CN105181471B - A kind of the rock true triaxial test system and method for band CT real time scan systems - Google Patents
A kind of the rock true triaxial test system and method for band CT real time scan systems Download PDFInfo
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- CN105181471B CN105181471B CN201510577392.2A CN201510577392A CN105181471B CN 105181471 B CN105181471 B CN 105181471B CN 201510577392 A CN201510577392 A CN 201510577392A CN 105181471 B CN105181471 B CN 105181471B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 23
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
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Abstract
The present invention relates to a kind of the rock true triaxial test system and method for band CT real time scan systems, including true triaxial pressure cell, true triaxial main machine frame, loading device, and CT scan device；True triaxial main machine frame includes bottom plate, top plate and is supported in bottom plate and column；Loading device includes counterforce device, and jack and measurement apparatus；Pressure cell, column, and the counterforce device in CT scan device scanning area is made by carbon fibre material, the present invention uses the horizontal loading system of particular design to CT scan area, carbon fiber force transmitting board and column, the problem of traditional true triaxial test machine can not be penetrated by solving X-ray, overcome the drawbacks of needing to carry out CT scan experiment after rock sample is removed from the unloading of true triaxial test platform in traditional experiment, realize the real-time cooperation that rock true triaxial is tested with CT scan, for the microfissure and the real-time extension of Micro-v oid in rock under research true triaxial stress state, Evolution has great importance.
Description
Technical field
The invention belongs to rock mechanics and rock test field, and in particular to a kind of rock of band CT real time scan systems is true
Triaxial test system and method.
Background technology
In the case of the real triaxial stress state of True Triaxial Apparatus energy model engineering rock mass, the different principal stresses of analysis three
The intensity and deformation characteristic of rock, master can be applied independently by certain change on each face of rock sample during true triaxial test should
Power, and measure corresponding principal strain, realizes various complicated stress loading paths, and then more adding system, comprehensively, in depth discloses
The deformation-failure character of rock.
The destruction of rock mass, be often as inside microfissure and Micro-v oid crack initiation, develop and finally be mutually communicated to be formed
Caused by macroscopic cracking.Therefore, microfissure and extension, the Evolution of Micro-v oid in research rock mass, understand fully that rock mass damage loses
Steady mechanism, it is significant for rock engineering and the analysis of rock body quality of mine engineering stability etc.., can using CT scan technology
To carry out comprehensive monitoring to the structure change inside rock sample, localized variation, slight change and the change of rock sample internal structure are understood
Change trend, grasps character of the rock sample under different stress conditions.
Using actual triaxial testing apparatus and coordinate CT real time scans, the rock under real triaxial stress state can be studied
Intensity and deformation characteristic, and according to the image feature of CT images, analysis rock mesostructure and its change procedure explain macroscopic view
Strength Changes and the mechanism of deformation, disclose rock interior fracture breaks Evolution, are microexamination and the engineer applied of rock
Research provides reliable scientific basis.
It is related with the present patent application to have：
1. a kind of rock true triaxial test loading system disclosed in Chinese patent CN201410089591.4, including base,
The base is connected with many pull bar bottoms, simple in construction, easily operation, and floor space is small, and single shaft, twin shaft, three axles can be achieved
Load test, and test error is small.
2. it is related to a kind of high-ground stress true three-dimensional loading model experiment system disclosed in Chinese patent CN200810016641.0
System, with synchronization, independence, high-ground stress loading, loading automaticity and loading accuracy are high, and loading function is more, realizes cavern
It is axially loaded to punch, loading system rigidity is high, resistance to overturning is good, it is simple to operate the advantages of.
Above-mentioned two patent relates generally to rock macroscopic failure under the conditions of research true triaxial, due to the overall frame of experimental provision
Frame, 6 face load plates of rock use metal material, and the ray that CT machines are sent can not be passed through, it is impossible to which realization adds to rock true triaxial
Real-time CT scan under the conditions of load.For understand true triaxial under the conditions of rock interior evolution law of cracks, traditional way be by
Rock sample carries out CT scan test after being removed from true triaxial bracket loading test platform, but the method makes rock sample load have a certain amount of after laying down
The accuracy of springback influence experiment.
