CN108760511A - Three axis loading device of dynamic disturbances servo based on conventional rock test rig and system - Google Patents
Three axis loading device of dynamic disturbances servo based on conventional rock test rig and system Download PDFInfo
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- CN108760511A CN108760511A CN201810038434.9A CN201810038434A CN108760511A CN 108760511 A CN108760511 A CN 108760511A CN 201810038434 A CN201810038434 A CN 201810038434A CN 108760511 A CN108760511 A CN 108760511A
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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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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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
- G01N2203/02—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
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Abstract
The present invention relates to a kind of three axis loading device of dynamic disturbances servo based on conventional rock test rig, including pedestal, load master cylinder, loading frame, push-down head, seaming chuck and confining pressure cylinder mechanism, it further include large disturbances bar, the built-in load sensor of lower end connection of large disturbances bar, the upper end of large disturbances bar is connected with support plate, the upper end of support plate connects outer sensor, loading frame has support beam, it further include disturbance oil cylinder, further include that interior disturbance force snesor is set in outer sensor, the lower end of disturbance force snesor is correspondingly provided with the microvariations bar that can be acted on large disturbances bar.The present invention can also apply axial perturbed force by disturbing oil cylinder, microvariations bar and large disturbances bar, meet the synergistic effect requirement of different high-ground stress and energetic disturbance factor other than it can carry out the Road test of conventional Mechanical loading experiment.
Description
Technical field
The present invention relates to a kind of three axis loading device of dynamic disturbances servo and system based on conventional rock test rig belongs to
Rock mechanics experiment technical field.
Background technology
Earth surface is covered by the rock of about 60-120 kilometers of a thickness, and rock is as the most commonly used day of earth's crust distribution
Right material, it is closely bound up with the engineering fields such as building, mining, water conservancy.Some authoritative scholars of the world today propose：21 century is
The century of underground space development.With the continuous expansion of city size, the scarce resources growing tension such as soil, water, Xiang Di
Under want space to have become to push urban sustainable development, build there is height to prevent and reduce natural disasters horizontal, structure resource-conserving, ring
The important measure of border friendly society and city is rapidly carried out in transport development, the gradual short time equivalence background of superficial part resource
Under, the utilization of Deep Underground Space, the exploitation of deep mineral resources gradually develop to normalization direction.
However, the excavation mechanical environment of deep rock mass is loaded with significantly different from superficial part rock routine mechanics, " three is high
The it is proposed of one disturbance " has been well demonstrated that this point, i.e. high-ground stress, High-geotemperature, hyperosmosis and strong exploitation disturbance.
Residing for deep rock mass and non-monotonic loading environment, but experienced the unloading damage under free face formation high stress, ground temperature liter
The exterior power effect that height, groundwater pressure and outburst amount increase and cycle is multiple (blows out or mechanical rock drilling shakes, overlying strata
It is broken inbreak, rock burst, microseism etc.) it synchronizes, the perturbation process of mixing, Mechanical loading environment is increasingly complex.Up to the present, by
Lack deep rock engineering experience in people, it is opposite to the research and understanding of above-mentioned perturbation process medium and deep mechanical response of the rock mass
It is insufficient so that effective prediction and control, engineering are difficult to paroxysmal accident and disaster in deep rock engineering
Design of its support cannot be satisfied the safety condition of deep rock mass engineering project, phenomena such as to generate rock burst, seriously threaten engineering staff
Personal safety and construction quality.Ordinary triaxial test machine almost without may be implemented dynamic disturbances load function.
In consideration of it, the present inventor carries out in-depth study to the above problem, there is this case generation then.
Invention content
The purpose of the present invention is to provide a kind of, and three axis of the dynamic disturbances servo load based on conventional rock test rig fills
It sets, meets the synergistic effect requirement of different high-ground stress and energetic disturbance factor, to the hair for promoting rock mechanics indepth to test
Exhibition makes up previous rock triaxial test machine and cannot be satisfied rock mechanics indepth experiment in the afunction for disturbing part.
