CN111238906B - Pressurized curing device for shear test sample and test method thereof - Google Patents
Pressurized curing device for shear test sample and test method thereof Download PDFInfo
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- CN111238906B CN111238906B CN202010192963.1A CN202010192963A CN111238906B CN 111238906 B CN111238906 B CN 111238906B CN 202010192963 A CN202010192963 A CN 202010192963A CN 111238906 B CN111238906 B CN 111238906B
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- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 238000010008 shearing Methods 0.000 claims abstract description 79
- 238000007789 sealing Methods 0.000 claims abstract description 40
- 238000012423 maintenance Methods 0.000 claims abstract description 33
- 230000000712 assembly Effects 0.000 claims abstract 2
- 238000000429 assembly Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 description 43
- 239000000463 material Substances 0.000 description 13
- 238000001723 curing Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 7
- 239000011435 rock Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
- G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a shear test sample pressure maintenance device and a test method thereof, wherein the device comprises: the box body is provided with an opening on one side face; the top of the box body is provided with a fixing hole, and two side surfaces of the box body perpendicular to the axis of the fixing hole are respectively provided with a first mounting hole and a second mounting hole; a sample placing table is arranged at the bottom of the sample placing table and corresponds to the fixing hole; a pressure sealing space is formed after the sealing plate is arranged at the opening position; the first mounting hole and the second mounting hole are respectively provided with a first shearing component and a second shearing component which can rotate and axially move along the first shearing component and the second shearing component; the fixing hole is provided with a fixing rod assembly capable of moving along the vertical direction and used for abutting against the top of the first shearing assembly; an oil inlet pipe is connected to one side of the bottom of the box body; an oil outlet pipe is connected to the other side of the bottom of the box body; the shearing assemblies are respectively connected with the operation ends of the shearing tester; the oil inlet pipe and the oil outlet pipe are respectively connected with an external hydraulic pump station; the fixing hole, the first mounting hole and the second mounting hole are respectively provided with a sealing component.
Description
Technical Field
The invention relates to the technical field of rock mechanics tests, in particular to a shear test sample pressure maintenance device and a test method thereof.
Background
The shear test is one of the most important basic tests of geotechnical engineering, and is an indispensable test means for geotechnical engineering workers to examine the engineering mechanical properties of rock mass or soil mass, seek reasonable design parameters and conduct theoretical research. In the shear test of artificial casting rock-like materials such as concrete, filling bodies, raw rock similar simulation samples and the like, at present, the samples are mostly cast in a mould, the samples are demolded, the shear test samples are taken out, then the samples are put into an incubator for maintenance, and finally, a shear test machine is adopted to carry out the shear test on the samples after maintenance. In practical engineering application, the rock-like material bears the action of ground stress or load after final setting, but in the current sample curing method, the sample is cured in a free environment without pressure constraint, and the stress condition of the rock-like material in practical engineering cannot be reduced. During the period from final setting to curing of the manually poured rock-like material, the microscopic particles inside the sample in the pressure environment are mutually extruded and compacted, so that the sample actually has better mechanical properties. In order to simulate the stress constraint condition of a rock-like material in an actual engineering from a sample curing process, the shear strength of a sample under the confining pressure condition is accurately measured, so that how to provide a device for providing certain confining pressure in the sample curing process and simultaneously directly carrying out a shear test after the sample curing is finished is a problem to be solved by a person skilled in the art.
Disclosure of Invention
Therefore, the invention aims to provide a pressure maintenance device for a shear test sample, which solves the problems that the simulated rock-like material lacks stress constraint in the sample maintenance process in actual engineering and the shear strength of the sample is difficult to restore under the actual condition.
The invention provides a shear test sample pressure maintenance device, which comprises:
The box body is provided with an opening on one side face; the top of the box body is provided with a fixing hole, and two side surfaces of the box body perpendicular to the axis of the fixing hole are respectively provided with a first mounting hole and a second mounting hole; a sample placing table for placing a sample is arranged at the bottom of the sample placing table corresponding to the fixing hole;
The sealing plate is arranged at the opening position and then is provided with a pressure sealing space;
The first shearing assembly is installed at the first installation hole and can rotate and axially move along the first installation hole, and the first shearing assembly can be placed at the upper part of the sample;
The second shearing assembly is arranged at the second mounting hole, can rotate and axially move along the second mounting hole, is opposite to the first shearing assembly, and is arranged at the lower part of the sample;
The fixing rod assembly is arranged on the fixing hole and can move along the vertical direction and is used for abutting against the top of the first shearing assembly;
an oil inlet pipe is connected to one side of the bottom of the box body;
the oil outlet pipe is connected to the other side of the bottom of the box body;
the first shearing assembly and the second shearing assembly are respectively connected with the operation end of the shearing testing machine, and the fixed rod assembly is manually controlled to move in the vertical direction; the oil inlet pipe and the oil outlet pipe are respectively connected with an external hydraulic pump station; the fixing hole, the first mounting hole and the second mounting hole are respectively provided with a sealing component.
