CN103105338A - Microscopic cracking evolution process test equipment for bifacial shearing of coal petrography - Google Patents
Microscopic cracking evolution process test equipment for bifacial shearing of coal petrography Download PDFInfo
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- CN103105338A CN103105338A CN2013100251132A CN201310025113A CN103105338A CN 103105338 A CN103105338 A CN 103105338A CN 2013100251132 A CN2013100251132 A CN 2013100251132A CN 201310025113 A CN201310025113 A CN 201310025113A CN 103105338 A CN103105338 A CN 103105338A
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Abstract
The invention discloses microscopic cracking evolution process test equipment for bifacial shearing of coal petrography. The test equipment comprises a body, wherein the body is provided with a test piece cavity which is internally provided with a support; the top wall of the body is of a split structure and comprises a left top wall and a right top wall which are symmetrical in structure and are arranged at an interval to form a pressure head installation port; the front and rear ends of the body are provided with openings; a groove is formed in the part, which is over against the pressure head installation port, of the support; the left side wall of the body is provided with a guide hole; the front and rear parts of the left top wall are symmetrically provided with a first fastening bolt hole and a second fastening bolt hole which are communicated with each other; and the right top wall is provided with a third fastening bolt hole and a fourth fastening bolt hole which are symmetrical with the first fastening bolt hole and the second fastening bolt hole. The test equipment provided by the invention has the characteristics of wide adaptability, simple structure, low processing cost, high reliability, convenience in operation and the like.
Description
Technical field
The present invention relates to a kind of device that coal petrography is carried out dual shear test.
Background technology
Along with the increasing year by year of coal mining scale and intensity, the coal rock dynamic disasters such as rock burst, coal and Gas Outburst, roof accident are day by day serious.Wherein, rock burst with its suddenly, sharply, fierce destructive characteristics serious threat the safety in production in mine, caused huge economic loss and casualties to China's coal-mine.As a kind of mine power disaster phenomenon, rock burst is normally when the coal petrography mechanical system reaches strength degree, accumulate in the elastic energy sudden outburst in coal and rock, cause the coal and rock vibration and destroy, and coal petrography is thrown to roadway, cause the destruction of support, equipment and roadway and personnel's injures and deaths etc.Along with the continuous increase of the coal mining degree of depth and intensity, impact mine and the rock burst extent of injury and be obvious ascendant trend.Therefore, carry out the research of rock burst in a deep going way, for guaranteeing that the mine safety High-efficient Production is significant.In addition, along with the increase of mining depth, the deterioration of geologic condition, coal and gas burst accident take place frequently, and the safety in production of China's coal-mine in serious threat.How being familiar with coal and gas outburst mechanism and proposing according to this corresponding FORECAST AND PREVENTION measure, improve the safe coefficient that China's coal-mine is produced, is also the science difficult problem that need to be resolved hurrily of pendulum in face of the coal industry researcher.
The coal rock dynamic disasters such as rock burst, coal and Gas Outburst, roof accident are all closely related with coal and rock two-sided cutting fracture and disrumpent feelings mechanism.Therefore, carry out the two-sided cutting Research on Mechanical Properties of coal and rock under different affecting factors, particularly from meso-scale, to the generation of crackle in coal petrography shear failure process, expansion until the dynamic process of fracture study, can be stope Roof Breaking process, rock burst, coal and give the more explanation of science to relevant dynamic phenomenons such as Gas Outbursts, to disclosing to a deeper level rock burst, coal and gas outburst mechanism and more scientificly reasonably proposing the FORECAST AND PREVENTION measure and have important theory value and Engineering Guidance meaning.
Existing research equipment mainly is confined to the research of rock mass discontinuity slippage mechanical characteristic, concrete strength, steel member shear property, and load mode is single, as the shearing test device that discloses in CN10194982B.Also lacking at present a kind of effective test method and Special Equipment carries out the coal petrography material be subjected to research aspect various influence factor coal petrography material internals and surface crack cracking expansion Evolution under the two-sided cutting load.
Therefore those skilled in the art are devoted to develop and a kind ofly can carry out to test specimen the device of dual shear test.
Summary of the invention
Because the defects of prior art, technical matters to be solved by this invention is to provide a kind ofly can carry out to test specimen the device of dual shear test.