Another object of the present invention is to provide independence, the synchronous controls of a kind of achievable energetic disturbance and confining pressure, can be real
Mechanical response under existing high stress environment by exterior power disturbance is studied, and axially different stress, different confining pressures and difference are met
The three axis loading system of dynamic disturbances servo based on conventional rock test rig that the synergistic effects such as forcing frequency, amplitude require.
In order to achieve the above object, the present invention uses such technical solution：
Three axis loading device of dynamic disturbances servo based on conventional rock test rig, including pedestal, be set on the base
Load master cylinder, the loading frame being connect with the cylinder body of pedestal or load master cylinder, push-down head, coordinate with push-down head it is upper
Pressure head and confining pressure cylinder mechanism form the grasping part for placing rock sample, load master cylinder between seaming chuck and push-down head
Piston rod corresponds to push-down head setting, further includes the large disturbances bar being threaded through in confining pressure cylinder mechanism, in the lower end connection of large disturbances bar
Load sensor is set, the upper end of large disturbances bar is connected with support plate, and the upper end of support plate connects outer sensor, loading frame
With support beam, outer sensor is connected to the lower end of support beam, further includes disturbance oil cylinder, and the cylinder body for disturbing oil cylinder is solid
It is scheduled in support beam, the piston rod for disturbing oil cylinder is vertically arranged and stretches into loading frame, further includes being arranged outside
Disturbance force snesor in setting in sensor, the lower end for disturbing force snesor are correspondingly provided with and can act on large disturbances bar
The lower end of microvariations bar, the piston rod that the upper end for disturbing force snesor corresponds to disturbance oil cylinder is arranged, and is equipped on the supporting plate logical
Hole, microvariations bar are arranged in through-holes.
As a kind of preferred embodiment of the present invention, the sensor that the built-in load sensor is 2000KN is described external
Sensor is the sensor of 3000KN, the sensor that the disturbance force snesor is 500KN.
As the present invention a kind of preferred embodiment, the loading frame include bottom girder, the first longeron, the second longeron and
The support beam, the first longeron and the second longeron is parallel erects on bottom girder, the support beam setting in the first longeron and
On second longeron.
Further include sample presentation trolley as a kind of preferred embodiment of the present invention, the bottom girder is equipped with for sample presentation carriage walking
The first guide rail and the second guide rail, the first guide rail and the second guide rail are arranged in parallel.
As a kind of preferred embodiment of the present invention, the upper end of the piston rod of the load master cylinder is equipped with fastening screw,
The sample presentation trolley is equipped with the locating slot coordinated with fastening screw.
As a kind of preferred embodiment of the present invention, the push-down head is fixed on the sample presentation trolley, and the seaming chuck is logical
Bindiny mechanism is crossed to be releasably locked together with the push-down head.
As a kind of preferred embodiment of the present invention, confining pressure cylinder mechanism includes that can be moved axially along the large disturbances bar
Confining pressure cylinder and the pressing mechanism that is connect with confining pressure cylinder, the sample presentation trolley be equipped with the support base being arranged with confining pressure cylinder, confining pressure
The lower end of cylinder is locked together with support base by bolt, and locating rod is equipped on support base, is corresponded to and is set in the lower end of confining pressure cylinder
There is the guide groove coordinated with locating rod.
As a kind of preferred embodiment of the present invention, the support plate is steel plate, and the microvariations bar is connected to the disturbance
The lower end of force snesor.
