CN111879586B - Rapid forming method for rock sample similar material test piece - Google Patents
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- CN111879586B CN111879586B CN202010750286.0A CN202010750286A CN111879586B CN 111879586 B CN111879586 B CN 111879586B CN 202010750286 A CN202010750286 A CN 202010750286A CN 111879586 B CN111879586 B CN 111879586B
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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
- 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
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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
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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
- G01N2001/366—Moulds; Demoulding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention provides a rapid forming method of a rock sample similar material test piece, and relates to the technical field of rock mechanics tests. The rock sample similar material test piece rapid prototyping method adopts a similar material test piece rapid prototyping device, and the similar material test piece rapid prototyping device comprises a die unit and a vibration unit; the method comprises the following steps: step one, assembling and feeding a die; step two, vibrating similar materials; and thirdly, demolding the test piece. The interior of the similar material test piece manufactured by the method is free of bubbles and gaps, the flatness and the compactness are high, and the flatness and the compactness of the similar material test pieces manufactured in batches are consistent, so that the result precision of a subsequent similar simulation test is improved; the molding process of the similar material test piece is simple to operate, manual tamping is not needed, semi-automatic operation is achieved, and molding efficiency is high.
Description
Technical Field
The invention relates to the technical field of rock mechanics tests, in particular to a method for rapidly forming a rock sample similar material test piece.
Background
At present, the complexity of mine exploitation is gradually improved, and along with the development of mine exploitation research, the application and the requirement on similar simulation materials are continuously increased in order to improve the research fineness. The simulation test is an important scientific research means, according to the actual geological condition of the rock stratum of the mine, a test piece is manufactured according to a certain proportion to carry out the simulation test, and the mechanical phenomenon possibly occurring in the prototype and the rule of rock pressure distribution are deduced by utilizing the research result on the model, so that the actual problem in the rock mass engineering production is solved.
The existing standard test piece of similar materials is a cylindrical test piece with the diameter of 50mm and the height of 100mm or a cylindrical test piece with the height-to-diameter ratio of 2. When manufacturing a standard test piece made of similar materials, the similar materials are generally required to be filled into a die, and the die is manually tamped to squeeze out bubbles possibly existing, so that gaps of the die are reduced. However, the operation is not reliable and the speed is low, and the manufactured standard test pieces of similar materials have inconsistent flatness and compactness, and often have more or less gaps, which brings inconvenience to the similar simulation test.
Disclosure of Invention
The invention aims to provide a rapid forming method for a rock sample similar material test piece, which realizes rapid forming of the similar material test piece, and the manufactured similar material test piece has higher flatness and compactness, and the flatness and compactness of the similar material test pieces manufactured in batches are consistent.
In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:
a rock sample similar material test piece rapid prototyping method adopts a similar material test piece rapid prototyping device, and the similar material test piece rapid prototyping device comprises a die unit and a vibration unit; the die unit comprises a base, a top hoop and a sleeve, wherein an elastic piece is arranged at the lower end of the base, a circular groove is formed in the upper end of the base, two lower notches which are vertically penetrated are symmetrically formed in the side wall of the base, a circular clamping hole is formed in the middle of the top hoop, two upper notches which are vertically penetrated are symmetrically formed in the side wall of the top hoop, a sinking groove is formed in one side of the upper notch at the upper end of the top hoop, the space of the sinking groove is communicated with the space of the upper notch, the lower end of the sleeve can be embedded into the circular groove, the side wall of the sleeve is attached to the inner wall of the circular groove, and the upper end of the sleeve can be embedded into the circular clamping hole; the vibration unit comprises a base, supporting springs, a vibration box and a vibrator, wherein the base is connected with the vibration box through the supporting springs, the vibrator is arranged at the bottom of the vibration box, a plurality of vibration grooves are formed in the vibration box, two limiting pins are symmetrically arranged on the inner wall of each vibration groove along the upper edge, and the limiting pins can penetrate through the lower notch and the upper notch;
the method comprises the following steps:
step one, die assembly and feeding
Embedding the lower end of the sleeve into the circular groove, enabling the side wall of the sleeve to be attached to the inner wall of the circular groove, and smearing a layer of release agent on the inner walls of the circular groove and the sleeve;
filling the sleeve with similar materials with a proportion set according to test requirements from the upper end of the sleeve;
embedding the upper end of the sleeve into a circular clamping hole of the top hoop;
step two, vibrating the similar materials
The die unit is placed in a vibrating groove of the vibrating box, a limiting pin sequentially penetrates through the lower notch and the upper notch, an elastic piece is enabled to contact the bottom of the vibrating groove and is compressed, the top hoop is pressed, the top hoop is rotated positively, and the limiting pin is pressed on the sinking groove;
starting the vibrator, and closing the vibrator after the vibrator operates for the set time of the test;
step three, demoulding the test piece
Taking out the die unit from the vibration groove of the vibration box, reversely rotating the top hoop, separating the limiting pin from the sinking groove, jacking the die unit in the process of restoring the elastic piece to be long, enabling the limiting pin to sequentially pass through the upper notch and the lower notch, and detaching the top hoop from the upper end of the sleeve;
and drying the similar materials in the sleeve and the circular groove, forming the similar materials in the sleeve and the circular groove into a similar material test piece after the similar materials are dried, and taking the similar material test piece out of the sleeve and the circular groove.
