AU2019445396A1 - Method for simulating equivalent field soft coal in laboratory - Google Patents
Method for simulating equivalent field soft coal in laboratory Download PDFInfo
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- AU2019445396A1 AU2019445396A1 AU2019445396A AU2019445396A AU2019445396A1 AU 2019445396 A1 AU2019445396 A1 AU 2019445396A1 AU 2019445396 A AU2019445396 A AU 2019445396A AU 2019445396 A AU2019445396 A AU 2019445396A AU 2019445396 A1 AU2019445396 A1 AU 2019445396A1
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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
- 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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- 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
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Abstract
The present invention discloses a method for simulating equivalent field soft coal
in a laboratory, including the following steps: selecting a soft coal sample, recording a
buried depth, and testing and back-calculating a uniaxial compressive strength of raw
coal; determining porosity ni of the raw coal and average water content w of the raw
coal; adding water calculated according to the average water content w of the raw coal
under the mass to selected dry raw coal, and mixing the two evenly; producing a
briquette by pressing according to the buried depth H; determining porosity n2 of the
briquette, and testing the uniaxial compressive strength R of a briquette test piece;
comparing 1Of with R and nj with n2: if 10fz R and n z n2, it is proved that the rate of
water addition for briquette production is appropriate, the parameters are accurate,
and the strength and porosity of the briquette are equivalent to those of the raw coal;
otherwise, increasing or reducing molding water until it is calculated that 1Ofz R and
n1z n2. According to the present invention, equivalent laboratory coal molding can be
performed by fully utilizing the bonding properties and water content of the raw coal,
so that the produced briquette accurately reflects the strength and deformation
characteristics of the soft coal to be studied.
Description
Field of the Invention
The present invention relates to a briquette production method, and in particular, to a method for simulating equivalent field soft coal in a laboratory, belonging to the technical field of coal mining experiments.
Description of Related Art Loose soft coal is a kind of coal that is mostly blocky and granular and is affected by geological structure. The block is easily crushed by hand, has lots of coal particles and an extremely low strength, and thus is difficult to mold after mining. In order to reveal the mechanics and deformation characteristics of underground loose soft coal, the study carrier selected is very important. At the present stage, a large number of tests have been carried out on coal rock for which test samples are easy to be obtained, and fruitful research results have been obtained. However, for loose coal medium, because it is often broken and loose, sampling is extremely difficult, and the processing and molding are even more difficult. Due to the lack of study carriers, experimental study often gets into trouble.
At present, although there are some methods for evaluating the strength of soft coal, such as a firmness coefficient f method, this method is unable to evaluate the deformation characteristics of the soft coal. However, the deformation characteristics are key indexes that reflect the properties of the soft coal, such as large deformation and long-term rheology of soft coal seams, which severely affect the efficient production and mining of coal mines. In addition, the pore structure of the loose coal can also reflect its mechanical strength. Generally, the higher the strength, the lower the porosity; however, the pore characteristics cannot completely characterize the deformation behavior of the soft coal. In order to make a comprehensive evaluation of this type of loose soft coal, including mechanics characteristics and deformation characteristics, it is necessary to construct a test piece that is completely equivalent to the field loose coal in the laboratory, and use the test piece as a carrier for related study.
As a medium for studying the characteristics of coal, briquette has been applied in coal and gas outburst, coal permeability, etc.; however, the briquette used in the laboratory is often crushed coal particles and added with binders such as cement and gypsum. The crushed coal powder and binding materials used have changed the nature of the raw coal to a great extent, and cannot be completely equivalent to the field raw coal.
In conclusion, at present, there is a lack of an integrally molded laboratory test piece for studying the deformation characteristics of loose soft coal. Moreover, at the present stage, the briquette in the laboratory is far from that of the raw coal in properties, and cannot be equivalent to the field raw coal, and therefore, the study effect cannot be guaranteed. Therefore, it is very necessary to propose a method for simulation of highly equivalent field raw coal in a laboratory.
