CN112525629A - Mold and method for manufacturing coal-rock combination analog simulation experiment test piece - Google Patents
Mold and method for manufacturing coal-rock combination analog simulation experiment test piece Download PDFInfo
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- CN112525629A CN112525629A CN202011021687.9A CN202011021687A CN112525629A CN 112525629 A CN112525629 A CN 112525629A CN 202011021687 A CN202011021687 A CN 202011021687A CN 112525629 A CN112525629 A CN 112525629A
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention provides a coal-rock combination similar simulation test piece manufacturing mold and a method. Compared with the prior art, the method has the following advantages: according to the preset parameters of the similar simulation model, the similar simulation experiment test block models with different rock stratum inclination angles are manufactured; the method is simple, the manufacturing speed is high, the quality of the test piece is high, and the compactness and the flatness of the manufactured model can meet the experimental requirements of a similar simulation experiment.
Description
Technical Field
The invention relates to a similar simulation test block manufacturing die, in particular to a manufacturing die of a similar simulation research test block for deformation damage and stable control of a coal mine half-coal rock roadway.
Background
In recent years, with the deep development of researches on deformation failure mechanism and stability control mechanism of the half coal rock roadway, the roadway side is a well-known weak link for controlling the half coal rock roadway. The mechanical property of the deep well semi-coal roadway wall is continuously deteriorated during tunneling and stoping, and the wall deformation shows the characteristic of large deformation along the shearing slip of the coal rock structural surface. The large deformation of the deep well half-coal roadway slope is the result of the roadway slope strength attenuation caused by further increasing mining stress during the mining period and stress concentration during the tunneling period. When a coal-rock composite body analog simulation experiment is carried out, most researchers make coal-rock composite body samples by simply horizontally combining coal bodies and rock test pieces. In fact, the coal rock mass has a large number of defects such as microcracks, holes and the like randomly distributed in the coal rock mass, a certain transition exists in the coal rock layer at the joint surface, and the physical and mechanical behaviors of the coal rock material are very complex and discrete. Therefore, in the process of preparing the standard rock mechanics test piece of the coal-rock composite, the excessive characteristics of the coal-rock structural plane and the occurrence characteristics of microcracks or pores in the coal rock body need to be considered. In order to better reduce and simulate the deformation damage process of the half coal-rock roadway and further develop the research on the deformation damage mechanism and the stability control mechanism of the half coal-rock roadway, the device and the method for manufacturing the coal-rock composite body similar simulation test piece are particularly provided.
Disclosure of Invention
In order to solve the technical problem, the invention provides a test piece manufacturing mold and a method for a coal-rock combination similarity simulation test, wherein the test piece manufacturing mold comprises a bottom tray, a front side plate, a rear side plate, a left side plate, a right side plate and a thin partition plate inserted into a test piece manufacturing device; the bottom tray is provided with four side plates along each side of a small-size steel plate, small protruding plates on the left side plate and the right side plate penetrate through rectangular small holes in the front side plate and the rear side plate, then a screw penetrates through the front side plate and the rear side plate to be connected with nuts welded on the left side plate and the right side plate, and finally a thin partition plate is inserted along a small gap pre-processed in the side plates.
The concrete manufacturing steps of the test piece are as follows:
the method comprises the following steps: determining the strength of each component of a coal-rock composite test piece according to the uniaxial compression capacity of a rock mechanics uniaxial compression experiment in engineering practice, determining the proportion of the composite test piece and the angle of a joint surface according to the field condition, searching for a similar simulation experiment material ratio which accords with the condition that the strength of each component of the composite test piece is proper through a test fork method and the uniaxial compression experiment, and then utilizing the material ratioBy the formula
Calculating the mass of 20-40 mesh coal powder, sand below 10 mesh, 425 cement and water required in the preparation of each component of the similar simulation experiment test piece;
step two: assembling a test piece manufacturing device, assembling four-circumference side plates on a bottom tray along each side of a small-size steel plate, enabling small protruding plates on a left side plate and a right side plate to penetrate through rectangular small holes in a front side plate and a rear side plate, then enabling screw rods to penetrate through the front side plate and the rear side plate to be connected with nuts welded on the left side plate and the right side plate, and finally inserting a thin partition plate along a small gap pre-processed on the side plates according to the ratio of the two components of the coal-rock composite test piece determined in the step one and;
step three: weighing the component materials of the combined test piece according to the mass of the component materials of the test piece obtained by calculation in the step one, respectively stirring the coal powder and the cement of the coal part and the sand and the cement of the rock part uniformly, and then adding water with certain mass according to the proportion and then mixing and stirring;
step four: after the materials of all components of the combined body test piece are uniformly stirred, respectively adding the materials with the two components mixed and stirred into corresponding positions in a manufacturing device, and tamping the materials by adopting a vibration and stick pressing method while adding the materials; after all materials fill the mold to form a test piece, drawing out the thin partition board inserted along the small gap pre-processed on the side plate, and finishing the surface of the test piece in the mold by using a tuck-in device to enable the test piece to be flat and smooth;
step five: and standing the trimmed test piece in the mold for 8-12 hours, detaching all side plates of the mold after the test piece of the assembly has certain strength, and maintaining the test piece in a thermostat for 28 days.