Compared with the prior art, the invention discloses a pressure maintenance device for a shear test sample, which provides a pressure maintenance environment for the shear test sample in a box body, and the device is arranged on a shear test machine to directly perform a shear test after the sample maintenance is completed, so that the shear strength parameters of the rock-like material are obtained, a certain confining pressure is realized in the sample maintenance process, and the stress condition of the rock-like material in practical engineering is reduced.
Further, the bottom of the tank body has a gradient of 3.5-5 degrees from the oil outlet pipe side to the oil inlet pipe side, so that impurities can conveniently flow out of the tank body along with the oil flow, and the oil can be conveniently discharged after the test.
Further, the first shear assembly comprises: a first shear bar and a first shear box; the load end of the first shear rod is connected with the operation end of the shear testing machine, and the other end of the first shear rod can rotate, axially move in the first mounting hole and is fixed with the first shear box; the first shear box is in a bucket shape with a downward opening, and the inner wall of the bucket is abutted against the upper part of the sample.
Further, the second shearing assembly comprises a second shearing rod, a second shearing box and an extending plate; the load end of the second shear rod is connected with the operation end of the shear testing machine, and the other end of the second shear rod can rotate, axially move in the second mounting hole and is fixed with the second shear box; the second shearing box is in a bucket shape with an upward opening, and the inner wall of the bucket is abutted with the lower part of the sample; the extension plate is connected with the inner wall of the second shear box and extends away from the inner direction of the bucket. The sum of the heights of the first shear box and the second shear box is equal to the height of the sample.
Further, the dead lever assembly includes: a fixing rod and a fixing plate; the load end of the fixed rod extends out of the box body, the middle part of the fixed rod is provided with external threads, and the external threads are matched with nuts fixed on the box body to realize manual rotation so as to enable the fixed rod to move up and down along the vertical direction; the other end is fixed with a fixed plate, and the fixed plate is contacted with the top of the first shearing box.
Further, the load ends of the first shear rod and the second shear rod are respectively provided with an internal thread matched with the external thread of the piston rod of the operation end of the shear tester.
Further, the fixing hole, the first mounting hole and the second mounting hole are all provided with sealing piece mounting grooves, and the mounting grooves are provided with an integrally formed supporting ring, a Y-shaped ring and a dust ring from inside to outside.
The sealing is realized by adopting a supporting ring, a Yx type sealing ring and a dust ring, and the supporting ring is arranged on the inner side of the box body and mainly used for supporting the shearing rod or the fixing rod; the problems of poor sealing effect and short service life caused by uneven bearing caused by non-vertical stress of the shearing rod or the fixing rod to the rod piece sealing are prevented.
Further, the oil inlet pipe and the oil outlet pipe are respectively provided with a valve.
Further, a filter screen is fixed between the oil pipes through flanges at the oil outlet end of the oil outlet pipe. And the rock scraps generated after the shearing test are filtered, and the flange plate can be periodically disassembled to clean and replace the filter screen.
Through dismantling the flange, can clear up or change the filter screen, filter impurity prevents to cause oil pipe to block up.
Another object of the present invention is to provide a test method based on the shear test specimen pressure maintenance device, comprising the steps of:
s1, demolding after solidifying a sample to be poured, packaging the demolded sample with a soft sample sealing sleeve, detaching a sealing plate on a box body, moving a fixing rod assembly upwards to the highest position, positioning a first shearing assembly at an initial position far away from a sample placing table, positioning a second shearing assembly on the sample placing table, and placing the sample on the second shearing assembly; attaching a square gasket to the opening of the box body, covering a sealing plate, and screwing a bolt;
s2, controlling an external hydraulic pump station to feed oil to an oil inlet pipe, keeping the confining pressure in the box body and stabilizing the hydraulic pressure at 0.1-30 Mpa, and maintaining for 28 days;
S3, placing the maintenance test device on a shear test machine operation table, connecting a test machine piston rod and a shear rod load end, locking by using an auxiliary nut, closing after 50-100 ml of oil is discharged from an oil outlet pipe, firstly moving a first shear assembly to contact the upper part of a sample, then moving a second shear assembly to fix the sample, and downwards moving a fixing rod assembly to contact the first shear assembly and then fixing; simultaneously and gradually applying shearing force to the first shearing assembly and the second shearing assembly until the sample is broken, recording breaking load and deformation conditions in the breaking process of the sample, and calculating the shearing force according to a formula of tau=F Q/A;
Where τ is the shear strength, F Q is the breaking load, and A is the area against which the force is applied.
