CN110411823A - Frameless rock triaxial tests instrument and working method - Google Patents
Frameless rock triaxial tests instrument and working method Download PDFInfo
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- CN110411823A CN110411823A CN201910668943.4A CN201910668943A CN110411823A CN 110411823 A CN110411823 A CN 110411823A CN 201910668943 A CN201910668943 A CN 201910668943A CN 110411823 A CN110411823 A CN 110411823A
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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
- G01N3/02—Details
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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
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- 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
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- 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
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Abstract
The invention discloses a kind of frameless rock triaxial tests instrument and working methods, belong to rock mechanics technical field.It includes experiment host, computer, Full-digital servo controller, axis presses system, confining pressure system and pore pressure system, axis presses system, confining pressure system, pore pressure system links together with Full-digital servo controller respectively, Full-digital servo controller connects on computers, testing host includes pressure chamber's cylinder, pressure chamber's outer tube wall, self-balancing system and pedestal, pressure chamber's cylinder is mutually chimeric with pressure chamber's outer tube wall, hydraulic press is provided in pedestal, hydraulic press can drive pressure chamber's outer tube wall rise/fall, self-balancing system include self-balancing room and be located at the indoor self-balancing piston of self-balancing, self-balancing room is located at the top of pressure chamber.For experiment instrument of the present invention during triaxial tests, axis pressure autobalance, has the characteristics that big rigidity, small in size, safety and environmental protection, experiment is simple and fast, experimental result is accurate while confining pressure adds and (unload) load.
Description
Technical field
The invention belongs to rock mechanics technical fields, and in particular to frameless rock triaxial tests instrument and working method.
Background technique
Rock mechanics is the mechanical behavior for carrying out study of rocks with mechanics principle and method and the phenomenon related with mechanics
An emerging science.Not only there is connection closely with foundation of national economy construction, development of resources, environmental protection, disaster reduction and prevention in it
System has important engineering application value, and is also that the basic subject combined is learned on mechanics and ground.For engineering rock
Mechanics, main research contents are the stabilizations of rock and are crushed.Rock Mass Stability mainly includes hole stability, stability of the roadway, side slope
Stable, strata movement and bump etc..Catalase includes Mechanical Crushing, blasting rock-broken, hydraulic drilling and electric physics broken rock
Deng.Rock mechanics principle is widely used to land and marine oil and gas exploitation, mining, people's air defense, tunnel, building, water conservancy water at present
The engineering fields such as electricity so that engineering design or Process Design are more reasonable, and produce huge economic benefit.
The experiment of rock mechanics normal triaxial refers to be studied under simulation certain temperature and pressure condition with cylinder specimen
The experiment of mechanical property under the in situ physical environment of rock is the important way of rock mechanics research.In order to obtain rock
The Complete Stress-Strain Curve of stone needs to improve the rigidity of main machine frame, and normal triaxial experimental provision host experienced in decades
From four pillar constructions to the evolution of frame structure.Rock triaxial strength ginseng can be tested as CN107505207 A discloses one kind
Several Multifunctional drill broken rock experimental provisions and method, it include agent set, pressure head structure, confining pressure system, acoustic emission system,
Temperature control system and hole material injected system；Agent set includes autoclave pedestal and autoclave cover board, autoclave cover board
It is fixedly arranged at the top of autoclave pedestal, experiment chamber is formed between autoclave pedestal and autoclave cover board, is opened up on autoclave cover board
There is the pilot hole of connection experiment chamber, experiment is intracavitary to be provided with confining pressure set, rock sample is provided in confining pressure set, experiment is intracavitary to be provided with temperature
Spend sensor and pressure sensor, temperature sensor and pressure sensor respectively with the thermometer and pressure that are located at outside agent set
The connection of power table.
But prior art experimental provision still has that volume is big, the lifting of at high cost, experimentation mesohigh kettle makes axis pressure
System is not easy the problems such as centering.Meanwhile pressure chamber's piston bottom end will receive very big active force when adding confining pressure, need host to put down
Weighing apparatus, so that host tonnage is significantly increased, can bring certain error to the metering of axial load.
