CN107860663A - True triaxial dynamic pressure testing machine and method - Google Patents
True triaxial dynamic pressure testing machine and method Download PDFInfo
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- CN107860663A CN107860663A CN201711068553.0A CN201711068553A CN107860663A CN 107860663 A CN107860663 A CN 107860663A CN 201711068553 A CN201711068553 A CN 201711068553A CN 107860663 A CN107860663 A CN 107860663A
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000002474 experimental method Methods 0.000 claims abstract description 29
- 239000002775 capsule Substances 0.000 claims abstract description 28
- 238000003825 pressing Methods 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims description 15
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 239000004519 grease Substances 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 5
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- 238000012544 monitoring process Methods 0.000 description 2
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- 229910001220 stainless steel Inorganic materials 0.000 description 2
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- 208000005156 Dehydration Diseases 0.000 description 1
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- 239000002828 fuel tank Substances 0.000 description 1
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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
- 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
- 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 invention discloses a kind of true triaxial dynamic pressure testing machine and method, the testing machine includes true triaxial pressure chamber, control system, big principal stress loading system, intermediate principal stress loading system and minor principal stress loading system；The big principal stress loading system and intermediate principal stress loading system include actuator, load sensor and the pressure head being sequentially connected, and the actuator and load sensor are connected with control system respectively；The minor principal stress loading system includes experiment capsule, at least two pieces of guide pressing plates and at least two guide grooves, is corresponded between guide pressing plate, guide groove and pressure head；Every piece of guide pressing plate is in contact with corresponding pressure head, and it is fixed on the outside of experiment capsule, and can be slided in corresponding guide groove, and the experiment capsule is connected with control system.The present invention is simple in construction, easy to use, can avoid the boundary defect during dynamic true triaxial pressure test, makes that sample is complete, test data is complete.
Description
Technical field
The present invention relates to a kind of testing machine and method, especially a kind of true triaxial dynamic pressure testing machine and method, belong to
The pressure test field of soil.
Background technology
True triaxial is the geotechnological instrument for carrying out true triaxial test, according to mechanics principle, any object all by from
X, the power in tri- directions of Y, Z, is called big principal stress, intermediate principal stress and minor principal stress respectively, with symbol σ1、σ2、σ3Represent.Normal
To advise in Geotechnical Environment, ground object is practically at plane strain state, the mechanical property for the power tested in these Geotechnical Environments,
Often handled by axisymmetric problem, i.e. σ2=σ3.Ordinary triaxial test is exactly sample is tried under axisymmetric stress state
Test.
But in actual Geotechnical Environment, the size of three principal stresses suffered by soil is often different, true triaxial test
It is to simulate the soil body by the stress state that in the case of loading, any junior unit is born in the soil body.Research is in principal direction of stress
Under conditions of fixation, principal stress and the relation and strength characteristics of strain, i.e. Soil Constitutive Relation.Sample be generally regular cube or
Cuboid.Mutually perpendicular principal stress plane (X, Y, Z) each to sample applies big principal stress σ respectively during experiment1, intermediate principal stress
σ2And minor principal stress σ3(relation of principal stress is σ1>σ2>σ3), i.e., sample applies each independent three on three orthogonal faces
Individual principal stress σ1、σ2、σ3, determine corresponding principal strain ε1、ε2、ε3With Volume Changes etc..At present, conventional true triaxial test is due to depositing
In boundary defect, cause sample deformation imperfect.
The content of the invention
The invention aims to solve the defects of above-mentioned prior art, there is provided a kind of true triaxial dynamic pressure experiment
Machine, the testing machine structure is simple, easy to use, can avoid the boundary defect during dynamic true triaxial pressure test, make
Sample is complete, test data is complete.
Another object of the present invention is to provide a kind of true triaxial dynamic pressure test method based on above-mentioned testing machine.