The present invention also proposes a kind of three axis loading system of dynamic disturbances servo based on conventional rock test rig, including power
Learn loading system, data collecting system and carry out data processing strain measurement system, Mechanical loading system include pedestal,
The load master cylinder that is set on the base, with pedestal or load loading frame, push-down head that the cylinder body of master cylinder connect and
The seaming chuck and confining pressure cylinder mechanism of push-down head cooperation, the clamping formed between seaming chuck and push-down head for placing rock sample are empty
Between, the piston rod for loading master cylinder corresponds to push-down head setting, further includes the large disturbances bar being threaded through in confining pressure cylinder mechanism, disturbs greatly
The upper end of the built-in load sensor of lower end connection of lever, large disturbances bar is connected with support plate, and the upper end connection of support plate is outer
Sensor is set, there is loading frame support beam, outer sensor to be connected to the lower end of support beam, further include disturbance oil cylinder,
The cylinder body of disturbance oil cylinder is fixed in support beam, and the piston rod for disturbing oil cylinder is vertically arranged and stretches into loading frame
In, further include that interior disturbance force snesor is set in outer sensor, the lower end for disturbing force snesor is correspondingly provided with and can make
The lower end for the piston rod for corresponding to disturbance oil cylinder with the microvariations bar on large disturbances bar, the upper end for disturbing force snesor is arranged,
It is equipped with through-hole on the supporting plate, microvariations bar is arranged in through-holes, built-in load sensor, outer sensor, perturbed force sensing
Device and confining pressure cylinder mechanism are connected to data collecting system, and data collecting system is connect with dependent variable system.
Device using the present invention can also lead to other than it can carry out the Road test of conventional Mechanical loading experiment
It crosses disturbance oil cylinder, microvariations bar and large disturbances bar and applies axial perturbed force, meet different high-ground stress and energetic disturbance factor
Synergistic effect requirement, to promote rock mechanics indepth test development, make up previous rock triaxial test machine and cannot be satisfied
Afunction of the rock mechanics indepth experiment in disturbance part.
Description of the drawings
Fig. 1 is that the present invention is based on the vertical views of the three axis loading device of dynamic disturbances servo of conventional rock test rig；
Fig. 2 be in Fig. 1 A-A to sectional view；
Fig. 3 is the side view of the present invention；
Fig. 4 is the enlarged drawing at A in Fig. 2；
Fig. 5 is the load perturbations cosine curve of frequency 0.1Hz amplitudes 0.5kN in the present invention；
Fig. 6 is the shift perturbation cosine curve of frequency 1Hz amplitudes 3.5mm in the present invention；
Fig. 7 is the load perturbations cosine curve of frequency 70Hz amplitudes 0.5kN in the present invention；
Fig. 8 is that granite disturbs the figure to destruction in the present invention；
Fig. 9 is that griotte disturbs the figure to destruction in the present invention；
In figure：
The main load cylinders of 10- pedestals 20-
The piston rod 22- fastening screws of the main load cylinders of 21-
30- loading frames the first longerons of 31-
32- the second longeron 33- bottom girders
34- support beams the first guide rails of 35-
36- the second guide rail 40- sample presentation trolleies
41- support base 42- locating slots
50- rock sample 51- push-down heads
52- seaming chuck 60- confining pressure cylinders
Load sensor 72- large disturbances bars built in 71-
73- outer sensor 74- microvariations bars
75- disturbs force snesor 76- steel plates
80- disturbs the piston rod of oil cylinder 81- disturbance oil cylinders
Specific implementation mode
In order to further explain the technical solution of the present invention, being described in detail below in conjunction with the accompanying drawings.
Referring to figs. 1 to Fig. 9, the three axis loading device of dynamic disturbances servo based on conventional rock test rig, including pedestal
The loading frame that 10, load master cylinder 20 on pedestal 10 is set, connect with the cylinder body of pedestal 10 or load master cylinder 20
30, the seaming chuck 52 and confining pressure cylinder mechanism that push-down head 51, corresponding push-down head 51 are arranged, wherein confining pressure cylinder mechanism can be existing
Confining pressure cylinder mechanism in rock test rig, in embodiment, loading frame 30 is connected on the cylinder body of main load cylinder 20.