Compared with the prior art, the test method of the pressure maintenance device for the shear test sample provided by the invention provides a pressure maintenance environment for the shear test sample, and the device is arranged on a shear test machine to directly perform a shear test after the sample maintenance is finished, so that the shear strength parameters of rock-like materials are obtained, the operation is convenient, and the measured data is closer to the real situation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram showing a cross-sectional view of a shear test specimen pressure maintenance device according to the present invention;
FIG. 2 is a rear view of a pressurized curing device for shear test specimens in accordance with the present invention;
FIG. 3 is a schematic view of a first shear assembly;
FIG. 4 is a schematic diagram of a second shear assembly;
FIG. 5 is a schematic view of the installation of the seal assembly;
FIG. 6 is a schematic diagram showing the installation of a filter screen and flowline;
In the figure: 100-box, 101-fixed hole, 102-sample placing table, 200-sealing plate, 300-first shearing assembly, 301-first shearing rod, 302-first shearing box, 400-second shearing assembly, 401-second shearing rod, 402-second shearing box, 403-extension plate, 500-fixed rod assembly, 501-fixed rod, 502-fixed plate, 600-oil inlet pipe, 700-oil outlet pipe, 800-sealing assembly, 801-supporting ring, 802-Y-shaped ring, 803-dust ring, 900-filter screen and Y-sample.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Referring to fig. 1-2, the invention provides a shear test sample pressure maintenance device, comprising:
A case 100 having an opening at one side thereof; the top of the box body is provided with a fixing hole 101, and two side surfaces of the box body 100 which are perpendicular to the axis of the fixing hole 101 are respectively provided with a first mounting hole and a second mounting hole; a sample placing table 102 for placing a sample Y is arranged at the bottom of the sample placing table corresponding to the fixing hole 101;
the sealing plate 200 is provided with a pressure sealing space after the sealing plate 200 is arranged at the opening position;
The first shearing assembly 300, the first shearing assembly 300 which can rotate and can move along the axial direction is installed at the first installation hole, and the first shearing assembly 300 can be placed on the upper part of the sample Y;
The second shearing assembly 400 is installed at the second installation hole, the second shearing assembly 400 which can rotate and move along the axial direction of the second shearing assembly 400 and is opposite to the first shearing assembly 300 is installed at the second installation hole, and the second shearing assembly 400 is placed at the lower part of the sample Y;
The fixing rod assembly 500, on which the fixing hole 101 is mounted the fixing rod assembly 500 movable in the vertical direction for abutting against the top of the first shearing assembly 300;
an oil inlet pipe 600, which is connected to one side of the bottom of the case 100;
the oil outlet pipe 700 is connected to the other side of the bottom of the tank body 100;
the first shearing assembly 300 and the second shearing assembly 400 are respectively connected with the operation end of the shearing tester, and the fixed rod assembly 500 is manually controlled to move in the vertical direction; the oil inlet pipe 600 and the oil outlet pipe 700 are respectively connected with an external hydraulic pump station; the fixing hole 101, the first mounting hole, and the second mounting hole are respectively mounted with the sealing assembly 800.
The invention discloses a pressure maintenance device for a shear test sample, which provides a pressure maintenance environment for the shear test sample in a box body, and the device is arranged on a shear test machine to directly perform the shear test after the sample maintenance is completed, so that the shear strength parameters of the rock-like material are obtained, a certain confining pressure is realized in the sample maintenance process, and the stress condition of the rock-like material in the actual engineering is reduced.