3. the microcomputer controlled electro-hydraulic servo with CT scan imaging system disclosed in Chinese patent CN201320462332.2 is more
Field coupling rock triaxial test machine.Including experiment machine host, Based on Electro-hydraulic Loading Servo System, confined pressure pore pressure servo loading system, close
Ring TT＆C system, computer control and processing system, CT scan system, temperature control system and rotatable platform etc..The system architecture
Simply, measurement data is accurate and easy to operate, effectively physics characteristic of the reflection rock under axial direction and confined pressure effect.
4. a kind of balancing gate pit for CT triaxial tests disclosed in Chinese patent CN201310471580.8, for coordinating
Micro-focus CT are observed and the thin sight of research sample mechanics Penetration Signature under normal triaxial pressure is developed.
Although the experimental system involved by above two patent can realize the CT real time scans of rock sample loading, it is related to
Mainly normal triaxial is false Triaxial tester, and the fundamental drawback of ordinary triaxial test device is that axle can only be in rock sample
Intensity and deformation rule under symmetrical stress state are tested, and can not represent the general stress suffered by rock reality
State is true triaxial.Accordingly, it would be desirable to which designing a kind of can coordinate the rock actual triaxial testing apparatus of CT real time scans.
The content of the invention
True triaxial loading is carried out to rock in the case of CT is monitored in real time in order to realize, a kind of band CT of present invention design is real-time
The rock true triaxial test system and method for scanning system, carry out study of rocks failure evolvement rule under true triaxial stress state.
To achieve the above object, its technical scheme is as follows：A kind of rock true triaxial test system of band CT real time scan systems
System, include contain rock sample true triaxial pressure cell, carry true triaxial pressure cell true triaxial main machine frame, around with
And apply stressed loading device on three axial directions to rock sample up and down, and true triaxial shape can be carried out to the rock sample in pressure cell
The CT scan device of real time scan under state, CT scan device includes the CT radioactive sources for being correspondingly arranged at pressure cell both sides and CT detections
Device；The true triaxial main machine frame includes bottom plate, top plate and the column being supported between bottom plate and top plate；The loading device
Including the counterforce device outside pressure cell, and the jack and detection jack pressed by counterforce device to pressure cell
The size that exerts a force and the measurement apparatus of displacement；The pressure cell, column, and the counter-force dress in CT scan device scanning area
Put and be made by the carbon fibre material that can be penetrated by X-ray.
Counterforce device around on two lateral shafts includes two relative force transmitting boards respectively, positioned at power transmission
Backing plate between plate and pressure cell, and the horizontal counter-force for the upper and lower end of force transmitting board to be connected with true triaxial main machine frame
Wall；Wherein, at least side force transmitting board is movable force transmitting board, and the horizontal counter force wall of movable force transmitting board connection is slide block structure, and true
Three axle main machine frame sliding fits are connected, and the outside upper and lower end of movable force transmitting board, which is symmetrical arranged, can keep the synchronous transverse direction loaded
Motor-driven jack, transverse electric jack is provided with cross measure device, and transverse electric jack is consolidated with true triaxial main machine frame
Even.
The horizontal counter force wall is set to two sections, and its distance is not less than the height of pressure cell, respectively with true triaxial main frame
Top plate and the bottom plate connection of framework.
Connecting hole is correspondingly provided with the horizontal counter force wall and force transmitting board, and is connected both through connecting hole by connector
Connect.
The middle inside of the force transmitting board is the arc of evagination, and the carbon fiber backing plate being in contact with it uses arc-shaped recess knot
Structure, fits like a glove therebetween, and is bonded by epoxy resin structural adhesive.
The force transmitting board is brought into close contact and formed by how block-shaped, size identical plate body, passes through displacement constraint between plate body
Device is fixed.
