CN105181471A - Rock true triaxial test system with CT (Computed Tomography) real-time scanning system and method - Google Patents
Rock true triaxial test system with CT (Computed Tomography) real-time scanning system and method Download PDFInfo
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- CN105181471A CN105181471A CN201510577392.2A CN201510577392A CN105181471A CN 105181471 A CN105181471 A CN 105181471A CN 201510577392 A CN201510577392 A CN 201510577392A CN 105181471 A CN105181471 A CN 105181471A
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Abstract
The invention relates to a rock true triaxial test system with a CT (Computed Tomography) real-time scanning system and a method. The rock true triaxial test system with the CT real-time scanning system comprises a triaxial pressure box, a triaxial host frame, a loading device and a CT scanning device, wherein the triaxial host frame comprises a bottom plate, a top plate and a stand column supported on the bottom plate; the loading device comprises a reversed force device, a jack and a measuring device; the pressure box, the stand column, and the reversed force device located in a scanning area of the CT scanning device are respectively made of carbon fiber materials. The rock true triaxial test system adopts the horizontal loading device, a carbon fiber force transfer plate and the stand column with special designs for a CT scanning area; solves the difficult problem that an X ray cannot penetrate through a traditional triaxial tester; overcomes the defect that in the traditional test, a rock sample needs to be unloaded and taken down from a true triaxial test bed and is then tested through CT scanning; realizes real-time coordination of rock true triaxial and CT scanning test; has significance on researching real-time extension and evolution law of microfissuring and microvoid in rocks under the triaxial stress state.
Description
Technical field
The invention belongs to rock mechanics and rock test field, be specifically related to a kind of rock true triaxial test system with CT real time scan system and method.
Background technology
The real triaxial stress state of True Triaxial Apparatus energy model engineering rock mass, analyze the Strength and Dformation characteristic of rock in three different principle stress situations, on each of rock sample, principle stress can be applied independently by certain change during true triaxial test, and measure corresponding principal strain, realize the stress loading path of various complexity, so more adding system, comprehensively, in depth disclose the deformation-failure character of rock.
The destruction of rock mass, normally due to the microfissure of inside and Micro-v oid crack initiation, development be finally mutually formed through that macroscopic cracking causes.Therefore, the microfissure in research rock mass and the expansion of Micro-v oid, Evolution, understand fully the mechanism of rock mass failure instability, significant for rock engineering and the analysis of rock body quality of mine engineering stability etc.Use CT scan technology, comprehensive monitoring can be carried out to the structure change of rock sample inside, understand the localized variation of rock sample inner structure, slight change and variation tendency, grasp the proterties of rock sample under different stress condition.
Use actual triaxial testing apparatus and coordinate CT real time scan, the Strength and Dformation characteristic of rock under real triaxial stress state can be studied, and according to the image feature of CT image, analyze rock mesostructure and change procedure thereof, explain the mechanism of macro strength change and distortion, disclose rock interior fracture breaks Evolution, for the microexamination of rock and engineering Application Research provide reliable scientific basis.
Related with the present patent application have:
1. a kind of rock true triaxial test loading system disclosed in Chinese patent CN201410089591.4, comprise base, described base is connected with many pull bar bottoms, structure is simple, and easily operate, floor area is little, can realize single shaft, twin shaft, three axle load tests, and test error is little.
2. relate to a kind of high crustal stress genuine three-dimensional load model trial system disclosed in Chinese patent CN200810016641.0, there is synchronous, independence, high-ground stress loading, load automaticity and loading accuracy high, value-added tax function is many, realize axial loading the in cavern to punch, the advantages such as loading system rigidity is high, resistance to overturning good, simple to operation.
Above-mentioned two patents relate generally to rock macroscopic failure under research true triaxial condition, because experimental provision general frame, rock 6 face load plate adopt metal material, the ray that CT machine sends can not be through, cannot realize the real-time CT scan under rock true triaxial loading environment.For the evolution law of cracks of rock interior under understanding true triaxial condition, traditional way is that rock sample is carried out CT scan test after true triaxial bracket loading test platform takes off, but the accuracy that the method has a certain amount of springback influence to test after rock sample load is laid down.
