CN208109568U - Rock direct shear test test specimen, piece fixture and presser unit - Google Patents
Rock direct shear test test specimen, piece fixture and presser unit Download PDFInfo
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- CN208109568U CN208109568U CN201820513607.3U CN201820513607U CN208109568U CN 208109568 U CN208109568 U CN 208109568U CN 201820513607 U CN201820513607 U CN 201820513607U CN 208109568 U CN208109568 U CN 208109568U
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Abstract
Rock direct shear test test specimen, piece fixture and presser unit, belong to rock mechanics the field of test technology.The test specimen can be directly used for three-axis tester, including cuboid ontology, left part is provided with the first grooving on the downside of ontology, first grooving extends to body interior in the horizontal direction from avris, it further include the second grooving, first grooving and the second grooving are centrosymmetric distribution centered on body central, and grooving length is identical as avris length of cuboid ontology where it, and notch width is no longer than the half of bottom surface side length.It is simple and light, the direct shear test of rock can be carried out in the three-axis force experimental machine that can only be compressed, abundant three-axis force experimental machine experimental use, the confining pressure load provided by confining pressure oil sources provides surface of test piece compression, distribution of the compressive stress is more more uniform than the axial load load that traditional direct shear test is selected, improve Uniformity of Stress, and can subsequent developments High temperature rocks direct shear test, be suitable for development the research of rock direct shear test.
Description
Technical field
The utility model belongs to rock mechanics the field of test technology, is related to a kind of rock that can be used in ordinary triaxial test machine
The presser unit that stone direct shear test test specimen, piece fixture, rock shearing are tested.
Background technique
Failure by shear is the breakoff phenomenon for making shear surface two sides rock mass that the changing of the relative positions or expansion etc. occur as caused by shear stress, is
One of the major way of the main unstable failure of engineering rock mass.Under shear loads, the maximum that rock resists failure by shear is cut
Stress is known as the shearing strength of rock.The shearing strength of rock represents the ability that rock resists failure by shear and sliding, therefore
The shearing strength of study of rocks has great research significance.The method of study of rocks shearing strength is divided into indoor and scene at present
Two major classes test, wherein laboratory test generallys use the measurement rock such as direct shear test, wedge shape shearing test, triaxial shear test
The shearing strength of stone, and field test is mainly based on direct shear test.
Traditional rock direct shear test mainly uses flat stacking to carry out.Used test apparatus is direct shearing
Instrument is mainly made of upper and lower two rigid cases.The size of test specimen planar is defined as 150cm*15cm~30cm*
30cm, and the thickness of rock respectively may be about 1/2 of cross dimensions or so above and below regulation shear surface, be generally available 5cm*5cm size
's.It when preparing test specimen, needs to be cut into groove-like along test specimen surrounding, the test specimen prepared is put into boxshear apparatus
Between upper and lower casket, the changing of the relative positions face of upper and lower casket is exactly the shear surface of rock.Direct shear test is by test specimen in selected plane
Inside sheared.Every time when test, first apply vertical load P on test specimen, then gradually application level is cut in the horizontal direction
Shear force T is destroyed when until reaching maximum of T max, to calculate the shear strength of rock sample.Traditional rock is straight
It is simple to connect shearing test step, it is easily operated, subsidiary is carried out without other special installations, in addition to rock entirety can be measured
Outside shearing strength and weak structural face intensity, the shear strength between different rocks can also be measured.However, traditional direct shearing
Test method, which needs to have, can provide the specific shearing equipment of both direction loading force, and cost is high, have a single function.Wedge shape shearing is surveyed
Examination technology can also realize that rock shear strength is tested, but when the use test method, surface of test piece positive pressure and tangential thrust
Equal proportion increases, and can not obtain the rock shearing destruction (i.e. shearing stress-displacement curve of sample) under some positive pressure.
