CN104897322A - Bearing plate collecting vertical stress of each point on coal-rock mass end face in real time - Google Patents
Bearing plate collecting vertical stress of each point on coal-rock mass end face in real time Download PDFInfo
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- CN104897322A CN104897322A CN201510346615.4A CN201510346615A CN104897322A CN 104897322 A CN104897322 A CN 104897322A CN 201510346615 A CN201510346615 A CN 201510346615A CN 104897322 A CN104897322 A CN 104897322A
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- carrier bar
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Abstract
A bearing plate collecting vertical stress of each point on a coal-rock mass end face in real time mainly comprises a bearing rod, bearing rings, vertical strain gauges, horizontal strain gauges, a line and a pedestal; the features are that the bearing rod is arranged in the center and sleeved by a plurality of bearing rings; the number of the bearing rings correspondingly changes according to the size of a measured rock sample; a compensation gap is arranged between adjacent bearing rings; a middle lower portion of the bearing rod and bearing rings is provided with an annular slot; the horizontal strain gauges and vertical strain gauges are arranged in the annular slot, arranged in pairs and connected with the line; one side on the lower portion of the bearing ring is provided with a line concentration slot; the downmost end of the bearing ring is provided with a horizontal groove; the line concentration slot and the horizontal groove are on a same vertical line and mutually matched so as to output the line; the bottom of the bearing rod and the bearing rings is provided with the pedestal. The bearing plate is strong in adaptability and good in technical effect, can remove test piece end face effect in a single shaft compression process, and can realize the test piece end face vertical stress collection.
Description
Technical field
the present invention relates to the proving installation of coal and rock end face stress, particularly a kind of bearing plate of Real-time Collection coal and rock end face each point perpendicular stress.
Background technology
in Geotechnical Engineering and mining engineering field, the mechanical property of understanding rock or coal body is one of major premise of carrying out successive projects, only after fully grasping the every mechanics parameter of rock, could fully assess the possibility of engineering construction and instruct it.Total institute is known, and rock is the heterogeneous material possessing natural defect, and its every mechanical index needs on-the-spot and Laboratory Evaluation test to combine just can obtain defining of accurate science.Carry out at labs the test of its mechanical property is many under current technical status, according to the unified standard that ISRM reaches, its common method of testing has uniaxial compression method, triaxial compressions method and Brazilian split the law.Wherein uniaxial compression test is used for measuring the axis of rock sample under uniaxial tension condition and radial direction (transverse direction) strain value, and calculate elastic modulus and the Poisson ratio of rock further, simple to operate, reliable results, consuming time shorter, therefore the application of uniaxial compression test in material properties of rock mensuration is very extensively and approved by international counterparts.
in recent years, acoustic emission test technology also plays important role in material properties of rock mensuration, acoustic emission can detect and the rule that in inverting rock failure mechanism of rock process, internal crack is expanded, extended, crosses preferably, its rule drawn can test with uniaxial compression the accuracy that the rule drawn cooperatively interacts to improve test result, and these internal injury mechanism aspects being applied in rock sample seem particularly important and extensive.Acoustic emission test technology and uniaxial compression test the crack closing stress threshold value can known in rock sample destructive process that be combined with each other, crack initiation stress threshold, damage dilatancy threshold value and peak stress threshold value, possess the feature of source of damage location based on acoustic emission, this technology can the originated location of precise positioning rock sample internal sabotage and Extended workflow-net simultaneously.