3. the microcomputer controlled electro-hydraulic servo multi-scenarios method rock triaxial test machine of Chinese patent CN201320462332.2 disclosed band CT scan imaging system.Comprise testing machine main frame, Based on Electro-hydraulic Loading Servo System, confined pressure hole pressure servo loading system, closed loop measurement and control system, computing machine control and disposal system, CT scan system, temperature control system and rotatable platform etc.This system architecture is simple, and measurement data is accurate and easy to operate, effectively the physics characteristic of reflection rock under axis and confined pressure effect.
4. a kind of pressure chamber for CT triaxial test disclosed in Chinese patent CN201310471580.8, observes for coordinating Micro-focusCT and the thin sight of mechanics Penetration Signature under normal triaxial pressure of research sample is developed.
Although the experimental system involved by above-mentioned two kinds of patents can realize the CT real time scan that rock sample loads, but the mainly normal triaxial related to (i.e. false three axles,) test unit, the fundamental drawback of ordinary triaxial test device is to test the Strength and Dformation rule that rock sample is under axisymmetric stress state (), the general stress state (i.e. true triaxial) suffered by rock reality can not be represented.Therefore, need to design a kind of rock actual triaxial testing apparatus that can coordinate CT real time scan.
Summary of the invention
In order to realize carrying out true triaxial loading to rock in CT Real-Time Monitoring situation, the present invention designs a kind of rock true triaxial test system with CT real time scan system and method, carrys out study of rocks failure evolvement rule under true triaxial stress state.
For achieving the above object, its technical scheme is as follows: a kind of rock true triaxial test system with CT real time scan system, comprise the true triaxial pressure cell of splendid attire rock sample, the true triaxial main machine frame of carrying true triaxial pressure cell, axially stressed charger is executed to rock sample all around and upper and lower three, and the CT scan device of real time scan under true triaxial state can be carried out to the rock sample in pressure cell, CT scan device comprises CT radioactive source and the CT detector that correspondence is located at pressure cell both sides; The column that described true triaxial main machine frame comprises base plate, top board and is supported between base plate and top board; Described charger comprises the counterforce device being positioned at pressure cell outside, and by counterforce device to the pressure cell lifting jack of exerting pressure and the measurement mechanism detecting lifting jack force size and displacement; Described pressure cell, column, and the counterforce device being positioned at CT scan device scanning area is by can being made by the carbon fibre material that X ray penetrates.
The counterforce device be positioned on the lateral shaft of two, all around comprises two relative force transmitting boards respectively, the backing plate between force transmitting board and pressure cell, and the horizontal counter force wall for being connected with true triaxial main machine frame by the upper and lower end of force transmitting board; Wherein, at least side force transmitting board is movable force transmitting board, the horizontal counter force wall that movable force transmitting board connects is slide block structure, be connected with true triaxial main machine frame sliding fit, the outside upper and lower end of movable force transmitting board is symmetrical arranged and can keeps the synchronous transverse electric lifting jack loaded, transverse electric lifting jack is provided with cross measure device, and transverse electric lifting jack and true triaxial main machine frame are connected.
Described horizontal counter force wall is set to two sections, and its distance is not less than the height of pressure cell, is connected respectively with the top board of true triaxial main machine frame and base plate.
On described horizontal counter force wall and force transmitting board, correspondence is provided with connecting hole, and both is connected through connecting hole by web member.
The middle inside of described force transmitting board is the arc of evagination, and the carbon fiber backing plate be in contact with it adopts arc-shaped recess structure, fits like a glove therebetween, and is bondd by epoxy resin structural adhesive.
Described force transmitting board is fitted tightly by polylith shape, plate body that size is identical and forms, and is fixed between plate body by displacement constraint device.
