve and coal and rock permeability is accurately tested, the accuracy and referentiability of test result all need to be mentioned
It is high.
(2) loading method of the test macro loads for single linear, and the evolutionary process of actually mining induced stress is
Extremely complex, which can not react influence of the support pressure wave characteristic for coal and rock permeability.
(3) test process of the test macro is completed in laboratory, is not in situ environment, is needed to design gas and is added
Hot device and heating controller in advance regulate and control gas temperature, and the temperature on the locating ground of deep mining is with the difference of geological conditions
It is different to will be different, therefore the test macro is difficult to accurately simulate actual temperature condition, since temperature will affect in coal and rock
Fluid migration etc., and then influence the mechanical response of coal and rock, this is also unfavorable for the raising of the accuracy of test result.
(4) test macro is mainly based upon what MTS rock mechanics test macro was tested, belongs to laboratory installation,
It can not be directly in the underground environment application of deep mining.
Existing laboratory test linear loading analogy method is a kind of research mode for material properties, is disturbed with engineering
It is dynamic and uncorrelated.It is difficult to restore live coal and rock crack evolution and seepage flow to break through test macro and the test of indoor scale
The bottleneck of the in-situ mechanicals variation characteristic such as characteristic develops the power that can carry out coal and rock under true disturbance path under scale at the scene
Scholarship and moral conduct is and the in-situ testing device of seepage characteristic and relevant test method are very necessary.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide the mechanical behavior and seepage characteristic of coal and rock
In-situ test system cannot reflect the mechanical behavior of coal and rock under the influence of true mining induced stress to solve existing laboratory testing rig
With seepage characteristic deficiency.
The mechanical behavior and seepage characteristic in-situ test system of coal and rock provided by the utility model, including gas source, vacuum
Pump, test suite, signal acquisition transmission assembly and ground monitoring station,
The test suite includes top platen, loaded member, test specimen, bottom platen, anchor cable stress meter, flat jack, axis
To displacement meter, radial displacement meter and gas separate cavities, gas barrier chamber is cylinder, and one end of loaded member is cylindrical load
The outer diameter of head, loading head is matched with the internal diameter of gas barrier chamber, and loading head is equipped with sealing ring, and loaded member, which is equipped with to be opened on, to be added
The air guiding through hole of carrier head end face and loaded member side wall, bottom platen are equipped with air guiding through hole and cable through hole；
The test suite is installed in the slotting for being arranged in and in face of adopting in square coal and rock, in slotting from top to bottom successively
Flat jack, anchor cable stress meter, bottom platen, test specimen, loaded member and top platen, flat jack and top platen difference are installed
It is contacted with the bottom surface of slotting and top surface, the position that slotting is contacted with flat jack and top platen is horizontal plane, gas barrier chamber
Lower end be fixed in bottom platen, test specimen is placed vertically in gas barrier chamber, and the end face of loading head contacts simultaneously with the top of test specimen
In gas barrier chamber, axial displacement meter and radial displacement meter are installed on test specimen, axial displacement meter and radial displacement meter
Cable pass through bottom platen on cable through hole draw gas barrier chamber；
The signal acquisition transmission assembly includes that displacement acquisition device, stress collector and down-hole information acquisition station, stress are adopted
Storage is connect with anchor cable stress meter, and displacement acquisition device is connect with axial displacement meter and radial displacement meter respectively, displacement acquisition device and
Stress collector is connected by cable with down-hole information acquisition station；The ground monitoring station includes ground monitoring computer；
Gas source is connected to through air inlet pipeline with gas barrier chamber, and gas barrier chamber is through the air guiding through hole and outlet in bottom platen
Pipeline connection, gas source are connect with one end of the first valve and the second valve respectively through the first pressure reducing valve, the other end of the first valve
It being controlled to a vacuum pump, the other end of the second valve is connected to through the second pressure reducing valve, first flowmeter with the air guiding through hole in loaded member,
First pressure sensor is equipped on pipeline between first flowmeter and loaded member, air inlet pipeline is equipped with the second decompression of connection
The bye-pass at valve both ends, bye-pass are equipped with third valve；Air guiding through hole in bottom platen is through the 4th valve and second flow
Meter connects, and the pipeline after second flowmeter is equipped with second pressure sensor；First pressure sensor, second pressure sensing
Device, first flowmeter and second flowmeter are connect by cable with down-hole information acquisition station, and down-hole information acquisition station passes through cable
It is connect with ground monitoring computer.
