CN103743634B - Fluid structure interaction coal rock shear-seepage test fluid pressure-loaded shear box - Google Patents
Fluid structure interaction coal rock shear-seepage test fluid pressure-loaded shear box Download PDFInfo
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- CN103743634B CN103743634B CN201410036420.5A CN201410036420A CN103743634B CN 103743634 B CN103743634 B CN 103743634B CN 201410036420 A CN201410036420 A CN 201410036420A CN 103743634 B CN103743634 B CN 103743634B
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Abstract
The invention discloses a kind of fluid structure interaction coal rock shear-seepage test fluid pressure-loaded shear box, comprise the upper cartridge body and lower box body that are fixed to one another connection; Upper cartridge body and lower box body are provided with the cavity holding test specimen; Upper cartridge body is fixedly connected with upper cover; Lower box body is fixedly connected with lower cover; Lower cover is fixedly connected with backing plate; Depression bar is combined with in upper cover; Depression bar is connected with test specimen pressure head near the end thread of test specimen; Test specimen pressure head is combined with test specimen joint near the end thread of test specimen; Lower box body is provided with the first O-ring seal towards the end face of upper cartridge body; Lower box body is provided with fluid circuit in the inner side of the first O-ring seal; Lower box body is respectively arranged with the second fluid joint and the 3rd fluid coupling that communicate with fluid circuit in the left and right sides.The present invention can simulate actual condition more really, improves test accuracy.
Description
Technical field
The present invention relates to a kind of test unit, particularly relating to a kind of shear box shearing seepage tests for testing coal petrography.
Background technology
In Mine Production, mining operation destroys the balance of initial rock stress field and the balance of original gas pressure, defines stress redistribution and the Gas Flow of digging surrounding rock body.Coal-bed gas (coal-seam gas) permeability is the physical parameter of gas porous flow complexity in reflection coal seam, is also the important parameter of gas porous flow mechanics and engineering.Therefore, the research of the measuring method of coal-bed gas permeability or Gas Permeation Coefficients of Coal Seams is the gordian technique of gas porous flow Mechanics Development, and the key that the person that is also Safety Work in Colliery studies a series of mine safety problem such as coal and gas prominent, gas explosion is started with a little.
The defects such as the hole existed in rock mass and crack not only change the mechanical property (deformation modulus and intensive parameter reduce, rock mass be anisotropy) of rock mass greatly, and drastically influence the Penetration Signature of rock mass.The seepage field of crack rock is subject to the impact of ambient stress, and the change of seepage field has an impact in the corresponding field of force conversely, and this influencing each other is referred to as seepage liquefaction.It is a key property in rock mass mechanics that seepage field and stress field intercouple.
Shear box, as the vitals of shear test, plays crucial effect to test accuracy.But in prior art, shear box inflation or water-filling pressure too small, be difficult to real simulation operating mode present situation, and when shearing between upper and lower box body for static friction, therefore will produce larger test error.
Therefore those skilled in the art are devoted to develop the higher fluid structure interaction coal rock shear-seepage test fluid pressure-loaded shear box of a kind of test accuracy.
Summary of the invention
Because the above-mentioned defect of prior art, technical matters to be solved by this invention is to provide the higher fluid structure interaction coal rock shear-seepage test fluid pressure-loaded shear box of a kind of test accuracy.
For achieving the above object, the invention provides a kind of fluid structure interaction coal rock shear-seepage test fluid pressure-loaded shear box, comprise the upper cartridge body and lower box body that are fixed to one another connection; Described upper cartridge body and lower box body are provided with the cavity holding test specimen;
Described upper cartridge body is fixedly connected with upper cover; Described lower box body is fixedly connected with lower cover; Described lower cover is fixedly connected with backing plate;
Depression bar is combined with in described upper cover; Described depression bar is connected with test specimen pressure head near the end thread of test specimen; Described test specimen pressure head is combined with test specimen joint near the end thread of test specimen;
Described depression bar is provided with first-class body opening radially and second body opening vertically; The entrance of described first-class body opening is provided with first fluid joint; Described first-class body opening and second body opening end to end;
Throughly on test specimen pressure head and test specimen joint be provided with three fluid bore concentric with described second body opening and the 4th fluid bore;
Described lower box body is provided with the first O-ring seal towards the end face of upper cartridge body; Described lower box body is provided with fluid circuit in the inner side of the first O-ring seal; Described lower box body is respectively arranged with the second fluid joint and the 3rd fluid coupling that communicate with described fluid circuit in the left and right sides.