but acoustic emission and uniaxial compression test are also subject to certain limitation.This limitation main manifestations is both ways: one is that the stress that uniaxial compression causes is concentrated, this stress concentrates on the whole end face of rock sample and embodies all to some extent, but mainly concentrate on the central shaft annex of rock sample, thus cause the uneven distribution situation of end stress, and when approaching peak stress, stress herein even can higher than the original uniaxial compressive strength of sample, and this disturbs the accuracy that rock sample mechanics parameter exports greatly.Main cause is that the transversely deforming of rock sample is put to the test the impact of the upper and lower pressure-bearing platform of machine to a great extent, especially upper and lower end face.The transversely deforming that axle pressure between end face and pressure-bearing platform and horizontal friction resistance effect cause test specimen originally should embody is limited, thus it is concentrated to cause stress, and it is more then obvious the closer to test specimen axle portion that this stress is concentrated with embodying.Second aspect is the interference to acoustic emission, and in fact reasonably situation is: be detected in earlier stage little acoustic emission test specimen of uniaxial compression experiment.But just because of End frictional effect, rock microparticle on end face and will roll, and rotate between pressure-bearing platform and broken, these small events will be considered to rock self acoustic emission signal and captured, thus in the degree of accuracy of severe jamming acoustic emission detection virtually.Especially, when acoustic emission location needs, the acoustic emission source possibility integrated distribution of detection in early stage is in position, upper and lower end face, and this acoustic emission source to final integral location will produce great error interference.
therefore be badly in need of a kind of strong adaptability, technique effect is good, rock or the coal body of varying strength can be adapted to, more wide in range to specimen size requirement, test specimen effect of end surface in Failure under Uniaxial Compression can be eliminated and also can realize the bearing plate of test specimen end face perpendicular stress.
Summary of the invention
the stress caused to overcome the uniaxial compression that exists in prior art is concentrated, thus cause the uneven distribution situation of end stress, and then disturb the accuracy of rock sample mechanics parameter output, and the deficiency of interference to acoustic emission, the invention provides a kind of strong adaptability, technique effect is good, rock or the coal body of varying strength can be adapted to, more wide in range to specimen size requirement, eliminate test specimen effect of end surface in Failure under Uniaxial Compression, and the bearing plate of a kind of Real-time Collection coal and rock end face each point perpendicular stress of test specimen end face perpendicular stress can be realized.
the present invention solves the technical scheme that its technical matters takes: a kind of bearing plate of Real-time Collection coal and rock end face each point perpendicular stress, mainly comprise bolster stake, carrier bar, vertical strain sheet, horizontal strain sheet, wire and base, bolster stake is positioned at positive middle part, bolster stake outer cover has multiple carrier bar, and the central axes of bolster stake and carrier bar, the number of carrier bar can the corresponding increase and decrease according to the size of measured rock sample, compensation space is had between adjacent carrier bar, to adapt to the transversely deforming of sample end face in compression process, the middle and lower part of bolster stake and carrier bar has circumferential groove, horizontal strain sheet and vertical strain sheet is distributed with in the circumferential groove of bolster stake and carrier bar, horizontal strain sheet and vertical strain sheet distribute all in pairs, and can installing/dismounting, be convenient to change, to ensure the validity of each foil gauge, foil gauge is all connected with wire, data can be spread out of, the side, bottom of carrier bar offers hub slot, for the wire of concentrated output, carrier bar have horizontal grooving bottom, hub slot and horizontal grooving are on same perpendicular line, mutually can coincide and wire exported, the bottom of bolster stake and carrier bar is provided with base, the end face diameter of described bolster stake is 0.5 ~ 3 cm, be highly 10 ~ 15 cm, the quantity of described carrier bar is 6 ~ 10, the hoop end surface thickness of carrier bar is 0.7 ~ 1.5 cm, be highly 10 ~ 15 cm, the width in described compensation space is 2 ~ 4 mm, and the diameter of described base is 14 ~ 24 cm, is highly 1 ~ 2 cm, the circumferential groove degree of depth that described bolster stake and the outer wall of carrier bar are offered is 2 mm, in order to arrange full-bridge strain acquisition system, described vertical strain sheet and horizontal strain sheet is equally spaced is distributed in circumferential groove, and foil gauge is all connected with wire, data are spread out of, the fluting height of described circumferential groove is 2 ~ 3 cm, the groove width of hub slot and be highly respectively 5 mm and 1 ~ 1.5 cm, the length of horizontal grooving and be highly respectively 2 ~ 4 cm and 0.5 ~ 1 cm, wire is connected in turn on static resistance strain acquisition system according to the label of each carrier bar.