Technical Problem
The object of the present invention is to provide a method for simulating equivalent field soft coal in a laboratory. By means of this method, it is possible to enable the produced briquette to simulate in highly equivalent fashion the characteristics of the field soft coal in a laboratory, and then reflect the strength and deformation characteristics of the soft coal to be studied.
Technical Solution
In order to achieve the above-mentioned object, the present invention adopts a method for simulating equivalent field soft coal in a laboratory, including the following steps:
Si: selection of loose and broken soft coal: selecting a loose and broken coal sample from a newly exposed soft coal seam as raw coal, and recording a buried depth H of the site;
S2: determining a soft coal firmness coefficient f of the selected coal sample according to the national standard GB/T23561.12-2010, and back-calculating the coefficient into uniaxial compressive strength of the raw coal, wherein the uniaxial compressive strength is 1Of;
S3: determining true density T and apparent density A of the raw coal according to GB/T 23561.2-2009 and GB/T 50266-99, and finding the porosity ni of the raw coal according to experimental results;
A the porosity calculation formula being n =(1 -)x100%, wherein T is the true T density, i.e., the density of a coal body excluding pores and fractures, g/cm 3 ; andA is the apparent density, i.e., the density of the coal body including pores and fractures, g/cm 3;
S4: taking raw coal from three different locations in a coal seam hosting range according to GB-23561.6-2009-T, determining a value range Wi-W2 of water contents, and calculating the average w;
S5: air-drying and sieving the raw coal taken in step S1, and screening out coal pieces of a relatively large size to avoid experimental fluctuations;
S6: molding of loose soft coal in a laboratory: a. adding, to the selected dry raw coal, water calculated according to the average water content w of the raw coal under this mass, and mixing the two evenly; b. calculating the corresponding molding pressure of a standard-sized cylindrical test sample according to the buried depth H, the size of the standard-sized cylindrical test sample being Dxh = 50mmx100mm, the molding pressure being P = cr.yH, wherein y is the bulk density of overlying strata of the coal seam, which is generally 25,000 KN/m 3, and r is the radius D/2 of the cylindrical test sample; c. evenly adding the raw coal to which the water is added in step a to a standard-sized cylindrical mold and placing same below a press for pressing according to the molding pressure; c. maintaining the pressure for a certain period of time; and d. placing the molded coal in a natural state for a certain period of time to form a briquette;
S7: determining the height h, diameter D and mass M of the briquette, and calculating the apparent density A I thereof, wherein the true density of the raw coal has been determined in step S3, and calculating the porosity n2 of the briquette accordingly;
A, the porosity of the briquette being n2 =( )x100%, wherein T is the true T density of the raw coal, g/cm 3 ; and A 1 being the apparent density of the briquette, M 3 g/cm ; according to a formula, it is calculated that Z( )2h , wherein M is the
mass of the briquette, g; D is the diameter of a test piece, mm; and h is the height of the test piece, mm;
S8: testing the uniaxial compressive strength R of the briquette test piece; and
S9: comparing 1Of with R and n with n2: if 10f~ R and nI~ n2, it is proved that the rate of water addition for briquette production is appropriate, the parameters are accurate, and the strength and porosity of the briquette are equivalent to those of the raw coal, i.e., the briquette is equivalent to the raw coal; if 1Of> R and ni > n2, step S6 is repeated and molding water is reduced, and steps S7 and S8 are repeated until it is calculated that 1Of~ R and nI~ n2, and the strength and porosity of the briquette are equivalent to those of the raw coal, i.e., the briquette is equivalent to the raw coal; if 1Of< R and ni < n2, step S6 is repeated and the molding water is increased, and steps S7 and S8 are repeated until it is calculated that 10f~ R and nj n2, and the strength and porosity of the briquette are equivalent to those of the raw coal, i.e., the briquette is equivalent to the raw coal.
By means of the above-mentioned method, equivalent field soft coal can be highly simulated, and by determining the physical and mechanical properties of the briquette, the characteristics of the field soft coal can be reflected.
Furthermore, in step S9, if the error between 10f and R is less than 5%, it is considered that the two are equivalent, and if the error between n and n2 is less than 5%, it is considered that the two are equivalent.