Preferably, the upper end edge of the sleeve is provided with an assembling sleeve, the outer diameter of the assembling sleeve is smaller than that of the sleeve, and the upper end of the sleeve is provided with an assembling annular surface outside the assembling sleeve;
in the first step, the assembly sleeve is embedded into a circular clamping hole of the top hoop, and the lower surface of the top hoop is contacted with the assembly annular surface.
Preferably, the elastic piece is provided with a pressure spring and a supporting pad, one end of the pressure spring is connected with the lower end of the base, and the other end of the pressure spring is connected with the supporting pad;
in the second step, the supporting pad contacts the bottom of the vibration groove and the pressure spring is compressed;
in the third step, the die unit is jacked up in the process of restoring the original length of the pressure spring.
Preferably, the vibrator is an electric vibrator, a vibration controller is arranged on the electric vibrator, the vibrator controller is used for starting or stopping the electric vibrator, and the vibrator controller is also used for adjusting the amplitude and the frequency of the electric vibrator;
and step two, in the time course from the vibrator operation to test setting, the amplitude and the frequency of the electric vibrator are regulated by the vibrator controller.
Preferably, the base is provided with a spring telescopic sleeve, and the supporting spring is positioned in the spring telescopic sleeve.
Preferably, the cross section of the vibration groove is square.
Preferably, the similar material test piece is a cylindrical test piece with the diameter of 50mm and the height of 100mm or a cylindrical test piece with the height-to-diameter ratio of 2.
The beneficial technical effects of the invention are as follows:
according to the rapid forming method for the rock sample similar material test piece, the manufactured similar material test piece has no bubbles and gaps, the flatness and compactness are high, and the flatness and compactness of the similar material test pieces manufactured in batches are consistent, so that the result precision of the follow-up similar simulation test is improved; the molding process of the similar material test piece is simple to operate, manual tamping is not needed, semi-automatic operation is achieved, and molding efficiency is high.
Drawings
FIG. 1 is a flow chart of a method for rapid prototyping of a sample of similar material to a rock sample in accordance with an embodiment of the present invention;
FIG. 2 is a schematic structural view of a mold unit in a rapid prototyping apparatus for test pieces of similar materials in accordance with one embodiment of the present invention, wherein the components of the mold unit are in a non-assembled state;
FIG. 3 is a schematic diagram showing the structure of a vibration unit in a rapid prototyping apparatus for test pieces of similar materials in accordance with the embodiments of the present invention;
fig. 4 is a schematic structural diagram of a rapid prototyping apparatus for test pieces of similar materials in accordance with an embodiment of the present invention.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantageous effects of the present invention more apparent. Some embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Indeed, various embodiments of the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inner", "outer", "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of 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 constructed 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 relative importance.
The method for rapid prototyping of a rock sample-like material test piece of this embodiment is shown in fig. 1 to 4.
A rock sample similar material test piece rapid prototyping method adopts a similar material test piece rapid prototyping device, and the similar material test piece rapid prototyping device comprises a die unit and a vibration unit.