The grasping part for placing rock sample 50 is formed in the present invention between seaming chuck 52 and push-down head 51, loads main oil
The piston rod 21 of cylinder is vertically arranged, and the piston rod 21 for loading master cylinder corresponds to the setting of push-down head 51, further includes being threaded through
Large disturbances bar 72 in confining pressure cylinder mechanism, large disturbances bar 72 are vertically arranged, and the lower end connection of large disturbances bar 72 is built-in negative
The upper end of lotus sensor 71, large disturbances bar 72 is connected with support plate, and support plate is horizontally disposed, and the upper end of support plate connects
Outer sensor 73 is connect, there is loading frame 30 support beam 34, outer sensor 73 to be connected to the lower end of support beam 34.
The invention also includes disturbance oil cylinder 80, the cylinder body of disturbance oil cylinder 80 is fixed in support beam 34, disturbs oil cylinder
Piston rod 81 is vertically arranged and stretches into loading frame 30, further includes that interior disturbance is arranged in outer sensor 73
Force snesor 75, disturbance force snesor 75 are connected in a manner of it can move up and down in outer sensor 73, perturbed force sensing
The lower end of device 75 is correspondingly provided with the microvariations bar 74 that can be acted on large disturbances bar 72, disturbs the upper end pair of force snesor 75
The lower end setting that the piston rod 81 of oil cylinder should be disturbed, can specifically be fixed on the lower end of the piston rod 81 of disturbance oil cylinder.It is propping up
Fagging is equipped with through-hole, and microvariations bar 74 is arranged in through-holes.
As a kind of preferred embodiment of the present invention, the sensor that the built-in load sensor 71 is 2000KN is described outer
The sensor that sensor 73 is 3000KN, the sensor that the disturbance force snesor 75 is 500KN are set, disturbance oil cylinder 80 is
The oil cylinder of 300KN.
As a kind of preferred embodiment of the present invention, the loading frame 30 is vertical including bottom girder 33, the first longeron 31, second
Beam 32 and the support beam 34, the first longeron 31 is parallel with the second longeron 32 to be erected on bottom girder 33, the support beam
34 are arranged on the first longeron 31 and the second longeron 32, and the first longeron 31, the second longeron 32 and support beam 34 surround gantry
Formula structure.
Further include sample presentation trolley 40 as a kind of preferred embodiment of the present invention, the bottom girder 33 is equipped with for sample presentation trolley
The first guide rails 35 and the second guide rail 36 of 40 walkings, the first guide rail 35 and the second guide rail 36 be arranged in parallel, and sample presentation trolley 40 is the
It walks on one guide rail 35 and the second guide rail 36.
As a kind of preferred embodiment of the present invention, the upper end of the piston rod 20 of the load master cylinder is equipped with fastening screw
22, it is equipped with the locating slot 42 coordinated with fastening screw 22 in the bottom of the sample presentation trolley 40, passes through fastening screw 22 and positioning
The cooperation of slot 42 so that main load cylinder 20 can accurately jack up sample presentation trolley 40.
As a kind of preferred embodiment of the present invention, the push-down head 51 is fixed on the sample presentation trolley 40, the upper pressure
First 52 are releasably locked together by bindiny mechanism and the push-down head 51.When in use, rock sample 50 is placed on pushing
On first 51, seaming chuck 52 is connected on push-down head 50 by bindiny mechanism later, by push-down head 51, rock sample 50 and upper pressure
First 52 three's is fixed together.Heat-shrinkable T bush for example may be used in bindiny mechanism, and seaming chuck will be realized by heat-shrinkable T bush
52, rock sample 50 and push-down head 51 connect together, and realize the connection of three by pyrocondensation later.It is highly preferred that push-down head
51 are locked in by screw on sample presentation trolley 40, when experiment, push-down head 51 are removed from sample presentation trolley 40, then puts rock
Sample 50 puts pressure head 52 again on rock sample 50, then uses shrinkable sleeve on these three, then heats, push-down head
51, rock sample 50, seaming chuck 52 are bound round together.Push-down head 51, rock sample 50,52 entirety of seaming chuck are put on sample presentation trolley 40 again,
It is fixed with screw, then does load test again.