Preferably, in step S5, large-particle coal pieces having a diameter of greater than 35 mm are screened out to avoid the impact of breakage of large-particle coal pieces during the molding process on the strength of the molded coal body.
Preferably, in step S6, the pressure is maintained for 20 min in step c; and the molded coal is placed in the natural state for 7 days in step d.
Advantageous Effect
The present invention has the following beneficial effects: 1. molding water is added to a loose coal body dried in a laboratory as a strength regulator according to the value range of water contents of raw coal, no additional synthetic cementing agent is added at all, and the bonding properties and water content of the raw coal are fully utilized to perform equivalent laboratory coal molding, thereby restoring the occurrence state of loose raw coal to the greatest extent. 2. According to this method, by making a briquette and continuously adjusting the rate of water addition, the briquette reaches the physical and mechanical properties of the raw coal, so that the briquette that can be constructed in the laboratory is highly equivalent to the raw coal in strength characteristics and pore characteristics, the reliability is high, and the molded test piece can be used to study the mechanics and deformation characteristics of the loose soft coal, thereby facilitating popularization and application.
FIG.1 is a schematic flowchart of a method for simulating equivalent field soft coal in a laboratory.
DETAILED DESCRIPTION OF THE INVENTION The present invention is further described in detail below with reference to the accompanying drawings.
A method for simulating equivalent field soft coal in a laboratory, as shown in FIG. 1, including the following steps:
Si: selection of loose and broken soft coal: selecting a loose and broken coal sample from a newly exposed soft coal seam as raw coal, and recording a buried depth H of the site;
S2: determining a soft coal firmness coefficient f of the selected coal sample according to the national standard GB/T23561.12-2010, and back-calculating the coefficient into uniaxial compressive strength of the raw coal, wherein the uniaxial compressive strength is 1Of;
S3: determining true density T and apparent density A of the raw coal according to GB/T 23561.2-2009 and GB/T 50266-99, and finding the porosity ni of the raw coal according to experimental results;
A the porosity calculation formula being n =(1- ) x100%, wherein T is the true T density, i.e., the density of a coal body excluding pores and fractures, g/cm 3 ; andA is the apparent density, i.e., the density of the coal body including pores and fractures, g/cm 3;
S4: taking raw coal from three different locations in a coal seam hosting range according to GB-23561.6-2009-T, determining a value range wi-w2 of water contents, and calculating the average w;
the calculation formula of the water content of the raw coal being
wo =( -1)x100%, wherein wo is the water content of the coal sample; M1 is the
mass of a natural water-containing test piece; M2 is the mass of a dried test piece, g; and the fluctuation range of the water content of the raw coal is wl-w2, and the average is w;
S5: air-drying and sieving the raw coal taken in step S1, and screening out coal pieces of a relatively large size to avoid experimental fluctuations;
S6: molding of loose soft coal in a laboratory: a. adding, to the selected dry raw coal, water calculated according to the average water content w of the raw coal under this mass, and mixing the two evenly; b. calculating the corresponding molding pressure of a standard-sized cylindrical test sample according to the buried depth H, the size of the standard-sized cylindrical test sample being Dxh = 50mmx100mm, the molding pressure being P = rr2-yH, wherein y is the bulk density of overlying strata of the coal seam, which is generally 25,000 KN/m3 , and r is the radius D/2 of the cylindrical test sample; c. evenly adding the raw coal to which the water is added in step a to a standard-sized cylindrical mold and placing same below a press for pressing according to the molding pressure; c. maintaining the pressure for a certain period of time; and d. placing the molded coal in a natural state for a certain period of time to form a briquette;
S7: determining the height h, diameter D and mass M of the briquette, and calculating the apparent density A 1thereof, wherein the true density of the raw coal has been determined in step S3, and calculating the porosity n2 of the briquette accordingly; the porosity of the briquette being n2 =(1 -)x100%, wherein T is the true T density of the raw coal, g/cm 3 ; and A 1 being the apparent density of the briquette, M g/cm 3 ;according to a formula, it is calculated that D2 wherein M is the 2 mass of the briquette, g; D is the diameter of a test piece, mm; and h is the height of the test piece, mm;
S8: testing the uniaxial compressive strength R of the briquette test piece; and
S9: comparing 1Of with R and n with n2: if 10f~ R and nj~ n2, it is proved that the rate of water addition for briquette production is appropriate, the parameters are accurate, and the strength and porosity of the briquette are equivalent to those of the raw coal, i.e., the briquette is equivalent to the raw coal; if 1Of> R and ni > n2, step S6 is repeated and molding water is reduced, and steps S7 and S8 are repeated until it is calculated that 10f~ R and nI~ n2, and the strength and porosity of the briquette are equivalent to those of the raw coal, i.e., the briquette is equivalent to the raw coal; if 1Of< R and ni < n2, step S6 is repeated and the molding water is increased, and steps S7 and S8 are repeated until it is calculated that 10f~ R and nj n2, and the strength and porosity of the briquette are equivalent to those of the raw coal, i.e., the briquette is equivalent to the raw coal.