The die unit comprises a base 11, a top hoop 12 and a sleeve 13, wherein the outer contour of the base 11 is circular, the top hoop 12 is circular, the sleeve 13 penetrates up and down, and the outer contour of the sleeve 13 is cylindrical. The lower end of the base 11 is provided with an elastic member, which can be compressed or restored to the original length state. The upper end of the base 11 is provided with a circular groove 111, the side wall of the base 11 is provided with two lower notches 31, and the two lower notches 31 are communicated up and down and are symmetrically arranged. The middle position of the top hoop 12 is provided with a circular clamping hole 121, the side wall of the top hoop 12 is provided with two upper notches 32, and the two upper notches 32 are communicated up and down and are symmetrically arranged. The upper end of the top hoop 12 is provided with a sinking groove 33 at one side of the upper notch 32, and the space of the sinking groove 33 is communicated with the space of the upper notch 32. The lower end of the sleeve 13 can be embedded into the circular groove 111, the side wall of the sleeve 13 is attached to the inner wall of the circular groove 111, and the upper end of the sleeve 13 can be embedded into the circular clamping hole 121. The upper end edge of the sleeve 13 is provided with a fitting sleeve 131, the outer diameter of the fitting sleeve 131 is smaller than that of the sleeve 13, and the upper end of the sleeve 13 is provided with a fitting annular surface 132 outside the fitting sleeve 131.
The elastic member in this embodiment is provided as a compression spring 141 and a support pad 142, one end of the compression spring 141 is connected to the lower end of the base 11, and the other end of the compression spring 141 is connected to the support pad 142.
The vibration unit includes a base 21, a support spring 22, a vibration box 23, and a vibrator 24. The base 21 is connected with the vibrating box 23 through four supporting springs 22, a vibrator 24 is arranged on the outer side of the bottom of the vibrating box 23, four vibrating grooves 231 are formed in the vibrating box 23, two limiting pins 4 are symmetrically arranged on the inner wall of each vibrating groove 231, and the limiting pins 4 can penetrate through the lower notch 31 and the upper notch 32.
The base 21 is provided with a spring telescopic sleeve 211, the supporting spring 22 is located in the spring telescopic sleeve 211, the vibrator 24 drives the vibration box 23 to vibrate, the supporting spring 22 stretches or retracts along with the vibration box, the supporting spring 22 stretches or retracts, the spring telescopic sleeve 211 is used for guiding the supporting spring 22 in the stretching and retracting process, the supporting spring 22 is prevented from being too inclined, and further the vibration box 23 is prevented from being too inclined to damage a similar material test piece in the die unit.
The cross-sections of the base 11, the top hoop 12 and the sleeve 13 of the mould unit are circular, and the cross-section of the vibration groove 231 is square. Spaces are left between the mold unit and the four corners of the vibration groove 231, so that the mold unit can be conveniently placed in the vibration groove 231 of the vibration box 23, and the mold unit can be conveniently taken out of the vibration groove 231 of the vibration box 23.
The vibrator 24 is provided as an electric vibrator on which a vibration controller is provided for turning on or off the electric vibrator, and for adjusting the amplitude and frequency of the electric vibrator.
The method comprises the following steps:
step one, die assembly and feeding
As shown in fig. 2, the lower end of the sleeve 13 is embedded into the circular groove 111, so that the side wall of the sleeve 13 is attached to the inner wall of the circular groove 111, and a layer of oil release agent is smeared on the inner walls of the circular groove 111 and the sleeve 13;
filling the sleeve 13 with similar materials in a proportion set according to test requirements from the upper end of the sleeve 13, wherein the amount of the similar materials added each time is 1/20 to 1/10 of the total amount of the similar materials;
the upper end of the sleeve 13 is embedded into the circular clamping hole 121 of the top hoop 12, in particular, the assembly sleeve 131 is embedded into the circular clamping hole 121 of the top hoop 12, the lower surface of the top hoop 12 contacts the assembly annular surface 132, so that the top hoop 12 can be detachably connected with the upper end of the sleeve 13, the bottom of the vibration groove 231 is compressed by matching with the elastic piece, the assembly connection of the top hoop 12 and the sleeve 13 is firm, and the top hoop 12 and the sleeve 13 are prevented from falling off during subsequent vibration of similar materials.
Step two, vibrating the similar materials
As shown in fig. 3 and 4, the mold unit (including similar materials) is placed in the vibration groove 231 of the vibration box 23, the limiting pin 4 sequentially passes through the lower notch 31 and the upper notch 32, the supporting pad 142 of the elastic member contacts the bottom of the vibration groove 231 and the compression spring 141 of the elastic member is compressed, the top hoop 12 is pressed and the top hoop 12 is rotated forward, and the limiting pin 4 is pressed on the sinking groove 33;
starting the vibrator 24, and adjusting the amplitude and the frequency of the electric vibrator through the vibrator controller during the period from the operation of the vibrator 24 to the test setting;
after the vibrator 24 was operated for the set time for the test (the similar material of this example is coal mine filling material for 40s to 60 s), the vibrator 24 was turned off.