Triaxial pressure machine is the basic test equipment for testing rock failure mechanism of rock behavior and intensity, is made extensively at home at present
With；Test rock shear strength is opened using triaxial pressure machine and failure by shear behavior is very universal, but the prior art is unable to test
Rock shear strength under specific positive pressure can not also obtain the relationship between rock shearing stress and shear displacemant；Especially
For transverse isotropy rock, traditional technology for carrying out rock shear strength test using triaxial pressure machine is difficult to determine standard
True shear breakage can not calculate the cohesive strength and internal friction angle of the rocks, be unfavorable for carrying out transverse isotropy rock
Shear strength test.Further, since triaxial pressure machine can not provide the shearing of direct shear test, therefore, it is difficult to directly existing skill
The test specimen of art is placed on the direct shear test that rock is carried out on traditional three-axis tester.
Therefore, a kind of sillar staight scissors test specimen that can be used in ordinary triaxial test machine, piece fixture, rock shearing examination are needed
The presser unit tested, so as to combine, rock normal triaxial mechanics machine carries out rock shear strength and shearing behavior is surveyed
Examination, and shearing stress-shear displacemant curve is drawn, rock triaxial pressure machine added value is promoted, is increased for rock shearing measuring technology
A kind of new experimental method.In addition, further exploring rock using the device in conjunction with the novel measurement means such as loaded type CT scan
The generation, extension and perforation process of block test specimen macroscopic view and microfissure during staight scissors, and can be enclosed in conjunction with three-axis tester
Pressure oil heating function carries out High temperature rocks direct shear test, provides new way for rock shearing destruction scientific research.
Utility model content
Technical problem to be solved in the utility model is the deficiency in order to fill up existing rock shearing measuring technology, is provided
A kind of rock direct shear test test specimen, piece fixture, rock shearing test presser unit, which can be directly used for conventional three
Shaft experiment carries out direct shear test, takes full advantage of its added value of the functional promotion of traditional experiment machine, and to explore rock shearing
Destruction provides new way.In addition, being tested using the fixture clamping test pieces, can improve in traditional direct shear test
The phenomenon that discontinuity.
Technical solution adopted by the utility model to solve its technical problems is：Rock direct shear test test specimen, the test specimen energy
Enough it is directly used in three-axis tester, including cuboid ontology, left part is provided with the first grooving on the downside of ontology, and the first grooving is from avris
Extend in the horizontal direction to body interior, further includes the second grooving, the first grooving is in centered on body central with the second grooving
Central symmetry distribution, grooving length is identical as the avris length of cuboid ontology where it, and notch width is no longer than bottom surface side length
Half.
Specifically, a height of H of ontology, bottom surface side length is respectively A, B, and H >=A >=B, grooving is with a thickness of D, D < 0.04A.
The utility model solves another technical solution used by its technical problem：Rock direct shear test piece fixture,
Including left semicircle cylindrical component and right semi-circle cylindrical component, two semi-cylindrical components are detachably arranged relatively, left semicircle column
The accommodating cavity for placing rock direct shear test test specimen, the cross section of accommodating cavity are provided between component and right semi-circle cylindrical component
For hexagon, accommodating cavity runs through jig main body bottom surface and top surface.
It further, further include pressure drop reducing structure, pressure drop reducing structure is respectively arranged at test specimen and left semicircle cylindrical component and right half cylinder
Between shape component, material is polytetrafluoroethylene (PTFE).
Specifically, being arranged fluted on the side plane of left semicircle cylindrical component, the side plane of right semi-circle cylindrical component is set
It is equipped with the protrusion to match with groove, is fastened togather left and right semi-cylindrical component by groove and protrusion；Except accommodating cavity portion
Position is outer, and the spacing of left semicircle cylindrical component and right semi-circle cylindrical component is 0.5~2mm, and accommodating cavity position is where accommodating cavity
Position.
Specifically, left semicircle cylindrical component and right semi-circle cylindrical component are formed by cylindrical element ratio lower than test specimen low 1
~2mm.
The utility model solves another technical solution used by its technical problem：The pressure head list of rock shearing test
Member, which is characterized in that including seaming chuck, push-down head and such as above-mentioned rock direct shear test piece fixture, the outer diameter phase one of three
It causes, seaming chuck and push-down head are respectively cylinder component.