Wherein the box body can be made of ductile cast iron with the length of 500mm, the width of 300mm, the height of 300mm and the thickness of 20 mm. The opening is 150×150mm's opening, and the closing plate is square board of side length 200mm, and 150×150mm department thickness is 10 mm's spheroidal graphite cast iron in the middle of the closing plate makes, and the closing plate edge sets up square packing ring with the box contact surface, and 4 screw holes are processed in the position of four angles of closing plate, use hexagon head M8 bolt, can bear 30Mpa confining pressure.
Advantageously, the bottom of the tank 100 has a gradient of 3.5 ° to 5 ° from the oil outlet pipe 700 side to the oil inlet pipe 600 side; the impurity can conveniently flow out of the box body along with the oil flow, and the oil can be conveniently discharged after the test.
Referring to fig. 3, the first shear assembly 300 includes: a first shear bar 301 and a first shear box 302; the load end of the first shear rod 301 is connected with the operation end of the shear tester, and the other end of the first shear rod is rotatable, axially movable in the first mounting hole and fixed with the first shear box 302; the first shear box 302 has a bucket shape with a downward opening, and the inner wall of the bucket abuts against the upper portion of the sample Y.
Referring to fig. 4, the second shear assembly 400 includes a second shear bar 401, a second shear box 402, and an extension plate 403; the load end of the second shear bar 401 is connected with the operation end of the shear testing machine, and the other end of the second shear bar is rotatable, axially movable in the second mounting hole and fixed with the second shear box 402; the second shear box 402 has a bucket shape with an upward opening, and the inner wall of the bucket is in contact with the lower part of the sample Y; the extension plate 403 is connected to the inner wall of the second shear box 402 and extends away from the interior of the bucket. The sum of the heights of the first shear box and the second shear box is equal to the height of the sample.
Referring to fig. 1, the fixing lever assembly 500 includes: a fixing lever 501 and a fixing plate 502; the load end of the fixing rod 501 extends out of the box body 100, and the middle part of the fixing rod is provided with external threads which are matched with nuts fixed on the box body 100 to realize manual rotation so as to enable the fixing rod to move up and down along the vertical direction; the other end is fixed to a fixed plate 502, and the fixed plate 502 is in contact with the top of the first shear box 302. The fixing plate 502 may be a square plate of 100×100 mm.
In the above embodiment, the load end of the first shear bar 301 and the load end of the second shear bar 401 are each provided with an internal thread which is matched with the external thread of the piston rod of the operation end of the shear testing machine.
Referring to fig. 5, the fixing hole 101, the first mounting hole and the second mounting hole each have a seal mounting groove, and the mounting groove is provided with an integrally formed support ring 801, Y-shaped ring 802 and dust-proof ring 803 from inside to outside. The sealing is realized by adopting a supporting ring, a Yx type sealing ring and a dust ring, and the supporting ring is arranged on the inner side of the box body and mainly used for supporting the shearing rod or the fixing rod; the problems of poor sealing effect and short service life caused by uneven bearing caused by non-vertical stress of the shearing rod or the fixing rod to the rod piece sealing are prevented. The box body can adopt split type corresponding to the mounting groove, and sealing elements are convenient to mount and dismount.
Advantageously, the oil inlet pipe 600 and the oil outlet pipe 700 are respectively provided with a valve, and the valves can be manual mechanical valves or electronic valves to control the on-off of the oil inlet pipe and the oil outlet pipe channels.
Advantageously, referring to fig. 6, the outlet end of the flowline 700 has a screen 900 secured between the tubing by flanges. And the rock scraps generated after the shearing test are filtered, and the flange plate can be periodically disassembled to clean and replace the filter screen. The flange is connected with the oil pipe 1000mm away from the oil outlet and is arranged between the two sections of oil pipes.
The invention also provides a test method based on the shear test sample pressure maintenance device, which comprises the following steps:
s1, demolding after solidifying a sample to be poured, packaging the demolded sample with a soft sample sealing sleeve, detaching a sealing plate on a box body, moving a fixing rod assembly upwards to the highest position, positioning a first shearing assembly at an initial position far away from a sample placing table, positioning a second shearing assembly on the sample placing table, and placing the sample on the second shearing assembly; attaching a square gasket to the opening of the box body, covering a sealing plate, and screwing a bolt;
s2, controlling an external hydraulic pump station to feed oil to an oil inlet pipe, keeping the confining pressure in the box body and stabilizing the hydraulic pressure at 0.1-30 Mpa, and maintaining for 28 days;
S3, placing the maintenance test device on a shear test machine operation table, connecting a test machine piston rod and a shear rod load end, locking by using an auxiliary nut, closing after 50-100 ml of oil is discharged from an oil outlet pipe, firstly moving a first shear assembly to contact the upper part of a sample, then moving a second shear assembly to fix the sample, and downwards moving a fixing rod assembly to contact the first shear assembly and then fixing; simultaneously and gradually applying shearing force to the first shearing assembly and the second shearing assembly until the sample is broken, recording breaking load and deformation conditions in the breaking process of the sample, and calculating the shearing force according to a formula of tau=F Q/A;
Where τ is the shear strength, F Q is the breaking load, and A is the area against which the force is applied.
