CN106885740A - A kind of coal and rock Creep Mechanics behavior test device under the loading based on true triaxial - Google Patents
A kind of coal and rock Creep Mechanics behavior test device under the loading based on true triaxial Download PDFInfo
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- CN106885740A CN106885740A CN201710216110.5A CN201710216110A CN106885740A CN 106885740 A CN106885740 A CN 106885740A CN 201710216110 A CN201710216110 A CN 201710216110A CN 106885740 A CN106885740 A CN 106885740A
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- 239000003245 coal Substances 0.000 title claims abstract description 44
- 239000011435 rock Substances 0.000 title claims abstract description 42
- 238000012360 testing method Methods 0.000 title claims abstract description 18
- 239000002828 fuel tank Substances 0.000 claims abstract description 17
- 230000007774 longterm Effects 0.000 claims abstract description 16
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 76
- 238000007789 sealing Methods 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 239000000295 fuel oil Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000003542 behavioural effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A kind of coal and rock Creep Mechanics behavior test device under loading based on true triaxial, including pressure chamber, four levels and a vertical stress load cylinder and the long-term voltage stabilizing oil supply system of load cylinder；Pressure chamber's side wall is provided with four horizontal stress loading hole, and base plate is provided with vertical stress loading hole, and top board is provided with sample handling by hole and detachable-type sealed cover plate；Stress loading depression bar is respectively arranged with each stress loading hole；Depression bar is inner and seal cover board lower surface is respectively arranged with pressure head, and strain gauge is housed between stress loading depression bar and cylinder piston rod；Equipped with the cylinder that is rigidly connected between cylinder block and pressure chamber's outer wall, grating sensor is housed between depression bar and the cylinder that is rigidly connected；Pressure head sets some groups according to different size；The long-term voltage-stabilizing system of load cylinder includes fuel tank, oil pump, check valve, overflow valve, three solenoid directional control valves, three vacuum tanks, three pressure-compensated valves and three choke valves, and whole oil cylinders pass through the long-term voltage-stabilizing system fuel feeding of load cylinder.
Description
Technical field
The invention belongs to mechanical test technical field in coal and rock room, under more particularly to a kind of loading based on true triaxial
Coal and rock Creep Mechanics behavior test device.
Background technology
The creep properties of coal and rock is always the important references of geotechnical engineering design and construction, and coal and rock is in stand under load creep
During mechanical behavior Evolution also be always rock mechanics field study hotspot, particularly there occurs in recent years many
Secondary retarded type bump accident, is mainly shown as tunnel after excavation, can be lost in the case where time-space is delayed
Surely, so induce coal and rock dynamic disaster, so as to cause substantial amounts of casualties and property loss.
In recent years, as coal industry formally enters the deep mining stage, by deep " three disturbances high " effect, impact
The occurrence frequency of ground pressure accident also shows obvious ascendant trend, therefore, by under deep " three disturbances high " effect
Coal and rock carries out Creep Mechanics behavioral study, analyzes its temporal and spatial evolution, and technical staff can be helped to understand deep coal and rock
Catastrophe breed mechanism, and set up corresponding coal and rock catastrophe judgement and Prevention Technique, the safe working to realizing deep coal
With important scientific meaning and construction value.
But, it is desirable to realize above-mentioned target, it usually needs carry out mechanical test in coal and rock room, and the coal petrography for using at present
Body Creep Mechanics row experimental rig also rests on normal triaxial load phase mostly, it is difficult to simulate the true preservation shape of coal and rock
State, and the coal and rock Creep Mechanics behavior evolution rule obtained by testing also is difficult to reflect actual conditions.
Therefore, need badly and develop a kind of coal and rock Creep Mechanics behavior test device that disclosure satisfy that true triaxial loading environment,
It should possess following four condition：1., possesses the ability for individually applying the three-dimensional load such as not；2., possesses applying three steady in a long-term
To the ability of the load such as not；3., possessing makes coal and rock be in high pressure fluid environment and be monitored record to pressure change
Ability；4., possess carries out long term monitoring record to the stress and strain parameter that coal and rock is produced in true triaxial loading procedure
Ability.
