CN117268881A - Coal-filling material combined sample manufacturing and loading test device and method thereof - Google Patents
Coal-filling material combined sample manufacturing and loading test device and method thereof Download PDFInfo
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- CN117268881A CN117268881A CN202311349088.3A CN202311349088A CN117268881A CN 117268881 A CN117268881 A CN 117268881A CN 202311349088 A CN202311349088 A CN 202311349088A CN 117268881 A CN117268881 A CN 117268881A
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- 238000012360 testing method Methods 0.000 title claims abstract description 59
- 239000000463 material Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000003245 coal Substances 0.000 claims abstract description 44
- 238000012544 monitoring process Methods 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000011065 in-situ storage Methods 0.000 claims abstract description 5
- 239000000523 sample Substances 0.000 claims description 67
- 239000011435 rock Substances 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 18
- 239000002436 steel type Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 238000011160 research Methods 0.000 claims description 5
- 230000001939 inductive effect Effects 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 239000000945 filler Substances 0.000 description 6
- 230000006378 damage Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000000007 visual effect Effects 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
- G01N1/36—Embedding or analogous mounting of samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- 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
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- 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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- Physics & Mathematics (AREA)
- General 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)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a coal-filling material combined sample making and loading device and a using method thereof, wherein the device comprises an acrylic plate, a loading head, an inserting sheet baffle plate, a channel-like steel base, a left baffle plate, a right baffle plate, a spring nut, a stress monitoring system and an acoustic emission monitoring system; the observation of plane strains of coal and filling materials during loading is realized through the acrylic plate, and auxiliary equipment DIC can be used for monitoring; absolute constraint can be realized by whether left and right baffles are present or not; observing the time-space evolution rule of the coal body fracture in the loading process by utilizing the positioning function of acoustic emission; by using the pressure box in front of the coal body and the filling material, the change process of the interaction stress of different coals and the filling material can be observed. The device is matched with a single-shaft testing machine, in-situ loading can be carried out in the manufacturing device, and corresponding detection equipment is added, so that the study on the mechanical properties of the coal-filling material combined sample and the fracture space-time evolution rule of the coal body is simply and effectively realized.
Description
Technical Field
The invention relates to the technical field of engineering rock mass, in particular to a device and a method for manufacturing and loading test samples of a coal-filling material combination.
Background
In the strip filling process, the coal, the filling body, the corresponding support and the like bear load together, so that the mechanical properties of the strip filling process are different from those of pure coal and filling materials. To accurately obtain the mechanical properties of the coal in a coal-filled material combination is advantageous for accurately recognizing the coal body destruction morphology, so that a mold is required to make the coal and the filling material into a test piece for simulating the state under the condition of ground stress. At present, no better method is available for accurately obtaining the time-space evolution rule of the fracture of the coal and filling material combined sample under the uniaxial compression tester through a laboratory mechanical test. At present, the mechanical experiment of the coal and filler combination body is less studied, the research on the action mechanism of the cooperation of the coal and filler body under the action of vertical load is not clear, and the research on the principle of the mutual transmission of stress is not clear.
Disclosure of Invention
The invention aims to solve the problems and provide a coal-filling material combined sample manufacturing and loading test device and a method thereof. In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a coal-filling material combination sample preparation, loading test device, includes ya keli board, loading head, inserted sheet baffle, class channel-section steel type base, left baffle, right baffle, spring nut, stress monitoring system, acoustic emission monitoring system, stress monitoring system includes the pressure cell, acoustic emission monitoring system includes acoustic emission inductive probe, class channel-section steel type base left side is provided with left baffle, class channel-section steel type base right side is provided with right baffle, class channel-section steel type base front side is provided with the observation window, the observation window inboard is provided with the ya keli board, the ya keli inboard is provided with a plurality of slots, be provided with the inserted sheet baffle in the slot, the inserted sheet baffle is used for cutting apart a plurality of pouring spaces with class channel-section steel type base, pouring space bottom is provided with spring nut, be provided with acoustic emission inductive probe on the spring nut, the pressure cell sets up on the coal sample lateral wall, pouring space top is provided with the loading head.
