CN106053238A - Unilateral unloading test device for brittle rock in biaxial stress state and test method of unilateral unloading test device - Google Patents
Unilateral unloading test device for brittle rock in biaxial stress state and test method of unilateral unloading test device Download PDFInfo
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- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
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- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 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
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N3/02—Details
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- G—PHYSICS
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- 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
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
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- 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
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- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0064—Initiation of crack
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- 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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
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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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
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- 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
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- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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Abstract
The invention discloses a unilateral unloading test device for brittle rock in a biaxial stress state and a test method of the unilateral unloading test device. The device comprises a two-axis servo control real-time loading and unloading system, a stress-strain monitoring system, an automatic control and data acquisition system, an acoustic emission monitoring system and a portable image acquisition and analysis system, wherein a confining pressure state in a stratum under certain conditions as well as a unilateral excavation unloading operating condition of an underground cavern in a construction process can be simulated; the overall stress-strain level of a rock sample is recorded by the stress-strain monitoring system; a local unilateral unloading rate is controlled and fed back by the automatic control and data acquisition system; the acoustic emission monitoring system and the portable image acquisition and analysis system monitor crack initiation, expansion, opening and closing features of cracks in a unilateral unloading region and an influence domain of the unilateral unloading region in the whole process and observe and analyze a formation and expansion mechanism of the cracks, and theoretical basis and experimental basis are provided for research of cavern side wall splitting failure caused by excavation unloading.
Description
Technical field
The present invention relates to monolateral unloading test device and test method thereof under brittle rock mass biaxial stress state.
Background technology
Along with the development & construction in Chinese large-sized water conservancy and hydropower, nuclear power underground engineering and tunnel Yu slope project, real in engineering
The Excavation Problems of substantial amounts of high gradient slope and large underground hole is encountered in trampling.In essence, excavation off-load is i.e. ground
Stress concentrates the process of release, and compared to loading environment, under its state, rock mass mechanics characteristic has significant difference.Particularly with greatly
Area off-load, owing to crustal stress burst size is big, off-load magnitude is high, coverage is wide so that engineering rock mass shows the power of complexity
Learn feature.The universal existence of the rock mass deformation breakoff phenomenon caused in view of Unloading Effect, Rock Mass Unloading mechanical characteristic becomes
Hot issue for Chinese scholars research.
Traditional Experimental Method in Laboratory is typically to become to meet the test specimen of certain standard or based on similarity by natural rock system
Principle sets up respective physical model, and by recording the destruction under the change of ess-strain during the applying of outer lotus and macro-scale
Pattern analyzes the mechanical behavior during its experiment.Later, along with the development of the technology of measurement, again with means such as acoustic emissions to grand
See rupture process to be confirmed.The advantage of said method maximum is the deformation under the effect of balanced load by test specimen or model
Journey describes out quantitatively, and to obtain Mechanics Parameters of Rock Mass and constitutive relation curve, and then it is right to hold research from macro-level
The mechanical characteristic of elephant.
At present, in terms of laboratory test, the research about Rock Mass Unloading mechanical characteristic has launched, but it mostly relies on
Traditional testing equipment and method, i.e. on the basis of Multi-axial Loading assay device, use the side that the rock sample plane of symmetry unloads simultaneously
Method.This kind of process ignores the monolateral Unloading Condition in actual rock excavation engineering, does not consider unloading situation from microscopic parameter
The failure mechanism of lower rock sample, has certain limitation, needs us to develop under a kind of brittle rock mass biaxial stress state monolateral
Unloading test device and test method thereof.
Summary of the invention
The present invention is monolateral unloading test device and test method thereof under brittle rock mass biaxial stress state, it is therefore intended that gram
The shortcomings and deficiencies of clothes tradition rock sample unloading test device.According to the crustal stress states under mineral geology occurrence condition, disclose one
Kind can simulate during Cavity Construction the monolateral macroscopic destruction operating mode in local and disclosure satisfy that by rock caused by monolateral unloading
What the grand thin sight vandalism of body was monitored advanced person, efficient, directly perceived, reliable and safe assay device and test method.