beneficial effect of the present invention: compared with the closed bearing plate adopted in testing with traditional uniaxial compression, the bearing plate of a kind of Real-time Collection coal and rock end face each point perpendicular stress that the present invention proposes has many advantages: first, the bearing plate that the present invention proposes avoids effect of end surface, the end face frictional resistance effect be subject in conventional rock sample pressurized process is eliminated, owing to compensating the compensating action of space to transverse strain between each carrier bar, on sample, the transversely deforming of each position is incited somebody to action no longer in bond and becomes comparatively free; Second, in rock sample pressurized process, the perpendicular stress of each position of end face can effectively be gathered, end face perpendicular stress cloud charts also can be drawn out based on this, this can not realize in the experiment of traditional uniaxial compression, and the drafting of this end face perpendicular stress has very important guiding significance for the stress studies of the various coal column left in colliery scene or filled wall bodies of gob-side retained entries; 3rd, owing to eliminating the frictional resistance effect of end face, in rock test, make high-precise synchronization gather acoustic emission signal be achieved, especially sprouting in initial crack, extension phase, although each carrier bar is set up independently of one another at space cloth, but coordinated with each other in the transversely deforming of adaptation rock sample, effectively prevent the interference acoustic emission signal caused due to end-face friction.
in general, the bearing plate strong adaptability of a kind of Real-time Collection coal and rock end face each point perpendicular stress that the present invention proposes, technique effect are good, rock or the coal body of varying strength can be adapted to, more wide in range to specimen size requirement, it can be standard cylindrical sample, also can be cuboid sample, eliminate test specimen effect of end surface in Failure under Uniaxial Compression, and test specimen end face perpendicular stress can be realized, one rock mechanics testing scheme more accurately can be provided, thus for field engineering practice make directiveness evaluate.
Accompanying drawing explanation
fig. 1 is longitudinal profile of the present invention schematic diagram;
1. bolster stakes, 2. carrier bar in figure, 3. compensate space, 4. vertical strain sheet, 5. circumferential groove, 6. horizontal strain sheet, 7. hub slot, 8. wire, 9. horizontal grooving, 10. base.
Embodiment
below in conjunction with accompanying drawing, the present invention is further illustrated: a kind of bearing plate of Real-time Collection coal and rock end face each point perpendicular stress, mainly comprise bolster stake 1, carrier bar 2, vertical strain sheet 4, horizontal strain sheet 6, wire 8 and base 10, bolster stake 1 is positioned at positive middle part, bolster stake 1 outer cover has multiple carrier bar 2, and the central axes of bolster stake 1 and carrier bar 2, the number of carrier bar 2 can the corresponding increase and decrease according to the size of measured rock sample, have between adjacent carrier bar 2 and compensate space 3, to adapt to the transversely deforming of sample end face in compression process, the middle and lower part of bolster stake 1 and carrier bar 2 has circumferential groove 5, horizontal strain sheet 6 and vertical strain sheet 4 is distributed with in the circumferential groove 5 of bolster stake 1 and carrier bar 2, horizontal strain sheet 6 and vertical strain sheet 4 distribute all in pairs, and can installing/dismounting, be convenient to change, to ensure the validity of each foil gauge, foil gauge is all connected with wire 8, data can be spread out of, the side, bottom of carrier bar 2 offers hub slot 7, for the wire 8 of concentrated output, carrier bar 2 have horizontal grooving 9 bottom, hub slot 7 and horizontal grooving 9 are on same perpendicular line, mutually can coincide and wire 8 exported, the bottom of bolster stake 1 and carrier bar 2 is provided with base 10,
the end face diameter of described bolster stake 1 is 0.5 ~ 3 cm, be highly 10 ~ 15 cm, the quantity of described carrier bar 2 is 6 ~ 10, the hoop end surface thickness of carrier bar 2 is 0.7 ~ 1.5 cm, be highly 10 ~ 15 cm, the width in described compensation space 3 is 2 ~ 4 mm, and the diameter of described base 10 is 14 ~ 24 cm, is highly 1 ~ 2 cm;
circumferential groove 5 degree of depth that described bolster stake 1 and the outer wall of carrier bar 2 are offered is 2 mm, in order to arrange full-bridge strain acquisition system, described vertical strain sheet 4 and horizontal strain sheet 6 is equally spaced is distributed in circumferential groove 5, and foil gauge is all connected with wire 8, data are spread out of, the fluting height of described circumferential groove 5 is 2 ~ 3 cm, the groove width of hub slot 7 and be highly respectively 5 mm and 1 ~ 1.5 cm, the length of horizontal grooving 9 and be highly respectively 2 ~ 4 cm and 0.5 ~ 1 cm;
wire 8 is connected in turn on static resistance strain acquisition system according to the label of each carrier bar 2.