The purpose of the present invention can be reached by adopting the following technical scheme that：
A kind of true triaxial dynamic pressure testing machine, including true triaxial pressure chamber, control system, big principal stress loading system,
Intermediate principal stress loading system and minor principal stress loading system, big principal stress loading system are arranged on the Vertical Square of true triaxial pressure chamber
Upwards, intermediate principal stress loading system is arranged in the horizontal direction of true triaxial pressure chamber, and minor principal stress loading system is arranged on very
In triaxial pressure room；
The big principal stress loading system and intermediate principal stress loading system include actuator, the load sensing being sequentially connected
Device and pressure head, the actuator and load sensor are connected with control system respectively；
The minor principal stress loading system includes two experiment capsules, at least two pieces of guide pressing plates and at least two are oriented to
Groove, corresponded between guide pressing plate, guide groove and pressure head；Every piece of guide pressing plate is in contact with corresponding pressure head, and it is fixed on
On the outside of two experiment capsules, and it can be slided in corresponding guide groove, two experiment capsules are connected with control system respectively.
Further, the big principal stress loading system is two, and two big principal stress loading system is arranged on true triaxial
In the vertical direction relative position of balancing gate pit.
Further, the intermediate principal stress loading system is two, and two intermediate principal stress loading systems are arranged on true triaxial
In the horizontal direction relative position of balancing gate pit.
Further, the big principal stress loading system and intermediate principal stress loading system also include being oriented to observing and controlling annex, institute
State guiding observing and controlling annex to be arranged in actuator, and be connected with control system.
Further, the guiding observing and controlling annex includes guide rod and displacement transducer.
Further, it is additionally provided with threading hole in the true triaxial pressure chamber.
Further, actuator pistons, the intermediate principal stress of the true triaxial pressure chamber and big principal stress loading system load
Connected respectively by sealing shroud between the actuator pistons of system.
Further, every piece of guide pressing plate is in contact with corresponding pressure head by ball.
Further, lubricating grease is scribbled on the inside of every piece of guide pressing plate.
Another object of the present invention can be reached by adopting the following technical scheme that：
True triaxial dynamic pressure test method based on above-mentioned testing machine, methods described include：
After sample puts into experiment capsule, control system controls servoBcylinder to experiment capsule topping up, so as to realize to experiment
Sample in capsule applies pressure, and is fed back by pressure sensor, realizes and minor principal stress is automatically controlled；Meanwhile
Control system controls servo valve opening direction, and move actuator by hydraulic strip applies test force to the sample in experiment capsule, and
Fed back by load sensor, realize and big principal stress and intermediate principal stress are automatically controlled.
The present invention has following beneficial effect relative to prior art：
1st, in minor principal stress loading system of the invention, all guide pressing plates are fixed on the outside of experiment capsule, and every piece is led
To guide groove corresponding to pressing plate entrance, can be slided in the guide groove, guide groove serves guide effect to guide pressing plate, is trying
Test in power loading procedure, at sample right angle, two pieces of guide pressing plates of boundary can be moved simultaneously, and two pieces are oriented to pressure in motion process
Plate can thus avoid the boundary defect during dynamic true triaxial pressure test with the mutual changing of the relative positions of the state at right angle,
Make that sample is complete, test data is complete.
2nd, big principal stress loading system and intermediate principal stress loading system of the invention, which can also be set, is oriented to observing and controlling annex, can
The stroke of actuator is play the guiding role and monitored with the piston to actuator.
3rd, threading hole can also be set in true triaxial pressure chamber of the invention, can be by load sensor by threading hole
Output signal is passed out of true triaxial pressure chamber to control system, and control system can be by threading hole to true triaxial
Balancing gate pit carries out topping up and pressurization.
4th, the actuator pistons of true triaxial pressure chamber of the invention and big principal stress loading system, intermediate principal stress loading system
Actuator pistons between connected respectively by sealing shroud so that true triaxial pressure chamber is in sealing state, and can be true three
Apply big principal stress and intermediate principal stress under the sealing state of axle balancing gate pit to sample, do not influenceed by external force.
5th, in minor principal stress loading system of the invention, every piece of guide pressing plate is in contact with corresponding pressure head by ball,
To reduce friction.