Before and after described upper cartridge body, both sides are respectively arranged with the first flange and the second flange; Before and after described lower box body, both sides are respectively arranged with the 3rd flange and the 4th flange;
Described upper cartridge body is respectively arranged with in the both sides of described first flange and the second flange the second raceway and the 3rd raceway that are made up of some second rollers and the 3rd roller; Described second raceway and the 3rd raceway are provided with clamping plate;
Described lower box body is respectively arranged with in the inner side of described 3rd flange and the 4th flange the 4th raceway and the 5th raceway that are made up of some 4th rollers and the 5th roller;
On described lower box body, rectangular distribution has four threaded holes; The corresponding described threaded hole place of described upper cartridge body is provided with waist through hole;
Bolt coordinates with described threaded hole through after described clamping plate and waist through hole.
The second O-ring seal is provided with between described upper cartridge body and described upper cover; The 3rd O-ring seal is provided with between described lower box body and described lower cover;
The 4th O-ring seal is provided with between described depression bar lower surface and test specimen pressure head; The 5th O-ring seal is provided with between described test specimen pressure head and the upper surface of test specimen joint; The test specimen inserting end of described test specimen joint is provided with at least one the 6th O-ring seal.
The invention has the beneficial effects as follows:
1, the present invention directly inflates or water-filling coal rock specimen inside, simulates actual condition more really, thus improves test accuracy;
2, static friction during detrusion is become kinetic friction, thus be more conducive to data acquisition and accurate Calculation; Meanwhile, this structure combines with the annular seal up and down between shear box, to the larger gas of injection pressure in test specimen or water, thus can reflect actual condition more really, improve test accuracy.
Accompanying drawing explanation
Fig. 1 is the structural representation of shear box in the embodiment of the invention.
Fig. 2 is the A-A sectional structure schematic diagram of Fig. 1.
Fig. 3 is the B-B sectional structure schematic diagram of Fig. 1.
Fig. 4 is the left TV structure schematic diagram of Fig. 3.
Fig. 5 is the structural representation of the pilot system that the embodiment of the invention is applied.
Fig. 6 is the left TV structure schematic diagram of Fig. 5.
Fig. 7 is the partial enlarged drawing at I place in Fig. 5.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figures 1 to 4, a kind of fluid structure interaction coal rock shear-seepage test fluid pressure-loaded shear box, comprises the upper cartridge body 13 and lower box body 14 that are fixed to one another connection, and upper cartridge body 13 and lower box body 14 are provided with the cavity holding test specimen.
Upper cartridge body 13 is fixedly connected with upper cover 15, and lower box body 14 is fixedly connected with lower cover 16, and lower cover 16 is fixedly connected with backing plate 17.
Be combined with depression bar 18 in upper cover 15, depression bar 18 is connected with test specimen pressure head 19 near the end thread of test specimen, and test specimen pressure head 19 is combined with test specimen joint 20 near the end thread of test specimen.
Depression bar 18 is provided with first-class body opening 22a radially and second body opening 22b vertically, the entrance of first-class body opening 22a is provided with first fluid joint 21a, and first-class body opening 22a and second body opening 22b is end to end.
Throughly on test specimen pressure head 19 and test specimen joint 20 be provided with the three fluid bore 22c concentric with second body opening 22b and the 4th fluid bore 22d.
Lower box body 14 is provided with the first O-ring seal 23a towards the end face of upper cartridge body 13, lower box body 14 is provided with fluid circuit 24 in the inner side of the first O-ring seal 23a, and lower box body 14 is respectively arranged with the second fluid joint 21b and the 3rd fluid coupling 21c that communicate with fluid circuit in the left and right sides.
Before and after upper cartridge body 13, both sides are respectively arranged with the first flange 13a and the second flange 13b, and before and after lower box body 14, both sides are respectively arranged with the 3rd flange 14a and the 4th flange 14b.
Upper cartridge body 13 is respectively arranged with the second raceway and the 3rd raceway that are made up of some second roller 9b and the 3rd roller 9c in the both sides of the first flange 13a and the second flange 13b; Second raceway and the 3rd raceway are provided with clamping plate 25.