The present invention solves the deficiency of above-mentioned tradition unloading test device by the following technical solutions:
Monolateral unloading test device under brittle rock mass biaxial stress state, controls to add unloading system in real time including two axis servo
System, stress-strain monitoring system, Automated condtrol and data collecting system, acoustic emission monitoring system and portable image capture
And analysis system；Stress-strain monitoring system, Automated condtrol and data collecting system, acoustic emission monitoring system and portable
Image acquisition and analysis system control to add uninstalling system in real time with two axis servo respectively and are connected, and stress-strain monitors system and oneself
Dynamicization controls and data collecting system connects；
Described two axis servo controls to add uninstalling system in real time, is realized rock sample by the coordinated of three tunnel loading systems
The simulation of Biaxial Compression stress state；Two axis servo controls to add uninstalling system in real time and includes the two-way reaction frame of rectangle, two-way counter-force
Top servo-cylinder, right side servo-cylinder and left side servo-cylinder, two-way counter-force it is respectively equipped with on the upper beam of frame, You Liang and left beam
It is coaxial that the underbeam of frame is provided with lower support bar, top servo-cylinder and lower support bar, right side servo-cylinder and left side servo
Oil cylinder is coaxial, and the free end of top servo-cylinder, right side servo-cylinder, left side servo-cylinder and lower support bar is respectively equipped with
Portion's pressure transmission plate, right side pressure transmission plate, left side local pressure transmission plate and bottom bearing plate, local, left side pressure transmission plate is nested in left side bearing plate
Middle part, top pressure transmission plate, right side pressure transmission plate, left side bearing plate and bottom bearing plate surround pressure chamber, and rock sample is sandwiched in pressure
Indoor, realize the monolateral unloading of rock sample by the way of the pressure transmission plate upward pressure of local on the left of constantly reducing；
Described stress-strain monitoring system, for recording the change of rock sample stress, strain regime, and will collect
Data send Automated condtrol and data collecting system to；Stress-strain monitoring system includes the work being located at left side servo-cylinder
The level in stopper rod exit to pressure transducer, be located at lower support bar lower end vertical pressure sensor, be located at left side servo
The local pressure sensor of pressure transmission plate junction, the piston rod of oil cylinder and left side local and be pasted on the foil gauge on rock sample surface；
Described Automated condtrol and data collecting system, added the control program of uninstall process, automatically control by input
Two axis servo controls to add uninstalling system in real time and is further applied load rock sample, and receives the rock sample that stress-strain monitoring system acquisition arrives
Stress, the data of strain regime；
Described acoustic emission monitoring system, for monitoring crack initiation and the extension evolution parameter of rock sample underbead crack；Acoustic emission
Monitoring system is made up of acoustic emission probe and acoustic emission processing means, the top pressure transmission plate around pressure chamber and bottom bearing plate
On be reserved with the layout points of acoustic emission probe, utilize the acoustic emission of acoustic emission probe and acoustic emission processing means monitoring rock sample to become
Change, and carry out three dimensional sound transmitting location；
Described portable image capture and the system of analysis, by contrast rock sample unloading surface, influence area same tag point
Position difference in different time sequence obtains the strain of its real-time whole audience, to analyze the through trend of crackle；Portable image is adopted
Collection and analysis system are made up of image capture device, storage device and image analysis software.
Two axis servo control add in real time uninstalling system maximum stress in horizontally and vertically both direction all up to
200MPa。
Rock sample dimensions is: 150 × 150 × 150mm, and has the alternate paint of black and white in its surface sprinkling.
Described local, left side pressure transmission board size specification is: 70 × 70 × 10mm.
Top pressure transmission plate, right side pressure transmission plate and local, left side pressure transmission plate all use the mode and each piston rod that Universal-head connects
Connect.
The quantity of acoustic emission probe is eight groups, and the mode using tetragon para-position to arrange is arranged.
Image capture device uses two groups of high-speed CCD camera lenses.
Automated condtrol and data collecting system use the Automated condtrol of panel type and data to show.