Summary of the invention
The purpose of the present invention is to provide a kind of frameless rock triaxial tests instrument and working methods, are not only omitted and account for
The biggish main machine frame in ground, experimentation do not have to go up and down autoclave body repeatedly, and during triaxial tests, confining pressure adds and (unload) load
Axis presses autobalance simultaneously, has the characteristics that big rigidity, small in size, safety and environmental protection, experiment is simple and fast, experimental result is accurate.
One of task of the invention is to provide a kind of frameless rock triaxial tests instrument, and which employs following technical sides
Case:
A kind of frameless rock triaxial tests instrument comprising experiment host, computer, Full-digital servo controller, axis pressure
System, confining pressure system and pore pressure system, the described axis pressure system, confining pressure system, pore pressure system digital are watched with described respectively
It takes controller to link together, the Full-digital servo controller is connected on the computer；
The experiment host includes pressure chamber's cylinder, pressure chamber's outer tube wall, self-balancing system and pedestal, the pressure
Room cylinder is mutually chimeric with pressure chamber's outer tube wall, and hydraulic press is provided in the pedestal, and the hydraulic press can drive
Pressure chamber's outer tube wall rise/fall is moved, when pressure chamber's outer tube wall decline, pressure chamber's cylinder is in beat
Open state, when pressure chamber's outer tube wall rises, pressure chamber's cylinder is in closed state；
When pressure chamber's cylinder is in off state, pressure chamber's cylinder and pressure chamber's outer tube wall shape
At the pressure chamber for placing sample, when loading to sample, seaming chuck is provided with above the sample, it is described
It is provided with push-down head below sample, axial deformation sensor and radial deformation sensing are installed on the outside of the sample
Device；
The self-balancing system include self-balancing room and be located at the indoor self-balancing piston of self-balancing, the self-balancing
Room is located at the top of the pressure chamber, and it keeps being connected between pressure chamber, the lower end surface of the self-balancing piston and institute
The mode for taking hemisphere to inlay between the upper surface for the seaming chuck stated, between the seaming chuck and pressure chamber's cylinder, described
Push-down head and between the indoor sample table of pressure pass through spring connect；
The computer is used to send instructions to the Full-digital servo controller, the full Digitized Servo Control
Device is respectively used to control axis pressure system, confining pressure system and the pore pressure system.
As a preferred solution of the present invention, above-mentioned axis pressure system includes that axis pressure sensor, axis press pump and piston are multiple
Position chamber, above-mentioned axis pressure sensor press data line to connect with above-mentioned Full-digital servo controller by axis, above-mentioned axis
Press pump is connect with above-mentioned Full-digital servo controller, and above-mentioned axis press pump is controlled by above-mentioned Full-digital servo controller
Loading and unloading.
As another preferred embodiment of the invention, above-mentioned confining pressure system include confining pressure sensor, confining pressure pump, air pump and
Oil removal set, above-mentioned confining pressure sensor is connect by confining pressure data line with above-mentioned Full-digital servo controller, above-mentioned
Confining pressure pump is connect with above-mentioned Full-digital servo controller, and the load of above-mentioned confining pressure pump is controlled by Full-digital servo controller
With unloading.
Further, above-mentioned pore pressure system includes sensor for pore water pressure, hole press pump, and above-mentioned sensor for pore water pressure passes through pore pressure
Data line is connect with above-mentioned Full-digital servo controller, and above-mentioned hole press pump and above-mentioned Full-digital servo controller connect
It connects, passes through the loading and unloading of above-mentioned Full-digital servo controller control hole press pump.
Further, when above-mentioned pressure chamber's cylinder is in closed state, outside pressure chamber's cylinder and above-mentioned pressure chamber
It is slightly tightened and is locked by screw between barrel.