The displacement constraint device is the connecting rod for being arranged on the cranse at force transmitting board two ends or being horizontally through multilayer plate body, even
Extension bar two ends are fastened by nut.
Bonded between each plate body of the force transmitting board by epoxy resin structural adhesive.
The size of each piece of plate body of the composition force transmitting board is 400mm × 80mm × 10mm.
The transverse electric jack is connected with synchronous Loading Control System.
Force transmitting board and cushion block in CT scan device scanning area are made up of carbon fibre material.
Counterforce device on longitudinal axis includes the backing plate positioned at the upper and lower side of pressure cell, and positioned at top backing plate and
Vertical cushion block between top plate；Vertical motor-driven jack, vertical motor-driven jack and bottom plate are set between bottom backing plate and bottom plate
It is connected, and vertical motor-driven jack arranges vertical measurement apparatus.
Bottom plate, top plate, upper lower bolster and vertical cushion block beyond the scanning area of CT scan device use steel
It is made, and makees modifier treatment.
The size of the backing plate is 60mm × 60mm × 10mm.
The pressure cell is made up of six pieces of carbon fiber boards by way of mutually buckleing, and rock is placed in pressure cell and and box body
Inwall is in contact, and lubricant is smeared between the joining place and box body and rock between plate and plate.
The size of six pieces of plate bodys in the decomposition pressure box is 120mm × 120mm × 10mm.
The measurement apparatus is made up of pressure sensor and displacement transducer.
The column two ends are wrapped up with high tensile metal sleeve, are bonded using epoxy resin structural adhesive therebetween, high-strength
Metal sleeve penetrates bottom plate or top plate and welded respectively with bottom plate and top plate, and column top uses wedge-type shape.
The column diameter of section is 40mm.
A kind of rock true triaxial test method of band CT real time scan systems, comprises the following steps：
1）By left and right, front and rear transverse electric jack, vertical motor-driven jack is pressurized to 50kN respectively；
2）Transverse electric jack before and after by setting, makes front and rear on-load pressure value keep 50kN constant, and left and right is horizontal
Motor-driven jack, vertical motor-driven jack is pressurized to 100kN respectively；
3）By setting left and right, front and rear transverse electric jack, left and right, front and rear on-load pressure value is set to keep 100kN constant,
Vertical on-load pressure value is kept automatically after vertical motor-driven jack, every grade of increase 5kN, every grade of stabilization are set by graded loading way
Constant, and carry out CT scan, vertical motor-driven jack starts next stage supercharging afterwards, and carries out CT scan, repeat until
The rock failure mechanism of rock, CT scan device obtains the image of whole process of the test；
Synchronous Loading Control System automatically adjusts the rotating speed of transverse electric jack to change it in whole experiment process
Momentum is entered in displacement, it is ensured that movable carbon fiber force transmitting board is in vertical state all the time, is uniformly distributed side force suffered by rock；Phase
Between cross measure device, vertical measurement apparatus record the change in displacement of three loading directions respectively.
The positive effect of the present invention：Horizontal loading system, carbon fiber biography of the present invention to CT scan area using particular design
Power plate and carbon fiber column, the problem of traditional true triaxial test machine can not be penetrated by solving X-ray, be overcome in traditional experiment
The drawbacks of carrying out CT scan experiment after need to rock sample be removed from the unloading of true triaxial test platform, realizes rock true triaxial and CT scan
The real-time cooperation of experiment, for the microfissure and the real-time extension of Micro-v oid in rock under research true triaxial stress state, develops
Rule has great importance.
Brief description of the drawings
Fig. 1 is general assembly structural representation of the present invention.
Fig. 2 is that the present invention removes top plate internal structure schematic diagram.
Fig. 3 is general assembly structural profile schematic diagram of the present invention.
Fig. 4 is that carbon fiber post end of the present invention fixes schematic diagram.
Fig. 5 is the fixed schematic diagram of carbon fiber force transmitting board assembling of the present invention.
Fig. 6 is mutual button schematic diagram between six pieces of carbon fiber boards of the invention.