6th, exist in minor principal stress loading system of the invention, between all guide pressing plates and mutually slide, therefore at every piece
Lubricating grease is scribbled on the inside of guide pressing plate, to reduce the friction between them.
Brief description of the drawings
Fig. 1 is the true triaxial dynamic pressure testing machine structure block diagram of the embodiment of the present invention 1.
Fig. 2 is the front view that the true triaxial dynamic pressure testing machine of the embodiment of the present invention 1 is arranged on board.
Fig. 3 is the enlarged drawing at A in Fig. 1.
Fig. 4 is the side view that the true triaxial dynamic pressure testing machine of the embodiment of the present invention 1 is arranged on board.
Fig. 5 is the first big principal stress loading system structure chart of the embodiment of the present invention 1.
Fig. 6 is the second largest principal stress loading system structure chart of the embodiment of the present invention 1.
Fig. 7 is the first intermediate principal stress loading system structure chart of the embodiment of the present invention 1.
Fig. 8 is the second intermediate principal stress loading system structure chart of the embodiment of the present invention 1.
Wherein, 1- true triaxial pressure chambers, 101- threading holes, 2- control systems, the big principal stress loading systems of 3- first, 301-
First actuator, the load sensors of 302- first, the pressure heads of 303- first, the locking nuts of 304- first, the guide rods of 305- first,
The displacement transducers of 306- first, the sealing shrouds of 307- first, the second largest principal stress loading systems of 4-, the actuator of 401- second, 402-
Second load sensor, the pressure heads of 403- second, the locking nuts of 404- second, the guide rods of 405- second, 406- second displacements sensing
Device, the sealing shrouds of 407- second, 5- the first intermediate principal stress loading systems, the actuator of 501- the 3rd, the load sensors of 502- the 3rd,
The pressure heads of 503- the 3rd, the locking nuts of 504- the 3rd, the guide rods of 505- the 3rd, 506- triple motion sensors, it is main in 6- second should
Force loading system, the actuator of 601- the 4th, the load sensors of 602- the 4th, the pressure heads of 603- the 4th, the locking nuts of 604- the 4th,
The guide rods of 605- the 4th, the displacement transducers of 606- the 4th, 7- minor principal stress loading systems, 701- experiment capsules, 702- are oriented to pressure
Plate, 703- guide grooves, 704- latch segments, 8- samples, 9- balls, 10- boards.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
Embodiment 1：
As shown in Figure 1 to 4, a kind of true triaxial dynamic pressure testing machine is present embodiments provided, the pressure testing machine bag
Include in true triaxial pressure chamber 1, control system 2, the first big principal stress loading system 3, second largest principal stress loading system 4, first
Principal stress loading system 5, the second intermediate principal stress loading system 6 and minor principal stress loading system 7, the first big principal stress loading system
3rd, second largest principal stress loading system 4, the first intermediate principal stress loading system 5, the second intermediate principal stress loading system 6 and minor principal stress
Loading system 7 is connected with control system 2 respectively.
The first big principal stress loading system 3 and second largest principal stress loading system 4 are σ1Direction loading system, if
Put in the vertical direction relative position of true triaxial pressure chamber 1, wherein the first big principal stress loading system 3 is located at true triaxial pressure
The upper end of room 1, and enter on the outside of the upper end of true triaxial pressure chamber 1 in true triaxial pressure chamber 1, second largest principal stress loading system
4 are located at the lower end of true triaxial pressure chamber 1, and enter from the lower end outside of true triaxial pressure chamber 1 in true triaxial pressure chamber 1.
As shown in Figure 5 and Figure 6, the structure phase of the first big principal stress loading system 3 and second largest principal stress loading system 4
Together, the first big principal stress loading system 3 includes the first actuator 301, the first load sensor 302 being sequentially connected from top to bottom
With the first pressure head 303, connect wherein the first load sensor 302 is fixed by the first locking nut 304 and the first actuator 301
Connect；Second largest principal stress loading system 4 includes the second actuator 401, the second load sensor 402 being sequentially connected from top to bottom
With the second pressure head 403, connect wherein the second load sensor 402 is fixed by the second locking nut 404 and the second actuator 401
Connect；First actuator 301, the second actuator 401, the first load sensor 302 and the second load sensor 402 respectively with control
System 2 connects, and control system 2 drives the first actuator 301 and the second actuator by controlling servo valve opening direction, by hydraulic pressure
401 pairs of samples 8 apply test force, and are fed back by the first load sensor 302 and the second load sensor 402, realize
Big principal stress is automatically controlled.