Further, self-balancing piston lower surface area in the area of above-mentioned self-balancing upper piston area annulus and pressure chamber
It is equal, it is connected between above-mentioned pressure chamber and self-balancing room by high pressure line holding, when carrying out confining pressure pressurization, is acted on certainly
The load of dummy piston lower end is equal to the load acted on balance pressure chamber's annulus, i.e., axis suffered by self-balancing piston plus when confining pressure
To being with joint efforts zero.
Further, above-mentioned self-balancing piston and seaming chuck internal reservation have duct used in load pore pressure, certainly flat
The channel diameter that weighing apparatus piston and the seaming chuck place of combining reserve is gradually expanded；Wherein seaming chuck lower end surface is plane, and is carved with recessed
Slot.
Preferably, groove, above-mentioned push-down head and above-mentioned sample table are carved in above-mentioned push-down head middle with hole, upper surface
Between also take hemisphere to inlay the mode of combination.
Preferably, the step of loading and unloading of above-mentioned axis press pump is controlled by above-mentioned Full-digital servo controller
Are as follows: when axis is pressed and loaded, the emptying of piston reset chamber facilitates axis pressure to load by self-balancing piston, living after the completion of axis is pressed and unloaded
Plug reseting cavity in controlled by servo controller it is oil-filled, so that self-balancing piston be resetted.
Compared with prior art, present invention offers following advantageous effects:
(1) in structure design, traditional three axis are replaced in such a way that pressure chamber's outer tube wall is mutually fitted into pressure chamber's cylinder
The frame and autoclave of experimental provision, complete machine rigidity is promoted obviously, and machine volume is greatly reduced, and saves material；Pressure chamber's column
The height of body is much smaller than the frame of traditional triaxial tests machine, greatly reduces the elastic potential energy of peak strength front baffle storage, makes
The load-deformation curve of post-peaking phase is more acurrate；
(2) in normal triaxial experiment, confining pressure oil has part and spills into ground, pollutes environment, waste of resource, this
Equipment design has Oil residue recuperation, reuses more environmentally-friendly.
(3) the frameless rock triaxial tests instrument of the present invention has self-balancing system, accomplishes confining pressure during triaxial tests
Axis pressure autobalance, can preferably guarantee the accuracy of experimental data while adding and (unload) load.
(4) the frameless rock triaxial tests instrument of the present invention has the characteristics that experiment is simple and convenient, saves during the experiment
Complicated pressure chamber goes up and down program, and pressure chamber rises in traditional three-axis mounting, decline needs artificially in, and there is safety
Hidden danger, pressurisation of pressure chambers needs to be fixed with bolt or the locking of bulky stationary slip, and frameless three axis of rock of the present invention is real
It tests instrument to be mutually fitted into using pressure chamber's outer tube wall with pressure chamber's cylinder, with the raising and lowering of press machine driving outer tube wall, uses screw
Slightly locked, can be completed in a short time Preparatory work of experiment work, accomplish it is safe, time saving, laborsaving, save worry.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawing:
Fig. 1 is the frameless rock triaxial tests instrument overall structure diagram in the present invention；
Fig. 2 is the self-balancing piston schematic diagram in the present invention；
(3a) (3b) is respectively the self-balancing piston and seaming chuck structural schematic diagram in the present invention in Fig. 3；
(4a) (4b) is respectively the sample table and push-down head structural schematic diagram in the present invention in Fig. 4；
Fig. 5 is the pressure chamber cross-section schematic top plan view in the present invention；
Wherein, 1, axis pressure data line；2, piston reset chamber；3, self-balancing room；4, self-balancing piston；5, pore pressure is logical
Road；6, seaming chuck；7, screw is slightly；8, radial deformation sensor；9, axial deformation sensor；10, pressure chamber；11, outside pressure chamber
Barrel；12, pressure chamber's cylinder；13, pedestal；14, fluctuating orbit；15, high pressure line；16, sample；17, oil removal set；18, sample
Platform；19, confining pressure data line；20, pore pressure data line；21, oil return pipe；22, oil supply line；23, oil return valve；24, it encloses
Press pump；25, hole press pump；26, air pump；27, breather valve；28, snorkel；29, axis press pump；30, servo control data line；31, complete
Digital servo controller；32, computer；33, push-down head；34, screw；35, spring；36, seaming chuck groove；37, connector；
38, piston reset pipeline；39, push-down head groove.