In figure, 1- bases；2- bottom plates；The vertical motor-driven jacks of 3-；The vertical measurement apparatus of 4-；5- backing plates；6. pressure cell；7-
Vertical cushion block；8- top plates；9- columns；10- transverse direction counter force walls；11- force transmitting boards；13- transverse electric jack；14- cross measures
Device；15- synchronization Loading Control Systems；16- metal sleeves；17-CT radioactive sources；18-CT detectors；19- lubricants；20-
Move restraint device, 21. epoxy resin structural adhesives.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of rock true triaxial test system of band CT real time scan systems, including contain rock
The true triaxial pressure cell 6 of sample, the pressure cell 6 is made up of six pieces of carbon fiber boards by way of mutually buckleing, and rock is placed on pressure
It is in contact in box 6 and with inboard wall of cartridge, lubricant 19 is smeared between the joining place and box body and rock between plate and plate；Composition
The size of 6 six pieces of plate bodys is 120mm × 120mm × 10mm in pressure cell；
Carry the true triaxial main machine frame of true triaxial pressure cell 6, the true triaxial main machine frame include bottom plate 2, top plate 8 with
And the column 9 between bottom plate 2 and top plate 8 is supported in, bottom plate 2 is arranged on base 1；Column 9 is fine using the carbon of high-tensile
Dimension（T800）Material is made, and its diameter of section is 40mm；It is anisotropic material in view of carbon fiber column 9, horizontal shearing resistance is strong
Degree is relatively low, easily occurs compression shear breakoff phenomenon in its end, the two ends of column 9 are wrapped up with high tensile metal sleeve 16, made therebetween
Bonded with epoxy resin structural adhesive 21, high tensile metal sleeve 16 penetrates bottom plate 2 or top plate 8 and welded respectively with bottom plate 2 and top plate 8
Connect, the top of column 9 uses wedge-type shape, enhances post end resistance to compression and shear behavior；The bottom plate 2 and top plate 8 are used
Q460 high-strength steels are made；
Stressed loading device is applied to rock sample in three axial directions, the loading device includes being located at outside pressure cell 6
Counterforce device, and the jack and detection jack pressed to pressure cell 6 by counterforce device exert a force size and displacement
Measurement apparatus, the measurement apparatus includes cross measure device 14 and vertical measurement apparatus 4, and measurement apparatus is by pressure sensing
Device, displacement transducer and data collecting system composition；Counterforce device around on two lateral shafts includes two respectively
Individual relative force transmitting board 11, the backing plate 5 between force transmitting board 11 and pressure cell 6, and for by the upper and lower end of force transmitting board 11
The horizontal counter force wall 10 being connected with true triaxial main machine frame；The horizontal counter force wall 10 is set to two sections, respectively with true triaxial
The top plate 8 and bottom plate 2 of main machine frame are connected；Upper, lower horizontal to counter force wall 10 be located at pressure cell 6 upper and lower sides, upper and lower counter force wall it
Between distance be not less than pressure cell 6 height；Connecting hole is correspondingly provided with horizontal counter force wall 10 and force transmitting board 11, and passes through connection
Part connects both through connecting hole；Wherein, at least side force transmitting board 11 is movable force transmitting board 11, what movable force transmitting board 11 was connected
Horizontal counter force wall 10 is slide block structure, is connected with true triaxial main machine frame sliding fit, the outside upper and lower end pair of movable force transmitting board 11
The synchronous transverse electric jack 13 loaded can be kept by claiming to set, and transverse electric jack 13 is provided with cross measure device 14,
And transverse electric jack 13 is connected with true triaxial main machine frame；The transverse electric jack 13 is connected with synchronous Loading Control
System 15, synchronous Loading Control System 15 receives the displacement data that upper, lower horizontal is gathered to measurement apparatus 14, upper and lower when monitoring
When the displacement of two transverse electric jack 13 is inconsistent, synchronous Loading Control System 15 reduces the larger one end of displacement automatically
The rotating speed of transverse electric jack 13, makes the reduction of its displacement output quantity speedup, while increasing the laterally electricity of the smaller one end of displacement
The dynamic rotating speed of jack 13, improves its displacement output quantity speedup, causes the two to be rapidly achieved balance by this regulation, whole