The test method is exemplified by cement samples, and is specifically as follows:
Demoulding after the poured cement sample is solidified, packaging the demoulded sample with a soft sample sealing sleeve, removing bolts on a sealing plate in front of the box body, removing the sealing plate, unscrewing a fixing nut, and moving the fixing rod piece upwards to the highest position. The sample was placed on a second shear box. And (3) tightly attaching a square gasket at the opening position of the box body, covering a sealing plate, and manually screwing 4 bolts.
And opening an oil inlet valve to send oil to apply confining pressure to the sample, stabilizing the hydraulic pressure at 1Mpa, and maintaining for 28 days.
The maintenance test device is placed on a shear test machine operation table, a piston rod and a load end of the shear rod are connected, and the maintenance test device is locked by an auxiliary nut. And opening the oil outlet valve to release 100ml, closing, firstly moving the first shearing box to contact the sample, then moving the second shearing box until the sample is fixed, and manually tightening the screw cap to fix after the fixing rod piece is moved downwards to contact the first shearing box. Two shear rod pieces are arranged on a computer connected with a shear testing machine, shearing force is applied gradually at 0.004mm/s until a sample is broken, the sensor collected data shows that the sample is broken when the shearing force reaches 45KN, the shear displacement is 1.260mm, and the shear strength result of the sample is calculated to be 4.5Mpa according to a shear strength calculation formula. The shear displacement represents the deformation condition of the sample and provides basis for the subsequent comparison test.
And then opening an oil outlet valve, recovering a sample after hydraulic oil flows out, and detaching the flange to clean the filter screen.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. The test method of the shear test sample pressurized maintenance device is characterized by comprising the following steps of:
s1, demolding after solidifying a sample to be poured, wrapping the demolded sample with a soft sample sealing sleeve, detaching a sealing plate on a box body, moving a fixing rod assembly upwards to the highest position, positioning a first shearing assembly at an initial position far away from a sample placing table, positioning a second shearing assembly on the sample placing table, and placing the sample on the second shearing assembly; attaching a square gasket to the opening of the box body, covering a sealing plate, and screwing a bolt;
S2, controlling an external hydraulic pump station to feed oil to an oil inlet pipe, keeping confining pressure in the box body and stabilizing the hydraulic pressure at 0.1-30 mpa, and maintaining for 28 days;
S3, placing the maintenance test device on an operation table of the shear test machine, connecting a piston rod of the test machine with a load end of a shear rod, locking by using an auxiliary nut, discharging 50-100 ml of oil from an oil outlet pipe, closing, firstly moving a first shear assembly to contact the upper part of a sample, then moving a second shear assembly to fix the sample, and downwards moving a fixing rod assembly to contact the first shear assembly and then fixing; simultaneously and gradually applying shearing force to the first shearing assembly and the second shearing assembly until the sample is broken, recording breaking load and deformation conditions in the breaking process of the sample, and calculating the shearing force according to a formula of tau=F Q/A;
Where τ is the shear strength, F Q is the breaking load, A is the area against which the force is applied;
Wherein there is pressure maintenance device includes: a case (100) having an opening on one side thereof; the top of the box body is provided with a fixing hole (101), and two side surfaces of the box body (100) which are perpendicular to the axis of the fixing hole (101) are respectively provided with a first mounting hole and a second mounting hole; a sample placing table (102) for placing a sample (Y) is arranged at the bottom of the fixing hole (101) at a position corresponding to the fixing hole;
the sealing plate (200) is arranged at the open position, and a pressure sealing space is formed after the sealing plate (200) is arranged at the open position;
A first shear assembly (300) mounted at the first mounting hole with the first shear assembly (300) being rotatable and axially movable along the first mounting hole, the first shear assembly (300) being placeable on top of the specimen (Y);
A second shear assembly (400) mounted at the second mounting hole with the second shear assembly (400) being rotatable and axially movable along the second mounting hole and being opposite to the first shear assembly (300), and the second shear assembly (400) being placed at the lower part of the sample (Y);
a fixing rod assembly (500), wherein the fixing hole (101) is provided with the fixing rod assembly (500) capable of moving along the vertical direction and is used for abutting against the top of the first shearing assembly (300);
an oil inlet pipe (600), wherein one side of the bottom of the box body (100) is connected with the oil inlet pipe (600);
The oil outlet pipe (700) is connected to the other side of the bottom of the box body (100);
Wherein the first shearing assembly (300) and the second shearing assembly (400) are respectively connected with the operation end of the shearing tester, and the fixed rod assembly (500) is manually controlled to move along the vertical direction; the oil inlet pipe (600) and the oil outlet pipe (700) are respectively connected with an external hydraulic pump station; sealing assemblies (800) are respectively arranged in the fixing holes (101), the first mounting holes and the second mounting holes.