In the technical solution of above-mentioned test macro, the piston rod of flat jack, the stress probe of anchor cable stress meter, bottom pressure
The axis of air guiding through hole, test specimen and loaded member on plate is located along the same line.
In the technical solution of above-mentioned test macro, the stress that the diameter of the piston rod of flat jack is greater than anchor cable stress meter is visited
The diameter of head, the size of bottom platen are greater than the size of the stress probe of anchor cable stress meter, the ruler of top platen and bottom platen
The very little outer diameter greater than gas barrier chamber.The top platen and bottom platen is rectangular or square steel plate, square steel plate
Side length, rectangular steel plates width be greater than gas barrier chamber outer diameter.In order to facilitate smooth installation of the test suite in slotting,
The top platen and bottom platen can be formed by plurality of steel plates overlapping combinations.
In the technical solution of above-mentioned test macro, test specimen is cylindrical, and surface of test piece is sealed by plastic film wrapped, test specimen by
The coal and rock acquired from face of adopting is process.
In the technical solution of above-mentioned test macro, slotting, which is located at, adopts side at least 200m in front.
In the technical solution of above-mentioned test macro, sealing element, bottom are equipped between the lower end and bottom platen of gas barrier chamber
Cable through hole on portion's pressing plate and the sealing ring being equipped on sealing element, with loaded member across the cable of the cable through hole cooperate
Increase the airtightness of gas barrier chamber.
In the technical solution of above-mentioned test macro, the flat jack is the flat jack with pressure gauge.
In the technical solution of above-mentioned test macro, down-hole information acquisition station is the collected signal of equipment being attached thereto
It is transferred to ground monitoring station, and the equipment that the instruction that ground monitoring station issues is transferred to the component being attached thereto.Specifically, well
Lower information collection station be be attached thereto first pressure sensor, second pressure sensor, displacement acquisition device, stress acquisition
The collected signal of device, first flowmeter, second flowmeter is transferred to ground monitoring station, and the instruction that ground monitoring station is issued
It is transferred to the first pressure reducing valve being attached thereto, the second pressure reducing valve, the first valve, the second valve, third valve, the 4th valve and true
The equipment of sky pump.Down-hole information acquisition station can be underground ring exchanger, by by the control bus and information of test macro
Transfer bus integration, cable is connected on the ring exchanger of underground.It is preferred that the mine explosion-suppression and intrinsic safety type network switch is used, this
The network switch of seed type, which allows to be mounted on underground coal mine, to be had in coal dust and the hazardous gas environment of gas explosion, for making well
Under may be connected to the equipment of interchanger and ground carries out data exchange, realize long-range control and long-range monitoring.In ground monitoring station
The ground monitoring computer equipment that interchanger can be connected to underground be managed, network query function is realized by interchanger
Machine obtains the work of data information and control management to underground relevant device.
In order to reduce each pressure reducing valve of manual control, the unlatching of each valve, closing, the unlatching of opening degree and vacuum pump
With the labor intensity of closing, response time for shortening parameter adjustment, testing efficiency is improved, while reducing and manually adjusting error, on
It states in the technical solution of test macro, preferred technical solution are as follows:
First pressure reducing valve, the second pressure reducing valve are electronic pressure reducing valve, the first valve, the second valve, third valve and the 4th valve
Door is electrical ball valve, and the first pressure reducing valve, the second pressure reducing valve, the first valve, the second valve, third valve and the 4th valve are logical
It crosses cable to connect with ground monitoring computer, be opened and closed by ground monitoring computer long-distance control.Vacuum pump passes through line
Cable is connect with ground monitoring computer, is in operation or shape out of service by ground monitoring computer long-distance control vacuum pump
State.
In the technical solution of above-mentioned test macro, the different parts of coal and rock that can be square in face of adopting design multiple slottings simultaneously
Mounting test system, to realize the test specimen progress to different parts while measure.
