CN107271282B - A kind of experimental rig for testing rock fracture toughness - Google Patents
A kind of experimental rig for testing rock fracture toughness Download PDFInfo
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- CN107271282B CN107271282B CN201710600178.3A CN201710600178A CN107271282B CN 107271282 B CN107271282 B CN 107271282B CN 201710600178 A CN201710600178 A CN 201710600178A CN 107271282 B CN107271282 B CN 107271282B
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- guide post
- main shaft
- fracture toughness
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- fixture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The invention discloses a kind of experimental rig for testing rock fracture toughness, including pedestal, erecting bed is provided on pedestal, the intermediate position of erecting bed upper surface is fixedly installed with deck, is provided with liner above deck, is provided with workpiece for measurement on liner；The arranged on left and right sides that the upper surface of erecting bed is located at deck is respectively arranged with a guide post, workpiece clamping element is provided between two guide posts, the top of two guide posts is provided with guide post compression beam, the centre of guide post compression beam is provided with main shaft fixture, main shaft is vertically installed in main shaft fixture, the lower end of main shaft is provided with fixture, and fixture lower end is connected with loading axis, and loading axis lower end passes through the through-hole opened up on workpiece clamping element and contacts with workpiece for measurement.The device passes through rotation workpiece for measurement, it may be implemented to be arranged different confining pressures, different crackles inclination angle, various boundary and the different stress paths such as add unloading, original single measurement means are improved, the fracture toughness of rock difference fracture mode can be measured at different conditions.
Description
Technical field
The present invention relates to Geotechnical Engineering field, in particular to a kind of experimental rig for testing rock fracture toughness.
Background technique
In rock engineering, in order to ensure the safety and stability of engineering structure, need that rock is avoided to be broken, and
In tunnel piercing, slope excavating, oil-gas mining, and needs to accelerate phenomenon of rupture, improves efficiency of breaking rock.Rock fracture toughness is made
To characterize the mechanics parameter that rock material resists fracture in rock fracture mechanics, weight is all had in engineer application and theoretical research
The value wanted.According to the difference of cracks in body load mode, fracture can be divided into I type (opening mode), II type (sliding mode) and
Three kinds of basic models of type III (tearing mode), correspondingly, fracture toughness can also be subdivided into I type, II type and type III fracture toughness, i.e.,
KIc, KIIc and KIIIc.In the structure design, security evaluation and numerical simulation of rock engineering, KIc, KIIc and KIIIc are often
It is indispensable basic mechanical parameter.Therefore, developing easy test method accurately to test fracture toughness is that rock is disconnected
Split an important subject in mechanics.
Summary of the invention
The purpose of the present invention is to provide a kind of experimental rigs for testing rock fracture toughness, to solve above-mentioned background technique
The problem of middle proposition.
The present invention provides a kind of experimental rig for testing rock fracture toughness, including pedestal, it is provided on the pedestal
Erecting bed, the intermediate position of the erecting bed upper surface are fixedly installed with deck, are provided with liner, the lining above the deck
Workpiece for measurement is provided on pad；Be respectively fixedly connected with positioning plate on the forward and backward surface of the erecting bed, the positioning plate it is upper
It is provided with screw rod, one end of the screw rod and workpiece for measurement are closely；The upper surface of the erecting bed is located at the arranged on left and right sides of deck
It is respectively arranged with a guide post, is provided with workpiece clamping element between two guide posts, the top of two guide posts, which is provided with, leads
Column compression beam, the centre of the guide post compression beam is provided with main shaft fixture, is vertically equipped with main shaft in the main shaft fixture, described
The lower end of main shaft is provided with fixture, and the fixture lower end is connected with loading axis, and the loading axis lower end passes through workpiece clamping element
On the through-hole that opens up contacted with workpiece for measurement.
Preferably, the deck center setting is fluted, liner is movably placed in groove, in the center and loading axis of groove
The heart is vertically overlapped.
Preferably, the upper end of the guide post is connect by bolt with guide post compression beam.