By means of the present method, equivalent field soft coal can be highly simulated, and by determining the physical and mechanical properties of the briquette, the characteristics of the field soft coal can be reflected.
In order to clarify the comparison result of 1Of and R, furthermore, in step S9, if the error between 10f and R is less than 5%, it is considered that the two are equivalent, and if the error between n and n2 is less than 5%, it is considered that the two are equivalent; that is, if either one of the two errors is less than 5%, it is considered that 1Of~ R and n n2. f~
Preferably, in step S5, large-particle coal pieces having a diameter of greater than 35 mm are screened out to avoid the impact of breakage of large-particle coal pieces during the molding process on the strength of the molded coal body.
In order to enable the briquette to have a better molding effect and to be more similar to the field raw coal, preferably, in step S6, the pressure is maintained for 20 min in step c; and the molded coal is placed in the natural state for 7 days in step d.
The present invention has the following beneficial effects: 1. molding water is added to a loose coal body dried in a laboratory as a strength regulator according to the value range of water contents of raw coal, no additional synthetic cementing agent is added at all, and the bonding properties and water content of the raw coal are fully utilized to perform equivalent laboratory coal molding, thereby restoring the occurrence state of loose raw coal to the greatest extent. 2. According to this method, by making a briquette and continuously adjusting the rate of water addition, the briquette reaches the physical and mechanical properties of the raw coal, so that the briquette that can be constructed in the laboratory is highly equivalent to the raw coal in strength characteristics and pore characteristics, the reliability is high, and the molded test piece can be used to study the mechanics and deformation characteristics of the loose soft coal, thereby facilitating popularization and application.
In combination with the actual situation of a coal mine A, the following details are given as an example:
(1) selection of tectonic soft coal: the coal mine A is taken as a study object, the coal seam of this mine is loose and broken soft coal, a soft coal sample in a newly exposed coal seam is selected from the mining area of this coal mine having a buried depth of 800 m; and the buried depth is recorded as H= 800 m;
(2) determination of a soft coal firmness coefficientfi: the coal sample obtained in step (1) that is relatively intact in lumpiness is selected; according to the national standard "Method for Determination of Firmness Coefficient of Coal (GB/T23561.12-2010)", it is determined that the firmness coefficient fi = 0.4; accordingly, the uniaxial compressive strength of the intact raw coal is back-calculated to be 1Of, i.e., 4 MPa;
(3) according to GB/T 23561.2-2009 and GB/T 50266-99, it is determined that the true density and apparent density of the raw coal are 1.63 g/cm and 1.42 g/cm3 ,
respectively; and according to a formula, it is calculated that the porosity ni of the raw coal is 12.88%.
(4) Raw coal from three different locations in a coal seam hosting range is taken according to GB-23561.6-2009-T; and according to a formula, it is determined that the water contents are 2.3%, 4.6%, and 4.9% respectively, the value range of the water contents of the coal seam is 2.3%-4.9%, and the average water content is 3.9%.
(5) The raw coal is air-dried and sieved, and coal pieces having a size of greater than 35 mm are screened out to avoid experimental fluctuations.