The test method of monolateral unloading test device under brittle rock mass biaxial stress state, uses as claimed in claim 1
Brittle rock mass biaxial stress state under monolateral unloading test device test, comprise the following steps:
Step one, process of first being sprayed paint in the scope of freedom, rock sample side, paste foil gauge at its opposite side and will draw
Wire is connected with stress-strain monitoring system, and the rock sample after processing is positioned on the bearing plate of bottom to be ajusted, and adjusts level
Axle and reaction frame upper beam, make top pressure transmission plate, right side pressure transmission plate, left side bearing plate and bottom bearing plate be in close contact with rock sample,
Carry out prestrain, detect the running status of each system；
Step 2, applies vertical F to rock sample respectively by top pressure transmission plate, right side pressure transmission plateVAnd level is to load FH, with
Time by left side local pressure transmission plate apply Local Loads, size isFH, so that load is uniformly distributed on the loading surface of left side,
Wherein a is the left side bearing plate length of side, and b is that local, left side pressure transmission edges of boards are long；
Step 3, the two-dimensional state of stress of maintenance rock sample is until stress, strain value are stable, by local pressure transmission on the left of reducing
The load that plate is transmitted reaches the monolateral unloading to rock sample left surface regional area, and the speed of unloading is controlled by two axis servo
Add uninstalling system in real time to be controlled；With acoustic emission probe, acoustic emission processing means and image capture device record uninstall process
The acoustic emission phenomenon of middle rock sample and the extension trend of coverage internal fissure thereof；
Step 4, drills whole stress in uninstall process, strain, crack initiation and the cracks can spread of adding captured in each system
The characteristic information changing parameter is analyzed, and studies the crack initiation of monolateral unloading area and its domain of influence internal fissure and opens closing characteristics,
And the formation in crack and extension mechanism.
The present invention uses above technical scheme compared with prior art, has following technical effect that the present invention can simulate rock
The sample monolateral unloading under the conditions of Multiaxial stress, catches whole stress in uninstall process, strain, crack initiation and the cracks can spread of adding and develops
The characteristic information of parameter, in order to simulation Cavity Construction during local monolateral excavating condition, thus analyze further by
Grand m eso-m echanicalbehavior in Rock Fracture Processes caused by monolateral unloading, the stability study for underground engineering provides theory
Hold.
Accompanying drawing explanation
Fig. 1 be the present invention brittle rock mass biaxial stress state under the structural representation of monolateral unloading test device；
Fig. 2 is that the two axis servo of the present invention controls to add in real time the structural representation of uninstalling system；
Fig. 3 is local, the left side pressure transmission plate structural representation with left side bearing plate of the present invention.
Wherein, 1-two axis servo controls to add uninstalling system in real time；2-stress-strain monitoring system；3-Automated condtrol and
Data collecting system；4-acoustic emission monitoring system；5-portable image capture and the system of analysis；The two-way reaction frame of 6-；7-top
Servo-cylinder；Servo-cylinder on the right side of 8-；Servo-cylinder on the left of 9-；10-level is to pressure transducer；11-vertical pressure sensor；
12-local pressure sensor；13-top pressure transmission plate；Pressure transmission plate on the right side of 14-；Local pressure transmission plate on the left of 15-；Pressure-bearing on the left of 16-
Plate；17-bottom bearing plate；18-acoustic emission probe；19-rock sample.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described in further detail:
As Figure 1-3, monolateral unloading test device under brittle rock mass biaxial stress state, control real including two axis servo
Time add uninstalling system, stress-strain monitoring system, Automated condtrol and data collecting system, acoustic emission monitoring system and portable
Formula image acquisition and the system of analysis；Stress-strain monitoring system, Automated condtrol and data collecting system, acoustic emission monitor(ing) system
System and portable image capture and analysis system control to add uninstalling system in real time with two axis servo respectively and are connected, and stress-strain is supervised
Examining system is connected with Automated condtrol and data collecting system；
Described two axis servo controls to add uninstalling system in real time, is realized rock sample by the coordinated of three tunnel loading systems
The simulation of Biaxial Compression stress state；Two axis servo controls to add uninstalling system in real time and includes the two-way reaction frame of rectangle, two-way counter-force
Top servo-cylinder, right side servo-cylinder and left side servo-cylinder, two-way counter-force it is respectively equipped with on the upper beam of frame, You Liang and left beam
It is coaxial that the underbeam of frame is provided with lower support bar, top servo-cylinder and lower support bar, right side servo-cylinder and left side servo
Oil cylinder is coaxial, and the free end of top servo-cylinder, right side servo-cylinder, left side servo-cylinder and lower support bar is respectively equipped with
Portion's pressure transmission plate, right side pressure transmission plate, left side local pressure transmission plate and bottom bearing plate, local, left side pressure transmission plate is nested in left side bearing plate