Step three, demoulding the test piece
Taking out the die unit from the vibration groove 231 of the vibration box 23, reversely rotating the top hoop 12, separating the limit pin 4 from the sinking groove 33, jacking the die unit in the process of recovering the original length of the pressure spring 141 of the elastic piece, enabling the limit pin 4 to sequentially pass through the upper notch 32 and the lower notch 31, and detaching the top hoop 12 from the upper end of the sleeve 13;
placing the sleeve 13, the base 11 and similar materials in the sleeve 13 and the circular groove 111 in a drying oven, setting the temperature of the drying oven to be 70 ℃ for 24 hours, drying the similar materials in the sleeve 13 and the circular groove 111, forming the similar materials in the sleeve 13 and the circular groove 111 into similar material test pieces after the similar materials are dried, and taking the similar material test pieces out of the sleeve 13 and the circular groove 111.
It should be noted that, similar materials in the sleeve 13, the base 11, the sleeve 13 and the circular groove 111 occupy smaller space in the drying box, and the whole rapid prototyping device for the similar material test piece is not required to be placed in the drying box; in addition, the vibration unit of the rapid prototyping apparatus for test pieces of similar materials can be continuously used for the test. Thus, the method of the embodiment is more suitable for mass production of test pieces made of similar materials.
The similar material test piece manufactured by the rock sample similar material test piece rapid prototyping method of the embodiment is a similar material standard test piece, is a cylindrical test piece with the diameter of 50mm and the height of 100mm, or is a cylindrical test piece with the height-diameter ratio of 2.
The present embodiment has been described in detail with reference to the accompanying drawings. From the above description, a person skilled in the art should clearly know a method for rapid prototyping of a rock sample-like material specimen according to the present invention. The interior of the similar material test piece manufactured by the method is free of bubbles and gaps, the flatness and the compactness are high, and the flatness and the compactness of the similar material test pieces manufactured in batches are consistent, so that the result precision of a subsequent similar simulation test is improved; the molding process of the similar material test piece is simple to operate, manual tamping is not needed, semi-automatic operation is achieved, and molding efficiency is high.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (7)
1. A rapid prototyping method for a rock sample similar material test piece is characterized in that a rapid prototyping device for the similar material test piece is adopted, and the rapid prototyping device for the similar material test piece comprises a die unit and a vibration unit; the die unit comprises a first base, a top hoop and a sleeve, wherein an elastic piece is arranged at the lower end of the first base, a circular groove is formed in the upper end of the first base, two lower notches which are vertically penetrated are symmetrically formed in the side wall of the first base, a circular clamping hole is formed in the middle position of the top hoop, two upper notches which are vertically penetrated are symmetrically formed in the side wall of the top hoop, a sinking groove is formed in one side of the upper notch at the upper end of the top hoop, the space of the sinking groove is communicated with the space of the upper notch, the lower end of the sleeve can be embedded into the circular groove, the side wall of the sleeve is attached to the inner wall of the circular groove, and the upper end of the sleeve can be embedded into the circular clamping hole; the vibration unit comprises a second base, supporting springs, a vibration box and a vibrator, wherein the second base is connected with the vibration box through the supporting springs, the vibrator is arranged at the bottom of the vibration box, a plurality of vibration grooves are formed in the vibration box, two limiting pins are symmetrically arranged on the inner wall of each vibration groove along the edge, and the limiting pins can penetrate through the lower notch and the upper notch;
the method comprises the following steps:
step one, die assembly and feeding
Embedding the lower end of the sleeve into the circular groove, enabling the side wall of the sleeve to be attached to the inner wall of the circular groove, and smearing a layer of release agent on the inner walls of the circular groove and the sleeve;
filling the sleeve with similar materials with a proportion set according to test requirements from the upper end of the sleeve;
embedding the upper end of the sleeve into a circular clamping hole of the top hoop;
step two, vibrating the similar materials
The die unit is placed in a vibrating groove of the vibrating box, a limiting pin sequentially penetrates through the lower notch and the upper notch, an elastic piece is enabled to contact the bottom of the vibrating groove and is compressed, the top hoop is pressed, the top hoop is rotated positively, and the limiting pin is pressed on the sinking groove;
starting the vibrator, and closing the vibrator after the vibrator operates for the set time of the test;
step three, demoulding the test piece
Taking out the die unit from the vibration groove of the vibration box, reversely rotating the top hoop, separating the limiting pin from the sinking groove, jacking the die unit in the process of restoring the elastic piece to be long, enabling the limiting pin to sequentially pass through the upper notch and the lower notch, and detaching the top hoop from the upper end of the sleeve;
and drying the similar materials in the sleeve and the circular groove, forming the similar materials in the sleeve and the circular groove into a similar material test piece after the similar materials are dried, and taking the similar material test piece out of the sleeve and the circular groove.