The method for carrying out in-situ test using mechanical behavior and seepage characteristic of the above-mentioned test macro to coal and rock is as follows:
1. surface of test piece is sealed with plastic film wrapped from face scene coring production test specimen is adopted；
2. excavation slotting is helped in the coal mining for adopting face track lane of side at least 200m in face of adopting, by the top and bottom of slotting
With cement paste at horizontal plane, dry in the air to cement setting；
3. installing test suite in slotting, the air guiding through hole of loaded member is connected to air inlet pipeline, it will be in bottom platen
Air guiding through hole be connected to outlet pipe；
4. being loaded onto initial stress state and during follow-up test to test specimen with flat jack by adjusting flat very heavy
Top makes test specimen be in initial stress state always；The 4th valve, the first pressure reducing valve and the second pressure reducing valve are closed, the first valve is opened
Door, the second valve and third valve open vacuum pump and extract the gas in pipeline and gas barrier chamber out, be then shut off the first valve
Door, third valve, the 4th valve close vacuum pump later, open the first pressure reducing valve and the second pressure reducing valve into gas barrier chamber
It is passed through SF6Gas applies confining pressure to test specimen, is being passed through SF6The 4th valve is adjusted during gas to keep confining pressure condition；
5. being tested in mining active process, stress, axial position are acquired by stress collector and displacement acquisition device in real time
Meter and radial displacement data are moved, real-time Transmission is to ground monitoring station and records；
6. the data 5. acquired by analytical procedure, obtain the mechanical behavior and infiltration of coal and rock under the influence of true mining induced stress
Properties of flow data.
When being tested using above-mentioned test macro, why SF is used6It is because of SF as Gas seepage6It is a kind of nothing
Color, odorless, nontoxic, non-ignitable inert gas have excellent arc extinction performance and insulation performance, and it is raw to will not influence safety of coal mines
It produces.
When being tested using above-mentioned test macro, step 4. in confining pressure condition carried out according to actual test demand it is true
Fixed, for example, constant confining pressure can be remained, confining pressure can also be changed in a manner of incrementally increasing or reducing.
It is tested according to the method described above using above-mentioned test macro, coal and rock under the influence of true mining induced stress can be obtained
Mechanical behavior and seepage characteristic, the mechanics row data of the coal and rock be include: that distance adopts the advanced branch pressure-bearing of face different distance
The rock mechanics parameters such as power distribution, sample load-deformation curve, test specimen elasticity modulus and Poisson's ratio；The seepage characteristic number
According to including: stress-permeability relation curve etc..It is available in adopting face progradation by above-mentioned test method, it is adopted
The situation of change for influencing coal and rock permeability can also be obtained and be answered including peak strength, the corresponding strain of peak strength, axial direction
The mechanical characteristic number of coal and rock including change, hoop strain, body strain, residual strength, secant Young's modulus, secant Poisson's ratio etc.
According to, it is also possible to obtain the seepage characteristic data including the coal and rock permeability variation situation changed with stress state.
Compared with prior art, the utility model produces following beneficial technical effect:
1. the mechanical behavior and seepage characteristic in-situ test system of coal and rock provided by the utility model include gas source, vacuum
Pump, test suite, signal acquisition transmission assembly and ground monitoring station, it is in place due to that will be arranged including the test suite including test specimen
In slotting in face of adopt in the coal and rock of side, therefore the test system and test is coal and rock under the influence of true mining induced stress
Mechanical behavior and seepage characteristic, this design feature now has not available for laboratory testing rig, the survey of the utility model
Test system, which solves existing laboratory testing rig, cannot reflect the mechanical behavior and seepage flow of coal and rock under the influence of true mining induced stress
The deficiency of characteristic.The test result obtained by the test macro of the utility model, can more truely and accurately reflect seam mining
The seepage characteristic of coal and rock in the process, it is efficient for safeties of coal mines such as top coal presplitting in gas drainage, explosion-proof fluid barrier, top coal caving
Production provides more reliable, reference and is worth higher data.
2. the displacement meter that test macro provided by the utility model uses, stress are calculated as digitlization, automation collection, and first
Pressure reducing valve, the second pressure reducing valve are electronic pressure reducing valve, and the first valve, the second valve, third valve and the 4th valve are electrical ball valve,
Each pressure reducing valve and valve and vacuum pump can advantageously reduce so artificial behaviour by ground monitoring computer long-distance control
Control each pressure reducing valve, the unlatching of each valve, closing, the labor intensity of the opening and closing of opening degree and vacuum pump, shortening ginseng
The response time of number adjustment improves testing efficiency, and reduction manually adjusts error.
3. test macro provided by the utility model is simple and compact for structure, the numerous of complex large-sized loading system is avoided
It is trivial, manpower and material resources are saved, are conducive to promote and apply.
4. test macro provided by the utility model is used, it can be to the mechanics row of coal and rock under the influence of true mining induced stress
To carry out in-situ test with seepage characteristic, test process is one really to adopt dynamic process under the influence of lead abutment pressure
The nonlinear loading method of kind, is compared to traditional Experimental Method in Laboratory, more meets live practical.It is mentioned using the utility model
The test macro of confession carry out test can break through indoor scale testing experiment be difficult to restore live coal and rock crack develop and
The bottleneck of the in-situ mechanicals variation characteristic such as seepage characteristic can obtain the coal and rock mechanics parameter under true Disturbance stress path.