Middle part, this kind of arrangement both ensure that the applying of rock sample periphery confined pressure, can effectively carry out again local monolateral unloading；Top
Pressure transmission plate, right side pressure transmission plate, left side bearing plate and bottom bearing plate surround pressure chamber, and rock sample is sandwiched in pressure chamber, by not
On the left of disconnected reduction, the mode of local pressure transmission plate upward pressure realizes the monolateral unloading of rock sample；Wherein, two-way reaction frame, top pressure transmission plate,
Right side pressure transmission plate, left side local pressure transmission plate and bottom bearing plate all use big rigidity dense material, it is ensured that reliability of structure；
Described stress-strain monitoring system, for recording the change of rock sample stress, strain regime, and will collect
Data send Automated condtrol and data collecting system to；Stress-strain monitoring system includes the work being located at left side servo-cylinder
The level in stopper rod exit to pressure transducer, be located at lower support bar lower end vertical pressure sensor, be located at left side servo
The local pressure sensor of pressure transmission plate junction, the piston rod of oil cylinder and left side local and be pasted on the foil gauge on rock sample surface；
Described Automated condtrol and data collecting system, added the control program of uninstall process, automatically control by input
Two axis servo controls to add uninstalling system in real time and is further applied load rock sample, and receives the rock sample that stress-strain monitoring system acquisition arrives
Stress, the data of strain regime；
Described acoustic emission monitoring system, for monitoring crack initiation and the extension evolution parameter of rock sample underbead crack；Acoustic emission
Monitoring system is made up of acoustic emission probe and acoustic emission processing means, the top pressure transmission plate around pressure chamber and bottom bearing plate
On be reserved with the layout points of acoustic emission probe, utilize the acoustic emission of acoustic emission probe and acoustic emission processing means monitoring rock sample to become
Change, and carry out three dimensional sound transmitting location；
Described portable image capture and the system of analysis, by contrast rock sample unloading surface, influence area same tag point
Position difference in different time sequence obtains the strain of its real-time whole audience, to analyze the through trend of crackle；Portable image is adopted
Collection and analysis system are made up of image capture device, storage device and image analysis software.
Two axis servo control add in real time uninstalling system maximum stress in horizontally and vertically both direction all up to
200MPa。
Rock sample dimensions is: 150 × 150 × 150mm, and has the alternate paint of black and white in its surface sprinkling.
Described local, left side pressure transmission board size specification is: 70 × 70 × 10mm.
Top pressure transmission plate, right side pressure transmission plate and local, left side pressure transmission plate all use the mode and each piston rod that Universal-head connects
Connect, process of the test have employed bottom pressure transmission plate the connected mode of Universal-head, overcome and add local, rock sample surface in uninstall process
Irregular impact, to obtain test data the most accurately.
The quantity of acoustic emission probe is eight groups, and the mode using tetragon para-position to arrange is arranged.
Image capture device uses two groups of high-speed CCD camera lenses.
Automated condtrol and data collecting system use the Automated condtrol of panel type and data to show.
The test method of monolateral unloading test device under brittle rock mass biaxial stress state, uses as claimed in claim 1
Brittle rock mass biaxial stress state under monolateral unloading test device test, comprise the following steps:
Step one, process of first being sprayed paint in the scope of freedom, rock sample side, paste foil gauge at its opposite side and will draw
Wire is connected with stress-strain monitoring system, and the rock sample after processing is positioned on the bearing plate of bottom to be ajusted, and adjusts level
Axle and reaction frame upper beam, make top pressure transmission plate, right side pressure transmission plate, left side bearing plate and bottom bearing plate be in close contact with rock sample,
Carry out prestrain, detect the running status of each system；
Step 2, applies vertical F to rock sample respectively by top pressure transmission plate, right side pressure transmission plateVAnd level is to load FH, with
Time by left side local pressure transmission plate apply Local Loads, size isFH, so that load is uniformly distributed on the loading surface of left side,
Wherein a is the left side bearing plate length of side, and b is that local, left side pressure transmission edges of boards are long；
Step 3, the two-dimensional state of stress of maintenance rock sample is until stress, strain value are stable, by local pressure transmission on the left of reducing
The load that plate is transmitted reaches the monolateral unloading to rock sample left surface regional area, and the speed of unloading is controlled by two axis servo
Add uninstalling system in real time to be controlled；With acoustic emission probe, acoustic emission processing means and image capture device record uninstall process
The acoustic emission phenomenon of middle rock sample and the extension trend of coverage internal fissure thereof；
Step 4, drills whole stress in uninstall process, strain, crack initiation and the cracks can spread of adding captured in each system
The characteristic information changing parameter is analyzed, and studies the crack initiation of monolateral unloading area and its domain of influence internal fissure and opens closing characteristics,
And the formation in crack and extension mechanism.