Preferably, being provided with spring on guide post between the guide post compression beam and workpiece clamping element.
Preferably, being connected with micrometer at the top of the main shaft.
The present invention compared to the prior art, the advantage is that:
A kind of experimental rig for testing rock fracture toughness provided by the invention, the device, can by rotation workpiece for measurement
Different confining pressures, different crackles inclination angle, various boundary and the different stress paths such as add unloading are set to realize, and then can be real
To band precrack cylinder rock sample diametral compression test under existing different stress；Original single measurement means are improved, it can
To measure the fracture toughness of rock difference fracture mode at different conditions；It can be opened, sheared or mixed with actual response rock mass
Form when type destroys is further to study its failure mechanism basis；Experimental rig design of the present invention is reasonable, the side of operating with
Just, the diametral compression test suitable for all kinds of rock samples.
Detailed description of the invention
Fig. 1 is a kind of experimental rig structural schematic diagram for testing rock fracture toughness provided by the invention.
Description of symbols:
1, pedestal；2, erecting bed；3, deck；4, it pads；5, workpiece for measurement；6, positioning plate；7, screw rod；8, guide post；9, work
Part clamping element；9-1, through-hole；10, guide post compression beam；11, main shaft；12, fixture；13, loading axis；14, main shaft clip；15, spiral shell
Bolt；16, spring；17, amesdial.
Specific embodiment
With reference to the accompanying drawing, the specific embodiment of the present invention is described in detail, it is to be understood that of the invention
Protection scope be not limited by the specific implementation.
As shown in Figure 1, the embodiment of the invention provides a kind of experimental rig for testing rock fracture toughness, including pedestal 1,
Erecting bed 2 is provided on the pedestal 1, the intermediate position of 2 upper surface of erecting bed is fixedly installed with deck 3, the deck 3
Top is provided with liner 4, is provided with workpiece for measurement 5 on the liner 4；It is fixed respectively on the forward and backward surface of the erecting bed 2 to connect
It is connected to positioning plate 6, screw rod 7 is provided on the positioning plate 6, one end of the screw rod 7 and workpiece for measurement 5 are closely；The peace
The arranged on left and right sides that the upper surface of dress platform 2 is located at deck 3 is respectively arranged with a guide post 8, is provided between two guide posts 8
Workpiece clamping element 9, the top of two guide posts 8 are provided with guide post compression beam 10, and the centre of the guide post compression beam 10 is provided with
Main shaft fixture 14 is vertically equipped with main shaft 11 in the main shaft fixture 14, and the lower end of the main shaft 11 is provided with fixture 12, described
12 lower end of fixture is connected with loading axis 13,13 lower end of loading axis pass through the through-hole 9-1 that is opened up on workpiece clamping element 9 with to
Workpiece 5 is surveyed to contact.
In embodiments of the present invention, the 3 center setting of deck is fluted, and liner 4 is movably placed in groove, in groove
The heart is vertically overlapped with 13 center of loading axis；The upper end of the guide post 8 is connect by bolt 15 with guide post compression beam 10；The guide post
Spring 16 is provided on guide post 8 between compression beam 10 and workpiece clamping element 9；The top of the main shaft 11 is connected with micrometer
17。
The calculation formula for testing rock fracture toughness is as follows:
In formula: Pq- critical load, B-sample thickness, W-specimen width, a-crack length.
In conclusion a kind of experimental rig for testing rock fracture toughness provided in an embodiment of the present invention, the device pass through
Workpiece for measurement is rotated, may be implemented to be arranged different confining pressures, different crackles inclination angle, various boundary and the different stress such as add unloading
Path, and then may be implemented under different stress to band precrack cylinder rock sample diametral compression test；Improve original list
One measurement means can measure the fracture toughness of rock difference fracture mode at different conditions；It can be with actual response rock mass
Form when opening, shearing or mixed type are destroyed is further to study its failure mechanism basis；Experimental rig design of the present invention is closed
Reason, easy for operation, the diametral compression test suitable for all kinds of rock samples.