Further, the left baffle is detachably connected to the left side of the channel steel-like base through bolts;
further, the right baffle is detachably connected to the right side of the channel-like steel base through bolts;
further, a left handle is arranged on one side of the left baffle;
further, a right handle is arranged on one side of the right baffle;
furthermore, the channel-like steel base is provided with a guiding-out hole, and the acoustic emission sensing probe and the data wire of the pressure box are guided out of the channel-like steel base through the guiding-out hole;
an experimental method for manufacturing and loading a test device for a coal-filling material combined sample comprises the following steps: (1) First usingThe left baffle plate, the right baffle plate and the channel steel-like base are assembled and fixed, an acrylic plate is inserted into a groove of the channel steel-like base, an inserting sheet baffle plate is inserted into a corresponding slot position, and a 50mm multiplied by 50mm coal sample is placed in the middle position;
(2) The pressure box and the acoustic emission sensing probe are placed at corresponding positions in the pouring space and are fixed, the spring nut is screwed, the spring with smaller elastic coefficient is arranged at the upper part of the spring nut, the acoustic emission sensing probe is always contacted with a rock sample through elasticity, acoustic emission and the rock sample are prevented from being separated from contact due to deformation of the rock sample, and then data are wrong;
(3) Sealing gaps between the acoustic emission sensing probe on the channel-like steel base and the data line and the leading-out hole of the pressure box by sealing cement, removing the inserted sheet baffles on two sides of the rock sample, and fixing the pressure box on the coal wall;
(4) Uniformly preparing slurry according to the paste ratio to be researched, pouring a proper amount of paste slurry into a pouring space of the assembled channel-like steel base when initial setting is not reached, until the slurry is as high as the inserting sheet baffle, slightly oscillating, reducing bubbles in the slurry, and enabling the slurry to be more uniform in the device;
(5) When the slurry reaches initial setting, slowly pulling out all the insert baffles, taking out the acrylic plate, placing a cast test piece and a channel steel-like base at a dry ventilation place, and maintaining for 15 days indoors;
(6) After curing, spraying speckle on the surface of the test piece, and calibrating by using a speckle calibration plate, so that the subsequent observation by using a digital image correlation technique is facilitated;
(7) Reinserting an acrylic plate into a groove of a channel-like steel base, scattering a layer of fine sand above a test piece to ensure that the test piece is uniformly stressed, placing a loading head above the test piece, grabbing handles of a left baffle plate and a right baffle plate, and placing channel-like steel base equipment on a loading table of a single-shaft testing machine;
(8) Connecting an acoustic emission sensing probe to an acoustic emission host, connecting a pressure box to a strain gauge, and completing connection of the strain gauge and a stress monitoring host;
(9) Loading by using a single-axis testing machine, and monitoring and recording the plane strain in real time by using a DIC;
(10) After the first test is finished, rock materials on the channel-like steel base are cleaned, the steps (1) to (9) are repeated, the placement positions of the coal samples and the placement quantity of the coal samples are changed in the step (2), namely, the quantity and the positions of the filling bodies and the coal are changed, and the quantity and the positions of the pressure boxes can be increased in the step (3) so as to realize the mechanical property research of combined samples and the space-time evolution rule of cracks under different sequence conditions;
(11) And (3) changing the step (7), after the equipment is placed on a loading table of the single-shaft testing machine, detaching the left baffle plate and the right baffle plate, and continuing the test according to the steps, so that the in-situ loading of the sample under the unconstrained condition can be realized.
The invention has the remarkable technical effects due to the adoption of the technical scheme: (1) The device can realize the production of the coal and filler combined body test piece for many times, and simulate the mechanical properties and the destruction form of the combined body under different mining and filling sequences by changing the positions of the coal and the filler; the mechanical properties and the destruction morphology of absolute constraint and weak constraint of the middle coal pillar to be researched can be realized by changing whether left and right baffles exist or not; (2) The device is also added with an acoustic emission monitoring system, and in order to better enable the acoustic emission probe to be closely attached to a test piece to be researched in the test process, a spring nut is used at the base position, so that the spring can always enable the acoustic emission probe to be closely attached to the test piece no matter how the test piece deforms under pressure, erroneous results are prevented from being generated in the test, and the accurate acquisition of a crack space-time evolution rule is better realized; (3) The device is also added with a stress monitoring system, the change of vertical stress and the change of transverse stress can be monitored through the pressure box, the evolution of a stress field in a test piece is monitored at any time, and the mechanical properties of coal in the coal and filler combination are accurately obtained.
Drawings
FIG. 1 is a schematic diagram of a coal-filler material combination sample preparation and loading test apparatus according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present invention and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a specific azimuth, and are configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, connected via an intermediary, or connected by communication between 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.