After off-test, use and add Uninstaller automatically and system can be further applied load whole removal, rock sample is taken
Under with its overall failure mode of close-ups.
The above, the only detailed description of the invention in the present invention, but protection scope of the present invention is not limited thereto, and appoints
What is familiar with the people of this technology in the technical scope that disclosed herein, it will be appreciated that the conversion expected or replacement, all should contain
Within the scope of the comprising of the present invention, therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (9)
1. monolateral unloading test device under brittle rock mass biaxial stress state, it is characterised in that: include that two axis servo controls in real time
Add uninstalling system (1), stress-strain monitoring system (2), Automated condtrol and data collecting system (3), acoustic emission monitoring system
(4) and portable image capture and analyze system (5)；Stress-strain monitoring system (2), Automated condtrol and data acquisition system
System (3), acoustic emission monitoring system (4) and portable image capture and the system of analysis (5) control to add in real time with two axis servo respectively
Uninstalling system (1) connects, and stress-strain monitoring system (2) is connected with Automated condtrol and data collecting system (3)；
Described two axis servo controls to add uninstalling system (1) in real time, is realized rock sample by the coordinated of three tunnel loading systems
(19) simulation of Biaxial Compression stress state is carried out；Two axis servo controls to add uninstalling system (1) in real time and includes the two-way counter-force of rectangle
Frame (6), the upper beam of two-way reaction frame (6), You Liang and left beam are respectively equipped with top servo-cylinder (7), right side servo-cylinder (8)
With left side servo-cylinder (9), the underbeam of two-way reaction frame (6) is provided with lower support bar, and top servo-cylinder (7) and bottom are propped up
Strut is coaxial, and right side servo-cylinder (8) and left side servo-cylinder (9) are coaxial, top servo-cylinder (7), right side servo-cylinder
(8), the free end of left side servo-cylinder (9) and lower support bar be respectively equipped with top pressure transmission plate (13), right side pressure transmission plate (14),
Local pressure transmission plate, left side (15) and bottom bearing plate (17), local pressure transmission plate, left side (15) is nested in left side bearing plate (16)
Portion, top pressure transmission plate (13), right side pressure transmission plate (14), left side bearing plate (16) and bottom bearing plate (17) surround pressure chamber, rock
Sample (19) is sandwiched in pressure chamber, realizes that rock sample is monolateral to be unloaded on the left of constantly reducing by the way of pressure transmission plate (15) upward pressure of local
Carry；
Described stress-strain monitoring system (2), is used for recording rock sample (19) stress, the change of strain regime, and will collect
Data send Automated condtrol and data collecting system (3) to；Stress-strain monitoring system (2) includes being located at left side servo
The level in the piston rod exit of oil cylinder (9) to pressure transducer (10), be located at lower support bar lower end vertical pressure sensing
Device (11), the piston rod being located at left side servo-cylinder (9) and the local pressure sensor of pressure transmission plate (15) junction, local, left side
And be pasted on the foil gauge on rock sample (19) surface (12)；
Described Automated condtrol and data collecting system (3), add the control program of uninstall process by input, automatically controls double
Axle SERVO CONTROL adds uninstalling system (1) in real time and is further applied load rock sample (19), and receives stress-strain monitoring system (2) collection
Rock sample (19) stress that arrives, the data of strain regime；
Described acoustic emission monitoring system (4), is used for monitoring the crack initiation of rock sample (19) underbead crack and extension evolution parameter；Sound is sent out
Penetrate monitoring system (4) to be made up of acoustic emission probe and acoustic emission processing means, top pressure transmission plate (13) around pressure chamber and
It is reserved with the layout points of acoustic emission probe (18) on bottom bearing plate (17), utilizes acoustic emission probe and acoustic emission processing means prison
Survey the acoustic emission change of rock sample (19), and carry out three dimensional sound transmitting location；
Described portable image capture and the system of analysis (5), by the identical mark in contrast rock sample (19) unloading surface, influence area
Position difference in note point different time sequence obtains the strain of its real-time whole audience, to analyze the through trend of crackle；Portable figure
As collection and the system of analysis (5) are made up of image capture device, storage device and image analysis software.