(6) Molding of loose soft coal in a laboratory: 1. water that is 3.9% by mass of the selected dry raw coal is added to this raw coal, and the two are mixed and stirred evenly. 2. According to the buried depth of 800 m, the corresponding molding pressure of a standard-sized cylindrical test sample is calculated using a molding pressure formula that is: P = rr2 yH, wherein if the measured value of y is 25 kN/m3
, P = 39.25 kN; 3. the raw coal is evenly added to a standard-sized cylindrical mold and then placed below a press for pressing according to the molding pressure P = 39.25 kN, and the pressure is maintained for 20 min. 4. The molded coal is placed in a natural state for 7 days.
(7) It is determined that the height, diameter and mass of the briquette are 100.31 mm, 49.89 mm, and 280.2 g, respectively, and the apparent density thereof is calculated to be 1.43g/cm 3 ; the true density of the raw coal has been determined to be 1.63 g/cm3 in step 3; accordingly, the porosity n2 of the briquette is calculated to be 12.29%.
(8) It is tested that the uniaxial compressive strength R of the briquette test piece is 3.91 MPa.
(9) 1Of is compared with R and nj is compared with n2. It is found that the porosity error between the molded coal body and the raw coal is 4.5%, and the strength error therebetween is 2.3%, which conforms to the principle of considering the two to be equivalent as along as the both errors are less than 5%; that is, if 10fz R and n z n2, it is proved that the rate of water addition for briquette production is appropriate, the parameters are accurate, and the strength and porosity of the briquette are equivalent to those of the raw coal, i.e., the briquette is equivalent to the raw coal.
Claims (4)
1. A method for simulating equivalent field soft coal in a laboratory, comprising the
following steps:
Sl: selection of loose and broken soft coal: selecting a loose and broken coal sample
from a newly exposed soft coal seam as raw coal, and recording a buried depth H of a
site;
S2: determining a soft coal firmness coefficient f of the selected coal sample
according to the national standard GB/T23561.12-2010, and back-calculating the
coefficient into uniaxial compressive strength of the raw coal, wherein the uniaxial
compressive strength is 1Of;
S3: determining true density T and apparent density A of the raw coal according to
GB/T 23561.2-2009 and GB/T 50266-99, and finding a porosity ni of the raw coal
according to experimental results;
A the porosity calculation formula being n =(1 -)x100%, wherein T is the true T density, i.e., the density of a coal body excluding pores and fractures, g/cm 3 ; and A is
the apparent density, i.e., the density of the coal body including pores and fractures,
g/cm 3;
S4: taking raw coal from three different locations in a coal seam hosting range
according to GB-23561.6-2009-T, determining a value range wi-w2 of water contents,
and calculating the average w;
S5: air-drying and sieving the raw coal taken in step S1, and screening out coal pieces
of a relatively large size to avoid experimental fluctuations;
S6: molding of loose soft coal in a laboratory: a. adding, to the selected dry raw coal,
water calculated according to the average water content w of the raw coal under this
mass, and mixing the selected dry raw coal and water evenly; b. calculating the
corresponding molding pressure of a standard-sized cylindrical test sample according to the buried depth H, the size of the standard-sized cylindrical test sample being Dxh 2 = 50mmx100mm, the molding pressure being P = zrryH, wherein y is the bulk density of overlying strata of the coal seam, which is generally 25,000 KN/m3 , and r is the radius D/2 of the cylindrical test sample; c. evenly adding the raw coal to which the water is added in step a to a standard-sized cylindrical mold and placing same below a press for pressing according to the molding pressure, maintaining the molding pressure for a certain period of time; and d. placing the molded coal in a natural state for a certain period of time to form a briquette;
S7: determining the height h, diameter D and mass M of the briquette, and calculating the apparent density A 1 thereof, wherein the true density of the raw coal has been determined in step S3, and calculating the porosity n2 of the briquette accordingly;
the porosity of the briquette being n2 =(1-)x100%, wherein T is the true density T of the raw coal, g/cm 3 ; and A 1 being the apparent density of the briquette, g/cm 3
Al M according to a formula, it is calculated that ( )2h , wherein M is the mass of 2 the briquette, g; D is the diameter of a test piece, mm; and h is the height of the test piece, mm;
S8: testing the uniaxial compressive strength R of the briquette test piece; and
S9: comparing 1Of with R and njwith n2: if 10f~ R and n~ n2, it is proved that the rate of water addition for briquette production is appropriate, the parameters are accurate, and the strength and porosity of the briquette are equivalent to those of the raw coal, i.e., the briquette is equivalent to the raw coal; if 10f> R and ni > n2, step S6 is repeated and molding water is reduced, and steps S7 and S8 are repeated until it is calculated that 1Of~ R and nI~ n2, and the strength and porosity of the briquette are equivalent to those of the raw coal, i.e., the briquette is equivalent to the raw coal; if 1Of< R and ni < n2, step S6 is repeated and the molding water is increased, and steps S7 and S8 are repeated until it is calculated that 10f~ R and n~ n2, and the strength and porosity of the briquette are equivalent to those of the raw coal, i.e., the briquette is equivalent to the raw coal.