5. tested using test macro provided by the utility model, distance can be obtained adopt face different distance and prop up in advance
Rock mechanics parameters, the stress such as bearing capacity distribution, sample load-deformation curve, sample elasticity modulus and Poisson's ratio-permeability are closed
It is curve etc., is determination, the supporting intensity (array pitch etc. between advance support, anchor shaft anchor cable arrangement) of mash gas pumping drilling position
Adjusting, research of rock in-situ mechanical theory etc. provide research technique.
6. being tested using test macro provided by the utility model, the variation of coal petrography mining induced stress and seepage flow can be obtained
Characteristic obtains field disturbance mechanical property in geological environment locating for coal seam, can be mining rock theory of mechanics and field disturbance
Rock mass mechanics provides test method, provides new thinking for the coal seam antireflective effect evaluation in coal and gas power phenomenon engineering, is coal
Mine safety in production provides more accurate reference data.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of test macro described in the utility model；
Fig. 2 is test suite and its scheme of installation in slotting；
Fig. 3 is the structural schematic diagram of loading head；
Fig. 4 is arrangement schematic diagram of the slotting in coal and rock, and arrow, which refers to, in figure adopts face direction of propulsion；
In figure, 1-gas source, 2-vacuum pumps, 3-test suites, 4-ground monitoring stations, 5-top platens, 6-loads
Part, 6-1-loading head, 7-test specimens, 8-bottom platens, 9-anchor cable stress meters, 10-flat jacks, 11-gas barriers
Chamber, 12-sealing rings, 13-air guiding through holes, 14-cable through hole, 15-slottings, 16-axial displacement meters, 17-radial displacements
Meter, 18-displacement acquisition devices, 19-stress collectors, 20-down-hole information acquisition stations, the 21-the first pressure reducing valve, 22-the second
Pressure reducing valve, the 23-the first valve, the 24-the second valve, 25-third valves, the 26-the four valve, 27-first flowmeters,
28-second flowmeters, 29-first pressure sensors, 30-second pressure sensors.
Specific embodiment
By the following examples and in conjunction with attached drawing to the mechanical behavior and seepage characteristic of coal and rock provided by the utility model
In-situ test system and its application method are described further.It is necessary to note that following embodiment is served only for the utility model
It is described further, should not be understood as the limitation to scope of protection of the utility model, one of ordinary skill in the art are according to above-mentioned reality
With new content, some nonessential modifications and adaptations are made to the utility model and are embodied, utility model is still fallen within
The range of protection.
In following each embodiments, the flat jack used is the flat jack with pressure gauge；The anchor cable stress of use is calculated as
GPD450M type Mine-used I. S anchor pole (rope) strain gauge of Shandong Heng An Electronic Science and Technology Co., Ltd. production, peace mark number:
MFB130447, the stress collector carry pressure acquisition device, are mainly used for measuring anchor pole (rope) stress variation, can be used for this
Pressure measurement in utility model is automatically recorded with pressure signal；The axial displacement of use is calculated as 3542 profile shaft of U.S. Epsilon
To extensometer, suitable for the deformation measurement for being axially stretched, compressing, in the present invention for measure test specimen axial tension,
Compressive deformation, the radial displacement of use are calculated as U.S. Epsilon3544 type circumference extensometer, suitable for radial deformation measurement,
In the present invention for measuring the radial deformation of test specimen；The displacement acquisition device of use can be used for acquiring and recording displacement
The instrument of signal, such as can be digital signal conditioner.
Down-hole information acquisition station is that the collected signal of equipment being attached thereto is transferred to ground monitoring station, and ground
The equipment that the instruction that monitoring station issues is transferred to the component being attached thereto.Specifically, down-hole information acquisition station is that handle is attached thereto
First pressure sensor, second pressure sensor, displacement acquisition device, stress collector, first flowmeter, second flowmeter adopt
The signal collected is transferred to ground monitoring station, and the instruction that ground monitoring station issues is transferred to the first decompression being attached thereto
The equipment of valve, the second pressure reducing valve, the first valve, the second valve, third valve, the 4th valve and vacuum pump.In following embodiment,
Down-hole information acquisition station specifically refers to underground ring exchanger, by the way that the control bus of test macro and information transmission bus is whole
It closes, cable is connected on underground ring exchanger (for example, KJJ127 mine explosion-suppression and intrinsic safety type network switch), KJJ127 mine
Allowing to be mounted on underground coal mine with the Flameproof and intrinsically safe network switch has in coal dust and the hazardous gas environment of gas explosion, uses
To make, underground may be connected to the equipment of interchanger and ground progress data exchange, realization are remotely controlled and remotely monitored.Ground prison
The equipment that ground monitoring computer in control station can be connected to interchanger to underground is managed, and realizes net by interchanger
Network computer obtains the work of data information and control management to underground relevant device.