Specific embodiment
The invention proposes a kind of frameless rock triaxial tests instrument and working methods, in order to make advantages of the present invention, skill
Art scheme is clearer, clear, elaborates below with reference to specific implementation example to the present invention.
The biggish main machine frame of land occupation, experiment is not only omitted in frameless rock triaxial tests instrument proposed by the present invention
Process does not have to go up and down autoclave body repeatedly, and in triaxial tests, and axis pressure autobalance, has rigidity while confining pressure adds and (unload) load
Greatly, small in size, safety and environmental protection, the feature that experiment is simple and fast, experimental result is accurate.
In conjunction with shown in Fig. 1 to Fig. 5, a kind of frameless rock triaxial tests instrument of the present invention mainly includes computer 32, complete
Digital servo controller 31, frameless experiment host, axis pressure system, confining pressure system and pore pressure system.
Computer 32 is connected with Full-digital servo controller 31 by servo control data line 30, Full-digital servo controller
31 are connected with axis pressure system, confining pressure system and pore pressure system by data line respectively, the top of frameless experiment host and
Pressure chamber's cylinder is closely connected by connector 37, and Full-digital servo controller 31 is also connected with piston reset pipeline 38；
As a main improvement of the invention, frameless experiment host is by pressure chamber's outer tube wall 11, pressure chamber's column
Body 12, the self-balancing room 3 on top and lower base 13 are constituted, and wherein self-balancing room 3 and pressure chamber 10 pass through high pressure line 15
Connection；
Axis presses system to be made of axis pressure sensor, axis pressure data line 1, axis press pump 29, piston reset chamber 2 etc..Axis pressure
Sensor presses data line 1 to be connected with Full-digital servo controller 31 by axis, axis press pump 29 and Full-digital servo controller
31 are connected, and Full-digital servo controller 31 are sent instructions to by experiment software on computer 32, by Full-digital servo controller
The loading and unloading of 31 control shaft press pumps 29 is controlled in piston reset chamber 2 by Full-digital servo controller 31 when axis is pressed and loaded
It is not oil-filled, facilitate axis pressure to load by self-balancing piston 4, when axis is pressed and unloaded, by full Digitized Servo Control in piston reset chamber 2
Device 31 control it is oil-filled, so that self-balancing piston 4 be resetted；
Above-mentioned confining pressure system is by confining pressure pump 24, confining pressure data line 19, air pump 26, oil return apparatus, oil removal set 17 etc.
Composition, confining pressure sensor are connected by confining pressure data line 19 with Full-digital servo controller 31, confining pressure pump 24 with it is digital
Servo controller 31 is connected, and the loading and unloading of confining pressure pump 24 is controlled by Full-digital servo controller 31；
Above-mentioned pore pressure system is made of hole press pump 25, sensor for pore water pressure, pore pressure data line 20 etc., sensor for pore water pressure
It is connected by pore pressure data line 20 with Full-digital servo controller 31, hole press pump 25 is connected with Full-digital servo controller 31,
By the loading and unloading of 31 control hole press pump 25 of Full-digital servo controller.