Monolateral unloading test device under brittle rock mass biaxial stress state the most according to claim 1, it is characterised in that: double
Axle SERVO CONTROL adds the uninstalling system (1) maximum stress in horizontally and vertically both direction in real time all up to 200MPa.
Monolateral unloading test device under brittle rock mass biaxial stress state the most according to claim 1, it is characterised in that: rock
Sample (19) dimensions is: 150 × 150 × 150mm, and has the alternate paint of black and white in its surface sprinkling.
Monolateral unloading test device under brittle rock mass biaxial stress state the most according to claim 1, it is characterised in that: institute
Local, left side pressure transmission plate (15) dimensions stated is: 70 × 70 × 10mm.
Monolateral unloading test device under brittle rock mass biaxial stress state the most according to claim 1, it is characterised in that on:
Portion's pressure transmission plate (13), right side pressure transmission plate (14) and local pressure transmission plate, left side (15) all use the mode and each piston that Universal-head connects
Bar connects.
Monolateral unloading test device under brittle rock mass biaxial stress state the most according to claim 1, it is characterised in that: sound
The quantity of transmitting probe (18) is eight groups, and the mode using tetragon para-position to arrange is arranged.
Monolateral unloading test device under brittle rock mass biaxial stress state the most according to claim 1, it is characterised in that: figure
As collecting device uses two groups of high-speed CCD camera lenses.
Monolateral unloading test device under brittle rock mass biaxial stress state the most according to claim 1, it is characterised in that: from
Dynamicization controls and data collecting system (3) uses the Automated condtrol of panel type and data to show.
9. the test method of monolateral unloading test device under brittle rock mass biaxial stress state, uses as claimed in claim 1
Under brittle rock mass biaxial stress state, monolateral unloading test device is tested, it is characterised in that: comprise the following steps:
Step one, process of first being sprayed paint in rock sample (19) scope of freedom, side, paste foil gauge at its opposite side and will draw
Wire is connected with stress-strain monitoring system (2), and the rock sample (19) after processing is positioned on bottom bearing plate (17) and puts
Just, adjust trunnion axis and reaction frame upper beam, make top pressure transmission plate (13), right side pressure transmission plate (14), left side bearing plate (16) and under
Portion's bearing plate (17) is in close contact with rock sample, carries out prestrain, detects the running status of each system；
Step 2, applies vertical F to rock sample (19) respectively by top pressure transmission plate (13), right side pressure transmission plate (14)VAnd level is to lotus
Carry FH, applying Local Loads by local pressure transmission plate, left side (15) simultaneously, size isSo that load loads in left side
Being uniformly distributed on face, wherein a is left side bearing plate (16) length of side, and b is local, left side pressure transmission plate (15) length of side；
Step 3, the two-dimensional state of stress of maintenance rock sample (19) is until stress, strain value are stable, by local pressure transmission on the left of reducing
The load that plate (15) is transmitted reaches the monolateral unloading to rock sample (19) left surface regional area, and the speed of unloading passes through twin shaft
SERVO CONTROL adds uninstalling system (1) in real time and is controlled；Remember with acoustic emission probe, acoustic emission processing means and image capture device
Record acoustic emission phenomenon and the extension trend of coverage internal fissure thereof of rock sample in uninstall process；
Step 4, to each system is captured whole add stress in uninstall process, strain, crack initiation and cracks can spread develop ginseng
The characteristic information of number is analyzed, and studies the crack initiation of monolateral unloading area and its domain of influence internal fissure and opens closing characteristics, and
The formation in crack and extension mechanism.
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