using method: be placed on the original bearing plate of servo testing machine by completing the bearing plate after line, then places one piece of aluminum sheet and is spilled into the chip after preventing sample from crushing and compensates in space 3 on the bearing plate upper surface that the present invention proposes; Place on bearing plate that rock sample proposes in the present invention, while to smear vaseline and stearic acid mixture (mass ratio 1:1) in rock sample upper surface to eliminate the frictional resistance effect on sample upper surface and testing machine between pressure-bearing you face; The data that the data collected for static resistance strain acquisition system and servo testing machine disposal system collect carry out correction analysis, mainly in order to eliminate the vertical strain interference of bearing plate of the present invention.The end face perpendicular stress at arbitrary place of rock sample end face is equal to the stress on the carrier bar 2 that contacts with this place, that is:
σ=
e
0
ε
0
, wherein
e
0
for the elastic modulus of bearing plate of the present invention,
ε
0
drawn by strain acquisition system.But the strain of rock sample is not then equal to the strain that servo testing machine disposal system collects, the change in displacement that servo testing machine detects is made up of two parts, first from rock sample, second is the change in displacement collected from foil gauge on bearing plate of the present invention, then the strain example of rock sample is:
(wherein
hfor the change in displacement that servo testing machine detects,
h
0
for the height of bolster stake 1 or carrier bar 2,
hheight for rock sample).
Claims (4)
1.
a kind of bearing plate of Real-time Collection coal and rock end face each point perpendicular stress, mainly comprise bolster stake (1), carrier bar (2), vertical strain sheet (4), horizontal strain sheet (6), wire (8) and base (10), it is characterized in that bolster stake (1) is positioned at positive middle part, bolster stake (1) outer cover has multiple carrier bar (2), and the central axes of bolster stake (1) and carrier bar (2), the number of carrier bar (2) can the corresponding increase and decrease according to the size of measured rock sample, compensation space (3) is had between adjacent carrier bar (2), the middle and lower part of bolster stake (1) and carrier bar (2) has circumferential groove (5), horizontal strain sheet (6) and vertical strain sheet (4) is distributed with in the circumferential groove (5) of bolster stake (1) and carrier bar (2), horizontal strain sheet (6) and vertical strain sheet (4) distribute all in pairs, foil gauge is all connected with wire (8), the side, bottom of carrier bar (2) offers hub slot (7), carrier bar (2) have horizontal grooving (9) bottom, hub slot (7) and horizontal grooving (9) are on same perpendicular line, mutually can coincide and wire (8) exported, the bottom of bolster stake (1) and carrier bar (2) is provided with base (10).
2.
the bearing plate of a kind of Real-time Collection coal and rock end face each point perpendicular stress according to claim 1, the end face diameter that its feature also comprises described bolster stake (1) is 0.5 ~ 3 cm, be highly 10 ~ 15 cm, the quantity of described carrier bar (2) is 6 ~ 10, the hoop end surface thickness of carrier bar (2) is 0.7 ~ 1.5 cm, be highly 10 ~ 15 cm, the width in described compensation space (3) is 2 ~ 4 mm, the diameter of described base (10) is 14 ~ 24 cm, is highly 1 ~ 2 cm.