The bottom tray, the front side plate, the rear side plate, the left side plate, the right side plate and the thin partition plate are all made of steel plates.
The bottom tray is formed by welding two steel plates with different sizes, the size of the small-size steel plate is 200mm x 200mm, and the side length of the large-size steel plate is 20mm larger than that of the small-size steel plate.
The front side plate and the rear side plate are made of steel plates through cutting processing, and the shapes and the sizes of the front side plate and the rear side plate are the same and are both 220mm by 200 mm; and a rectangular small hole with the size of 3 mm x 10 mm is dug at two positions 20mm away from the edge on two parallel sides with the side length of 220 mm.
The left side plate and the right side plate are made of steel plates through cutting, and the left side plate and the right side plate are identical in shape and size and are both 200mm by 200 mm; and a small protruding rectangular plate with the size of 3 mm x 10 mm is arranged at two positions 40 mm away from the end point on two parallel sides.
The thin partition plate is made of a steel plate with the thickness of 1mm, and the size of the thin partition plate is determined according to the proportion of the coal-rock combination body and the inclination angle of the contact surface of the combination body in the manufacturing process of the test piece.
Drawings
The invention is described in further detail below with reference to the accompanying drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a bottom tray;
FIG. 3 is a schematic structural view of the front and rear side plates;
fig. 4 is a schematic structural view of the left and right side plates.
Detailed Description
The invention provides a mould and a method for manufacturing a test piece of a coal-rock combination similarity simulation test, wherein the test piece manufacturing device comprises a bottom tray 1, a front side plate 2, a rear side plate 3, a left side plate 4, a right side plate 5 and a thin partition plate 6 inserted into the test piece manufacturing device; four-circumference side plates are assembled on the bottom tray 1 along each side of a small-sized steel plate 7, small protruding plates 12 on the left side plate and the right side plate penetrate through rectangular small holes 8 on the front side plate and the rear side plate, then a screw rod 9 penetrates through the front side plate and the rear side plate to be connected with screw caps 10 welded on the left side plate and the right side plate, and finally a thin partition plate 6 is inserted along a small gap 11 pre-processed on the side plates.
The concrete manufacturing steps of the test piece are as follows:
the method comprises the following steps: determining the strength of each component of a coal-rock composite test piece according to the uniaxial compression capacity of a rock mechanics uniaxial compression experiment in engineering practice, determining the proportion of the composite test piece and the angle of a joint surface according to the field condition, and searching for a similar simulation real model meeting the condition that the strength of each component of the composite test piece is proper through a test fork method and a uniaxial compression experimentTesting the material ratio and then using the formula
Calculating the mass of 20-40 mesh coal powder, sand below 10 mesh, 425 cement and water required in the preparation of each component of the similar simulation experiment test piece;
step two: assembling a test piece manufacturing device, assembling four-circumference side plates on a bottom tray 1 along each side of a small-size steel plate 7, enabling small protruding plates 12 on a left side plate and a right side plate to penetrate through rectangular small holes 8 on a front side plate and a rear side plate, then enabling screw rods 9 to penetrate through the front side plate and the rear side plate to be connected with screw caps 10 welded on the left side plate and the right side plate, and finally inserting a thin partition plate 6 along a small gap 11 pre-processed on the side plates according to the ratio of two components of the test piece of the coal-rock combination body and the;
step three: weighing the component materials of the combined test piece according to the mass of the component materials of the test piece obtained by calculation in the step one, respectively stirring the coal powder and the cement of the coal part and the sand and the cement of the rock part uniformly, and then adding water with certain mass according to the proportion and then mixing and stirring;
step four: after the materials of all components of the combined body test piece are uniformly stirred, respectively adding the materials with the two components mixed and stirred into corresponding positions in a manufacturing device, and tamping the materials by adopting a vibration and stick pressing method while adding the materials; after all materials fill the die to form a test piece, drawing out the thin partition plate 6 inserted along the small gap 11 pre-processed on the side plate, and finishing the surface of the test piece in the die by using a sipping device to enable the surface to be smooth;
step five: and standing the trimmed test piece in the mold for 8-12 hours, detaching all side plates of the mold after the test piece of the assembly has certain strength, and maintaining the test piece in a thermostat for 28 days.
The bottom tray 1, the front side plate 2, the rear side plate 3, the left side plate 4, the right side plate 5 and the thin partition plate 6 are all made of steel plates.
The bottom tray 1 is formed by welding two steel plates with different sizes, the size of the small-size steel plate 7 is 200mm x 200mm, and the side length of the large-size steel plate is 20mm larger than that of the small-size steel plate.
The front side plate 2 and the rear side plate 3 are made of steel plates through cutting processing, and the shapes and the sizes of the front side plate and the rear side plate are the same, namely 220mm by 200 mm; and a rectangular small hole 8 with the size of 3 mm x 10 mm is dug at two positions 20mm away from the edge on two parallel sides with the side length of 220 mm.