Further, stalloy is provided between non-test specimen position and seaming chuck at the top of piece fixture.
Specifically, piece fixture is rigid steel material.
The utility model has the beneficial effects that：Simple and light, compact is convenient for mass production processing and fabricating, energy
Enough direct shear tests for carrying out rock in the three-axis force experimental machine that can only be compressed are enriched the test of three-axis force experimental machine and are used
On the way, the confining pressure load provided by confining pressure oil sources provides surface of test piece compression, and distribution of the compressive stress is selected than traditional direct shear test
The load of axial load it is more uniform, can preferably solve the stress point of test specimen in conventional rock direct shearing test by the face of cutting
The problem of cloth is uneven, and application horizontal force direction precision prescribed is higher, is also easy to produce error.The present invention is suitable for carrying out the examination of rock staight scissors
It tests.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of rock direct shear test test specimen in the present invention；
Fig. 2 is structural schematic diagram when rock direct shear test test specimen is pressurized in the present invention；
Fig. 3 is the left view of rock direct shear test test specimen in the present invention；
Fig. 4 is the main view of rock direct shear test test specimen in the present invention；
Fig. 5 is the structural schematic diagram of rock direct shear test piece fixture in the present invention；
Fig. 6 is the top view of rock direct shear test piece fixture in the present invention；
Fig. 7 is the schematic diagram for carrying out laboratory test in the present invention using rock direct shear test test specimen and fixture；
Wherein, 1 is presser unit, and 2 be cuboid ontology, and 3 be the first grooving, and 4 be the second grooving, and 5 be pressure drop reducing structure, and 6 are
Left semicircle cylindrical component, 7 be right semi-circle cylindrical component, and 8 be seaming chuck, and 9 be push-down head, and 10 be foil gauge, and 11 be fixture.
Specific embodiment
With reference to the accompanying drawing, the technical solution of the utility model is described in detail.
Rock direct shear test test specimen as shown in figures 1-4, can be directly used for three-axis tester, including cuboid ontology
2, the bottom surface of cuboid ontology is rectangle, can be square in special circumstances, and so selection is to guarantee and upper push-down head
It can fit closely.If bottom surface is rectangle, bottom surface side length is respectively A, B, A >=B；Based on each harmony and test specimen to power
Considered using popularity, preferably the cuboid ontology that is square of bottom surface, square side length A, 25mm≤A≤50mm；Ontology is high
Degree is H, H >=A, preferably 25mm≤H≤200mm.
Left part is provided with the first grooving 3 on the downside of ontology, and the first grooving 3 extends to body interior in the horizontal direction from avris,
Extended spot penetrates through ontology, and it further includes the second grooving 4 that the first grooving 3 trend is parallel with the top surface of ontology, the first grooving 3 and the
Two groovings 4 are centrosymmetric distribution centered on body central, the avris length B phase of grooving length and cuboid ontology where it
Together, i.e. grooving length must pass through test specimen, as shown, grooving length be B, notch width, that is, grooving from avris in the horizontal direction
The distance extended to body interior is notch width, and notch width is no longer than the half of bottom surface side length.The value model of grooving thickness D
Enclose for D < 0.04A, wherein it is preferred that D=1~2mm, if grooving setting is blocked up, can during rock staight scissors also by
Other power, influences experimental result；Its width of grooving is preferably A/2, and vertical range of first grooving apart from ground is H1,
0.25H≤H1≤ 0.4H, in order to improve stress equilibrium.Two notch configuration sizes are all identical, are designed in this way and are conducive to make
The effect for obtaining the uniform grooving of shearing that test specimen is subject to is the shearing axle power applied above machine being converted into test specimen, shape
Preferably rectangle, in order to calculate shearing, if other shapes and trend, the axle power that one side machine applies cannot be complete
It is converted into shearing entirely, the shearing size that on the other hand also bad calculating sample receives.Being designed in this way test specimen is in order to which test specimen is straight
The phenomenon that connecing and carry out direct shear test for ordinary triaxial test, improving discontinuity in traditional direct shear test.