Further, pressure chamber's outer tube wall 11 of above-mentioned frameless host is mutually fitted into pressure chamber's cylinder 12, passes through lower part
11 raising and lowering of barrel outside hydraulic press driving pressure room in pedestal 13, such as by means of fluctuating orbit 14, pressure chamber's outer tube wall 11
Pressure chamber 10 is opened when declining along fluctuating orbit 14, pressure chamber's outer tube wall 11, which rises, closes pressure chamber 10, pressure chamber when closing
Outer tube wall 11 tighten with screw slightly 7 locked；In order to survey after accomplishing load-deformation curve peak, 12 rigidity of pressure chamber's cylinder
It is sufficiently large, play the role of frame in traditional triaxial tests device；And the height of pressure chamber's cylinder 12 is much smaller than traditional three axis reality
The frame for testing machine greatly reduces the elastic potential energy of peak strength front baffle storage, makes the load-deformation curve of post-peaking phase more
Accurately；Frame kettle integration, improves overall stiffness, greatly reduces device volume, the anti-of experimentation mesohigh kettle is omitted
Multiple lifting.
Above-mentioned self-balancing system, including self-balancing room 3 and be located at the indoor self-balancing piston 4 of self-balancing, self-balancing room 3
Positioned at the top of pressure chamber, and it is to be formed by connecting between pressure chamber by high pressure line 15.
The principle of above-mentioned self-balancing system is: in self-balancing room 3 the area A annulus of 4 top annulus of self-balancing piston and
The end face self-balancing piston lower surface area A is equal in pressure chamber, and two cavitys are connected by high pressure line 15, in confining pressure pressurization
The load for acting on self-balancing piston is equal to the load acted on balance pressure chamber's annulus, i.e., plus when confining pressure self-balancing is living
Suffered plug is axially zero with joint efforts.
The mode that hemisphere is inlayed is taken in the lower end surface of above-mentioned self-balancing piston 4 and the upper surface of seaming chuck 6, and self-balancing is living
Plug 4 and 6 internal reservation of seaming chuck have hole pressure passageway 5 used in load pore pressure, in order in seaming chuck 6 and 16 alignment procedure of sample
The load for not influencing pore pressure is gradually expanded in self-balancing piston 4 and 6 place's of combining reserving hole channel diameter of seaming chuck；Wherein upper pressure
Seaming chuck groove 36 is carved with for plane for pore pressure uniform load in first 6 lower end surface, leads between seaming chuck 6 and pressure chamber's cylinder 12
It crosses spring 35 to be connected, be fixed by screw 34；Push-down head groove 39 is carved in 33 middle with hole of push-down head, upper surface, under
Pressure head 33 is connect by spring with sample table 18, and the two also takes hemisphere to inlay the mode of combination, when 16 end face of sample is not flat,
Accomplish uniform pressurization.
Above-mentioned confining pressure oil return apparatus is by oil return valve 23, oil return pipe 21,22 structure of breather valve 27, snorkel 28 and oil supply line
At, when needing oil return, opening oil return valve 23 and breather valve 27, so that it may carry out oil return.
Above-mentioned frameless host uses chrome molybdenum material, carries out integral type and is fitted into, at service load 500KN,
Shape becomes 0.035mm, and can be calculated rigidity is 14GN/m, and conventional frame formula triaxial tests machine is at service load 500KN, shape
Become 0.05mm, by rigidity formula calculate rigidity is 10GN/m, present invention rigidity compared with traditional experiment machine improves 40%,
Further improve the scope of application of experimental machine.
The frameless rock triaxial tests instrument working method of the present invention the following steps are included:
The first step installs radial deformation sensor 8 and axial deformation biography with 17 sealing sample of oil removal set and on the outside of sample
Sensor 9；
Second step, cracking pressure room 10 are simultaneously placed on sample 16 to push-down head 33, and the transmission of deformation-sensor data is connected
Line；
Third step, clossing pressure room 10 tighten the screw slightly 7, confining pressure filling liquid are then carried out, after confining pressure is loaded into setting value
Stop pressurizeing and start to carry out axial stress load；
4th step carries out Rock Mechanics Test, and computer 32 obtains resultant stress-strain empirical curve；
Axial stress is first unloaded after 5th step, experiment, then is unloaded confining pressure and opened breather valve 27 and oil return valve 23 and return
Receive hydraulic oil；
6th step removes the opening of screw slightly 7 taking-up of pressure chamber 10 sample 16.