As a kind of preferred embodiment of the present invention, confining pressure cylinder mechanism includes can be along the axial shifting of the large disturbances bar 72
Dynamic confining pressure cylinder 60 and the pressing mechanism being connect with confining pressure cylinder 60 are controlled the slowly lifting of confining pressure cylinder 60 by jacking system, are protected
Card confining pressure cylinder 60, which is stablized, drops to sample presentation trolley 40, is then fixed with screw or bolt, then again to filling liquid in confining pressure cylinder 60
Then pressure oil adds confining pressure to rock sample again.The sample presentation trolley 40 is equipped with the support base 41 being arranged with confining pressure cylinder 60, confining pressure cylinder
60 lower end is locked together with support base 41 by bolt, locating rod 42 is equipped on support base 41, in confining pressure cylinder 60
Lower end is correspondingly provided with the guide groove coordinated with locating rod 42.When needing pressurization, confining pressure cylinder 60 is fallen, and makes locating rod 42
It is inserted into guide groove and realizes that confining pressure cylinder 60 is locked in support base by confining pressure cylinder 60 and the positioning of support base 41 by screw later
So that forming airtight chamber in confining pressure cylinder 60 on 41.The slowly lifting of confining pressure cylinder 60 is controlled in the present invention by jacking system, is protected
Card confining pressure cylinder 60, which is stablized, drops to sample presentation trolley 40, is then fixed with screw or bolt, is then filled in the middle to confining pressure cylinder 60 again
Then hydraulic oil gives rock sample 50 plus confining pressure, these structures to be had been introduced in existing confining pressure cylinder mechanism again, here no longer in detail
It states.
As a kind of preferred embodiment of the present invention, the support plate 76 is steel plate, and the microvariations bar 74 is connected to described
The lower end of force snesor 75 is disturbed, in embodiment, microvariations bar 74 is arranged in the upper end of large disturbances bar 72, is in inverted " t "
Type applies perturbed force to microvariations bar 74 by disturbing force snesor 75, and is transferred to perturbed force greatly by microvariations bar 74
In disturbing rod 72.
The present invention also proposes a kind of three axis loading system of dynamic disturbances servo based on conventional rock test rig, including power
Loading system, data collecting system and the strain measurement system for carrying out data processing are learned, Mechanical loading system includes pedestal
The loading frame that 10, load master cylinder 20 on pedestal 10 is set, connect with the cylinder body of pedestal 10 or load master cylinder 20
30, push-down head 51, seaming chuck 52 and confining pressure cylinder mechanism with the cooperation of push-down head 51, shape between seaming chuck 52 and push-down head 51
At the grasping part for placing rock sample 50, the piston rod 21 for loading master cylinder corresponds to the setting of push-down head 51, further includes wearing
Large disturbances bar 72 in confining pressure cylinder mechanism, the built-in load sensor 71 of lower end connection of large disturbances bar 72, large disturbances bar 72
Upper end is connected with support plate, and the upper end of support plate connects outer sensor 73, and loading frame 30 has support beam, external biography
Sensor 73 is connected to the lower end of support beam 34, further includes disturbance oil cylinder 80, and the cylinder body of disturbance oil cylinder 80 is fixed on support beam
On 34, the piston rod 81 for disturbing oil cylinder is vertically arranged and stretches into loading frame 30, further includes being arranged in external biography
Disturbance force snesor 75 in sensor 73, the lower end of disturbance force snesor 75, which is correspondingly provided with, can act on large disturbances bar 72
On microvariations bar 74, disturbance force snesor 75 upper end correspond to disturbance oil cylinder piston rod 81 lower end setting, in support plate
It is equipped with through-hole, microvariations bar 74 is arranged in through-holes, built-in load sensor 71, outer sensor 73, disturbance force snesor
75 and confining pressure cylinder mechanism be connected to data collecting system, data collecting system is connect with dependent variable system.