For achieving the above object, the invention provides a kind of coal petrography double shear and chop up sight cracking evolutionary process test unit, comprise body; Be provided with the test specimen chamber on described body; Described test specimen is provided with bearing in the chamber; The roof of described body is split-type structural, comprises left roof and the right roof of structural symmetry; Described left roof and the interval setting of right roof consist of the pressure head installing port; The rear and front end of described body is opening;
Described bearing is provided with groove over against described pressure head installing port place; The left side wall of described body is provided with pilot hole.
For ease of test specimen is installed, the shape of described left roof and right roof is end to end rectangle and trapezoidal, and two trapezoidal upper bases are relative.
For improving test accuracy, the rear end lower of described body, the left and right sides are symmetrically arranged with the first bolt and the second bolt; The middle part, rear end of described body, the left and right sides are symmetrically arranged with the 3rd bolt and the 4th bolt.
For ease of operation, the front end bottom of described body, the left and right sides are symmetrically arranged with the first push-and-pull post and the second push-and-pull post.
Better, described the first push-and-pull post and the second push-and-pull post are threaded with described body.
For improving test effect, the width of described groove is 40mm; The bottom surface of described groove and the bottom surface of described body distance are 38mm; The end face of described bearing and the bottom surface of described body distance are 50mm; The center line of described pilot hole and the bottom surface of described body distance are 70mm.
The invention has the beneficial effects as follows:
(1) the present invention can be used for flowing the two-sided cutting mechanical test of coal petrography and middle hazardous rock under solid coupling, shear fine observation mechanical test in particular for coal petrography under the gas pressure effect more reliable research technique is provided, for providing a new test method from thin sight angle research rock burst, coal and gas outburst mechanism.
(2) the present invention both can carry out restricted two-sided cutting, also can carry out non-limiting dual shear test, both can carry out the two-sided cutting fine observation mechanical test of coal containing methane gas rock, also can carry out the two-sided cutting fine observation mechanical test of coal containing methane gas rock not or rock, the installation of test specimen, debugging and dismounting are also more convenient.
(3) have simple in structurely in global design of the present invention, processing cost is low, good reliability, the characteristics such as easy to operate.
(4) the present invention is satisfying under the prerequisite of requirement of experiment, and the size of each parts is optimized, and has both satisfied structural simplification, has also improved test accuracy simultaneously, and has greatly reduced processing cost.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention.
Fig. 2 is the plan structure schematic diagram of Fig. 1.
Fig. 3 is the left TV structure schematic diagram of Fig. 1.
Fig. 4 is test specimen scheme of installation of the present invention.
Fig. 5 is load test schematic diagram of the present invention.
Fig. 6 is the plan structure schematic diagram of Fig. 5.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
As shown in Figure 1 to Figure 3, a kind of coal petrography double shear chops up sees cracking evolutionary process test unit, comprises body 1, is provided with test specimen chamber 2 on body 1.
The roof of body 1 is split-type structural, comprises left roof 1a and the right roof 1b of structural symmetry, and left roof 1a and right roof 1b interval setting consist of pressure head installing port 3.The shape of left roof 1a and right roof 1b is end to end rectangle and trapezoidal, and two trapezoidal upper bases are relative.
The rear and front end of body 1 is opening.
Be provided with bearing 4 in test specimen chamber 2, bearing 4 is provided with groove 5 over against pressure head installing port 3 places.The left side wall of body 1 is provided with pilot hole 6.The width L1 of groove 5 is 40mm; The bottom surface distance L 2 of the bottom surface of groove 5 and body 1 is 38mm; The bottom surface distance L 3 of the end face of bearing 4 and body is 50mm; The bottom surface distance L 4 of the center line of pilot hole 6 and body is 70mm.
The rear end lower of body 1, the left and right sides are symmetrically arranged with the first bolt 7a and the second bolt 7b; The middle part, rear end of body 1, the left and right sides are symmetrically arranged with the 3rd bolt 7c and the 4th bolt 7d.
The front end bottom of body 1, the left and right sides are symmetrically arranged with the first push-and-pull post 8a and the second push-and-pull post 8b.The first push-and-pull post 8a and the second push-and-pull post 8b are threaded with body 1.
Be symmetrically arranged with the first tightening screw 9a and the second tightening screw 9b of perforation before and after left roof 1a is upper; Be provided with the 3rd tightening screw 9c and the 4th tightening screw 9d with the first tightening screw 9a and the second tightening screw 9b symmetry on right roof 1b.