2. The method for rapidly forming a rock sample-like material specimen according to claim 1, wherein: the upper end edge of the sleeve is provided with an assembling sleeve, the outer diameter of the assembling sleeve is smaller than that of the sleeve, and the upper end of the sleeve is provided with an assembling annular surface outside the assembling sleeve;
in the first step, the assembly sleeve is embedded into a circular clamping hole of the top hoop, and the lower surface of the top hoop is contacted with the assembly annular surface.
3. The method for rapidly forming a rock sample-like material specimen according to claim 1, wherein: the elastic piece is arranged into a pressure spring and a supporting pad, one end of the pressure spring is connected with the lower end of the first base, and the other end of the pressure spring is connected with the supporting pad;
in the second step, the supporting pad contacts the bottom of the vibration groove and the pressure spring is compressed;
in the third step, the die unit is jacked up in the process of restoring the original length of the pressure spring.
4. The method for rapidly forming a rock sample-like material specimen according to claim 1, wherein: the vibrator is arranged as an electric vibrator, a vibration controller is arranged on the electric vibrator, the vibrator controller is used for starting or closing the electric vibrator, and the vibrator controller is also used for adjusting the amplitude and the frequency of the electric vibrator;
and step two, in the time course from the vibrator operation to test setting, the amplitude and the frequency of the electric vibrator are regulated by the vibrator controller.
5. The method for rapidly forming a rock sample-like material specimen according to claim 1, wherein: the second base is provided with a spring telescopic sleeve, and the supporting spring is positioned in the spring telescopic sleeve.
6. The method for rapidly forming a rock sample-like material specimen according to claim 1, wherein: the cross section of the vibration groove is square.
7. The method for rapidly forming a rock sample-like material specimen according to claim 1, wherein: the similar material test piece is a cylindrical test piece with the diameter of 50mm and the height of 100mm or a cylindrical test piece with the height-diameter ratio of 2.
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| CN202010750286.0A CN111879586B (en) | 2020-07-30 | 2020-07-30 | Rapid forming method for rock sample similar material test piece |
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| CN202010750286.0A CN111879586B (en) | 2020-07-30 | 2020-07-30 | Rapid forming method for rock sample similar material test piece |
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| CN113933139B (en) * | 2021-09-29 | 2024-03-26 | 中国地质大学（武汉） | Rock similar material sample preparation mold and sample preparation method |
| CN114166614B (en) * | 2021-12-16 | 2024-01-02 | 广西大学 | Two-way movable manufacturing die and method for rock sample of similar material in diagenetic geothermal environment |
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| CN105666642A (en) * | 2016-03-11 | 2016-06-15 | 长江航务工程质量监督中心站 | Dry and hard concrete sample forming machine equipment |
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| CN110567770A (en) * | 2019-09-09 | 2019-12-13 | 青岛科技大学 | Rapid forming equipment and forming method for standard similar material test piece |
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2020
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| EP1201297A1 (en) * | 2000-10-31 | 2002-05-02 | Helmut Dipl.-Ing. Herz | Shaking apparatus for sample vessels |
| CN105666642A (en) * | 2016-03-11 | 2016-06-15 | 长江航务工程质量监督中心站 | Dry and hard concrete sample forming machine equipment |
| CN206321491U (en) * | 2016-12-22 | 2017-07-11 | 江苏四通路桥工程有限公司 | A kind of Vibration compaction machine |
| CN110567770A (en) * | 2019-09-09 | 2019-12-13 | 青岛科技大学 | Rapid forming equipment and forming method for standard similar material test piece |
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| 深部巷道围岩变形损伤机理及破裂演化规律研究;许国安;《中国博士学位论文全文数据库》;20110815;全文 * |
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