Described displacement constraint device is be arranged on the cranse at force transmitting board two ends or be horizontally through the connecting link of multilayer plate body, and fastening nuts is passed through at connecting link two ends.
Bondd by epoxy resin structural adhesive between each plate body of described force transmitting board.
Each piece of plate body of described composition force transmitting board is of a size of 400mm × 80mm × 10mm.
Described transverse electric lifting jack is connected with synchronous Loading Control System.
The force transmitting board and the cushion block that are positioned at CT scan device scanning area are made up of carbon fibre material.
The counterforce device be positioned on longitudinal axis comprises the backing plate being positioned at the upper and lower side of pressure cell, and the vertical cushion block between top backing plate and top board; Arrange vertical motor-driven jack between bottom backing plate and base plate, vertical motor-driven jack and base plate are connected, and vertical motor-driven jack arranges vertical measurement mechanism.
Base plate beyond the scanning area being positioned at CT scan device, top board, upper lower bolster and vertical cushion block all adopt steel to be made, and do modifier treatment.
Described backing plate is of a size of 60mm × 60mm × 10mm.
Described pressure cell consists of the mode of buckleing mutually six pieces of carbon fiber boards, and rock to be placed in pressure cell and to contact with inboard wall of cartridge, the joining place between plate and plate and smear lubricant between box body and rock.
Six pieces of plate bodys in described decomposition pressure box are of a size of 120mm × 120mm × 10mm.
Described measurement mechanism is made up of pressure transducer and displacement transducer.
Described column two ends all with high tensile metal sleeve parcel, use epoxy resin structural adhesive bonding therebetween, and high tensile metal sleeve penetrates base plate or top board also welds with base plate and top board respectively, and column top adopts wedge-type shape.
Described column diameter of section is 40mm.
With a rock true triaxial test method for CT real time scan system, comprise the following steps:
1) by left and right, front and back transverse electric lifting jack, vertical motor-driven jack is pressurized to 50kN respectively;
2) by arranging front and back transverse electric lifting jack, make front and back on-load pressure value keep 50kN constant, by left and right transverse electric lifting jack, vertical motor-driven jack is pressurized to 100kN respectively;
3) by arranging left and right, front and back transverse electric lifting jack, make left and right, 100kN is constant for the maintenance of front and back on-load pressure value, by graded loading way, vertical motor-driven jack is set, every grade increases 5kN, and every grade of vertical on-load pressure value of stable rear maintenance is automatically constant, and carries out CT scan, vertical motor-driven jack starts next stage supercharging afterwards, and carry out CT scan, repetitive operation is until the rock failure mechanism of rock, and CT scan device obtains the image of whole process of the test;
In whole experimentation, synchronous Loading Control System automatically regulates the rotating speed of transverse electric lifting jack thus changes its displacement precession amount, ensures that movable carbon fiber force transmitting board is in vertical state all the time, side force suffered by rock is uniformly distributed; Period cross measure device, vertical measurement mechanism record the change in displacement of three loading directions respectively.
Good effect of the present invention: the present invention adopts the horizontal loading system of particular design, carbon fiber force transmitting board and carbon fiber column to CT scan district, solve the difficult problem that X ray cannot penetrate traditional true triaxial test machine, overcome in traditional experiment and need rock sample to carry out the drawback of CT scan test after the unloading of true triaxial test platform is taken off, achieve real-time that rock true triaxial and CT scan test to coordinate, the real-time extension of the microfissure in rock under research true triaxial stress state and Micro-v oid, Evolution are had great importance.
Accompanying drawing explanation
Fig. 1 is general assembly structural representation of the present invention.
Fig. 2 is that the present invention removes top board inner 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 that carbon fiber force transmitting board of the present invention is mounted with schematic diagram.
Fig. 6 is mutual button mode schematic diagram between the present invention's six pieces of carbon fiber boards.