Further, the first big principal stress loading system 3 also includes the first guiding observing and controlling annex, and first is oriented to observing and controlling annex
It is arranged in the first actuator 301, specifically includes the first guide rod 305 and the first displacement transducer 306, the first guide rod 305
For being play the guiding role to the piston of the first actuator 301, the first displacement transducer 306 is connected with control system, for monitoring
The stroke of first actuator 301；Second largest principal stress loading system 4 also includes second and is oriented to observing and controlling annex, and second is oriented to observing and controlling
Annex is arranged in the second actuator 401, specifically includes the second guide rod 405 and second displacement sensor 406, the second guide rod
405 are used to play the guiding role to the piston of the second actuator 401, and second displacement sensor 406 is connected with control system 2, is used for
Monitor the stroke of the second actuator 401.
Preferably, the first actuator 301 is connected by the first sealing shroud 307 with true triaxial pressure chamber 1, the second actuator
401 pass through the second sealing shroud 407 and true triaxial pressure chamber 1 so that true triaxial pressure chamber 1 is in sealing state, and can be true
σ is applied to sample 8 under the sealing state of triaxial cell 11The test force in direction.
It will be appreciated by persons skilled in the art that the true triaxial dynamic pressure testing machine of the present embodiment can also only be set
One big principal stress loading system, the big principal stress loading system can be arranged on the upper end or lower end of true triaxial pressure chamber 1, such as
Fruit is arranged on the upper end of true triaxial pressure chamber 1, then fixes the lower end of true triaxial pressure chamber 1, if placed at true triaxial pressure
The lower end of room 1, then the upper end of true triaxial pressure chamber 1 is fixed.
The first intermediate principal stress loading system 5 and the second intermediate principal stress loading system 6 are σ2Direction loading system, if
Put in the horizontal direction relative position of true triaxial pressure chamber 1, wherein the first intermediate principal stress loading system 5 is located at true triaxial pressure
The left end of room 1, and enter on the outside of the left end of true triaxial pressure chamber 1 in true triaxial pressure chamber 1, the second intermediate principal stress loading system
6 are located at the right-hand member of true triaxial pressure chamber 1, and enter on the outside of the right-hand member of true triaxial pressure chamber 1 in true triaxial pressure chamber 1.
As shown in Figure 7 and Figure 8, the structure of the first intermediate principal stress loading system 5 and the second intermediate principal stress loading system 6 and the
One big principal stress loading system 3, the structure of second largest principal stress loading system 4 are identical, and the first intermediate principal stress loading system 5 includes
The 3rd actuator 501, the 3rd load sensor 502 and the 3rd pressure head 503 being from left to right sequentially connected, wherein the 3rd load passes
Sensor 502 is fixedly connected by the 3rd locking nut 504 with the 3rd actuator 301；Second intermediate principal stress loading system 6 include from
Right the 4th actuator 601, the 4th load sensor 602 and the 4th pressure head 603 being sequentially connected to a left side, wherein the 4th load sensing
Device 602 is fixedly connected by the 4th locking nut 604 with the 4th actuator 601；3rd actuator 501, the 4th actuator 601,
3rd load sensor 502 and the 4th load sensor 602 are connected with control system 2 respectively, and control system 2 is by controlling servo
Valve opening direction, drive the 3rd actuator 501 and the 4th actuator 601 to apply test force to sample 8 by hydraulic pressure, and pass through the 3rd
The load sensor 602 of load sensor 502 and the 4th is fed back, and realizes and intermediate principal stress is automatically controlled.