The content of the invention
For the problem that prior art is present, the present invention provides the coal and rock Creep Mechanics under a kind of loading based on true triaxial
Behavior test device, possesses the ability for individually applying the three-dimensional load such as not, possesses the energy for applying the three-dimensional load such as not steady in a long-term
Power, possessing makes coal and rock be in high pressure fluid environment and the ability of record is monitored to pressure change, possesses to coal and rock
The stress and strain parameter produced in true triaxial loading procedure carries out the ability of long term monitoring record, the coal as obtained by experiment
Rock mass creep mechanical behavior Evolution can preferably reflect actual conditions, for the prediction preventing and treating of Deep Mine dynamic disaster is provided
Theoretical foundation and Engineering Guidance.
To achieve these goals, the present invention is adopted the following technical scheme that：A kind of coal and rock under the loading based on true triaxial
Creep Mechanics behavior test device, including pressure chamber, first level stress loading oil cylinder, the second horizontal stress load cylinder,
3rd horizontal stress load cylinder, the 4th horizontal stress load cylinder, vertical stress load cylinder and the long-term voltage stabilizing of load cylinder
Oil supply system；
The pressure chamber uses square structure, and first level stress is offered respectively on four side walls of pressure chamber
Loading hole, the second horizontal stress loading hole, the 3rd horizontal stress loading hole and the 4th horizontal stress loading hole, in pressure chamber
Vertical stress loading hole is offered on base plate, sample handling are offered on the top board of pressure chamber by hole, sample handling are logical
Detachable-type sealed cover plate is installed on via, fluid fillers hole is offered on the side wall of pressure chamber；
First level stress loading depression bar, first level stress loading are installed in the first level stress loading hole
Depression bar is slidably matched with the sealing of first level stress loading hole, the piston rod and the first water of the first level stress loading oil cylinder
The outer end of horizontal stress loading depression bar is fixedly connected with, and first level stress loading oil cylinder is mutually solid with the outer wall of pressure chamber by cylinder body
Even；
Second horizontal stress loading depression bar, the loading of the second horizontal stress are installed in the second horizontal stress loading hole
Depression bar is slidably matched with the sealing of the second horizontal stress loading hole, the piston rod and the second water of the second horizontal stress load cylinder
The outer end of horizontal stress loading depression bar is fixedly connected with, and the second horizontal stress load cylinder is mutually solid with the outer wall of pressure chamber by cylinder body
Even；
3rd horizontal stress loading depression bar, the loading of the 3rd horizontal stress are installed in the 3rd horizontal stress loading hole
Depression bar is slidably matched with the sealing of the 3rd horizontal stress loading hole, the piston rod and the 3rd water of the 3rd horizontal stress load cylinder
The outer end of horizontal stress loading depression bar is fixedly connected with, and the 3rd horizontal stress load cylinder is mutually solid with the outer wall of pressure chamber by cylinder body
Even；
4th horizontal stress loading depression bar, the loading of the 4th horizontal stress are installed in the 4th horizontal stress loading hole
Depression bar is slidably matched with the sealing of the 4th horizontal stress loading hole, the piston rod and the 4th water of the 4th horizontal stress load cylinder
The outer end of horizontal stress loading depression bar is fixedly connected with, and the 4th horizontal stress load cylinder is mutually solid with the outer wall of pressure chamber by cylinder body
Even；
Vertical stress loading depression bar is installed in the vertical stress loading hole, vertical stress loads depression bar and vertically should
The sealing of power loading hole is slidably matched, and the piston rod of the vertical stress load cylinder is mutually solid with the outer end of vertical stress loading depression bar
Even, vertical stress load cylinder is fixedly connected with by cylinder body with the outer wall of pressure chamber；
In the inner of the first level stress loading depression bar, inner, the 3rd level of the second horizontal stress loading depression bar
The inner of stress loading depression bar, the inner of the 4th horizontal stress loading depression bar, vertical stress load the inner and detachable of depression bar
The lower surface of formula seal cover board is mounted on pressure head；
Between the piston rod of the first level stress loading depression bar and first level stress loading oil cylinder, the second level