In figure, 1-base; 2-base plate; The vertical motor-driven jack of 3-; The vertical measurement mechanism of 4-; 5-backing plate; 6. pressure cell; The vertical cushion block of 7-; 8-top board; 9-column; The horizontal counter force wall of 10-; 11-force transmitting board; 12-slide block; 13-transverse electric lifting jack; 14-cross measure device; The synchronous Loading Control System of 15-; 16-metal sleeve; 17-CT radioactive source 17; 18-CT detector; 19-lubricant; 20-displacement constraint device, 21. epoxy resin structural adhesives.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of rock true triaxial test system with CT real time scan system, comprise the true triaxial pressure cell 6 of splendid attire rock sample, described pressure cell 6 consists of the mode of buckleing mutually six pieces of carbon fiber boards, rock to be placed in pressure cell 6 and to contact with inboard wall of cartridge, the joining place between plate and plate and smear lubricant 19 between box body and rock; In decomposition pressure box, six pieces of plate bodys of 6 are of a size of 120mm × 120mm × 10mm;
The true triaxial main machine frame of carrying true triaxial pressure cell 6, the column 9 that described true triaxial main machine frame comprises base plate 2, top board 8 and is supported between base plate 2 and top board 8, base plate 2 is arranged on base 1; Column 9 adopts high-tensile carbon fiber (T800) material to make, and its diameter of section is 40mm; Consider that carbon fiber column 9 is for anisotropic material, Transverse Shear Strength is lower, easily occur that pressure cuts breakoff phenomenon in its end, column 9 two ends are all wrapped up with high tensile metal sleeve 16, therebetween epoxy resin structural adhesive 21 is used to bond, high tensile metal sleeve 16 penetrates base plate 2 or top board 8 also welds with base plate 2 and top board 8 respectively, and column 9 top adopts wedge-type shape, enhances post end resistance to compression and shear behavior; Described base plate 2 and top board 8 adopt Q460 high-strength steel to make;
In three axial directions stressed charger is executed to rock sample, described charger comprises the counterforce device being positioned at pressure cell 6 outside, and by counterforce device to pressure cell 6 lifting jack of exerting pressure and the measurement mechanism detecting lifting jack force size and displacement, described measurement mechanism comprises cross measure device 14 and vertical measurement mechanism 4, and measurement mechanism forms by pressure transducer, displacement transducer and data acquisition system (DAS), the counterforce device be positioned on the lateral shaft of two, all around comprises two relative force transmitting boards 11 respectively, backing plate 5 between force transmitting board 11 and pressure cell 6, and the horizontal counter force wall 10 for the upper and lower end of force transmitting board 11 is connected with true triaxial main machine frame, described horizontal counter force wall 10 is set to two sections, is connected respectively with the top board 8 of true triaxial main machine frame and base plate 2, upper, lower horizontal is positioned at the upper and lower sides of pressure cell 6 to counter force wall 10, and the distance between upper and lower counter force wall is not less than the height of pressure cell 6, on horizontal counter force wall 10 and force transmitting board 11, correspondence is provided with connecting hole, and both is connected through connecting hole by web member, wherein, at least side force transmitting board 11 is movable force transmitting board 11, the horizontal counter force wall 10 that movable force transmitting board 11 connects is slide block 12 structure, be connected with true triaxial main machine frame sliding fit, the outside upper and lower end of movable force transmitting board 11 is symmetrical arranged and can keeps the synchronous transverse electric lifting jack 13 loaded, transverse electric lifting jack 13 is provided with cross measure device 14, and transverse electric lifting jack 13 and true triaxial main machine frame are connected, described transverse electric lifting jack 13 is connected with synchronous Loading Control System 15, on synchronous Loading Control System 15 receives, the displacement data that lower horizontal measurement mechanism 14 gathers, on monitoring, when the displacement of lower two transverse electric lifting jack 13 is inconsistent, synchronous Loading Control System 15 reduces the rotating speed of the transverse electric lifting jack 13 of the larger one end of displacement automatically, its displacement output quantity