In horizontal loading procedure, upper and lower two transverse electric jack 13 are made to keep synchronous, it is ensured that carbon fiber force transmitting board 11 is in all the time
Vertical state, so that the pressure that carbon fiber force transmitting board 11 is acted on true triaxial pressure cell 6 is uniformly distributed；The force transmitting board
11 middle inside is the arc of evagination, improves the bending resistance of carbon fiber force transmitting board 11, and the carbon fiber backing plate 5 being in contact with it is adopted
Arc-shaped recess structure is used, is fit like a glove therebetween, and is bonded by epoxy resin structural adhesive 21；The force transmitting board 11 is by polylith
Shape, size identical plate body are closely combined and formed, and are fixed between plate body by displacement constraint device 20；The displacement constraint dress
Put 20 to be arranged on the cranse at the two ends of force transmitting board 11 or be horizontally through the connecting rod of multilayer plate body, connecting rod two ends are tight by nut
Gu；Bonded to increase between the intensity of force transmitting board 11, each plate body of the force transmitting board 11 by epoxy resin structural adhesive；It is located at
Counterforce device on longitudinal axis includes the backing plate 5 positioned at the upper and lower side of pressure cell 6, and between top backing plate 5 and top plate 8
Vertical cushion block 7；Vertical motor-driven jack 3 is set between bottom backing plate 5 and bottom plate 2, and vertical motor-driven jack 3 is consolidated with bottom plate 2
Connect, and vertical motor-driven jack 3 arranges vertical measurement apparatus 4；The size of the backing plate 5 is 60mm × 60mm × 10mm；Composition
The size of each piece of plate body of force transmitting board 11 is 400mm × 80mm × 10mm；The backing plate 5 of side and biography around described
Power plate 11 is made by the carbon fibre material by that can be penetrated by X-ray；The backing plate 5 of the upper and lower sides and vertical cushion block 7 are equal
It is made up of steel；
The CT scan device of real time scan under true triaxial state, CT scan device can be carried out to the rock sample in pressure cell 6
CT radioactive sources 17 and CT detectors 18 including being correspondingly arranged at pressure cell both sides.
It is below the embodiment of the present invention：
Step one：Bottom plate 2 is fixed on base 1 first, by metal sleeve 16 in four end sleeves of carbon fiber column 9,
And bonded with epoxy resin structural adhesive 21, to strengthen the end resistance to compression of column 9 and shear behavior, metal sleeve 16 is separately fixed at bottom
On plate 2 and top plate 8, vertical cushion block 7 is weldingly fixed on the bottom surface of top plate 8；Wherein bottom plate 2, top plate 8 and vertical cushion block 7 are used
Q460 high-strength steels, four root posts 9 use the carbon fiber of high-tensile（T800）Material；
Step 2：Vertical motor-driven jack 3 is fixed on a base plate 2, vertical measurement apparatus 4 is fixed on vertical electronic very heavy
On top 3；
Step 3：The horizontal counter force wall 10 in wherein side around is respectively welded and is fixed on top plate 8, bottom plate 2
On, the horizontal counter force wall 10 of opposite side is set to slide block structure, is slidably connected with top plate 8, bottom plate 2；By force transmitting board 11 and horizontal stroke
Fixed to counter force wall 10 or sliding block, transverse electric jack 13 is connected with sliding block respectively, and ensure transverse electric jack 13
Beyond scanning area in CT scan device；Cross measure device 14 is fixed with transverse electric jack 13, sliding block respectively,
Transverse electric jack 13 is connected with synchronous Loading Control System 15, the rotating speed of transverse electric jack 13 can be automatically adjusted
Enter momentum so as to change its displacement, it is ensured that movable force transmitting board 11 is in vertical state all the time, makes side force suffered by rock uniform
Distribution；
Step 4：By between six pieces of carbon fiber boards by mutually detaining mode decomposition pressure box 6（Such as Fig. 4）, rock is placed it
In, plate smears lubricant 19 to reduce rubbing between plate and stone, plate and plate with stone contact surface, two plate joining places being connected
Wipe, whole pressure cell 6 is put into true triaxial device, put between 6 six faces of pressure cell and top to bottom, left and right, front and rear loading system
Carbon fiber backing plate 5 is put, to reach intermal force；
In step 2, simultaneously vertical motor-driven jack 3 can be set to replace vertical cushion block 7 on top plate 8；
In step three and four, horizontal counter force wall 10 can be disposed as slide block structure, then the upper and lower side of force transmitting board 11