The production method of above-mentioned test specimen is：Core or the sillar cutting chosen from scene are machined to omit than required size
The cuboid ontology of big test specimen is pressed the upper and lower end faces of cuboid ontology with grinding machine《Standard for test methods of engineering rock masses》In
Rock compressed experiment test specimen end face requirement on machining accuracy processed, the folder in two faces of test specimen arbitrary neighborhood after processing is completed
Angular region should be controlled at 90 ° ± 0.5 °, and the size of ontology any position should enough uniformly, and ontology deviation is no more than 0.2mm；So
It is cut into grooving in the two sides of test specimen with skive afterwards, grooving surface gradually polishes, and ultimately forms the examination that the present invention needs
Part.Specifically, by bottom surface side length be respectively A, B by the test specimen, the cuboid ontology processing of a height of H, in cuboid sheet
H at the top of distance on the left of body1The first grooving that place's setting one is D through test specimen inner thickness, the first grooving trend are parallel to top surface,
Length is the half of bottom surface side length, apart from bottom H on the right side of cuboid ontology1The same setting one in place runs through second inside test specimen
Grooving, the length of the second grooving, width and thickness and the first grooving it is identical, entire test specimen forms a centrosymmetric structure.
Traditional direct shear test often will appear in compression is cut face unbalanced stress phenomenon, which applies mainly due to test specimen
Often using point power P as axially loaded when adding vertical load, and due to fixture and pressure during power is loaded as face power
The rigidity of head not enough often generates the phenomenon that unbalanced stress, influences experimental result.And this can be overcome using following fixture
One problem.
As shown in Fig. 5~6, for clamping the fixture of rock direct shear test test specimen, including left semicircle cylindrical component 6 and right half
Cylindrical element 7, two semi-cylindrical components are detachably arranged relatively, if the side plane of left semicircle cylindrical component 6 is equipped with groove,
The side in the side plane of left semicircle cylindrical component 6 i.e. its face being in contact with right semi-circle cylindrical component, right semi-circle cylindrical component is flat
Face is provided with the protrusion to match with groove, is fastened togather left and right semi-cylindrical component by groove and protrusion, furthermore
It can be opened using other and unload fixed form and be detachably connected left semicircle cylindrical component 6 and right semi-circle cylindrical component 7.Left semicircle
The accommodating cavity for placing rock direct shear test test specimen, the cross of accommodating cavity are provided between cylindrical component and right semi-circle cylindrical component
Section is hexagon, and accommodating cavity runs through jig main body bottom surface and top surface.In order to improve uniform force, advantageous cross sections are positive
Hexagon.Why it is designed as hexagon, is because the face of left and right two for the hexagonal prisms that hexagon is formed can be with test specimen or so
Two faces fit closely, and in this way when three-axis tester applies confining pressure, what can be fitted closely by the two faces examination
Part applies uniform axle power, and remaining four faces intermediate can have some gaps, inside loads onto foil gauge measurement sample and is loading
Change in displacement situation in the process.If foil gauge (strain can be expressed to during confining pressure compresses using square
Piece is not compression member, had better not be under pressure)；If using rectangle, in free face during applying confining pressure
Centre can generate bending moment, and stress is with regard to uneven；If, can not be to application pressure at left and right sides of test specimen using round.Except accommodating
Cavity portion position is outer, and the spacing of left semicircle cylindrical component and right semi-circle cylindrical component is 0.5~2mm, and accommodating cavity position is accommodating cavity institute
Position, in addition it is also possible to be not provided with spacing at engagement site, position that engagement site is engaged by groove and protrusion.
Because left and right semi-cylindrical component will receive the power of confining pressure and further lean on to centre when three-axis tester applies confining pressure
Hold together, be arranged certain spacing when can be to avoid by confining pressure between two semi-cylindrical components without gap cause test specimen by
Pressure it is less than normal, cause experimental error.