Between the piston rod of stress loading depression bar and the second horizontal stress load cylinder, the 3rd horizontal stress loading depression bar and the 3rd level
Between the piston rod of stress loading oil cylinder, the 4th horizontal stress loading depression bar and the 4th horizontal stress load cylinder piston rod it
Between, vertical stress loading depression bar and the piston rod of vertical stress load cylinder between add strain gauge；
The long-term voltage-stabilizing system of load cylinder includes fuel tank, oil pump, check valve, overflow valve, the first solenoid directional control valve, the
Two solenoid directional control valves, the 3rd solenoid directional control valve, the first vacuum tank, the second vacuum tank, the 3rd vacuum tank, first pressure recuperation valve,
Second pressure recuperation valve, the 3rd pressure-compensated valve, first throttle valve, second throttle and the 3rd choke valve；
The oil pump oil inlet is connected with fuel tank, and oil pump oil-out is connected with check valve oil inlet, and check valve is fuel-displaced
Mouth is divided into the output of four tunnels, and the first via is connected by overflow valve with fuel tank, and the second tunnel passes through the first solenoid directional control valve while with the
One horizontal stress load cylinder and the second horizontal stress load cylinder are connected, the 3rd tunnel by the second solenoid directional control valve simultaneously with
3rd horizontal stress load cylinder and the 4th horizontal stress load cylinder are connected, and the 4th tunnel passes through the 3rd solenoid directional control valve and erects
Normal stress load cylinder is connected；
The first pressure recuperation valve oil inlet end turns on first level stress loading oil cylinder and the loading of the second horizontal stress
On pipeline between oil cylinder rodless cavity and the first solenoid directional control valve, first pressure recuperation valve oil outlet end is by first throttle valve and oil
Case is connected, and first vacuum tank is arranged on first pressure recuperation valve oil inlet end pipeline；
The second pressure recuperation valve oil inlet end turns on the 3rd horizontal stress load cylinder and the loading of the 4th horizontal stress
On pipeline between oil cylinder rodless cavity and the second solenoid directional control valve, second pressure recuperation valve oil outlet end is by second throttle and oil
Case is connected, and second vacuum tank is arranged on second pressure recuperation valve oil inlet end pipeline；
The 3rd pressure-compensated valve oil inlet end turns on vertical stress load cylinder rodless cavity and the 3rd solenoid directional control valve
Between pipeline on, the 3rd pressure-compensated valve oil outlet end is connected by the 3rd choke valve with fuel tank, second vacuum tank peace
On the 3rd pressure-compensated valve oil inlet end pipeline.
The first level stress loading oil cylinder, the second horizontal stress load cylinder, the 3rd horizontal stress load cylinder,
Rigidity is mounted between four horizontal stress load cylinders and the cylinder body of vertical stress load cylinder and the outer wall of pressure chamber to connect
Connect cylinder, the first level stress loading depression bar, the second horizontal stress loading depression bar, the 3rd horizontal stress loading depression bar, the 4th
Horizontal stress to be loaded and be mounted on grating sensing between depression bar and vertical stress loading depression bar and each self-corresponding cylinder that is rigidly connected
Device, is measured by grating sensor to the displacement that each horizontal stress loads depression bar.
Described to be rigidly connected between cylinder and the outer wall of pressure chamber using two-stage connected mode, be rigidly connected a connection end tool
There is external screw thread, and carry out the threaded connection of the first order with the outer wall of pressure chamber by external screw thread, in the rigidity of male ends
Ring flange is provided with connecting cylinder, and carries out the bolt connection of the second level with the outer wall of pressure chamber by ring flange.
The pressure head is provided with some groups according to different size, for being adapted to various sizes of coal and rock sample.
Beneficial effects of the present invention：
The present invention compared with prior art, possesses the ability for individually applying the three-dimensional load such as not, possesses applying steady in a long-term
The ability of the three-dimensional load such as not, possessing makes coal and rock be in high pressure fluid environment and the energy of record is monitored to pressure change
Power, possesses the ability that long term monitoring record is carried out to the stress and strain parameter that coal and rock is produced in true triaxial loading procedure,
Coal and rock Creep Mechanics behavior evolution rule as obtained by experiment can preferably reflect actual conditions, be Deep Mine power
Hazard prediction preventing and treating provides theoretical foundation and Engineering Guidance.