The loading system of the present invention includes master trip machine, EDC switch boards, MOOG valves, servo loading case, Hydraulic servo system, gas
Pump, computer control system etc..Electro-hydraulic servo control is used in the application and control of xial feed, is provided by Hydraulic servo system dynamic
Power loads, and passes through the electro-hydraulic servo proportion group of the high-performance of wide speed regulating range (MOOG valves) and computer digit during experiment
The technologies such as control form full digital closed-loop drive control system, keep main load cylinder 20 that sample presentation trolley 40 and sample presentation is small
The rock sample 50 fixed on vehicle 40 is lifted up by certain velocity of displacement, passes through the fastening screw of 40 bottom of sample presentation trolley
22 are aligned with locating slot 42, and when 52 upper surface of seaming chuck and built-in load sensor 71 contact, the numerical value of load relies on
2000KN load sensors feed back to computer, this is the Road test of conventional mechanics load test, and does three axis of dynamic disturbances
Need to switch to the external load sensors of 3000KN and 500KN disturbance force snesors (at this time of loading frame lower end when experiment
Set the closing of load sensor 71), the two is applied in combination.The confining pressure load of confining pressure cylinder mechanism first passes through confining pressure gas drive and pumps to confining pressure
Hydraulic oil in cylinder pressurizes, to be added to be loaded onto the rear closing confining pressure gas drive pump of desired value or so, then will be enclosed by computer operation
Pressure is transferred to desired value.Entire loading procedure carries out data acquisition according to sampling routine and handles, and is controlled using microcomputer, automatic to remember
Test data is recorded, confining pressure loading procedure is consistent with rock routine Mechanical loading.
Apply axial perturbed force when dynamic disturbances load, perturbation process is still in ordinary triaxial test in confining pressure cylinder
It carries out, high-ground stress may be implemented and be carried out at the same time with perturbed force, this is also based on three axis of the energetic disturbance load of rock test rig
One of advantage of system.Perturbed force is applied by 30 top 300 KN disturbance oil cylinders of loading frame, is acted on by large disturbances bar 72
50 upper surface of rock sample, the highest frequency for disturbing load can reach 70Hz.There are many forms for the waveform of disturbance load：Cosine wave, three
The amplitude of angle wave, square wave etc., applied perturbed force is divided into two kinds of displacement and load.When carrying out dynamic disturbances triaxial test,
It needs the 2000KN load sensors of conventional Mechanical loading being converted to the external loads of 3000KN by changing load control manner
Sensor and 500KN disturb force snesor, and external 73 lower parts of load sensor wherein 3000KN connect the larger steel of one piece of rigidity
Plate 76, steel plate 76 connect large disturbances bar 72 in annular shape, 76 lower part of steel plate, and xial feed is passed through steel plate 76 by large disturbances bar 72
It is transmitted on the external load sensors of 3000 KN 73, for acquiring the numerical value of xial feed.500KN disturbance force snesors 75 are set
It sets in the inside of outer sensor 73, perturbed force is loaded directly into 500KN disturbance force snesors 75 by disturbance oil cylinder 80, mesh
Be directly acquire perturbed force numerical value.500KN disturbs lower end on the outside of force snesor and connects a microvariations bar 74, and passes through
76 centre bore of steel plate acts directly on large disturbances bar 72, and perturbed force is applied to 50 upper end of rock sample by large disturbances bar 72 again.Two
Set system independently applies, and needs the two being added in the Data processing in later stage.
Strain measurement system by axial extended device (axial LVDT), chain type circumferential direction extended device (circumferential LVDT), data line with
And computer composition.Axial extensometer range be 0-10mm, chain type circumferential direction extensometer range be 0-3mm, measurement accuracy be ±
0.5%, for rate of deformation control range in 0.001-2mm/min, the displacement of strain gauge passes through data line transfer to electrometer
Calculation machine, is shown in test software after processing.
Data collecting system mainly during the test by the collected xial feed of load sensor, confining pressure and
Perturbed force numeric feedback disturbs the control of load using the digital table of EDC580 types of Dol i companies of Germany production to computer
Face formula servo controller can carry out the measurement and control in multiple channels such as load, deformation, displacement, and have self-protection
Program is to prevent the sensor degradation in experiment.