Embodiment 1
In the present embodiment, the mechanical behavior of coal and rock and structural schematic diagram such as Fig. 1 institute of seepage characteristic in-situ test system
Show, including gas source 1, vacuum pump 2, test suite 3, signal acquisition transmission assembly and ground monitoring station 4.
The test suite of the test suite 3 and its scheme of installation in slotting are as shown in Fig. 2, include top platen
5, loaded member 6, test specimen 7, bottom platen 8, anchor cable stress meter 9, flat jack 10, axial displacement meter, radial displacement meter and gas
Separate cavities 11.Top platen 5 and bottom platen 8 are the identical square steel plate of shape, and gas barrier chamber 11 is cylinder, load
The structural schematic diagram of part as shown in figure 3, loaded member 6 by cylindrical ontology and ontology one end cylindrical loading head 6-1 group
At the outer diameter of loading head is matched with the internal diameter of gas barrier chamber, and loading head is equipped with sealing ring 12, and loaded member is equipped with and is opened on
The air guiding through hole 13 of end surface and this body sidewall is loaded, bottom platen is equipped with air guiding through hole 13 and cable through hole 14, test specimen 7
Cylindrical, surface of test piece is sealed by plastic film wrapped, and test specimen is process by the coal and rock acquired from face of adopting.Top platen and
Bottom platen side length is the square steel plate of 300mm, and thickness is determined according to on-site actual situations, for convenience of installing, can do 1~3
Layer.The diameter of the piston rod of flat jack is greater than the diameter of the stress probe of anchor cable stress meter, and the size of bottom platen is greater than anchor
The side length of the size of the stress probe of rope stress meter, top platen and bottom platen is greater than the outer diameter of test specimen gas barrier chamber.
The test suite 3 is installed in the slotting 15 for being arranged in and in face of adopting in 200 meters of the coal and rock in side, and slotting is by mutual
The outer groove and inside groove of connection form, the domed structure of outer groove, and inside groove is in rectangular parallelepiped structure, in the inside groove of slotting from top to bottom successively
Flat jack 10, anchor cable stress meter 9, bottom platen 8, test specimen 7, loaded member 6 and top platen 5, flat jack 10 and top are installed
Portion's pressing plate 5 is contacted with the bottom surface of slotting inside groove and top surface respectively, and the bottom surface and top surface of slotting inside groove are horizontal plane, gas barrier chamber
11 lower end is bolted in bottom platen 8；The piston rod of flat jack, the stress probe of anchor cable stress meter, bottom
The axis of air guiding through hole, test specimen and loaded member on pressing plate is located along the same line, the center of top platen and bottom platen
Center and test specimen axis on the same line.
The sealing ring cooperation being equipped on sealing element, with loaded member between the lower end and bottom platen of gas barrier chamber increases gas
The airtightness of body separate cavities, test specimen 7 are placed vertically in gas barrier chamber 11, and the end face of loading head 6-1 contacts simultaneously with the top of test specimen 7
In gas barrier chamber 11, axial displacement meter 16 and radial displacement meter 17 are installed on test specimen 7, axial displacement meter 16 and diameter
The cable through hole 14 in bottom platen, which is passed through, to the cable of displacement meter 17 draws gas barrier chamber, the cable through hole in bottom platen
With across the cable of the cable through hole be equipped with sealing element, to increase the airtightness of gas barrier chamber.
The signal acquisition transmission assembly includes displacement acquisition device 18, stress collector 19 and down-hole information acquisition station 20,
Stress collector 19 is connect with anchor cable stress meter 9, and displacement acquisition device 18 connects with axial displacement meter 16 and radial displacement meter 17 respectively
It connects, displacement acquisition device 18 and stress collector 19 are connected by cable with down-hole information acquisition station 20；It wraps at the ground monitoring station 4
Include ground monitoring computer.