As shown in fig. 1, the test device for manufacturing and loading the coal-filling material combined sample comprises an acrylic plate 9, a loading head 8, an inserting sheet baffle 7, a channel-like steel base 3, a left baffle 4, a right baffle 5, a spring nut 2, a stress monitoring system and an acoustic emission monitoring system, wherein the stress monitoring system comprises a pressure box 6, the acoustic emission monitoring system comprises a 1 acoustic emission sensing probe, the left side of the channel-like steel base 3 is provided with the left baffle 4, the right side of the channel-like steel base 3 is provided with the right baffle 5, the front side of the channel-like steel base 3 is provided with an observation window, the inner side of the observation window is provided with the acrylic plate 9, a plurality of slots are formed in the inner side of the acrylic plate 9, the inserting sheet baffle 7 is arranged in the slots, the inserting sheet baffle 7 is used for dividing the channel-like steel base 3 into a plurality of pouring spaces, the bottom of the pouring spaces is provided with the spring nut 2, the acoustic emission sensing probe 1 is arranged on the spring 2, the pressure box 6 is arranged on the side wall of a coal sample, and the loading head 8 is arranged above the pouring spaces.
The left baffle 4 is detachably connected to the left side of the channel steel-like base 3 through bolts;
the right baffle 5 is detachably connected to the right side of the channel steel-like base 3 through bolts;
a left handle is arranged on one side of the left baffle 4;
a right handle is arranged on one side of the right baffle 5;
the channel-like steel base 3 is provided with a guiding-out hole, and the acoustic emission sensing probe and the data line of the pressure box 6 are guided out of the channel-like steel base 3 through the guiding-out hole.
The stress monitoring system comprises a pressure box 6, a strain gauge, a stress monitoring host and a display screen, wherein the pressure box 6 is one type of stress monitoring device, the pressure box 6 is connected with the strain gauge, and the strain gauge is connected with the stress monitoring host and the display screen;
the acoustic emission monitoring system comprises an acoustic emission sensing probe 1, an acoustic emission host and an acoustic emission display screen, wherein the acoustic emission sensing probe 1 is connected with the acoustic emission host, and the acoustic emission host and the acoustic emission display screen are connected;
the spring nut 2 comprises a nut and a spring, the spring is arranged on the nut, and the spring nut 2 enables the acoustic emission sensing probe 1 to be always in contact with a rock sample through elasticity, so that acoustic emission data errors caused by deformation of the rock sample are prevented.
The method for manufacturing and loading the test sample of the coal-filling material combination comprises the following steps:
(1) First usingThe left baffle plate 4, the right baffle plate 5 and the channel steel-like base 3 are assembled and fixed, the acrylic plate 9 is inserted into a groove of the channel steel-like base 3, the inserting sheet baffle plate 7 is inserted into a corresponding slot position, and a coal sample with the thickness of 50mm multiplied by 50mm is placed in the middle position;
(2) The pressure box 6 and the sound emission induction probe 1 are placed at corresponding positions in the casting space and fixed. The spring nut 2 is screwed, a spring with smaller elastic coefficient is arranged at the upper part of the spring nut 2, and the acoustic emission sensing probe 1 is always contacted with a rock sample through elasticity, so that the acoustic emission data is prevented from being wrong due to the deformation of the rock sample;
(3) Sealing gaps between the acoustic emission sensing probe 1 on the channel-like steel base 3 and the data line and the leading-out hole of the pressure box 6 by sealing cement, removing the inserting sheet baffles 7 on two sides of the rock sample, and fixing the pressure box 6 on the coal wall;
(4) Uniformly preparing slurry according to the paste ratio to be researched, pouring a proper amount of paste slurry into the pouring space of the assembled channel-like steel base 3 when the initial setting is not reached, until the slurry is as high as the inserting sheet baffle 7, slightly oscillating, reducing bubbles in the slurry, and ensuring that the slurry is more uniform in the device;
(5) When the slurry reaches initial setting, slowly pulling out all the insert baffle plates 7, taking out the acrylic plate 9, placing a cast test piece and the channel steel-like base 3 at a dry ventilation place, and maintaining for 15 days indoors;
(6) After curing, spraying speckle on the surface of the test piece, and calibrating by using a speckle calibration plate, so that the subsequent observation by using a digital image correlation technique is facilitated;
(7) Reinserting an acrylic plate 9 into a groove of the channel-like steel base 3, scattering a layer of fine sand above a test piece to ensure that the test piece is uniformly stressed, placing a loading head 8 above the test piece, grabbing handles of the left baffle plate and the right baffle plate 5, and placing the channel-like steel base 3 on a loading table of a single-shaft testing machine;