speedup is reduced, increase transverse electric lifting jack 13 rotating speed of the less one end of displacement simultaneously, its displacement output quantity speedup is improved, the two is made to reach balance fast by this adjustment, in whole horizontal loading procedure, make, lower two transverse electric lifting jack 13 keep synchronous, ensure that carbon fiber force transmitting board 11 is in vertical state all the time, thus the pressure uniform making carbon fiber force transmitting board 11 act on true triaxial pressure cell 6 distributes, the middle inside of described force transmitting board 11 is the arc of evagination, and improve the bending resistance of carbon fiber force transmitting board 11, the carbon fiber backing plate 5 be in contact with it adopts arc-shaped recess structure, fits like a glove therebetween, and is bondd by epoxy resin structural adhesive 21, described force transmitting board 11 is closely combined by polylith shape, plate body that size is identical and forms, and is fixed between plate body by displacement constraint device 20, described displacement constraint device 20 is for being arranged on the cranse at force transmitting board 11 two ends or being horizontally through the connecting link of multilayer plate body, and fastening nuts is passed through at connecting link two ends, in order to increase the intensity of force transmitting board 11, bondd by epoxy resin structural adhesive between each plate body of described force transmitting board 11, the counterforce device be positioned on longitudinal axis comprises the backing plate 5 being positioned at the upper and lower side of pressure cell 6, and the vertical cushion block 7 between top backing plate 5 and top board 8, arrange vertical motor-driven jack 3 between bottom backing plate 5 and base plate 2, vertical motor-driven jack 3 is connected with base plate 2, and vertical motor-driven jack 3 arranges vertical measurement mechanism 4, described backing plate 5 is of a size of 60mm × 60mm × 10mm, each piece of plate body of composition force transmitting board 11 is of a size of 400mm × 80mm × 10mm, the backing plate 5 of side, described all around and force transmitting board 11 are by by can being made by the carbon fibre material that X ray penetrates, backing plate 5 and the vertical cushion block 7 of described upper and lower sides are made by steel,
Can carry out the CT scan device of real time scan under true triaxial state to the rock sample in pressure cell 6, CT scan device comprises CT radioactive source 17 and the CT detector 18 that correspondence is located at pressure cell both sides.
Be the specific embodiment of the present invention below:
Step one: first base plate 2 is fixed on base 1, by metal sleeve 16 in four carbon fiber column 9 end sleeve, and bond with epoxy resin structural adhesive 21, to strengthen column 9 end resistance to compression and shear behavior, metal sleeve 16 is separately fixed on base plate 2 and top board 8, and vertical cushion block 7 is weldingly fixed on top board 8 bottom surface; Wherein base plate 2, top board 8 and vertical cushion block 7 all adopt Q460 high-strength steel, and four root posts 9 adopt high-tensile carbon fiber (T800) material;
Step 2: by fixing on a base plate 2 for vertical motor-driven jack 3, vertical measurement mechanism 4 is fixed on vertical motor-driven jack 3;
Step 3: be weldingly fixed on top board 8, base plate 2 respectively by horizontal for the wherein side being positioned at all around counter force wall 10, the horizontal counter force wall 10 of opposite side is set to slide block 12 structure, with top board 8, base plate 2 sliding connection; Force transmitting board 11 and horizontal counter force wall 10 or slide block 12 are fixed, transverse electric lifting jack 13 is connected with slide block 12 respectively, and ensures that transverse electric lifting jack 13 is in beyond the scanning area of CT scan device; Cross measure device 14 is fixed with transverse electric lifting jack 13, slide block 12 respectively, transverse electric lifting jack 13 is connected with synchronous Loading Control System 15, can automatically regulate the rotating speed of transverse electric lifting jack 13 thus change its displacement precession amount, ensure that movable force transmitting board 11 is in vertical state all the time, side force suffered by rock is uniformly distributed;
Step 4: by between six pieces of carbon fiber boards by mutual button mode decomposition pressure box 6(as Fig. 4), rock is placed wherein, plate and stone surface of contact, the two plate joining places be connected smear lubricant 19 to reduce plate and stone, friction between plate and plate, whole pressure cell 6 is put into true triaxial device, carbon fiber backing plate 5 is placed, to reach intermal force between pressure cell 6 six faces and top to bottom, left and right, front and rear loading system;