Consider service life, and relevant pressure can be carried, and pressure is uniformly applied on test specimen, preferably left half cylinder
Shape component and right semi-circle cylindrical component are rigid steel material, and entire body is constituted using high-strength solid steel.
In addition, fixture 11 further includes the pressure drop reducing structure 5 of two pieces of rectangular-shapes, pressure drop reducing structure is respectively arranged at test specimen 1 and left semicircle
Between cylindrical component 6 and right semi-circle cylindrical component 7, pressure drop reducing structure thickness is not answered blocked up, and size should be slightly bigger than test specimen, to reduce
The frictional force that confining pressure is subject to during application confining pressure.Considered based on low in cost and effect, preferably its material is polytetrafluoroethylene (PTFE).
And in traditional rock direct shear test and pressure drop reducing structure is not used in the prior art.
Illustrate the specific manufacturing process of the fixture with following embodiment, it is as follows：Solid cylinder is cast using steel, cylinder is high
Degree should be slightly below 1~2mm of height of specimen, solid cylinder is cut into two semicircle cylinders along half radial direction, each half is round later
Column is parallel to the thin slice that diametrical direction cuts certain thickness such as 0.5mm, by one of semicircle cylinder in the relatively upper region of top view
And relatively under symmetrically cut a 4mm length strip notch and splice on another semicircle cylinder corresponding position, then exist
The centre of two semicircle cylinders cuts out a hexagonal indentations, which is required to accommodate pressure drop reducing structure and test specimen just.
Similarly, the presser unit tested using following rock shearings can also overcome by the disadvantage for cutting face stress distribution unevenness.
That entire presser unit is placed on to the case where using on three-axis tester as shown in Figure 7, presser unit include seaming chuck 8, under
Pressure head 9 and above-mentioned rock direct shear test piece fixture, the radius of three components is consistent, and radius size is without strict regulations, as long as folder
Tool outer diameter is adapted with triaxial compressions room, it can is entirely enclosed in triaxial compressions room, preferably radius is 120mm.Upper pressure
Head is a cylindrical element, and shape is more flat, height smaller such as 20mm~60mm, preferably 20mm, to minimize self weight pair
The influence of rock sample, push-down head are also with cylindrical element, and highly without particular/special requirement, upper pressure should be not less than by pushing grease head highness
The height of head, preferably upper and lower fall head are identical.It is provided between non-test specimen position and seaming chuck at the top of piece fixture
Stalloy, to block up oil during specific test and to support heat shrinkage film.
Rock shearing test method is carried out based on above-mentioned component, is included the following steps：
(1) it samples and is processed on the spot from scene, the requirement of sample dimensions required for allowing to meet, and record examination
Part size；
(2) upper pressure drop reducing structure is pasted in the opposite confining pressure compression face two sides of test specimen, in order to survey in failure by shear
Other multiple parameters are measured, foil gauge 10 can not be connected with by the two sides of direct force, for monitoring test specimen, test specimen is put into folder
Have in accommodating cavity, a little lubricating oil added at grooving mouth, respectively fits to two pressure drop reducing structure other sides on the inside of fixture,
With hand extrusion clamp, fit closely it；
(3) fixture and test specimen are placed on push-down head, and are directed at the axis of test specimen and push-down head, then gently by seaming chuck
It is placed in above test specimen, the axis of test specimen and push-down head is aligned, then the one circle steel of addition on the outside of seaming chuck and test specimen gap
Piece realizes the effect of subsequent stifled oil and support heat shrinkage film, completes the production of presser unit main body；
(4) it selects diameter to be slightly larger than the heat shrinkage film of upper and lower pressure head diameter, is inserted in from top to down to the entire presser unit of covering
Heat shrinkage film hair dryer is adjusted to certain temperature by main body, and heating blow heat shrinkage film to heat shrinkage film is bonded with presser unit surface；
(5) presser unit for being fitted with heat shrinkage film is integrally placed on three-axis tester, falls machine pressure head, make its with
After there is gentle touchdown on presser unit seaming chuck surface, three axis cabins are fallen, it is oil-filled to the progress of three axis cylinders, machine loading procedure is carried out
Setting, sets loading speed and loading method, and first plus confining pressure, subsequent addition axis straightening extremely destroy.Experiment starts machine will be by
Automation load is carried out according to the loading method set, peak value axial direction pressure size P when record test specimen destroyscr；
(6) it is based on peak value axial direction pressure size PcrAnd sample dimensions, shear strength τ=P of surveyed rock is calculatedcr/
(B×H0), wherein B is the width of test specimen bottom surface, H0For the spacing of two groovings.