Utilize the present invention to test according to the following steps:
(1) test material preparation.
(2) test specimen is installed: as shown in Figure 4 test specimen 14 is placed on bearing 4, the middle 40mm length of test specimen is over against groove 5, and each uses 10 clampings of test specimen positioning pressuring plate arranged on left and right sides; Be screwed into tight fixed bolt 11 in each tightening screw, place spacing backing plate 12 under corresponding each tight fixed bolt 11 on test specimen, tighten each tight fixed bolt 11; Vertical transition pressure head 15 is placed in pressure head installing port 3 places, and side direction transition pressure head 13 is placed in pilot hole 6, and side direction transition pressure head 13 props up the positioning pressuring plate in left side, as shown in Figure 5.
(3) installation.As shown in Figure 5 and Figure 6, the chuck body that discloses in CN10194982B is positioned on the pressure testing machine loading bench, and adjusts the position according to the observed ray of crackle recording geometry, vertical last item and testing machine loading head be in the same center line; Acoustic emission probe is attached on the non-inspection surface of test specimen, and will pops one's head in the acoustic emission signal transmission line and connect with computer system; Utilize two push-and-pull posts above-mentioned test unit 100 to be put into the test cavity of chuck body 200, utilize four bolts on above-mentioned test unit to locate; Vertical last item is contacted with side direction transition pressure head with vertical transition pressure head respectively with the side direction last item, apply certain pretightning force for respectively vertical last item and side direction last item with pressure testing machine and hydraulic oil pump; First-class front/rear cover seals test cavity; Connect the gas feed system; Connect the crackle recording geometry; And check whether each system works is normal.
(4) vacuum outgas.The impermeability of gauging fixture body test cavity is opened three-way valve, carries out degassedly with vacuum pump, and general 2-3h of degassed time is to guarantee good degasifying effect.
(5) inflation adsorption equilibrium.After degassed, close three-way valve, regulate the high pressure methane steel cylinder valve of giving vent to anger, apply predetermined gas pressure, to the test interacvity air-filling of chuck body, inflationtime is generally 24h, makes the abundant adsorption equilibrium of coal sample gas.
(6) test.Opening pressure testing machine and each measuring system are carried out loading under different condition according to the testing program of formulating; By pressure testing machine system log (SYSLOG) shear stress and shear displacemant; Record by acoustic emission system the acoustic emission signal that the test specimen internal injury sends; Development and seizure picture by crackle recording geometry observation crackle.After a test specimen is finished, the dismounting test specimen, and repeat (2)-(6) step and carry out the next round test.
(7) location parameter.The parameter that records has: the picture of shear stress, shear displacemant, gas pressure, normal stress, crack growth and make video recording, acoustic emission signal etc.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art need not creative work and just can design according to the present invention make many modifications and variations.Therefore, all technician in the art all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (6)
1. a coal petrography double shear chops up and sees cracking evolutionary process test unit, it is characterized in that: comprise body (1); Be provided with test specimen chamber (2) on described body (1); Be provided with bearing (4) in described test specimen chamber (2); The roof of described body (1) is split-type structural, comprises left roof (1a) and the right roof (1b) of structural symmetry; Described left roof (1a) and right roof (1b) interval setting consist of pressure head installing port (3); The rear and front end of described body (1) is opening; Described bearing (4) locates to be provided with groove (5) over against described pressure head installing port (3); The left side wall of described body (1) is provided with pilot hole (6); Be symmetrically arranged with the first tightening screw (9a) and the second tightening screw (9b) of perforation before and after described left roof (1a) is upper; Be provided with the 3rd tightening screw (9c) and the 4th tightening screw (9d) with described the first tightening screw (9a) and the second tightening screw (9b) symmetry on described right roof (1b).
2. coal petrography double shear as claimed in claim 1 chops up and sees cracking evolutionary process test unit, and it is characterized in that: the shape of described left roof (1a) and right roof (1b) is end to end rectangle and trapezoidal, and two trapezoidal upper bases are relative.