Disclosed above is only several specific embodiments of the invention, and still, the embodiment of the present invention is not limited to this, is appointed
What what those skilled in the art can think variation should all fall into protection scope of the present invention.
Claims (5)
1. a kind of experimental rig for testing rock fracture toughness, including pedestal (1) is provided with erecting bed on the pedestal (1)
(2), the intermediate position of erecting bed (2) upper surface is fixedly installed with deck (3), is provided with liner above the deck (3)
(4), workpiece for measurement (5) are provided on the liner (4)；It is characterized in that, on the forward and backward surface of the erecting bed (2) respectively
It is fixedly connected with positioning plate (6), is provided with screw rod (7) on the positioning plate (6), one end of the screw rod (7) and work to be measured
Part (5) is closely；The arranged on left and right sides that the upper surface of the erecting bed (2) is located at deck (3) is respectively arranged with a guide post (8), institute
It states and is provided with workpiece clamping element (9) between two guide posts (8), the top of two guide posts (8) is provided with guide post compression beam (10),
The centre of the guide post compression beam (10) is provided with main shaft fixture (14), is vertically equipped with main shaft in the main shaft fixture (14)
(11), the lower end of the main shaft (11) is provided with fixture (12), and fixture (12) lower end is connected with loading axis (13), described to add
The through-hole (9-1) that axis (13) lower end opens up on workpiece clamping element (9) is carried to contact with workpiece for measurement (5).
2. the experimental rig of test rock fracture toughness as described in claim 1, which is characterized in that deck (3) center
Be arranged it is fluted, liner (4) be movably placed in groove, the center of groove is vertically overlapped with loading axis (13) center.
3. as described in claim 1 test rock fracture toughness experimental rig, which is characterized in that the guide post (8) it is upper
End is connect by bolt (15) with guide post compression beam (10).
4. the experimental rig of test rock fracture toughness as described in claim 1, which is characterized in that the guide post compression beam
(10) spring (16) are provided on the guide post (8) between workpiece clamping element (9).
5. the experimental rig of test rock fracture toughness as described in claim 1, which is characterized in that the top of the main shaft (11)
Portion is connected with micrometer (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710600178.3A CN107271282B (en) | 2017-07-21 | 2017-07-21 | A kind of experimental rig for testing rock fracture toughness |
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|---|---|---|---|
| CN201710600178.3A CN107271282B (en) | 2017-07-21 | 2017-07-21 | A kind of experimental rig for testing rock fracture toughness |
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| CN107271282A CN107271282A (en) | 2017-10-20 |
| CN107271282B true CN107271282B (en) | 2019-06-25 |
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| CN108459035B (en) * | 2018-02-11 | 2020-09-29 | 中国科学院高能物理研究所 | Portable in-situ multi-field coupling loading device for neutron scattering |
| FR3089012B1 (en) * | 2018-11-23 | 2022-06-10 | Safran Aircraft Engines | MECHANISM FOR THE IMPLEMENTATION OF BRAZILIAN TESTS |
| CN109668777B (en) * | 2019-03-01 | 2021-04-09 | 防城港市十一冶混凝土有限公司 | Test auxiliary device for detecting concrete splitting tensile strength |
| CN113358473B (en) * | 2021-06-21 | 2023-10-27 | 重庆交通大学 | Special test device of rock fracture toughness convenient to direct field work |
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| CN105352803A (en) * | 2015-11-30 | 2016-02-24 | 四川大学 | Multi-angle loading pressure head system for Brazilian split test |
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| CN107271282A (en) | 2017-10-20 |
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Inventor after: Duo Yili Inventor after: Xie Yujun Inventor after: Huang Shanbo Inventor after: Yang Xuefeng Inventor after: Sun Tie Inventor after: Liu Ming Inventor after: Hai Jun Inventor before: Duo Yili Inventor before: Hai Jun Inventor before: Xie Yujun Inventor before: Huang Shanbo Inventor before: Wang Wenguang |
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