The biggish frame of land occupation, experiment is not only omitted compared with other rock mechanics triaxial tests devices in the present invention
Process does not have to go up and down autoclave body repeatedly, and the height of pressure chamber's inner cylinder is much smaller than the frame of traditional triaxial tests machine, greatly reduces
The elastic potential energy of peak strength front baffle storage, keeps the load-deformation curve of post-peaking phase more acurrate；And in triaxial tests
In, axis pressure autobalance while confining pressure adds and (unload) load, and then the accuracy of experimental data is further ensured, it increases to work
The directive function of journey design.The present invention integrally has rigidity big, small in size, safety and environmental protection, tests simple and fast, experimental result standard
True feature.
It uses for reference the prior art and can be realized in the part that do not addressed in the present invention.
It should be noted that any equivalent way that those skilled in the art are made under the introduction of this specification, or
Obvious variant should all be within the scope of the present invention.
Claims (10)
1. a kind of frameless rock triaxial tests instrument comprising experiment host, computer, Full-digital servo controller, axis pressure system
System, confining pressure system and pore pressure system, the axis pressure system, confining pressure system, pore pressure system respectively with the full-digital servo
Controller links together, and the Full-digital servo controller is connected on the computer, it is characterised in that:
The experiment host includes pressure chamber's cylinder, pressure chamber's outer tube wall, self-balancing system and pedestal, pressure chamber's column
Body is mutually chimeric with pressure chamber's outer tube wall, and hydraulic press is provided in the pedestal, and the hydraulic press can drive institute
The pressure chamber's outer tube wall rise/fall stated, when pressure chamber's outer tube wall decline, pressure chamber's cylinder is in open shape
State, when pressure chamber's outer tube wall rises, pressure chamber's cylinder is in closed state；
When pressure chamber's cylinder is in off state, pressure chamber's cylinder and pressure chamber's outer tube wall are formed and are used
Seaming chuck, the sample are provided with above the sample when loading to sample in the pressure chamber for placing sample
Lower section be provided with push-down head, axial deformation sensor and radial deformation sensor are installed on the outside of the sample；
The self-balancing system includes self-balancing room and is located at the indoor self-balancing piston of self-balancing, the described self-balancing room position
In the top of the pressure chamber, and it keeps being connected between pressure chamber, the lower end surface of the self-balancing piston and described
The mode for taking hemisphere to inlay between the upper surface of seaming chuck, the pushing between the seaming chuck and pressure chamber's cylinder, described
Head and positioned at the indoor sample table of pressure between pass through spring connection；
The computer is used to send instructions to the Full-digital servo controller, the Full-digital servo controller point
Axis pressure system, confining pressure system and the pore pressure system Yong Yu not controlled.
2. a kind of frameless rock triaxial tests instrument according to claim 1, it is characterised in that: the axis presses system packet
Include axis pressure sensor, axis press pump and piston reset chamber, the axis pressure sensor by axis press data line with it is described complete
Digital servo controller connection, the axis press pump connect with the Full-digital servo controller, by described digital
Servo controller controls the loading and unloading of the axis press pump.
3. a kind of frameless rock triaxial tests instrument according to claim 1, it is characterised in that: the confining pressure system packet
Include confining pressure sensor, confining pressure pump, air pump and oil removal set, the confining pressure sensor by confining pressure data line with it is described complete
Digital servo controller connection, the confining pressure pump are connect with the Full-digital servo controller, pass through full-digital servo control
Device processed controls the loading and unloading of confining pressure pump.
4. a kind of frameless rock triaxial tests instrument according to claim 1, it is characterised in that: the pore pressure system packet
Sensor for pore water pressure, hole press pump are included, the sensor for pore water pressure passes through pore pressure data line and the full Digitized Servo Control
Device connection, the hole press pump are connect with the Full-digital servo controller, pass through the Full-digital servo controller control
The loading and unloading of drilling press pump.