3. coal petrography double shear as claimed in claim 1 chops up and sees cracking evolutionary process test unit, and it is characterized in that: rear end lower, the left and right sides of described body (1) is symmetrically arranged with the first bolt (7a) and the second bolt (7b); The middle part, rear end of described body (1), the left and right sides are symmetrically arranged with the 3rd bolt (7c) and the 4th bolt (7d).
4. coal petrography double shear as claimed in claim 1 chops up and sees cracking evolutionary process test unit, and it is characterized in that: front end bottom, the left and right sides of described body (1) is symmetrically arranged with the first push-and-pull post (8a) and the second push-and-pull post (8b).
5. coal petrography double shear as claimed in claim 4 chops up and sees cracking evolutionary process test unit, and it is characterized in that: described the first push-and-pull post (8a) and the second push-and-pull post (8b) are threaded with described body (1).
6. coal petrography double shear as claimed in claim 1 chops up and sees cracking evolutionary process test unit, and it is characterized in that: the width (L1) of described groove (5) is 40mm; The bottom surface distance (L2) of the bottom surface of described groove (5) and described body (1) is 38mm; The end face of described bearing (4) and the bottom surface of described body distance (L3) are 50mm; The center line of described pilot hole (6) and the bottom surface of described body distance (L4) are 70mm.
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| CN201310025113.2A CN103105338B (en) | 2013-01-23 | 2013-01-23 | Coal petrography double shear chops up sees cracking evolutionary process test unit |
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| CN201310025113.2A CN103105338B (en) | 2013-01-23 | 2013-01-23 | Coal petrography double shear chops up sees cracking evolutionary process test unit |
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Cited By (8)
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|---|---|---|---|---|
| CN103471907A (en) * | 2013-09-17 | 2013-12-25 | 东北大学 | Double-shear clamp and test method applied to rock triaxial test |
| CN104344989A (en) * | 2013-07-29 | 2015-02-11 | 青岛理工大学 | Externally bonded FRP double-side shear test loading device |
| CN105823694A (en) * | 2016-05-04 | 2016-08-03 | 重庆大学 | Rock mass shear test equipment |
| CN106644762A (en) * | 2016-12-23 | 2017-05-10 | 大连理工大学 | Double-sided direct shear test device for fiber concrete |
| CN107014701A (en) * | 2017-03-17 | 2017-08-04 | 中航复合材料有限责任公司 | The method for testing shear strength of ceramic base compound material pin |
| CN109142028A (en) * | 2018-08-20 | 2019-01-04 | 山东科技大学 | Working face driving causes coal seam deformation experimental rig |
| CN110823803A (en) * | 2019-11-29 | 2020-02-21 | 南京绿色增材智造研究院有限公司 | Method for testing bonding strength between 3D printing concrete layers |
| CN113049405A (en) * | 2021-03-19 | 2021-06-29 | 东北大学 | Non-demolding remolded rock-soil material double-sided shear test device and method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344989A (en) * | 2013-07-29 | 2015-02-11 | 青岛理工大学 | Externally bonded FRP double-side shear test loading device |
| CN103471907A (en) * | 2013-09-17 | 2013-12-25 | 东北大学 | Double-shear clamp and test method applied to rock triaxial test |
| CN105823694A (en) * | 2016-05-04 | 2016-08-03 | 重庆大学 | Rock mass shear test equipment |
| CN105823694B (en) * | 2016-05-04 | 2019-07-12 | 重庆大学 | Rockmass shear test equipment |
| CN106644762A (en) * | 2016-12-23 | 2017-05-10 | 大连理工大学 | Double-sided direct shear test device for fiber concrete |
| CN107014701A (en) * | 2017-03-17 | 2017-08-04 | 中航复合材料有限责任公司 | The method for testing shear strength of ceramic base compound material pin |
| CN109142028A (en) * | 2018-08-20 | 2019-01-04 | 山东科技大学 | Working face driving causes coal seam deformation experimental rig |
| CN109142028B (en) * | 2018-08-20 | 2020-11-03 | 山东科技大学 | Coal seam deformation test device caused by working face tunneling |
| CN110823803A (en) * | 2019-11-29 | 2020-02-21 | 南京绿色增材智造研究院有限公司 | Method for testing bonding strength between 3D printing concrete layers |
| CN113049405A (en) * | 2021-03-19 | 2021-06-29 | 东北大学 | Non-demolding remolded rock-soil material double-sided shear test device and method |
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| CN103105338B (en) | 2016-03-30 |
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