Brief description of the drawings
Fig. 1 is the coal and rock Creep Mechanics behavior test device forward direction section view under a kind of loading based on true triaxial of the invention
Figure；
Fig. 2 is that the coal and rock Creep Mechanics behavior test device under a kind of loading based on true triaxial of the invention is bowed to section view
Figure；
Fig. 3 is pressure chamber of the invention forward direction sectional view；
Fig. 4 bows to sectional view for pressure chamber of the invention；
Fig. 5 is the long-term voltage stabilizing oil supply system schematic diagram of load cylinder of the invention；
In figure, 1-pressure chamber, 2-first level stress loading oil cylinder, the 3-the second horizontal stress load cylinder, 4-
3rd horizontal stress load cylinder, the 5-the four horizontal stress load cylinder, 6-vertical stress load cylinder, 7-first level
Stress loading hole, the 8-the second horizontal stress loading hole, the 9-the three horizontal stress loading hole, the loading of the 10-the four horizontal stress
Hole, 11-vertical stress loading hole, by hole, 13-detachable-type sealed cover plate, 14-first level should for the handling of 12-sample
Power loads depression bar, the 15-the second horizontal stress loading depression bar, the 16-the three horizontal stress loading depression bar, the 17-the four horizontal stress
Loading depression bar, 18-vertical stress loading depression bar, 19-fluid fillers hole, 20-pressure head, 21-strain gauge, 22-oil
Case, 23-oil pump, 24-check valve, 25-overflow valve, the 26-the first solenoid directional control valve, the 27-the second solenoid directional control valve, 28-
3rd solenoid directional control valve, the 29-the first vacuum tank, the 30-the second vacuum tank, the 31-the three vacuum tank, the compensation of 32-first pressure
Valve, 33-second pressure recuperation valve, the 34-the three pressure-compensated valve, 35-first throttle valve, 36-second throttle, 37-the
Three choke valves, 38-be rigidly connected cylinder.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in Fig. 1~5, the coal and rock Creep Mechanics behavior test device under a kind of loading based on true triaxial, including pressure
Power chamber 1, first level stress loading oil cylinder 2, the second horizontal stress load cylinder 3, the 3rd horizontal stress load cylinder 4,
Four horizontal stress load cylinders 5, vertical stress load cylinder 6 and the long-term voltage stabilizing oil supply system of load cylinder；
The pressure chamber 1 uses square structure, and offering first level respectively on four side walls of pressure chamber 1 should
Power loading hole 7, the second horizontal stress loading hole 8, the 3rd horizontal stress loading hole 9 and the 4th horizontal stress loading hole 10, in pressure
Vertical stress loading hole 11 is offered on the base plate of power chamber 1, sample handling are offered on the top board of pressure chamber by hole
12, by being provided with detachable-type sealed cover plate 13 on hole 12, offering fluid on the side wall of pressure chamber 1 fills for sample handling
Dress hole 19；
First level stress loading depression bar 14, first level stress are installed in the first level stress loading hole 7
Loading depression bar 14 is slidably matched with the sealing of first level stress loading hole 7, the piston rod of the first level stress loading oil cylinder 2
Outer end with first level stress loading depression bar 14 is fixedly connected with, and first level stress loading oil cylinder 2 is by cylinder body and pressure chamber 1
Outer wall be fixedly connected with；
Second horizontal stress loading depression bar 15, the second horizontal stress are installed in the second horizontal stress loading hole 8
Loading depression bar 15 is slidably matched with the sealing of the second horizontal stress loading hole 8, the piston rod of the second horizontal stress load cylinder 3
Outer end with the second horizontal stress loading depression bar 15 is fixedly connected with, and the second horizontal stress load cylinder 3 is by cylinder body and pressure chamber 1
Outer wall be fixedly connected with；
3rd horizontal stress loading depression bar 16, the 3rd horizontal stress are installed in the 3rd horizontal stress loading hole 9
Loading depression bar 16 is slidably matched with the sealing of the 3rd horizontal stress loading hole 9, the piston rod of the 3rd horizontal stress load cylinder 4
Outer end with the 3rd horizontal stress loading depression bar 16 is fixedly connected with, and the 3rd horizontal stress load cylinder 4 is by cylinder body and pressure chamber 1
Outer wall be fixedly connected with；
4th horizontal stress loading depression bar 17, the 4th horizontal stress are installed in the 4th horizontal stress loading hole 10