Further, the first intermediate principal stress loading system 5 also includes the 3rd guiding observing and controlling annex, and the 3rd is oriented to observing and controlling annex
It is arranged in the 3rd actuator 501, specifically includes the 3rd guide rod 505 and triple motion sensor 506, the 3rd guide rod 505
For being play the guiding role to the piston of the 3rd actuator 501, triple motion sensor 506 is connected with control system 2, for monitoring
The stroke of 3rd actuator 501；Second intermediate principal stress loading system 6 also includes the 4th and is oriented to observing and controlling annex, and the 4th is oriented to observing and controlling
Annex is arranged in the 4th actuator 601, specifically includes the 4th guide rod 605 and the 4th displacement transducer 606, the 4th guide rod
605 are used to play the guiding role to the piston of the 4th actuator 601, and the 4th displacement transducer 606 is connected with control system 2, is used for
Monitor the stroke of the 4th actuator 601.
Preferably, the 3rd actuator 501 is connected by the 3rd sealing shroud 507 with true triaxial pressure chamber 1, the 4th actuator
601 pass through the 4th sealing shroud 607 and true triaxial pressure chamber 1 so that true triaxial pressure chamber 1 is in sealing state, and can be true
σ is applied to sample 8 under the sealing state of triaxial cell 12The test force in direction.
It will be appreciated by persons skilled in the art that the true triaxial dynamic pressure testing machine of the present embodiment can also only be set
One intermediate principal stress loading system, the intermediate principal stress loading system can be arranged on the left or right of true triaxial pressure chamber 1, such as
Fruit is arranged on the left end of true triaxial pressure chamber 1, then fixes the right-hand member of true triaxial pressure chamber 1, if placed at true triaxial pressure
The right-hand member of room 1, then the left end of true triaxial pressure chamber 1 is fixed.
In the present embodiment, above-mentioned first actuator 301, the second actuator 401, the 3rd actuator 501 and the 4th start
Device 601 uses dynamic actuator, and circumferential section is fixed in true triaxial pressure chamber 1.
Minor principal stress loading system 7 is σ3Direction loading system, it is arranged in true triaxial pressure chamber 1, can from Fig. 3
To see, minor principal stress loading system 7 includes two experiment 701, four pieces of guide pressing plates 702 of capsule and four guide grooves 703, and four
Block guide pressing plate 702 and four guide grooves 703 correspond, and four pieces of guide pressing plates 702 correspond to the first pressure head 303, second respectively
Pressure head 403, the 3rd pressure head 503 and the 4th pressure head 603, pass through the pressure head 303 of ball 9 and first, the second pressure head the 403, the 3rd respectively
The pressure head 603 of pressure head 503 and the 4th is in contact, to reduce friction；Four pieces of guide pressing plates 702 are arranged on the outside of experiment capsule 701, enter
One step is locked by latch segment 704, makes experiment capsule 701 when filling sample 8, and fixation is played to four pieces of guide pressing plates 702
Effect, and guide groove 703 corresponding to every piece of entrance of guide pressing plate 702, can be slided, guide groove 703 is to leading in the guide groove 703
Guide effect is served to pressing plate 702；Mutually slided due to existing between four pieces of guide pressing plates 702, therefore pressure is oriented at every piece
The inner side of plate 702 scribbles lubricating grease, to reduce the friction between them；Two experiment capsules 701 are connected with control system 2, are controlled
System 2 processed is by controlling servoBcylinder to the topping up of capsule 701 is tested, so as to realize that the sample into experiment capsule 701 applies pressure,
And fed back by pressure sensor, realize and minor principal stress is automatically controlled.
In the present embodiment, true triaxial pressure chamber 1 is arranged on board 10, further, is also set in true triaxial pressure chamber 1
There is threading hole 101, can be by load sensor (the first load sensor 302, the second load sensor by threading hole 101
402nd, the 3rd load sensor 502 and the 4th load sensor 602) output signal passed out of true triaxial pressure chamber 1
To control system 2, and control system 2 can carry out topping up and pressurization by threading hole 101 to true triaxial pressure chamber 1；More enter
One step, the front and rear sides of true triaxial pressure chamber 1 are provided with observation panel, the convenient whole experiment process of observation；True triaxial pressure chamber 1 is excellent
Choosing is made of stainless steel material.