5. a kind of frameless rock triaxial tests instrument according to claim 1, it is characterised in that: when pressure chamber's column
When body is in closed state, is slightly tightened and locked by screw between pressure chamber's cylinder and pressure chamber's outer tube wall.
6. a kind of frameless rock triaxial tests instrument according to claim 1, it is characterised in that: the self-balancing piston
Self-balancing piston lower surface area equation in the area of top annulus and pressure chamber leads between the pressure chamber and self-balancing room
It crosses high pressure line and keeps connection, when carrying out confining pressure pressurization, the load for acting on self-balancing piston, which is equal to, acts on balance
Load on pressure chamber's annulus, i.e., plus it is axial suffered by self-balancing piston when confining pressure be with joint efforts zero.
7. a kind of frameless rock triaxial tests instrument according to claim 1, it is characterised in that: the self-balancing piston
There is duct used in load pore pressure with seaming chuck internal reservation, it is straight in the reserved duct of self-balancing piston and the seaming chuck place of combining
Diameter is gradually expanded；Wherein seaming chuck lower end surface is plane, and is carved with groove.
8. a kind of frameless rock triaxial tests instrument according to claim 1, it is characterised in that: among the push-down head
With holes, groove is carved in upper surface, and hemisphere is also taken to inlay the mode of combination between the push-down head and the sample table.
9. a kind of frameless rock triaxial tests instrument according to claim 2, which is characterized in that by described digital
The step of loading and unloading of the servo controller to control the axis press pump are as follows: when axis is pressed and is loaded, the emptying of piston reset chamber, side
Just axis pressure is loaded by self-balancing piston, after the completion of axis pressure unloading, piston reset is intracavitary controlled by servo controller it is oil-filled, from
And self-balancing piston is resetted.
10. a kind of -9 described in any item working methods of frameless rock triaxial tests instrument, feature exist according to claim 1
In, successively the following steps are included:
A, sealing sample is covered with oil removal and radial deformation sensor and axial deformation sensor are installed on the outside of sample；
B, it cracking pressure room and places on sample to push-down head, connects deformation-sensor data line；
C, clossing pressure room tightens the screw slightly, then carries out confining pressure filling liquid, stops pressurizeing and opening after confining pressure is loaded into setting value
Begin to carry out axial stress load；
D, Rock Mechanics Test is carried out, computer obtains resultant stress-strain empirical curve；
E, axial stress is first unloaded after experiment, then is unloaded confining pressure and opened charge valve and oil return valve recycling hydraulic oil；
F, it removes screw slightly, opens pressure chamber and take out sample.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910668943.4A CN110411823A (en) | 2019-07-24 | 2019-07-24 | Frameless rock triaxial tests instrument and working method |
| PCT/CN2019/106609 WO2021012371A1 (en) | 2019-07-24 | 2019-09-19 | Frameless triaxial rock test apparatus and operating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910668943.4A CN110411823A (en) | 2019-07-24 | 2019-07-24 | Frameless rock triaxial tests instrument and working method |
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| CN110411823A true CN110411823A (en) | 2019-11-05 |
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| CN201910668943.4A Pending CN110411823A (en) | 2019-07-24 | 2019-07-24 | Frameless rock triaxial tests instrument and working method |
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| WO (1) | WO2021012371A1 (en) |
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| CN111307606A (en) * | 2020-04-07 | 2020-06-19 | 四川大学 | Deep high-temperature and high-pressure environment rock stretching and tension-compression circulating mechanical experiment device |
| CN112881188A (en) * | 2021-01-18 | 2021-06-01 | 中国矿业大学(北京) | Laboratory three-dimensional dynamic rock breaking test system and method |
| CN113514331A (en) * | 2021-06-08 | 2021-10-19 | 浙江大学 | Large-load double-shaft compression loading device |
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