(8) Connecting the acoustic emission sensing probe 1 to an acoustic emission host, connecting the pressure box 6 to a strain gauge, and completing connection of the strain gauge and a stress monitoring host;
(9) Loading by using a single-axis testing machine, and monitoring and recording the plane strain in real time by using a DIC;
(10) After the first test is finished, rock materials on the channel-like steel base 3 are cleaned, the steps (1) to (9) are repeated, the placement positions of the coal samples and the placement quantity of the coal samples are changed in the step (2), namely, the quantity and the positions of the filling bodies and the coal are changed, and the quantity and the positions of the pressure boxes 6 can be increased in the step (3) so as to realize the mechanical property research of combined samples and the space-time evolution rule of cracks under different sequence conditions;
(11) After the device is placed on a loading table of the single-shaft testing machine, the left baffle plate 4 and the right baffle plate 5 are detached, and the test is continued according to the steps, so that the in-situ loading of the sample under the unconstrained condition can be realized.
The invention relates to a device for manufacturing and loading a coal-filling material combined sample and a using method thereof. In practical engineering, in the process of strip filling mining, coal, filling materials, corresponding supports and the like bear loads together, and the mechanical properties of the coal in the combination of the coal and the filling materials are favorable for accurately knowing the damage form of the coal body under different conditions. Therefore, in order to study the effect of the sequence of strip filling exploitation and the existence of absolute transverse constraint on the mechanical characteristics of a combined sample and the time-space evolution rule of a crack, and to simulate the actual engineering more closely, a visual test device for manufacturing and loading a test piece is needed. The device consists of a manufacturing and loading system (an acrylic plate 9, a loading head 8, an inserting sheet baffle 7, a channel steel-like base 3, a left baffle 4, a right baffle 5 and a spring nut 2), a stress monitoring system (a pressure box 6) and an acoustic emission monitoring system (acoustic emission). Separating the rock sample from the filling material by using the inserting sheet baffle 7, placing the inserting sheets in different sequences before loading, and taking out the inserting sheet baffle 7 before loading; the observation of the plane strain of the coal and the filling material during loading is realized through the acrylic plate 9, and the monitoring can be carried out by using auxiliary equipment DIC; absolute constraint can be realized by whether the left baffle plate and the right baffle plate 5 are present or not; observing the time-space evolution rule of the coal body fracture in the loading process by utilizing the positioning function of acoustic emission; by means of the pressure cell 6 in front of the coal body and the filling material, the course of the interaction stress of different coals and filling materials can be observed. The device is matched with a single-shaft testing machine, in-situ loading can be carried out in the manufacturing device, and corresponding detection equipment is added, so that the study on the mechanical properties of the coal-filling material combined sample and the fracture space-time evolution rule of the coal body is simply and effectively realized.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features of the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples merely illustrate embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. A coal-filling material combined sample preparation, loading test device which is characterized in that: including ya keli board, loading head, inserted sheet baffle, class channel-section steel type base, left baffle, right baffle, spring nut, stress monitoring system, acoustic emission monitoring system, stress monitoring system includes the pressure cell, acoustic emission monitoring system includes acoustic emission inductive probe, class channel-section steel type base left side is provided with left baffle, class channel-section steel type base right side is provided with right baffle, class channel-section steel type base front side is provided with the observation window, the observation window inboard is provided with the ya keli board, the ya keli inboard is provided with a plurality of slots, be provided with the inserted sheet baffle in the slot, the inserted sheet baffle is used for cutting apart a plurality of pouring spaces with class channel-section steel type base, the pouring space bottom is provided with spring nut, be provided with acoustic emission inductive probe on the spring nut, the pressure cell sets up on the coal sample lateral wall, the pouring space top is provided with the loading head.
2. The coal-filling material combined sample preparation and loading test device according to claim 1, wherein the device comprises: the left baffle is detachably connected to the left side of the channel-steel-like base through bolts.
3. The coal-filling material combined sample preparation and loading test device according to claim 1, wherein the device comprises: the right baffle is detachably connected to the right side of the channel-steel-like base through bolts.