Embodiment
Rock shearing test method, includes the following steps：
(1) the silk screen subterranean laboratory diversion tunnel griotte core of buried depth 2400m, the aforementioned rock of processing cost application are selected
Stone direct shear test test specimen, test specimen bottom surface are square, and its side length is 50mm, a height of 150mm is the distance on the left of test specimen when processing
The grooving that 34mm setting one is 1mm through test specimen inner thickness at top, grooving trend are parallel to top surface, long 25mm, rectangular
The grooving that same setting one is 1mm through test specimen inner thickness at the 34mm of bottom on the right side of body test specimen, becomes entire test specimen
One centrosymmetric image, then the spacing H between two groovings0=80mm.
(2) radius 120mm diameter is selected, intermediate hexagonal indentations are 50mm, and the solid steel staight scissors of height 148mm press from both sides
Tool, upper polytetrafluoroethylene (PTFE) pressure drop reducing structure is padded in the left and right sides around test specimen, and foil gauge is sticked with 502 glue in front and rear sides, and with setting
Rouge further fixes.Test specimen is packed among fixture groove fixture later, a little lubricating oil is added at strip notch, is squeezed with hand
Steel clamps are pressed, it is fitted closely.Fixture and test specimen are placed on push-down head, and are directed at the axis of test specimen and push-down head,
Seaming chuck is gently placed in again above test specimen, the axis of test specimen and seaming chuck is aligned, then in seaming chuck and test specimen gap
Steel disc is added in outside, completes the production of presser unit.
(3) selecting diameter is the heat shrinkage film of 125mm diameter, is inserted in from top to down to entire presser unit main body is covered, will
Heat shrinkage film hair dryer is adjusted to 280 DEG C, and heating blow heat shrinkage film to heat shrinkage film is bonded with presser unit surface.
(4) testing machine used by this experiment is MTS815Flex Test GT Rock Mechanics Test system, test method
For：The device made is integrally placed on three-axis tester, machine pressure head is fallen, there is it slightly with device seaming chuck surface
After contact, three axis cabins are fallen, three axis cylinders are carried out oil-filled.The loading method of machine is set：It is first loaded with the rate of 2MPa/min
Confining pressure is to 4MPa, after confined pressure steady, with 20kN/min loading axis pressure, adds axis straightening to destroying, peak when recording device destroys
It is worth axial compressive force size Pcr=124.03kN.
(5) be calculated test specimen in confining pressure 4MPa test specimen shearing strength be τ=124.03kN/ (80mm*50mm)=
31.01MPa。
In order to improve result precision, it can repeatedly measure and average.
By speciality fixture, rock direct shear test test specimen, which is fixed in three-axis force experimental machine, can carry out test, base
In above-mentioned test specimen, fixture and presser unit, the straight of rock can carried out in the three-axis force experimental machine that can only be compressed
Scissor test, a kind of supplement as three-axis force experimental machine experimental use.The three-axis tester of the application is exactly three conventional axis
Mechanics machine is provided with novel measuring device such as loaded type CT scan, such as MTS815Flex Test GT
Rock Mechanics Test system.By the above analogy method, the shearing by exploring rock on conventional three-axis tester can be obtained
Strength characteristic makes full use of the function of rock triaxial test machine, and can be in conjunction with loaded type on rock normal triaxial mechanics machine
The novel measurement means such as CT scan, convenient for exploring generation, the extension of shear plate of test specimen macroscopic view and microfissure during staight scissors
With perforation process, the target that diversification measures is realized；It is loaded by confining pressure and surface of test piece compression is provided, can preferably solved
Test specimen is uneven by the stress distribution in the face of cutting in conventional rock direct shearing test, and application horizontal force direction precision prescribed is higher, is also easy to produce
The problem of error.This method, can also be in other brittleness and quasi- brittleness material other than the shearing test that can be used for rock material
Material is (such as：Concrete, ceramics etc.) shear strength measurement.