The present invention by the transformation to conventional rock triaxial test machine, increase dynamic disturbances loading system and perturbed force,
Deformation measuring system disclosure satisfy that requirement of the rock mechanics indepth experiment for high-ground stress and simulation exploitation disturbance, maximum
Characteristic is that dynamic disturbances loading system is arranged on ordinary triaxial test machine, and perturbed force can reach 300KN, disturbance
Frequency reaches 70Hz, and final load value can be added to obtain by xial feed with perturbed force.This testing machine structure is simple,
It is easy to use, test field convenient for being generalized to indoor rock mechanics indepth.
Embodiment
With confining pressure 30MPa, it is 12KN, the perturbation action of frequency 5Hz that amplitude is done under 50KN stress levels.
(1) first, control model is converted to disturbance control before the test.
(2) it is placed and secured in after installing rock sample 50 in the test platform on sample presentation trolley 40, by sample presentation trolley 40
It is pushed into the master trip machine centre of location, the data line of each load sensor, axial direction and circumferential extensometer is connected.
(3) open power control cabinet, open TEST softwares simultaneously connect, adjusting sample parameter and extensometer position, after open
Hydraulic servo system, with TEST softwares control base oil cylinder move up, pay close attention at this time main load cylinder 20 fastening screw 22 whether into
Enter the locating slot 42 of 40 bottom of sample presentation trolley, it is ensured that 50 position of rock sample is at center, the mobile conversion after lifting of sample presentation trolley 40
(power about 1KN) is contacted with built-in load sensor 71 to 50 seaming chuck of rock sample.
(4) confining pressure cylinder 60 is put down, and oil-filled into confining pressure cylinder 60 after screwing down, is stopped after oil is full of.
(5) confining pressure gas drive pump plus confining pressure are opened, it is to be added to be loaded onto the rear closing confining pressure gas drive pump of desired value or so, then pass through meter
Confining pressure is transferred to desired value by the operation of calculation machine.
(6) axial stress is increased into 35KN in a manner of spatial load forecasting or Deformation control with TEST softwares, then opened
DOLI softwares simultaneously connect, and first, 75 plus active force (power about 1KN) are applied to disturbance force snesor by disturbing oil cylinder 80.It will disturb
Setting forcing frequency is 5Hz after motivation level is increased to 15KN, and semi-amplitude 12KN, i.e. perturbed force are done often between 3-27KN
Second 5 cycles disturbance (can set disturbance waveform has cosine wave, triangular wave, square wave etc.).
(7) finally obtained data will be added to obtain rock sample 50 in 38- by the value of xial feed with the value of disturbance load
The perturbation action that frequency is 5Hz is done between 62KN.
The product form of the present invention is not limited to this case diagram and embodiment, anyone carries out it similar thinking and fits
Work as changes or modifications, all should be regarded as the patent category for not departing from the present invention.
Claims (9)
1. the three axis loading device of dynamic disturbances servo based on conventional rock test rig, including pedestal, be set on the base plus
Carry master cylinder, the loading frame being connect with the cylinder body of pedestal or load master cylinder, push-down head, the seaming chuck with push-down head cooperation
And confining pressure cylinder mechanism, the grasping part for placing rock sample is formed between seaming chuck and push-down head, loads the piston of master cylinder
Bar corresponds to push-down head setting, it is characterised in that：Further include the large disturbances bar being threaded through in confining pressure cylinder mechanism, the lower end of large disturbances bar
The upper end of the built-in load sensor of connection, large disturbances bar is connected with support plate, and the upper end of support plate connects outer sensor, load
There is frame support beam, outer sensor to be connected to the lower end of support beam, further includes disturbance oil cylinder, disturbs the cylinder body of oil cylinder
It is fixed in support beam, the piston rod for disturbing oil cylinder is vertically arranged and stretches into loading frame, further includes that setting exists
Disturbance force snesor in outer sensor, the lower end for disturbing force snesor are correspondingly provided with and can act on large disturbances bar
The lower end of microvariations bar, the piston rod that the upper end for disturbing force snesor corresponds to disturbance oil cylinder is arranged, and is equipped with through-hole on the supporting plate,
Microvariations bar is arranged in through-holes.