Transverse electric jack 13 and cross measure device 14 are respectively provided with, pressure cell 6 can be pressed simultaneously by the jack of both sides,
The distance between relative two force transmitting boards 11 of convenient regulation, meet the placement of various sizes of pressure cell 6 simultaneously；
Step 5：Whole true triaxial device is placed between CT experiment machine radioactive sources 17 and detector 18, experiment is completed
Prepare；
Step 6：1. by left and right, front and rear transverse electric jack 13, vertical motor-driven jack 3 is pressurized to 50kN respectively；
Synchronous Loading Control System 15 can automatically adjust the rotating speed of transverse electric jack 13 to change it in whole experiment process
Momentum is entered in displacement, it is ensured that movable carbon fiber force transmitting board 11 is in vertical state all the time, is uniformly distributed side force suffered by rock；
Period cross measure device 14, vertical measurement apparatus 4 record the change in displacement of three loading directions respectively（Following steps are homogeneous
Cause）；2. by setting front and rear transverse electric jack 13, front and rear on-load pressure value is made to keep 50kN constant, left and right is laterally electric
Dynamic jack 13, vertical motor-driven jack 3 is pressurized to 100kN respectively；3. by setting left and right, front and rear transverse electric jack
13, make left and right, front and rear on-load pressure value keep 100kN constant, vertical motor-driven jack 3, every grade are set by graded loading way
Keep vertical on-load pressure value constant automatically after increasing 5kN, every grade of stabilization, and carry out CT scan, afterwards vertical motor-driven jack 3
Start next stage supercharging, and carry out CT scan, repeat until the rock failure mechanism of rock.
Claims (7)
1. a kind of rock true triaxial test system of band CT real time scan systems, it is characterised in that true three including containing rock sample
Axle pressure cell, carries the true triaxial main machine frame of true triaxial pressure cell, around and up and down on three axial directions to rock sample
Stressed loading device is applied, and the CT scan dress of real time scan under true triaxial state can be carried out to the rock sample in pressure cell
Put, CT scan device includes the CT radioactive sources and CT detectors for being correspondingly arranged at pressure cell both sides；The true triaxial main machine frame bag
Include bottom plate, top plate and the column being supported between bottom plate and top plate；The loading device includes anti-outside pressure cell
Power apparatus, and the jack pressed by counterforce device to pressure cell and the measurement of detection jack force size and displacement are filled
Put；The pressure cell, column, and counterforce device in CT scan device scanning area by X-ray by can be penetrated
Carbon fibre material be made；Counterforce device around on two lateral shafts includes two relative force transmitting boards respectively,
Backing plate between force transmitting board and pressure cell, and for the upper and lower end of force transmitting board to be connected with true triaxial main machine frame
Horizontal counter force wall；Wherein, at least side force transmitting board is movable force transmitting board, and the horizontal counter force wall of movable force transmitting board connection is sliding block knot
Structure, is connected with true triaxial main machine frame sliding fit, and the outside upper and lower end of movable force transmitting board, which is symmetrical arranged, can keep synchronous loading
Transverse electric jack, transverse electric jack is provided with cross measure device, and transverse electric jack and true triaxial main frame
Framework is connected；The horizontal counter force wall is set to two sections, and its distance is not less than the height of pressure cell, respectively with true triaxial main frame
Top plate and the bottom plate connection of framework；Connecting hole is correspondingly provided with the horizontal counter force wall and force transmitting board, and is passed through by connector
Connecting hole connects both；The middle inside of the force transmitting board is the arc of evagination, and the carbon fiber backing plate being in contact with it uses arc
Shape sunk structure, fits like a glove therebetween, and is bonded by epoxy resin structural adhesive；The force transmitting board is by how block-shaped, big
Small identical plate body, which is brought into close contact, to be formed, and is fixed between plate body by displacement constraint device；The transverse electric jack connection
There is synchronous Loading Control System；Force transmitting board and cushion block in CT scan device scanning area are made up of carbon fibre material.