4. The coal-filling material combined sample preparation and loading test device according to claim 1, wherein the device comprises: a left handle is arranged on one side of the left baffle plate.
5. The coal-filling material combined sample preparation and loading test device according to claim 1, wherein the device comprises: and a right handle is arranged on one side of the right baffle plate.
6. The coal-filling material combined sample preparation and loading test device according to claim 1, wherein the device comprises: the acoustic emission sensing probe is characterized in that a guide-out hole is formed in the channel-like steel base, and the acoustic emission sensing probe and a data line of the pressure box are guided out of the channel-like steel base through the guide-out hole.
7. An experimental method for manufacturing and loading test devices for coal-filling material combination samples according to any one of claims 1-6, characterized in that: the method comprises the following steps:
(1) First usingThe left baffle plate, the right baffle plate and the channel steel-like base are assembled and fixed by bolts, the acrylic plate is inserted into the groove of the channel steel-like base, and the inserting sheet baffle plate is inserted into the corresponding slotIn the position, a coal sample of 50mm multiplied by 50mm is placed in the middle position;
(2) The pressure box and the acoustic emission sensing probe are placed at corresponding positions in the pouring space and are fixed, the spring nut is screwed, the spring with smaller elastic coefficient is arranged at the upper part of the spring nut, the acoustic emission sensing probe is always contacted with a rock sample through elasticity, acoustic emission and the rock sample are prevented from being separated due to deformation of the rock sample, and data are further wrong;
(3) Sealing gaps between the acoustic emission sensing probe on the channel-like steel base and the data line and the leading-out hole of the pressure box by sealing cement, removing the inserted sheet baffles on two sides of the rock sample, and fixing the pressure box on the coal wall;
(4) Uniformly preparing slurry according to the paste ratio to be researched, pouring a proper amount of paste slurry into a pouring space of the assembled channel-like steel base when initial setting is not reached, until the slurry is as high as the inserting sheet baffle, slightly oscillating, reducing bubbles in the slurry, and enabling the slurry to be more uniform in the device;
(5) When the slurry reaches initial setting, slowly pulling out all the insert baffles, taking out the acrylic plate, placing a cast test piece and a channel steel-like base at a dry ventilation place, and maintaining for 15 days indoors;
(6) After curing, spraying speckle on the surface of the test piece, and calibrating by using a speckle calibration plate, so that the subsequent observation by using a digital image correlation technique is facilitated;
(7) Reinserting an acrylic plate into a groove of a channel-like steel base, scattering a layer of fine sand above a test piece to ensure that the test piece is uniformly stressed, placing a loading head above the test piece, grabbing handles of a left baffle plate and a right baffle plate, and placing channel-like steel base equipment on a loading table of a single-shaft testing machine;
(8) Connecting an acoustic emission sensing probe to an acoustic emission host, connecting a pressure box to a strain gauge, and completing connection of the strain gauge and a stress monitoring host;
(9) Loading by using a single-axis testing machine, and monitoring and recording the plane strain in real time by using a DIC;
(10) After the first test is finished, rock materials on the channel-like steel base are cleaned, the steps (1) to (9) are repeated, the placement positions of the coal samples and the placement quantity of the coal samples are changed in the step (2), namely, the quantity and the positions of the filling bodies and the coal are changed, and the quantity and the positions of the pressure boxes can be increased in the step (3) so as to realize the mechanical property research of combined samples and the space-time evolution rule of cracks under different sequence conditions;
(11) And (3) changing the step (7), after the equipment is placed on a loading table of the single-shaft testing machine, detaching the left baffle plate and the right baffle plate, and continuing the test according to the steps, so that the in-situ loading of the sample under the unconstrained condition can be realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311349088.3A CN117268881A (en) | 2023-10-18 | 2023-10-18 | Coal-filling material combined sample manufacturing and loading test device and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311349088.3A CN117268881A (en) | 2023-10-18 | 2023-10-18 | Coal-filling material combined sample manufacturing and loading test device and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117268881A true CN117268881A (en) | 2023-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311349088.3A Pending CN117268881A (en) | 2023-10-18 | 2023-10-18 | Coal-filling material combined sample manufacturing and loading test device and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117268881A (en) |
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2023
- 2023-10-18 CN CN202311349088.3A patent/CN117268881A/en active Pending
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