In step 2, simultaneously vertical motor-driven jack 3 can be set on top board 8 and replace vertical cushion block 7;
In step 3 and four, horizontal counter force wall 10 all can be set to slide block 12 structure, then the upper and lower side of force transmitting board 11 all arranges transverse electric lifting jack 13 and cross measure device 14, can be exerted pressure to pressure cell 6 by the lifting jack of both sides simultaneously, the convenient distance regulated between relative two force transmitting boards 11, meets the placement of the pressure cell 6 of different size simultaneously;
Step 5: whole true triaxial device is placed between CT testing machine radioactive source 17 and detector 18, completes Preparatory work of experiment;
Step 6:
by left and right, front and back transverse electric lifting jack 13, vertical motor-driven jack 3 is pressurized to 50kN respectively; In whole experimentation, synchronous Loading Control System 15 can automatically regulate the rotating speed of transverse electric lifting jack 13 thus change its displacement precession amount, ensures that movable carbon fiber force transmitting board 11 is in vertical state all the time, side force suffered by rock is uniformly distributed; Period cross measure device 14, vertical measurement mechanism 4 record the change in displacement (following steps are all consistent) of three loading directions respectively;
by arranging front and back transverse electric lifting jack 13, make front and back on-load pressure value keep 50kN constant, by left and right transverse electric lifting jack 13, vertical motor-driven jack 3 is pressurized to 100kN respectively;
by arranging left and right, front and back transverse electric lifting jack 13, make left and right, 100kN is constant for the maintenance of front and back on-load pressure value, by graded loading way, vertical motor-driven jack 3 is set, every grade increases 5kN, every grade of vertical on-load pressure value of stable rear maintenance is automatically constant, and carries out CT scan, and vertical motor-driven jack 3 starts next stage supercharging afterwards, and carry out CT scan, repetitive operation is until the rock failure mechanism of rock.
Claims (9)
1. the rock true triaxial test system with CT real time scan system, it is characterized in that, comprise the true triaxial pressure cell of splendid attire rock sample, the true triaxial main machine frame of carrying true triaxial pressure cell, axially stressed charger is executed to rock sample all around and upper and lower three, and the CT scan device of real time scan under true triaxial state can be carried out to the rock sample in pressure cell, CT scan device comprises CT radioactive source and the CT detector that correspondence is located at pressure cell both sides; The column that described true triaxial main machine frame comprises base plate, top board and is supported between base plate and top board; Described charger comprises the counterforce device being positioned at pressure cell outside, and by counterforce device to the pressure cell lifting jack of exerting pressure and the measurement mechanism detecting lifting jack force size and displacement; Described pressure cell, column, and the counterforce device being positioned at CT scan device scanning area is by can being made by the carbon fibre material that X ray penetrates.
2. a kind of rock true triaxial test system with CT real time scan system according to claim 1, it is characterized in that, the counterforce device be positioned on the lateral shaft of two, all around comprises two relative force transmitting boards respectively, backing plate between force transmitting board and pressure cell, and the horizontal counter force wall for the upper and lower end of force transmitting board is connected with true triaxial main machine frame; Wherein, at least side force transmitting board is movable force transmitting board, the horizontal counter force wall that movable force transmitting board connects is slide block structure, be connected with true triaxial main machine frame sliding fit, the outside upper and lower end of movable force transmitting board is symmetrical arranged and can keeps the synchronous transverse electric lifting jack loaded, transverse electric lifting jack is provided with cross measure device, and transverse electric lifting jack and true triaxial main machine frame are connected.