In the present embodiment, control system 2 is the control centre of testing machine, and it can be arranged in board 10, further
Ground, control system 2 include computer, Full-digital servo controller, servomotor, power amplifier, servoBcylinder, servo valve, beaten
Print machine etc., Full-digital servo controller, experiment overall process can be achieved and automatically control, can carry out the collection of test data, processing,
Storage, reproduce and draw trial curve, can real-time display test data or trial curve, and trial curve is printed by printer
And test report；σ is controlled using Full-digital servo controller respectively1、σ2、σ3Direction loading system, and it is original-pack to be equipped with PANASONIC
Inlet servo motor and power amplifier realize full SERVO CONTROL as executive component so that whole testing machine automation journey
Spend that high, reliable and stable, fault rate is low；σ is loaded by the way of machinery and capsule1、σ2、σ3It is real simultaneously to the central compressed of sample 8
Show the central point of sample 8 during experiment to remain stationary as.
As Figure 1-Figure 8, the present embodiment additionally provides a kind of true triaxial dynamic pressure test method, and this method is based on upper
Testing machine realization is stated, including：
When sample 8 put into experiment capsule 702 after, control system control servoBcylinder to experiment the topping up of capsule 8, so as to realize to
The sample 8 tested in capsule 702 applies pressure, and is fed back by pressure sensor, realizes the automatic control to minor principal stress
System；Meanwhile control system 2 controls servo valve opening direction, and actuator (the first actuator 301, the second start are moved by hydraulic strip
Device 401, the 3rd actuator 501 and the 4th actuator 601) test force is applied to the sample 8 in experiment capsule 702, and by negative
Lotus sensor (the first load sensor 302, the second load sensor 402, the 3rd load sensor 502 and the 4th load sensing
Device 602) fed back, realize and big principal stress and intermediate principal stress are automatically controlled.
The testing machine performance parameter of the present embodiment is as follows：
1) rigidity ＞ 5GN/M；
2) big principal stress σ1=5MPa, intermediate principal stress σ2=5MPa, minor principal stress σ3=2Mpa；
3) specimen size：75mm×75mm×150mm；
4) stainless steel true triaxial pressure chamber, fore-and-aft direction set observation panel；
5) electro-hydraulic servo actuator four, electro-hydraulic servo confined pressure are not less than 2Mpa；
6) electro-hydraulic servo pore pressure (back-pressure measurement) loading is not less than 2Mpa；
7) squelch type Hydraulic servo system：A, 19 liters/min are at least, 10HP；B, constant output pressure 25Mpa；C, fuel tank holds
150 liters of amount.
The testing machine major function of the present embodiment is as follows：
1) in three corresponding force (σ1、σ2、σ3) effect under dynamic compressive test；
2) accurately measure in σ1Direction is applied to the deformation values of the force value and sample on sample；
3) accurately measure in σ2Direction is applied to the deformation values of the force value and sample on sample；
4) accurately measure in σ3Direction is applied to the deformation values of the pressure value and sample on sample；
5) computer automatically controls to power (pressure) and deformation；
6) kept when power (pressure) is long；
7) collection, processing, storage, reproduction and the drafting trial curve of test data；
8) real-time display test data or trial curve；
9) trial curve and test report are printed；
10) Volume Changes (displacement of measure sample) of sample are measured；
11) hole water stress is measured；
12)σ1、σ2、σ3Free routing inputs.
In summary, testing machine structure of the invention is simple, easy to use, can avoid in dynamic true triaxial pressure test
During boundary defect, make that sample is complete, test data is complete.
It is described above, patent preferred embodiment only of the present invention, but the protection domain of patent of the present invention is not limited to
This, any one skilled in the art is in the scope disclosed in patent of the present invention, according to the skill of patent of the present invention
Art scheme and its inventive concept are subject to equivalent substitution or change, belong to the protection domain of patent of the present invention.