2. a kind of rock true triaxial test system of band CT real time scan systems according to claim 1, it is characterised in that
The displacement constraint device is the connecting rod for being arranged on the cranse at force transmitting board two ends or being horizontally through multilayer plate body, connecting rod two ends
Fastened by nut；Bonded between each plate body of the force transmitting board by epoxy resin structural adhesive；Constitute each block of plate of force transmitting board
The size of body is 400mm × 80mm × 10mm.
3. a kind of rock true triaxial test system of band CT real time scan systems according to claim 1, it is characterised in that
Counterforce device on longitudinal axis includes the backing plate positioned at the upper and lower side of pressure cell, and between top backing plate and top plate
Vertical cushion block；Vertical motor-driven jack is set between bottom backing plate and bottom plate, and vertical motor-driven jack is connected with bottom plate, and perpendicular
Vertical measurement apparatus is arranged to motor-driven jack.
4. a kind of rock true triaxial test system of band CT real time scan systems according to claim 3, it is characterised in that
Bottom plate, top plate, upper lower bolster and vertical cushion block beyond the scanning area of CT scan device are made using steel,
And make modifier treatment.
5. a kind of rock true triaxial test system of band CT real time scan systems according to claim 1 or 3, its feature exists
In the size of the backing plate is 60mm × 60mm × 10mm.
6. a kind of rock true triaxial test system of band CT real time scan systems according to claim 1, it is characterised in that
The pressure cell is made up of six pieces of carbon fiber boards by way of mutually buckleing, and rock is placed in pressure cell and connected with inboard wall of cartridge
Touch, lubricant is smeared between the joining place and box body and rock between plate and plate；The chi of six pieces of plate bodys in decomposition pressure box
Very little is 120mm × 120mm × 10mm；The measurement apparatus is made up of pressure sensor and displacement transducer；The column two ends
Wrapped up, bonded using epoxy resin structural adhesive therebetween, high tensile metal sleeve penetrates bottom plate or top with high tensile metal sleeve
Plate is simultaneously welded with bottom plate and top plate respectively, and column top uses wedge-type shape；The column diameter of section is 40mm.
7. a kind of rock true triaxial test method of band CT real time scan systems, comprises the following steps：
1）By left and right, front and rear transverse electric jack, vertical motor-driven jack is pressurized to 50kN respectively；
2）Transverse electric jack before and after by setting, makes front and rear on-load pressure value keep 50kN constant, by left and right transverse electric
Jack, vertical motor-driven jack is pressurized to 100kN respectively；
3）By set left and right, front and rear transverse electric jack, make left and right, front and rear on-load pressure value keep 100kN it is constant, by point
Level load mode keeps vertical on-load pressure value not automatically after setting vertical motor-driven jack, every grade of increase 5kN, every grade of stabilization
Become, and carry out CT scan, vertical motor-driven jack starts next stage supercharging afterwards, and carries out CT scan, repeats until rock
Stone is destroyed, and CT scan device obtains the image of whole process of the test；
Synchronous Loading Control System automatically adjusts the rotating speed of transverse electric jack to change its displacement in whole experiment process
Enter momentum, it is ensured that movable carbon fiber force transmitting board is in vertical state all the time, is uniformly distributed side force suffered by rock；Period is horizontal
Record the change in displacement of three loading directions respectively to measurement apparatus, vertical measurement apparatus.
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