Gas source 1 is connected to through air inlet pipeline with gas barrier chamber 11, and gas barrier chamber 11 is through the air guiding through hole in bottom platen 8
13 are connected to outlet pipe, and gas source 1 is connect with one end of the first valve 23 and the second valve 24 respectively through the first pressure reducing valve 21,
The other end of first valve 23 is connect with vacuum pump 2, and the other end of the second valve 24 is through the second pressure reducing valve 22, first flowmeter 27
It is connected to the air guiding through hole 13 in loaded member 6, first pressure is equipped on the pipeline between first flowmeter 27 and loaded member 6 and is passed
Sensor 29, air inlet pipeline are equipped with the bye-pass at connection 22 both ends of the second pressure reducing valve, and bye-pass is equipped with third valve 25；Bottom
Air guiding through hole 13 on pressing plate is connect through the 4th valve 26 with second flowmeter 28, and the pipeline after second flowmeter 28 is equipped with
Second pressure sensor 30；First pressure sensor 29, second pressure sensor 30, first flowmeter 27 and second flowmeter 28
It is connect by cable with down-hole information acquisition station 20, down-hole information acquisition station 20 is connect by cable with ground monitoring computer.
First pressure reducing valve, the second pressure reducing valve are electronic pressure reducing valve, the first valve, the second valve, third valve and the 4th valve
Door is electrical ball valve, and the first pressure reducing valve, the second pressure reducing valve, the first valve, the second valve, third valve and the 4th valve are logical
It crosses cable to connect with ground monitoring computer, be opened and closed by ground monitoring computer long-distance control.Vacuum pump passes through line
Cable is connect with ground monitoring computer, is in operation or shape out of service by ground monitoring computer long-distance control vacuum pump
State.
Embodiment 2
The present embodiment is total, by taking the test macro that embodiment 1 provides as an example, illustrates using test provided by the utility model system
The method that the mechanical behavior and seepage characteristic of system coal and rock under the influence of true mining induced stress carry out in-situ test, including following step
It is rapid:
1. being taken from Shanxi Province with coal state electricity with northern three panels 8309 fully mechanized coal face (600m below the earth's surface) coring of Xin's coal mine
Damping packaging is carried out after core, is sent to ground and is processed into standard specimen.Coal seam sulphur content (St, d) average value of the working face exists
It is medium-high sulfur coal between 2.22%~2.39%, it is low-phosphorous, volatile matter is higher, calorific value is higher, based on half phaeism coal, pitch
Gloss, compact massive, part have lineation shape structure, accompany vitrain and bright coal slice band, containing shape bull's-eye of being scattered about like the stars, each coal
For the real density of layer coal generally in 1.6kg/L or so, apparent density is generally 1.45kg/L.According to national standard " coal and rock physics
Mechanical property measuring method " in pertinent regulations, be processed into 50 ± 2mm of diameter, the test specimen that ratio of height to diameter is 2 ± 0.2, test specimen two ends
Face nonparallelism is not more than 0.05mm, and test specimen upper and lower side diameter deviation is not more than 0.3mm, and surface of test piece is smooth, avoids because not advising
Then surface and the stress concentration phenomenon that generates, test specimen are sealed after processing with plastic film wrapped.
2. excavation slotting is helped in side 200m, the coal mining for adopting face track lane at bottom plate 1.5m in face of adopting, first excavate
One size is about the outer groove of high 800mm × wide 600mm domes, continues to open to coal and rock inner wall on the basis of outer groove
Dig the inside groove of a cuboid, the high 600mm of inside groove, width 500mm, depth 500mm, after the completion of slotting is excavated, to the wall surface of slotting
It polishes, makes it without obvious corner angle, the position of test suite is especially loaded, then by groove top in the bottom surface of slotting, slotting
Face cement paste dries in the air and condenses completely to cement at horizontal plane.
3. installing test suite in the inside groove of slotting, the air guiding through hole of loaded member is connected to air inlet pipeline, by bottom
Air guiding through hole on pressing plate is connected to outlet pipe.