The left side plate 3 and the right side plate 4 are made of steel plates through cutting, and the shapes, the sizes and the sizes of the left side plate and the right side plate are the same and are both 200mm by 200 mm; and a small protruding rectangular plate 12 of 3 mm x 10 mm was placed on two parallel sides 40 mm from the end point.
The thin partition plate 6 is made of a steel plate with the thickness of 1mm, and the size of the thin partition plate is determined according to the proportion of the coal-rock combination body and the inclination angle of the contact surface of the combination body in the manufacturing process of the test piece.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be made by those skilled in the art without inventive work within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (2)
1. A coal-rock combination analog simulation experiment test piece manufacturing mold and a method thereof are disclosed, the test piece manufacturing mold comprises a bottom tray (1), a front side plate (2), a rear side plate (3), a left side plate (4), a right side plate (5) and a thin partition plate (6) inserted into a test piece manufacturing device; assembling four-circumference side plates on a bottom tray (1) along each side of a small-size steel plate (7), enabling small protruding plates (12) on the left side plate and the right side plate to penetrate through rectangular small holes (8) on the front side plate and the rear side plate, then enabling screw rods (9) to penetrate through the front side plate and the rear side plate to be connected with screw caps (10) welded on the left side plate and the right side plate, and finally inserting a thin partition plate (6) along a small gap (11) pre-processed on the side plates;
the concrete manufacturing method of the test piece comprises the following steps:
the method comprises the following steps: determining the strength of each component of a coal-rock composite test piece according to the uniaxial compression capacity of a rock mechanics uniaxial compression experiment in engineering practice, and determining the ratio of the composite test piece according to the field conditionThe angle of the sample and the joint surface is obtained by searching the mixture ratio of the similar simulation experiment materials which are in accordance with the combination test piece and have proper component strength through a test fork method and a uniaxial compression experiment, and then utilizing a formula
Calculating the mass of 20-40 mesh coal powder, sand below 10 mesh, 425 cement and water required in the preparation of each component of the similar simulation experiment test piece;
step two: assembling a test piece manufacturing device, assembling four-circumference side plates on a bottom tray (1) along each side of a small-size steel plate (7), enabling small protruding plates (12) on a left side plate and a right side plate to penetrate through rectangular small holes (8) in a front side plate and a rear side plate, then enabling screws (9) to penetrate through the front side plate and the rear side plate to be connected with nuts (10) welded on the left side plate and the right side plate, and finally inserting a thin partition plate (6) along a small gap (11) pre-processed in the side plates according to the ratio of two components of the coal-rock composite test piece determined in the step one and the angle;
step three: weighing the component materials of the combined test piece according to the mass of the component materials of the test piece obtained by calculation in the step one, respectively stirring the coal powder and the cement of the coal part and the sand and the cement of the rock part uniformly, and then adding water with certain mass according to the proportion and then mixing and stirring;
step four: after the materials of all components of the combined body test piece are uniformly stirred, respectively adding the materials with the two components mixed and stirred into corresponding positions in a manufacturing device, and tamping the materials by adopting a vibration and stick pressing method while adding the materials; after all materials fill the die to form a test piece, drawing out the thin partition plate (6) inserted along the small gap (11) pre-processed on the side plate, and finishing the surface of the test piece in the die by using a sipping device to enable the surface of the test piece to be flat and smooth;
step five: and standing the trimmed test piece in the mold for 8-12 hours, detaching all side plates of the mold after the test piece of the assembly has certain strength, and maintaining the test piece in a thermostat for 28 days.
2. The mold and the method for manufacturing the coal-rock combination analog simulation experiment test piece according to claim 1 are characterized in that: the bottom tray (1), the front side plate (2), the rear side plate (3), the left side plate (4), the right side plate (5) and the thin partition plate (6) are all made of steel plates; the bottom tray (1) is formed by welding two iron plates with different sizes, the size of the small-size steel plate (7) is 200mm by 200mm, and the side length of the large-size steel plate is 20mm larger than that of the small-size steel plate (7); the front side plate (2) and the rear side plate (3) are made of steel plates through cutting processing, and the shapes and the sizes of the front side plate and the rear side plate are the same and are all 220mm by 200 mm; and digging a rectangular small hole (8) with the size of 3 mm x 10 mm at two positions 20mm away from the edge on two parallel sides with the side length of 220 mm; the left side plate (3) and the right side plate (4) are made of steel plates through cutting, and the shapes, the sizes and the sizes of the left side plate and the right side plate are the same and are both 200mm by 200 mm; and two positions 40 mm away from the end point on two parallel sides are provided with a protruding rectangular small plate (12) with the size of 3 mm x 10 mm; the thin partition plate is made of a steel plate with the thickness of 1mm, and the size of the thin partition plate is determined according to the proportion of the coal-rock combination body and the inclination angle of the contact surface of the combination body in the manufacturing process of the test piece.
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2020
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