2. The method for simulating equivalent field soft coal in a laboratory according to
claim 1, wherein in step S9, if the error between 10f and R is less than 5%, it is
considered that the briquette and the raw coal are equivalent, and if the error between
nj and n2 is less than 5%, it is considered that the briquette and the raw coal are
equivalent.
3. The method for simulating equivalent field soft coal in a laboratory according to
claim 2, wherein in step S5, large-particle coal pieces having a diameter of greater
than 35 mm are screened out to avoid the impact of breakage of large-particle coal
pieces during the molding process on the strength of the molded coal body.
4. The method for simulating equivalent field soft coal in a laboratory according to
any one of claims 1-3, wherein in step S6, the molding pressure is maintained for 20
minutes in step c; and the molded coal is placed in the natural state for 7 days in step
d.
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| CN201910542812.1A CN110411795B (en) | 2019-06-21 | 2019-06-21 | Method for simulating equivalent field soft coal in laboratory |
| PCT/CN2019/110598 WO2020252989A1 (en) | 2019-06-21 | 2019-10-11 | Method for simulating equivalent on-site soft coal in laboratory |
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| CN113418764A (en) * | 2021-06-17 | 2021-09-21 | 北京科技大学 | Automatic sample pressing device and method for preparing block mass with specific porosity |
| CN113567244B (en) * | 2021-07-23 | 2023-11-10 | 山东交通学院 | Positive fault physical simulation test device and method for coal and gas outburst simulation test |
| CN113751143B (en) * | 2021-08-24 | 2023-01-03 | 武汉三源特种建材有限责任公司 | Method for determining uniaxial compressive strength of non-actual ore |
| CN113820211B (en) * | 2021-09-16 | 2024-01-30 | 马鞍山钢铁股份有限公司 | Method for measuring hardening period of coal under silo process condition |
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| CN101469283A (en) * | 2007-12-26 | 2009-07-01 | 彭德智 | Coal briquette and method for producing the same |
| JP5900083B2 (en) * | 2012-03-26 | 2016-04-06 | Ｊｆｅスチール株式会社 | Coal bond strength measurement method |
| CN104694191B (en) * | 2014-12-09 | 2017-04-19 | 山东大学 | Gas-containing coal similar material and preparation method thereof |
| CN104875417B (en) * | 2015-05-05 | 2017-01-04 | 浙江大学 | A kind of hydraulic forming device for suppressing moulded coal and control method thereof |
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| CN107843553B (en) * | 2017-10-12 | 2020-03-20 | 中国矿业大学 | Method for testing interface bonding strength of coal body and anchoring agent |
| CN108088718B (en) * | 2017-12-22 | 2020-06-19 | 徐州恒安煤矿技术有限公司 | Underground coal seam soft layering simulation replication method and small-sized soft layering pressing device |
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| AU2019445396B2 (en) | 2021-10-07 |
| CN110411795B (en) | 2020-06-30 |
| WO2020252989A1 (en) | 2020-12-24 |
| CN110411795A (en) | 2019-11-05 |
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