2. The method for testing the shear test specimen pressure maintenance device according to claim 1, wherein the bottom of the box body (100) has a gradient of 3.5-5 degrees from the oil outlet pipe (700) side to the oil inlet pipe (600) side.
3. The method of testing a shear test specimen pressurized curing device according to claim 1, characterized in that said first shear assembly (300) comprises: a first shear bar (301) and a first shear box (302); the load end of the first shearing rod (301) is connected with the operation end of the shearing tester, and the other end of the first shearing rod is rotatable, axially movable in the first mounting hole and fixed with the first shearing box (302); the first shear box (302) is in a bucket shape with a downward opening, and the inner wall of the bucket is abutted against the upper part of the sample (Y).
4. A method of testing a shear test specimen pressurized curing device according to claim 3, in which the second shear assembly (400) comprises a second shear bar (401), a second shear box (402) and an extension plate (403); the load end of the second shear rod (401) is connected with the operation end of the shear testing machine, and the other end of the second shear rod is rotatable, axially movable in the second mounting hole and fixed with the second shear box (402); the second shear box (402) is in a bucket shape with an upward opening, and the inner wall of the bucket is abutted against the lower part of the sample (Y); the extension plate (403) is connected to the inner wall of the second shear box (402) and extends away from the interior of the bucket.
5. The method of testing a shear test specimen pressurized curing device according to claim 4, characterized in that said fixed rod assembly (500) comprises: a fixing rod (501) and a fixing plate (502); the load end of the fixed rod (501) extends out of the box body (100), an external thread is arranged in the middle of the fixed rod, and the external thread is matched with a nut fixed on the box body (100) to realize manual rotation so as to enable the fixed rod to move up and down along the vertical direction; the other end is fixed with the fixed plate (502), and the fixed plate (502) is contacted with the top of the first shearing box (302).
6. The method for testing a pressurized curing apparatus for shear test specimens according to claim 5, wherein the load ends of the first shear bar (301) and the second shear bar (401) are each provided with an internal thread which mates with the external thread of the piston rod of the operating end of the shear tester.
7. The method for testing the pressurized maintenance device for the shear test specimen according to claim 5, wherein the fixing hole (101), the first mounting hole and the second mounting hole are provided with sealing member mounting grooves, and the mounting grooves are provided with a supporting ring (801), a Y-shaped ring (802) and a dust ring (803) which are integrally formed from inside to outside.
8. The method for testing a shear test specimen pressurized maintenance device according to claim 1, wherein the oil inlet pipe (600) and the oil outlet pipe (700) are respectively provided with a valve.
9. The method for testing the pressurized maintenance device for the shear test sample according to claim 1, wherein the oil outlet end of the oil outlet pipe (700) is fixedly provided with a filter screen (900) between the oil pipes through a flange.
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| CN211697175U (en) * | 2020-03-18 | 2020-10-16 | 武汉科技大学 | Pressure maintenance device for shear test sample |
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| KR20120066464A (en) * | 2010-12-14 | 2012-06-22 | 연세대학교 산학협력단 | Tri-axial compression tester and chamber of the tri-axial compression tester |
| CN105547864A (en) * | 2016-01-22 | 2016-05-04 | 武汉轻工大学 | Method for determining shear strength of chemically polluted soil and special full-automatic direct shear apparatus |
| CN110726822A (en) * | 2019-10-21 | 2020-01-24 | 南京林业大学 | Method for testing expansibility and shear strength of carbonized soil in carbonization process of magnesium oxide solidified soil |
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