Loading depression bar 17 is slidably matched with the sealing of the 4th horizontal stress loading hole 10, the piston of the 4th horizontal stress load cylinder 5
Bar is fixedly connected with the outer end of the 4th horizontal stress loading depression bar 17, and the 4th horizontal stress load cylinder 5 passes through cylinder body and pressure chamber
The outer wall of room 1 is fixedly connected with；
Vertical stress loading depression bar 18 is installed in the vertical stress loading hole 11, vertical stress loading depression bar 18 with
The sealing of vertical stress loading hole 11 is slidably matched, and piston rod and the vertical stress of the vertical stress load cylinder 6 load depression bar
18 outer end is fixedly connected with, and vertical stress load cylinder 6 is fixedly connected with by cylinder body with the outer wall of pressure chamber 1；
In the inner of the first level stress loading depression bar 14, the inner, the 3rd of the second horizontal stress loading depression bar 15
The inner of horizontal stress loading depression bar 16, the inner of the 4th horizontal stress loading depression bar 17, vertical stress load the interior of depression bar 18
The lower surface of end and detachable-type sealed cover plate 13 is mounted on pressure head 20；
Between the first level stress loading depression bar 14 and the piston rod of first level stress loading oil cylinder 2, second
Horizontal stress loading the horizontal stress load cylinder 3 of depression bar 15 and second piston rod between, the 3rd horizontal stress loading depression bar 16
And the piston rod of the 3rd horizontal stress load cylinder 4 between, loading depression bar 17 and the 4th horizontal stress loading of the 4th horizontal stress
Between the piston rod of oil cylinder 5, being added between vertical stress loading depression bar 18 and the piston rod of vertical stress load cylinder 6 should
Force snesor 21；
The long-term voltage-stabilizing system of load cylinder includes fuel tank 22, oil pump 23, check valve 24, overflow valve 25, the first electromagnetism
Reversal valve 26, the second solenoid directional control valve 27, the 3rd solenoid directional control valve 28, the first vacuum tank 29, the second vacuum tank 30, the 3rd voltage stabilizing
Tank 31, first pressure recuperation valve 32, second pressure recuperation valve 33, the 3rd pressure-compensated valve 34, first throttle valve 35, second throttle
The choke valve 37 of valve 36 and the 3rd；
The oil inlet of the oil pump 23 is connected with fuel tank 22, and the oil-out of oil pump 23 is connected with the oil inlet of check valve 24, single
It is divided into four tunnels to the oil-out of valve 24 to export, the first via is connected by overflow valve 25 with fuel tank 22, the second tunnel passes through the first electromagnetism
Reversal valve 26 is connected with first level stress loading oil cylinder 2 and the second horizontal stress load cylinder 3 simultaneously, and the 3rd tunnel is by the
Two solenoid directional control valves 27 are connected with the 3rd horizontal stress load cylinder 4 and the 4th horizontal stress load cylinder 5 simultaneously, the 4th tunnel
It is connected with vertical stress load cylinder 6 by the 3rd solenoid directional control valve 28；
The oil inlet end of first pressure recuperation valve 32 turns on first level stress loading oil cylinder 2 and the second horizontal stress adds
Carry on the pipeline between the rodless cavity of oil cylinder 3 and the first solenoid directional control valve 26, the oil outlet end of first pressure recuperation valve 32 passes through first segment
Stream valve 35 is connected with fuel tank 22, and first vacuum tank 29 is arranged on the oil inlet end pipeline of first pressure recuperation valve 32；
The oil inlet end of second pressure recuperation valve 33 turns on the 3rd horizontal stress load cylinder 4 and the 4th horizontal stress adds
Carry on the pipeline between the rodless cavity of oil cylinder 5 and the second solenoid directional control valve 27, the oil outlet end of second pressure recuperation valve 33 passes through second section
Stream valve 36 is connected with fuel tank 22, and second vacuum tank 30 is arranged on the oil inlet end pipeline of second pressure recuperation valve 33；
The oil inlet end of 3rd pressure-compensated valve 34 turns on the rodless cavity of vertical stress load cylinder 6 and the 3rd electromagnetic switch
On pipeline between valve 28, the oil outlet end of the 3rd pressure-compensated valve 34 is connected by the 3rd choke valve 37 with fuel tank 22, and described
Two vacuum tanks 30 are arranged on the oil inlet end pipeline of the 3rd pressure-compensated valve 34.