Lower box body 14 is respectively arranged with the 4th raceway and the 5th raceway that are made up of some 4th roller 9d and the 5th roller 9e in the inner side of the 3rd flange 14a and the 4th flange 14b.
On lower box body 14, rectangular distribution has four threaded hole 14c, and upper cartridge body 13 corresponding threaded hole 14c place is provided with waist through hole 13c.
Bolt 26 coordinates with threaded hole 14c through after clamping plate 25 and waist through hole 13c.
Be provided with the second O-ring seal 23b between upper cartridge body 13 and upper cover 15, between lower box body 14 and lower cover 16, be provided with the 3rd O-ring seal 23c.
Be provided with the 4th O-ring seal 23d between depression bar 18 lower surface and test specimen pressure head 19, between the upper surface of test specimen pressure head 19 and test specimen joint 20, be provided with the 5th O-ring seal 23e, the test specimen inserting end of test specimen joint 20 is provided with the 6th O-ring seal 23f.
Above-mentioned shear box can be applied to charger and carry out shear test.Charger comprises frame 1, and the top of frame 1 arranges vertical hydraulic cylinder 2, vertical hydraulic cylinder 2 is provided with vertical pressure head 2a, and the side of frame 1 is provided with horizontal hydraulic cylinder 3, horizontal hydraulic cylinder 3 is provided with horizontal pressure head 4.
The middle part of frame 1 is fixed with track installation frame 5, the left and right sides of track installation frame 5 is fixed with the first guide rail 6a and the second guide rail 6b respectively, first guide rail 6a and the second guide rail 6b is combined with roller 7 respectively, and each roller 7 is connected with Mobile base 8, and shear box can be placed on Mobile base 8.
Mobile base 8 is provided with the first raceway be made up of some first roller 9a, frame 1 has adjuster bar 10 in the opposite threaded engagement of horizontal pressure head 4, and the outside of the relative frame 1 of adjuster bar 10 is connected with handwheel 11, and inner side is fixed with and regulates pressure head 12.
Utilize above device, can test according to following steps:
(1) test material preparation.
Raw coal: the original coal cinder plastic sheeting good seal fetched from scene is placed in wooden case, then water with thin orthopaedics aggregate concrete, to fill up the gap between coal cinder and wooden case, carry out getting core with corning machine again after concrete hardening completely, finally utilize grinding machine that the coal core careful of taking-up is polished into 100mm × 100mm × 100mm raw coal cube coal sample, and it is placed in drying in oven, then deposit with drying box;
Moulded coal: got original coal cinder comminutor is pulverized, coal particle size is selected to be pulverized coal particle between 40 ~ 80 orders by Vibration Screen, then in these coal dusts screened, add a small amount of pure water and be evenly placed on the coal sample being pressed into 100mm × 100mm × 100mm in mould on 200t stiff experiment machine with the pressure of 100MPa, being positioned in drying box after finally the moulded coal coal sample prepared being dried.
(2) test specimen is installed and installation.
The Mobile base 8 being placed with shear box lower box body is released from frame 1, by boom hoisting (not shown), vertical pressure head 2a, upper cartridge body 13 is sling, test specimen 1/2nd is placed in the middle part of lower box body.Check that on lower box body, whether O-ring seal is arranged in groove, then aims at test specimen by upper cartridge body and puts down, tightened by fixed head; Depression bar 18 is aimed at upper cartridge body to install, by screw tightening; By in Mobile base 8 propelling frame 1, shear box is made to enter predetermined test station; Gas inlet pipe and first fluid joint 21a are connected, gas escape pipe and flowmeter are connected; Check whether each system normally works.
(3) vacuumize.
Checking experiment container air-tightness, closes air intake opening stop valve, opens gas outlet stop valve, is vacuumized by external exhaust port, continues two hours; Close vacuum pump, close outlet shutoff valve.
(4) gas adsorption.
After degassed, close three-way valve, regulate high pressure methane steel cylinder to give vent to anger valve, apply predetermined gas pressure, to test interacvity air-filling, inflationtime is generally 12h, makes the abundant adsorption equilibrium of coal sample gas.
(5) test.
Open gas outlet stop valve; Opening pressure testing machine and each measuring system, carry out the parameter such as load mode, gas pressure according to the testing program formulated.By pressure testing machine system log (SYSLOG) shear stress and shear displacemant; In observed data acquisition system, gas outlet pressure changes rule over time, and dynamic measures following parameter: shear stress, shear displacemant, gas flow etc.