Claims (9)
1. rock direct shear test test specimen, which is characterized in that the test specimen can be directly used for three-axis tester, including cuboid sheet
Body, left part is provided with the first grooving on the downside of ontology, and the first grooving extends to body interior in the horizontal direction from avris, further includes the
Two groovings, the first grooving and the second grooving are centrosymmetric distribution centered on body central, grooving length and its where it is rectangular
The avris length of body ontology is identical, and notch width is no longer than the half of bottom surface side length.
2. test specimen as described in claim 1, which is characterized in that body height H, bottom surface side length are respectively A, B, H >=A >=B,
Grooving is with a thickness of D, D < 0.04A.
3. rock direct shear test piece fixture, which is characterized in that including left semicircle cylindrical component and right semi-circle cylindrical component, two
Semi-cylindrical component is detachably arranged relatively, is provided between left semicircle cylindrical component and right semi-circle cylindrical component for placing rock
The cross section of the accommodating cavity of stone direct shear test test specimen, accommodating cavity is hexagon, and accommodating cavity runs through jig main body bottom surface and top surface.
4. piece fixture as claimed in claim 3, which is characterized in that further include pressure drop reducing structure, pressure drop reducing structure is respectively arranged at test specimen
Between left semicircle cylindrical component and right semi-circle cylindrical component, material is polytetrafluoroethylene (PTFE).
5. piece fixture as claimed in claim 3, which is characterized in that be provided on the side plane of left semicircle cylindrical component recessed
Slot, the side plane of right semi-circle cylindrical component are provided with the protrusion to match with groove, by groove with raised by left and right semicolumn
Shape component is fastened togather；In addition to accommodating cavity position, the spacing of left semicircle cylindrical component and right semi-circle cylindrical component is 0.5~
2mm, accommodating cavity position are the position where accommodating cavity.
6. piece fixture as claimed in claim 3, which is characterized in that left semicircle cylindrical component and right semi-circle cylindrical component institute shape
At cylindrical element height be lower than 1~2mm of test specimen.
7. the presser unit of rock shearing test, which is characterized in that including seaming chuck, push-down head and as appointed in claim 3~6
Rock direct shear test piece fixture described in one claim, the outer diameter of three is consistent, and seaming chuck and push-down head are respectively to justify
Column member.
8. presser unit as claimed in claim 7, which is characterized in that it further include steel disc, the non-test specimen institute at the top of piece fixture
Stalloy is provided between position and seaming chuck.
9. presser unit as claimed in claim 7, which is characterized in that piece fixture is rigid steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820513607.3U CN208109568U (en) | 2018-04-11 | 2018-04-11 | Rock direct shear test test specimen, piece fixture and presser unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820513607.3U CN208109568U (en) | 2018-04-11 | 2018-04-11 | Rock direct shear test test specimen, piece fixture and presser unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426788A (en) * | 2018-04-11 | 2018-08-21 | 四川大学 | Rock direct shearing test test specimen, piece fixture and its shearing test method |
| CN113552323A (en) * | 2021-08-03 | 2021-10-26 | 山西银锋科技有限公司 | High-pressure rock grouting test experiment system and test method thereof |
-
2018
- 2018-04-11 CN CN201820513607.3U patent/CN208109568U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426788A (en) * | 2018-04-11 | 2018-08-21 | 四川大学 | Rock direct shearing test test specimen, piece fixture and its shearing test method |
| CN113552323A (en) * | 2021-08-03 | 2021-10-26 | 山西银锋科技有限公司 | High-pressure rock grouting test experiment system and test method thereof |
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