The first level stress loading oil cylinder 2, the second horizontal stress load cylinder 3, the 3rd horizontal stress load cylinder
4th, it is mounted between the outer wall of the cylinder body and pressure chamber 1 of the 4th horizontal stress load cylinder 5 and vertical stress load cylinder 6
Be rigidly connected cylinder 38, and the first level stress loading depression bar 14, the second horizontal stress loading depression bar 15, the 3rd horizontal stress add
Carry depression bar 16, the 4th horizontal stress loading depression bar 17 and vertical stress loading depression bar 18 with it is each it is self-corresponding be rigidly connected cylinder 38 it
Between be mounted on grating sensor, by grating sensor to each horizontal stress load depression bar displacement measure.
Described to be rigidly connected between cylinder 38 and the outer wall of pressure chamber 1 using two-stage connected mode, the cylinder 38 that is rigidly connected connects
Connecing end has external screw thread, and carries out the threaded connection of the first order with the outer wall of pressure chamber 1 by external screw thread, in male ends
The cylinder 38 that is rigidly connected on be provided with ring flange, and connected by the bolt that the outer wall of ring flange and pressure chamber 1 carries out the second level
Connect.
The pressure head 20 is provided with some groups according to different size, for being adapted to various sizes of coal and rock sample.
First use process of the invention is illustrated below in conjunction with the accompanying drawings：
In the present embodiment, first level stress loading oil cylinder 2, the second horizontal stress load cylinder 3, the 3rd horizontal stress add
Carrying the horizontal stress load cylinder 5 of oil cylinder 4 and the 4th uses 600kN hydraulic jacks, vertical stress load cylinder 6 to use 1300kN
Hydraulic jack.Pressure head 20 sets two groups, and the first packet size specification is 50mm × 50mm and 50mm × 100mm, the second packet size rule
Lattice are 100mm × 100mm.
The pressure head 20 that will first choose is respectively installed to corresponding horizontal stress loading depression bar and detachable-type sealed cover plate 13
On, then coal and rock sample is sent into pressure chamber 1 by sample handling by hole 12, first level stress is then passed through respectively
The horizontal stress load cylinder 4 of load cylinder 2 and the 3rd coordinates, the second horizontal stress load cylinder 3 and the 4th horizontal stress are loaded
Oil cylinder 5 coordinates the preliminary centering for completing coal and rock sample to clamp, and displacement transducer is installed between coal and rock sample and pressure head 20,
Then detachable-type sealed cover plate 13 is installed onto sample handling by hole 12, completing the sealing of pressure chamber 1.
Control vertical stress load cylinder 6 is acted, until the precise alignment for completing coal and rock sample is clamped, according still further to target
Load is loaded to coal and rock sample, after waiting target load loaded, is noted in pressure chamber 1 by fluid fillers hole 19
Enter fluid, untill fluid environment pressure reaches setting value, while carrying out real-time monitoring to fluid environmental pressure.
Multistage stress loading creep test is proceeded by, strain parameter is monitored by displacement transducer, until every one-level should
Strain parameter under power load is less than 0.01%/day, can carry out the stress loading of next stage, repeats loading procedure, Zhi Daomei
Rock mass sample is destroyed and after losing bearing capacity, terminates experiment, and supplemental characteristic to collecting carries out record storage.Afterwards,
The fluid in pressure chamber 1 is first shed, then sheds stress loading, then unload detachable-type sealed cover plate 13, finally by coal petrography
Body sample is taken out, you can preparation is tested next time.