(6) experiment stops.
Turn off gas gas cylinder reduction valve, lay down tangential force, finally lay down normal stress, after having unloaded, turn off and shear osmotic system oil pump.
(7) data store.
Preserve all data of data acquisition system (DAS) record; Be separated upper cartridge body and lower box body, take out test specimen, observe test specimen form; And clear up foul in Bottom of box body.
Can repeat (2)-(6) step tests next time.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of 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 (3)
1. a fluid structure interaction coal rock shear-seepage test fluid pressure-loaded shear box, comprises the upper cartridge body (13) and lower box body (14) that are fixed to one another connection; Described upper cartridge body (13) and lower box body (14) are provided with the cavity holding test specimen;
It is characterized in that: described upper cartridge body (13) is fixedly connected with upper cover (15); Described lower box body (14) is fixedly connected with lower cover (16); Described lower cover (16) is fixedly connected with backing plate (17);
Depression bar (18) is combined with in described upper cover (15); Described depression bar (18) is connected with test specimen pressure head (19) near the end thread of test specimen; Described test specimen pressure head (19) is combined with test specimen joint (20) near the end thread of test specimen;
Described depression bar (18) is provided with first-class body opening (22a) radially and second body opening (22b) vertically; The entrance of described first-class body opening (22a) is provided with first fluid joint (21a); Described first-class body opening (22a) and second body opening (22b) end to end;
Throughly respectively on test specimen pressure head (19) and test specimen joint (20) be provided with three fluid bore (22c) concentric with described second body opening (22b) and the 4th fluid bore (22d);
Described lower box body (14) is provided with the first O-ring seal (23a) towards the end face of upper cartridge body (13); Described lower box body (14) is provided with fluid circuit (24) in the inner side of the first O-ring seal (23a); Described lower box body (14) is respectively arranged with the second fluid joint (21b) and the 3rd fluid coupling (21c) that communicate with described fluid circuit in the left and right sides.
2. fluid structure interaction coal rock shear-seepage test fluid pressure-loaded shear box as claimed in claim 1, is characterized in that:
Before and after described upper cartridge body (13), both sides are respectively arranged with the first flange (13a) and the second flange (13b); Before and after described lower box body (14), both sides are respectively arranged with the 3rd flange (14a) and the 4th flange (14b);
Described upper cartridge body (13) is respectively arranged with in the both sides of described first flange (13a) and the second flange (13b) the second raceway and the 3rd raceway that are made up of some second rollers (9b) and some 3rd rollers (9c); Described second raceway and the 3rd raceway are provided with clamping plate (25);
Described lower box body (14) is respectively arranged with in the inner side of described 3rd flange (14a) and the 4th flange (14b) the 4th raceway and the 5th raceway that are made up of some 4th rollers (9d) and some 5th rollers (9e);
The upper rectangular distribution of described lower box body (14) has four threaded holes (14c); Described upper cartridge body (13) corresponding described threaded hole (14c) place is provided with waist through hole (13c);
Bolt (26) coordinates with described threaded hole (14c) afterwards through described clamping plate (25) and waist through hole (13c).
3. fluid structure interaction coal rock shear-seepage test fluid pressure-loaded shear box as claimed in claim 1 or 2, is characterized in that: be provided with the second O-ring seal (23b) between described upper cartridge body (13) and described upper cover (15); The 3rd O-ring seal (23c) is provided with between described lower box body (14) and described lower cover (16);
The 4th O-ring seal (23d) is provided with between described depression bar (18) lower surface and test specimen pressure head (19); The 5th O-ring seal (23e) is provided with between described test specimen pressure head (19) and the upper surface of test specimen joint (20); The test specimen inserting end of described test specimen joint (20) is provided with at least one the 6th O-ring seal (23f).
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Cited By (1)
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| CN106124343A (en) * | 2016-08-25 | 2016-11-16 | 绍兴文理学院 | The pilot system of THMC coupling during consideration rock joint shear |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124343A (en) * | 2016-08-25 | 2016-11-16 | 绍兴文理学院 | The pilot system of THMC coupling during consideration rock joint shear |
| CN106124343B (en) * | 2016-08-25 | 2019-04-05 | 绍兴文理学院 | The pilot system of THMC coupling during consideration rock joint shear |
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