4. being loaded onto initial stress state (i.e. local vertical stress value, if without crustal stress to test specimen with flat jack
Measured value is then estimated according to σ=γ z), 15MPa, flat jack are loaded onto test specimen using flat jack in the present embodiment
With pressure gauge, after loading initial pressure, single reading is recorded, valve is shut, to prevent release, observation is primary at regular intervals
The reading of the pressure gauge changes, if it find that pressure reduction should be replenished in time to initial pressure state.Close the 4th valve, first
Pressure reducing valve and the second pressure reducing valve open the first valve, the second valve and third valve, open vacuum pump and vacuumize 30min, will manage
Gas extraction in road and gas barrier chamber, is then shut off the first valve, third valve, the 4th valve, closes vacuum pump later,
It opens the first pressure reducing valve and the second pressure reducing valve is passed through SF into gas barrier chamber6Gas applies the confining pressure of 2MPa to test specimen, logical
Enter SF6During adjust the 4th valve to keep the confining pressure condition.First pressure reducing valve, the second pressure reducing valve, the first valve,
Two valves and the 4th valve are opened and closed by the monitoring computer long-distance control at ground monitoring station.
5. being tested in mining active process, stress, axial position are acquired by stress collector and displacement acquisition device in real time
Meter and radial displacement data are moved, real-time Transmission is to ground monitoring station and records；In mining active process, need to pass through according to test
The ground monitoring computer remote at ground monitoring station adjusts the first pressure reducing valve, the second valve, the second pressure reducing valve and the 4th valve
Opening degree adjusts confining pressure.
When the face of adopting is pushed into slotting position, test specimen deforms destruction, and test process terminates.
6. the data 5. acquired by analytical procedure, obtain the mechanical behavior and infiltration of coal and rock under the influence of true mining induced stress
Properties of flow data.
By taking 5. the middle data acquired calculate the permeability for obtaining different moments according to step as an example, illustrates to obtain and really adopt
The method of the seepage characteristic data of coal and rock under stress influence.Assuming that entire test process is constant temperature process, and meet ideal gas
Body state equation can calculate the permeability of different moments, such as according to compressible gas horizontal linearity steady seepage Darcy formula
Under:
In above formula, K is permeability, m2；Q is SF6The flow of gas, m3/s；p0For the atmospheric pressure of test site, with locality
Subject to actual measurement；μ is SF6Viscosity coefficient in test temperature；A is the cross-sectional area of test specimen, m2；L is the length of test specimen, m；p1、
p2The respectively pressure that measures of first pressure sensor and second pressure sensor, MPa.
Claims (9)
1. the mechanical behavior and seepage characteristic in-situ test system of coal and rock, including gas source (1), vacuum pump (2), feature exists
In, it further include test suite (3), signal acquisition transmission assembly and ground monitoring station (4),
The test suite (3) includes top platen (5), loaded member (6), test specimen (7), bottom platen (8), anchor cable stress meter
(9), flat jack (10), axial displacement meter (16), radial displacement meter (17) and gas separate cavities (11), gas barrier chamber (11)
For cylinder, one end of loaded member (6) is cylindrical loading head (6-1), the outer diameter of loading head and the internal diameter of gas barrier chamber
Matching, loading head are equipped with sealing ring (12), and loaded member is logical equipped with the air guide for being opened on load end surface and loaded member side wall
Hole (13), bottom platen are equipped with air guiding through hole (13) and cable through hole (14)；
The test suite (3) is installed in the slotting (15) for being arranged in and in face of adopting in square coal and rock, in slotting from top to bottom
Flat jack (10), anchor cable stress meter (9), bottom platen (8), test specimen (7), loaded member (6) and top platen are successively installed
(5), flat jack (10) and top platen (5) are contacted with the bottom surface of slotting and top surface respectively, slotting and flat jack and top
The position of pressing plate contact is horizontal plane, and the lower end of gas barrier chamber (11) is fixed on bottom platen (8), test specimen (7) place vertically in
In gas barrier chamber (11), the end face of loading head (6-1) contacts with the top of test specimen (7) and is located in gas barrier chamber (11),
Axial displacement meter (16) and radial displacement meter (17) are installed on test specimen (7), axial displacement meter (16) and radial displacement meter
(17) cable passes through the cable through hole (14) in bottom platen and draws gas barrier chamber；
The signal acquisition transmission assembly includes displacement acquisition device (18), stress collector (19) and down-hole information acquisition station
(20), stress collector (19) is connect with anchor cable stress meter (9), displacement acquisition device (18) respectively with axial displacement meter (16) and diameter
It is connected to displacement meter (17), displacement acquisition device (18) and stress collector (19) pass through cable and down-hole information acquisition station (20) phase
Even；The ground monitoring station (4) includes ground monitoring computer；
Gas source (1) is connected to through air inlet pipeline with gas barrier chamber (11), and gas barrier chamber (11) is through the air guide on bottom platen (8)
Through-hole (13) is connected to outlet pipe, gas source (1) through the first pressure reducing valve (21) respectively with the first valve (23) and the second valve
(24) one end connection, the other end of the first valve (23) are connect with vacuum pump (2), and the other end of the second valve (24) is through second
Pressure reducing valve (22), first flowmeter (27) are connected to the air guiding through hole (13) on loaded member (6), in first flowmeter (27) and are added
Pipeline between holder (6) is equipped with first pressure sensor (29), and air inlet pipeline is equipped with the second pressure reducing valve (22) two of connection
The bye-pass at end, bye-pass are equipped with third valve (25)；Air guiding through hole (13) in bottom platen through the 4th valve (26) with
Second flowmeter (28) connects, and the pipeline after second flowmeter (28) is equipped with second pressure sensor (30)；First pressure
Sensor (29), second pressure sensor (30), first flowmeter (27) and second flowmeter (28) are believed by cable and underground
Acquisition station (20) connection is ceased, down-hole information acquisition station (20) is connect by cable with ground monitoring computer.