Scheme in embodiment and being not used to limits scope of patent protection of the invention, it is all without departing from carried out by the present invention etc.
Effect is implemented or is changed, and is both contained in the scope of the claims of this case.
Claims (4)
1. it is a kind of based on true triaxial loading under coal and rock Creep Mechanics behavior test device, it is characterised in that：Including pressure chamber
Room, first level stress loading oil cylinder, the second horizontal stress load cylinder, the 3rd horizontal stress load cylinder, the 4th level are answered
Power load cylinder, vertical stress load cylinder and the long-term voltage stabilizing oil supply system of load cylinder；
The pressure chamber uses square structure, and first level stress loading is offered respectively on four side walls of pressure chamber
Hole, the second horizontal stress loading hole, the 3rd horizontal stress loading hole and the 4th horizontal stress loading hole, in the base plate of pressure chamber
On offer vertical stress loading hole, sample handling are offered on the top board of pressure chamber by hole, sample handling pass through hole
On detachable-type sealed cover plate is installed, offer fluid fillers hole on the side wall of pressure chamber；
First level stress loading depression bar, first level stress loading depression bar are installed in the first level stress loading hole
It is slidably matched with the sealing of first level stress loading hole, piston rod and the first level of the first level stress loading oil cylinder should
The outer end of power loading depression bar is fixedly connected with, and first level stress loading oil cylinder is fixedly connected with by cylinder body with the outer wall of pressure chamber；
Second horizontal stress loading depression bar, the second horizontal stress loading depression bar are installed in the second horizontal stress loading hole
It is slidably matched with the sealing of the second horizontal stress loading hole, the piston rod and the second level of the second horizontal stress load cylinder should
The outer end of power loading depression bar is fixedly connected with, and the second horizontal stress load cylinder is fixedly connected with by cylinder body with the outer wall of pressure chamber；
3rd horizontal stress loading depression bar, the 3rd horizontal stress loading depression bar are installed in the 3rd horizontal stress loading hole
It is slidably matched with the sealing of the 3rd horizontal stress loading hole, the piston rod and the 3rd level of the 3rd horizontal stress load cylinder should
The outer end of power loading depression bar is fixedly connected with, and the 3rd horizontal stress load cylinder is fixedly connected with by cylinder body with the outer wall of pressure chamber；
4th horizontal stress loading depression bar, the 4th horizontal stress loading depression bar are installed in the 4th horizontal stress loading hole
It is slidably matched with the sealing of the 4th horizontal stress loading hole, the piston rod and the 4th level of the 4th horizontal stress load cylinder should
The outer end of power loading depression bar is fixedly connected with, and the 4th horizontal stress load cylinder is fixedly connected with by cylinder body with the outer wall of pressure chamber；
Vertical stress loading depression bar is installed in the vertical stress loading hole, vertical stress loading depression bar adds with vertical stress
Carry hole sealing to be slidably matched, piston rod and the outer end of vertical stress loading depression bar of the vertical stress load cylinder are fixedly connected with,
Vertical stress load cylinder is fixedly connected with by cylinder body with the outer wall of pressure chamber；
In the inner of the first level stress loading depression bar, inner, the 3rd horizontal stress of the second horizontal stress loading depression bar
The inner of loading depression bar, the inner of the 4th horizontal stress loading depression bar, vertical stress load the inner and detachable close of depression bar
The lower surface for covering plate is mounted on pressure head；
Between the piston rod of the first level stress loading depression bar and first level stress loading oil cylinder, the second horizontal stress
Load between depression bar and the piston rod of the second horizontal stress load cylinder, the 3rd horizontal stress loads depression bar and the 3rd horizontal stress
Between the piston rod of load cylinder, between the 4th horizontal stress loading depression bar and the piston rod of the 4th horizontal stress load cylinder,
Vertical stress to be loaded and add strain gauge between depression bar and the piston rod of vertical stress load cylinder；