3.
the bearing plate of a kind of Real-time Collection coal and rock end face each point perpendicular stress according to claim 1 and 2, it is 2 mm that its feature also comprises circumferential groove (5) degree of depth that the outer wall of described bolster stake (1) and carrier bar (2) is offered, in order to arrange full-bridge strain acquisition system, described vertical strain sheet (4) and horizontal strain sheet (6) is equally spaced is distributed in circumferential groove (5), and foil gauge is all connected with wire (8), data are spread out of, the fluting height of described circumferential groove (5) is 2 ~ 3 cm, the groove width of hub slot (7) and be highly respectively 5 mm and 1 ~ 1.5 cm, the length of horizontal grooving (9) and be highly respectively 2 ~ 4 cm and 0.5 ~ 1 cm.
4.
the bearing plate of a kind of Real-time Collection coal and rock end face each point perpendicular stress according to claim 1 or 3, its feature also comprises described wire (8) and is connected in turn on static resistance strain acquisition system according to the label of each carrier bar (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510346615.4A CN104897322B (en) | 2015-06-23 | 2015-06-23 | A kind of bearing plate of the end face of collection coal and rock in real time each point vertical stress |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510346615.4A CN104897322B (en) | 2015-06-23 | 2015-06-23 | A kind of bearing plate of the end face of collection coal and rock in real time each point vertical stress |
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| Publication Number | Publication Date |
|---|---|
| CN104897322A true CN104897322A (en) | 2015-09-09 |
| CN104897322B CN104897322B (en) | 2017-11-14 |
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| CN201510346615.4A Expired - Fee Related CN104897322B (en) | 2015-06-23 | 2015-06-23 | A kind of bearing plate of the end face of collection coal and rock in real time each point vertical stress |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109870356A (en) * | 2019-01-28 | 2019-06-11 | 北京理工大学 | Multi-channel wide should broaden the propellant compression stress test device of temperature range high security |
| CN116296820A (en) * | 2023-03-31 | 2023-06-23 | 四川大学 | Iterative method for determining rock elasticity parameter and cracking stress by bidirectional approximation and product |
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| US4081993A (en) * | 1976-04-28 | 1978-04-04 | Bergwerksverband Gmbh | Device for measuring the magnitude and direction of compression forces |
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| CN101135619A (en) * | 2007-07-13 | 2008-03-05 | 东南大学 | Asphalt concrete elevated temperature property testing method |
| CN103900902A (en) * | 2014-04-16 | 2014-07-02 | 西南科技大学 | Laterally constrained rock uniaxial compression test device |
| CN103983516A (en) * | 2014-06-10 | 2014-08-13 | 山东大学 | Device and method for measuring and calculating poisson ratio of soil body |
| CN104483199A (en) * | 2014-11-19 | 2015-04-01 | 黄河勘测规划设计有限公司 | Field rock mass poisson ratio test method |
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2015
- 2015-06-23 CN CN201510346615.4A patent/CN104897322B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4081993A (en) * | 1976-04-28 | 1978-04-04 | Bergwerksverband Gmbh | Device for measuring the magnitude and direction of compression forces |
| US4444058A (en) * | 1982-05-28 | 1984-04-24 | The United States Of America As Represented By The United States Department Of Energy | Method and apparatus for determining tensile strength |
| CN101135619A (en) * | 2007-07-13 | 2008-03-05 | 东南大学 | Asphalt concrete elevated temperature property testing method |
| CN103900902A (en) * | 2014-04-16 | 2014-07-02 | 西南科技大学 | Laterally constrained rock uniaxial compression test device |
| CN103983516A (en) * | 2014-06-10 | 2014-08-13 | 山东大学 | Device and method for measuring and calculating poisson ratio of soil body |
| CN104483199A (en) * | 2014-11-19 | 2015-04-01 | 黄河勘测规划设计有限公司 | Field rock mass poisson ratio test method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109870356A (en) * | 2019-01-28 | 2019-06-11 | 北京理工大学 | Multi-channel wide should broaden the propellant compression stress test device of temperature range high security |
| CN116296820A (en) * | 2023-03-31 | 2023-06-23 | 四川大学 | Iterative method for determining rock elasticity parameter and cracking stress by bidirectional approximation and product |
| CN116296820B (en) * | 2023-03-31 | 2024-04-05 | 四川大学 | Iterative method for determining rock elasticity parameter and cracking stress by bidirectional approximation and product |
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| CN104897322B (en) | 2017-11-14 |
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