2. the three axis loading device of dynamic disturbances servo based on conventional rock test rig, feature exist as described in claim 1
In：The sensor that the built-in load sensor is 2000KN, the outer sensor are the sensor of 3000KN, the disturbance
Force snesor is the sensor of 500KN.
3. the three axis loading device of dynamic disturbances servo based on conventional rock test rig, feature exist as claimed in claim 2
In：The loading frame includes bottom girder, the first longeron, the second longeron and the support beam, the first longeron and the second longeron
Parallel to erect on bottom girder, the support beam is arranged on the first longeron and the second longeron.
4. the three axis loading device of dynamic disturbances servo based on conventional rock test rig, feature exist as claimed in claim 3
In：Further include sample presentation trolley, the bottom girder is equipped with the first guide rail and the second guide rail for sample presentation carriage walking, the first guide rail and
Second guide rail is arranged in parallel.
5. the three axis loading device of dynamic disturbances servo based on conventional rock test rig, feature exist as claimed in claim 4
In：The upper end of the piston rod of the load master cylinder is equipped with fastening screw, is equipped in the sample presentation trolley and coordinates with fastening screw
Locating slot.
6. the three axis loading device of dynamic disturbances servo based on conventional rock test rig, feature exist as claimed in claim 5
In：The push-down head is fixed on the sample presentation trolley, the seaming chuck by bindiny mechanism and the push-down head removably
It locks together.
7. the three axis loading device of dynamic disturbances servo based on conventional rock test rig, feature exist as claimed in claim 6
In：Confining pressure cylinder mechanism includes can the confining pressure cylinder that moved axially along the large disturbances bar and the pressuring machine being connect with confining pressure cylinder
Structure, the sample presentation trolley are equipped with the support base being arranged with confining pressure cylinder, and the lower end of confining pressure cylinder is locked in support base by bolt
Together, it is equipped with locating rod on support base, the guide groove coordinated with locating rod is correspondingly provided in the lower end of confining pressure cylinder.
8. the dynamic disturbances servo three axis loading device as described in any one of claim 1 to 7 based on conventional rock test rig,
It is characterized in that：The support plate is steel plate, and the microvariations bar is connected to the lower end of the disturbance force snesor.
9. the three axis loading system of dynamic disturbances servo based on conventional rock test rig, including the acquisition of Mechanical loading system, data
System and the strain measurement system for carrying out data processing, Mechanical loading system includes pedestal, the load master being set on the base
Oil cylinder, with pedestal or load master cylinder cylinder body connect loading frame, push-down head, with push-down head coordinate seaming chuck and
Confining pressure cylinder mechanism forms the grasping part for placing rock sample, loads the piston rod pair of master cylinder between seaming chuck and push-down head
Push-down head is answered to be arranged, it is characterised in that：Further include the large disturbances bar being threaded through in confining pressure cylinder mechanism, the lower end connection of large disturbances bar
The upper end of built-in load sensor, large disturbances bar is connected with support plate, and the upper end of support plate connects outer sensor, loading frame
With support beam, outer sensor is connected to the lower end of support beam, further includes disturbance oil cylinder, and the cylinder body for disturbing oil cylinder is fixed
In support beam, the piston rod for disturbing oil cylinder is vertically arranged and stretches into loading frame, further includes being arranged external
Disturbance force snesor in sensor, the lower end for disturbing force snesor are correspondingly provided with can act on large disturbances bar small and disturb
The lower end of lever, the piston rod that the upper end for disturbing force snesor corresponds to disturbance oil cylinder is arranged, and is equipped with through-hole on the supporting plate, small to disturb
Lever is arranged in through-holes, and built-in load sensor, outer sensor, disturbance force snesor and confining pressure cylinder mechanism are connected to
Data collecting system, data collecting system are connect with dependent variable system.
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| CN108760511B (en) | 2023-07-18 |
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