2. the mechanical behavior of coal and rock and seepage characteristic in-situ test system according to claim 1, which is characterized in that flat thousand
The axis position of the piston rod on jin top, the stress probe of anchor cable stress meter, the air guiding through hole in bottom platen, test specimen and loaded member
In on same straight line.
3. the mechanical behavior of coal and rock and seepage characteristic in-situ test system according to claim 2, which is characterized in that flat thousand
The diameter of the piston rod on jin top is greater than the diameter of the stress probe of anchor cable stress meter, and the size of bottom platen is greater than anchor cable stress meter
Stress probe size, the size of top platen and bottom platen is greater than the outer diameter of gas barrier chamber.
4. according to claim 1 to the mechanical behavior of coal and rock described in any one of 3 claims and seepage characteristic in-situ test
System, which is characterized in that test specimen is cylindrical, and surface of test piece is sealed by plastic film wrapped, test specimen by from adopt face acquire coal petrography
Body is process.
5. according to claim 1 to the mechanical behavior of coal and rock described in any one of 3 claims and seepage characteristic in-situ test
System, which is characterized in that slotting, which is located at, adopts side at least 200m in front.
6. according to claim 1 to the mechanical behavior of coal and rock described in any one of 3 claims and seepage characteristic in-situ test
System, which is characterized in that sealing element is equipped between the lower end and bottom platen of gas barrier chamber.
7. according to claim 1 to the mechanical behavior of coal and rock described in any one of 3 claims and seepage characteristic in-situ test
System, which is characterized in that cable through hole in bottom platen and sealing element is equipped with across the cable of the cable through hole.
8. according to claim 1 to the mechanical behavior of coal and rock described in any one of 3 claims and seepage characteristic in-situ test
System, which is characterized in that the first pressure reducing valve, the second pressure reducing valve are electronic pressure reducing valve, the first valve, the second valve, third valve
It is electrical ball valve, the first pressure reducing valve, the second pressure reducing valve, the first valve, the second valve, third valve and the 4th with the 4th valve
Valve passes through cable and connect with ground monitoring computer, is opened and closed by ground monitoring computer long-distance control.
9. the mechanical behavior of coal and rock and seepage characteristic in-situ test system according to claim 8, which is characterized in that vacuum
Pump is connect by cable with ground monitoring computer, is in operation by ground monitoring computer long-distance control vacuum pump or is stopped
The state of operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822272974.1U CN209432604U (en) | 2018-12-29 | 2018-12-29 | The mechanical behavior and seepage characteristic in-situ test system of coal and rock |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459313A (en) * | 2018-12-29 | 2019-03-12 | 四川大学 | The mechanical behavior and seepage characteristic home position testing method and system of coal and rock under the influence of true mining induced stress |
| CN112434417A (en) * | 2020-11-20 | 2021-03-02 | 哈尔滨汽轮机厂有限责任公司 | Intelligent calculation method for strength of sleeve of steam turbine valve |
-
2018
- 2018-12-29 CN CN201822272974.1U patent/CN209432604U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459313A (en) * | 2018-12-29 | 2019-03-12 | 四川大学 | The mechanical behavior and seepage characteristic home position testing method and system of coal and rock under the influence of true mining induced stress |
| CN109459313B (en) * | 2018-12-29 | 2023-09-01 | 四川大学 | In-situ test method and system for mechanical behavior and seepage characteristics of coal rock mass |
| CN112434417A (en) * | 2020-11-20 | 2021-03-02 | 哈尔滨汽轮机厂有限责任公司 | Intelligent calculation method for strength of sleeve of steam turbine valve |
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