Claims (10)
- A kind of 1. true triaxial dynamic pressure testing machine, it is characterised in that：Including true triaxial pressure chamber, control system, big principal stress Loading system, intermediate principal stress loading system and minor principal stress loading system, big principal stress loading system are arranged on true triaxial pressure In the vertical direction of room, intermediate principal stress loading system is arranged in the horizontal direction of true triaxial pressure chamber, minor principal stress loading system System is arranged in true triaxial pressure chamber；The big principal stress loading system and intermediate principal stress loading system include be sequentially connected actuator, load sensor and Pressure head, the actuator and load sensor are connected with control system respectively；The minor principal stress loading system includes two experiments capsule, at least two pieces of guide pressing plates and at least two guide grooves, leads Corresponded between pressing plate, guide groove and pressure head；Every piece of guide pressing plate is in contact with corresponding pressure head, and it is fixed on two examinations Test on the outside of capsule, and can be slided in corresponding guide groove, two experiment capsules are connected with control system respectively.
- A kind of 2. true triaxial dynamic pressure testing machine according to claim 1, it is characterised in that：The big principal stress loading System is two, and two big principal stress loading system is arranged in the vertical direction relative position of true triaxial pressure chamber.
- A kind of 3. true triaxial dynamic pressure testing machine according to claim 1, it is characterised in that：The intermediate principal stress loading System is two, and two intermediate principal stress loading systems are arranged in the horizontal direction relative position of true triaxial pressure chamber.
- A kind of 4. true triaxial dynamic pressure testing machine according to claim 1, it is characterised in that：The big principal stress loading System and intermediate principal stress loading system also include being oriented to observing and controlling annex, and the guiding observing and controlling annex is arranged in actuator, and with Control system connects.
- A kind of 5. true triaxial dynamic pressure testing machine according to claim 4, it is characterised in that：The guiding observing and controlling annex Including guide rod and displacement transducer.
- A kind of 6. true triaxial dynamic pressure testing machine according to claim 1, it is characterised in that：The true triaxial pressure chamber On be additionally provided with threading hole.
- A kind of 7. true triaxial dynamic pressure testing machine according to claim 1, it is characterised in that：The true triaxial pressure chamber Actuator pistons with big principal stress loading system, pass through sealing shroud respectively between the actuator pistons of intermediate principal stress loading system Connection.
- A kind of 8. true triaxial dynamic pressure testing machine according to claim 1, it is characterised in that：Every piece of guide pressing plate with it is right The pressure head answered is in contact by ball.
- A kind of 9. true triaxial dynamic pressure testing machine according to claim 1, it is characterised in that：On the inside of every piece of guide pressing plate Scribble lubricating grease.
- 10. a kind of true triaxial dynamic pressure test method based on any one of the claim 1-9 testing machines, its feature exist In：Methods described includes：After sample is put between two experiment capsules, control servoBcylinder applies to experiment capsule topping up so as to realize to sample Pressure, and fed back by pressure sensor, realize and minor principal stress is automatically controlled；Meanwhile control servo valve openings To, actuator is moved by hydraulic strip test force is applied to sample, and fed back by load sensor, realize to big principal stress With automatically controlling for intermediate principal stress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711068553.0A CN107860663A (en) | 2017-11-03 | 2017-11-03 | True triaxial dynamic pressure testing machine and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711068553.0A CN107860663A (en) | 2017-11-03 | 2017-11-03 | True triaxial dynamic pressure testing machine and method |
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| WO2022134187A1 (en) * | 2020-12-23 | 2022-06-30 | 山东黄金矿业科技有限公司深井开采实验室分公司 | Rock true triaxial dynamic compression shear test apparatus and method in deep complex structure conditions |
| US11761865B2 (en) | 2020-12-23 | 2023-09-19 | Deep Well Mining Laboratory Branch Of Shandong Gold Mining Technology Co., Ltd | Rock true triaxial dynamic compression-shear test equipment and method under deep complex structure conditions |
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