The long-term voltage-stabilizing system of load cylinder includes fuel tank, oil pump, check valve, overflow valve, the first solenoid directional control valve, the second electricity
Magnetic reversal valve, the 3rd solenoid directional control valve, the first vacuum tank, the second vacuum tank, the 3rd vacuum tank, first pressure recuperation valve, second
Pressure-compensated valve, the 3rd pressure-compensated valve, first throttle valve, second throttle and the 3rd choke valve；
The oil pump oil inlet is connected with fuel tank, and oil pump oil-out is connected with check valve oil inlet, check valve oil-out point
Be the output of four tunnels, the first via is connected by overflow valve with fuel tank, the second tunnel pass through the first solenoid directional control valve and meanwhile with the first water
Horizontal stress load cylinder and the second horizontal stress load cylinder are connected, and the 3rd tunnel is by the second solenoid directional control valve simultaneously with the 3rd
Horizontal stress load cylinder and the 4th horizontal stress load cylinder are connected, and the 4th tunnel is answered by the 3rd solenoid directional control valve with vertical
Power load cylinder is connected；
The first pressure recuperation valve oil inlet end turns on first level stress loading oil cylinder and the second horizontal stress load cylinder
On pipeline between rodless cavity and the first solenoid directional control valve, first pressure recuperation valve oil outlet end passes through first throttle valve and fuel tank phase
Connection, first vacuum tank is arranged on first pressure recuperation valve oil inlet end pipeline；
The second pressure recuperation valve oil inlet end turns on the 3rd horizontal stress load cylinder and the 4th horizontal stress load cylinder
On pipeline between rodless cavity and the second solenoid directional control valve, second pressure recuperation valve oil outlet end passes through second throttle and fuel tank phase
Connection, second vacuum tank is arranged on second pressure recuperation valve oil inlet end pipeline；
The 3rd pressure-compensated valve oil inlet end is turned between vertical stress load cylinder rodless cavity and the 3rd solenoid directional control valve
Pipeline on, the 3rd pressure-compensated valve oil outlet end is connected by the 3rd choke valve with fuel tank, and second vacuum tank is arranged on
On 3rd pressure-compensated valve oil inlet end pipeline.
2. it is according to claim 1 it is a kind of based on true triaxial loading under coal and rock Creep Mechanics behavior test device, its
It is characterised by：The first level stress loading oil cylinder, the second horizontal stress load cylinder, the 3rd horizontal stress load cylinder,
Rigidity is mounted between 4th horizontal stress load cylinder and the cylinder body of vertical stress load cylinder and the outer wall of pressure chamber
Connecting cylinder, the first level stress loading depression bar, the second horizontal stress loading depression bar, the 3rd horizontal stress loading depression bar, the
Four horizontal stresses load and grating biography are mounted between depression bar and vertical stress loading depression bar and each self-corresponding cylinder that is rigidly connected
Sensor, is measured by grating sensor to the displacement that each horizontal stress loads depression bar.
3. it is according to claim 2 it is a kind of based on true triaxial loading under coal and rock Creep Mechanics behavior test device, its
It is characterised by：Described to be rigidly connected between cylinder and the outer wall of pressure chamber using two-stage connected mode, be rigidly connected a connection end
With external screw thread, and the threaded connection of the first order is carried out by the outer wall of external screw thread and pressure chamber, in the firm of male ends
Property connecting cylinder on be provided with ring flange, and the bolt connection of the second level is carried out by the outer wall of ring flange and pressure chamber.
4. it is according to claim 1 it is a kind of based on true triaxial loading under coal and rock Creep Mechanics behavior test device, its
It is characterised by：The pressure head is provided with some groups according to different size, for being adapted to various sizes of coal and rock sample.
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| CN201710216110.5A CN106885740B (en) | 2017-04-05 | 2017-04-05 | Coal rock mass creep mechanical behavior test device based on true triaxial loading |
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| CN201710216110.5A CN106885740B (en) | 2017-04-05 | 2017-04-05 | Coal rock mass creep mechanical behavior test device based on true triaxial loading |
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