3. a kind of rock true triaxial test system with CT real time scan system according to claim 2, it is characterized in that, described horizontal counter force wall is set to two sections, and its distance is not less than the height of pressure cell, is connected respectively with the top board of true triaxial main machine frame and base plate; On described horizontal counter force wall and force transmitting board, correspondence is provided with connecting hole, and both is connected through connecting hole by web member; The middle inside of described force transmitting board is the arc of evagination, and the carbon fiber backing plate be in contact with it adopts arc-shaped recess structure, fits like a glove therebetween, and is bondd by epoxy resin structural adhesive; Described force transmitting board is fitted tightly by polylith shape, plate body that size is identical and forms, and is fixed between plate body by displacement constraint device; Described transverse electric lifting jack is connected with synchronous Loading Control System; The force transmitting board and the cushion block that are positioned at CT scan device scanning area are made up of carbon fibre material.
4. a kind of rock true triaxial test system with CT real time scan system according to claim 3, it is characterized in that, described displacement constraint device is be arranged on the cranse at force transmitting board two ends or be horizontally through the connecting link of multilayer plate body, and fastening nuts is passed through at connecting link two ends; Bondd by epoxy resin structural adhesive between each plate body of described force transmitting board; Each piece of plate body of described composition force transmitting board is of a size of 400mm × 80mm × 10mm.
5. a kind of rock true triaxial test system with CT real time scan system according to claim 1, it is characterized in that, the counterforce device be positioned on longitudinal axis comprises the backing plate being positioned at the upper and lower side of pressure cell, and the vertical cushion block between top backing plate and top board; Arrange vertical motor-driven jack between bottom backing plate and base plate, vertical motor-driven jack and base plate are connected, and vertical motor-driven jack arranges vertical measurement mechanism.
6. a kind of rock true triaxial test system with CT real time scan system according to claim 5, it is characterized in that, base plate beyond the scanning area being positioned at CT scan device, top board, upper lower bolster and vertical cushion block all adopt steel to be made, and do modifier treatment.
7. a kind of rock true triaxial test system with CT real time scan system according to claim 2 or 5, it is characterized in that, described backing plate is of a size of 60mm × 60mm × 10mm.
8. a kind of rock true triaxial test system with CT real time scan system according to claim 1, it is characterized in that, described pressure cell consists of the mode of buckleing mutually six pieces of carbon fiber boards, rock to be placed in pressure cell and to contact with inboard wall of cartridge, the joining place between plate and plate and smear lubricant between box body and rock; Six pieces of plate bodys in described decomposition pressure box are of a size of 120mm × 120mm × 10mm; Described measurement mechanism is made up of pressure transducer and displacement transducer; Described column two ends all with high tensile metal sleeve parcel, use epoxy resin structural adhesive bonding therebetween, and high tensile metal sleeve penetrates base plate or top board also welds with base plate and top board respectively, and column top adopts wedge-type shape; Described column diameter of section is 40mm.
9. the rock true triaxial test method with CT real time scan system, comprises the following steps:
1) by left and right, front and back transverse electric lifting jack, vertical motor-driven jack is pressurized to 50kN respectively;
2) by arranging front and back transverse electric lifting jack, make front and back on-load pressure value keep 50kN constant, by left and right transverse electric lifting jack, vertical motor-driven jack is pressurized to 100kN respectively;
3) by arranging left and right, front and back transverse electric lifting jack, make left and right, 100kN is constant for the maintenance of front and back on-load pressure value, by graded loading way, vertical motor-driven jack is set, every grade increases 5kN, and every grade of vertical on-load pressure value of stable rear maintenance is automatically constant, and carries out CT scan, vertical motor-driven jack starts next stage supercharging afterwards, and carry out CT scan, repetitive operation is until the rock failure mechanism of rock, and CT scan device obtains the image of whole process of the test;
In whole experimentation, synchronous Loading Control System automatically regulates the rotating speed of transverse electric lifting jack thus changes its displacement precession amount, ensures that movable carbon fiber force transmitting board is in vertical state all the time, side force suffered by rock is uniformly distributed; Period cross measure device, vertical measurement mechanism record the change in displacement of three loading directions respectively.
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