AU2021355607B2 - Rock-like material and preparation method thereof - Google Patents
Rock-like material and preparation method thereof Download PDFInfo
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- AU2021355607B2 AU2021355607B2 AU2021355607A AU2021355607A AU2021355607B2 AU 2021355607 B2 AU2021355607 B2 AU 2021355607B2 AU 2021355607 A AU2021355607 A AU 2021355607A AU 2021355607 A AU2021355607 A AU 2021355607A AU 2021355607 B2 AU2021355607 B2 AU 2021355607B2
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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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
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2493/00—Characterised by the use of natural resins; Derivatives thereof
- C08J2493/04—Rosin
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/03—Investigating materials by wave or particle radiation by transmission
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/649—Specific applications or type of materials porosity
Abstract
The present discloses a rock-like material and a preparation method thereof. The method
includes: obtaining an aggregate composition and a volume percent of an aggregate adhesive
of a target rock; mixing, stirring and curing a first epoxy resin, a first rosin and a first curing
5 agent each having a corresponding mass according to the aggregate composition to obtain a
cured product, and crushing the cured product to obtain an epoxy resin aggregate having a
size identical to an average diameter of aggregate particles of the target rock; mixing and
stirring a second epoxy resin, a second rosin and a second curing agent each having a
corresponding mass according to a strength scale of the rock-like material to obtain a liquid
10 epoxy resin adhesive; and mixing, stirring and curing the epoxy resin aggregate and the epoxy
resin adhesive each having a corresponding mass according to the volume percent of the
aggregate adhesive to obtain the rock-like material. In the present method, the rock-like
material is prepared by the epoxy resin, and has advantages of low density, low strength, a
less impact energy generated during a damage process and a high safety.
15
Description
This application claims priority to and benefits of Chinese Patent Application Serial No.
202011119285.2, entitled "rock-like material and preparation method thereof', filed with the
National Intellectual Property Administration of P. R. China on October 19, 2020, the entire
content of which is incorporated herein by reference.
The present disclosure relates to a technical field of simulated materials, and more
particularly to a rock-like material and a preparation method thereof.
In order to study coal mining, a dynamic simulation experiment of a rock breaking
process is normally required to be carried out. In the experiment, a simulation model is
established with a rock-like material, deformation and damage of the simulation model due to
an external force/action are observed, and deformation and damage of rocks are acquired
according to a similarity criterion. This simulation experiment provides a scientific basis for
the coal mining. However, in the art, the rock-like materials generally have a high density and
strength, and thus a large impact energy is generated according to the breaking process of the
simulation model in the experiment, which causes safety problems to on-site people and
construction work.
Embodiments of the present disclosure seek to solve at least one of the problems existing
in the related art to at least some extent. Accordingly, a first object of the present disclosure is
to provide a method for preparing a rock-like material. The rock-like material is prepared by
epoxy resin, and has advantages of a low density and a low strength, and less impact energy is
generated during a damage process of the similar model, which improves the safety of on-site
personnel and construction plant.
A second object of the present disclosure is to provide a rock-like material. In order to realize above objects, in a first aspect of the present disclosure, a method for preparing a rock-like material is provided. The method includes: obtaining an aggregate composition and a volume percent of an aggregate adhesive of a target rock; mixing, stirring and curing a first epoxy resin, a first rosin and a first curing agent each having a corresponding mass according to the aggregate composition to obtain a cured product, and crushing the cured product to obtain an epoxy resin aggregate having a size identical to an average diameter of aggregate particles of the target rock; mixing and stirring a second epoxy resin, a second rosin and a second curing agent each having a corresponding mass according to a strength scale of the rock-like material to obtain a liquid epoxy resin adhesive; and mixing, stirring and curing the epoxy resin aggregate and the epoxy resin adhesive each having a corresponding mass according to the volume percent of the aggregate adhesive to obtain the rock-like material. According to the method for preparing the rock-like material in the present disclosure, the epoxy resin aggregate and the epoxy resin adhesive are respectively made of the epoxy resin, the rosin and the curing agent. The epoxy resin aggregate and the epoxy resin adhesive are mixed, stirred and cured according to the volume percent of the aggregate adhesive to obtain the rock-like material. Compared with a rock-like material made of cement, gypsum and sand in the related art, the rock-like material is prepared from the epoxy resin by the method of the present disclosure, and has advantages of the low density, and the low strength, and less impact energy is generated during the damage process of the similar model, which improves the safety of the on-site personnel and the construction plant. In addition, the method for preparing the rock-like material provided in the above embodiments of the present disclosure may have the following additional technical features. In an embodiment of the present disclosure, the method further includes: obtaining a porosity of the target rock; and adding a foaming agent or a defoaming agent having a corresponding mass according to the porosity during mixing and stirring the epoxy resin aggregate and the epoxy resin adhesive. In an embodiment of the present disclosure, mixing, stirring and curing the first epoxy resin, the first rosin and the first curing agent each having the corresponding mass according to the aggregate composition includes: determining a first mass ratio of the first epoxy resin, the first rosin and the first curing agent according to the aggregate composition; determining a first desired mass of each of the first epoxy resin, the first rosin and the first curing agent according to a total desired mass of the epoxy resin aggregate and the first mass ratio; and mixing, stirring and curing the first epoxy resin, the first rosin and the first curing agent each having the corresponding mass according to the first desired mass. In an embodiment of the present disclosure, the method further includes: obtaining a size scale in a dynamic simulation experiment; and determining the strength scale of the rock-like material by a dynamic similarity criterion according to the size scale in the dynamic simulation experiment and a density scale of a polymer material. In an embodiment of the present disclosure, mixing and stirring the second epoxy resin, the second rosin and the second curing agent each having the corresponding mass according to the strength scale of the rock-like material to obtain the liquid epoxy resin adhesive includes: determining a second mass ratio of the second epoxy resin, the second rosin and the second curing agent according to the strength scale of the rock-like material; determining a second desired mass of each of the second epoxy resin, the second rosin and the second curing agent according to a total desired mass of the epoxy resin adhesive and the second mass ratio; and mixing and stirring the second epoxy resin, the second rosin and the second curing agent each having the corresponding mass according to the second desired mass. In an embodiment of the present disclosure, the method further includes: scanning the target rock by a computed tomography (CT) imaging machine; and obtaining the aggregate composition and the volume percent of the aggregate adhesive of the target rock according to a scanning result. In an embodiment of the present disclosure, the method further includes: scanning the target rock by a CT imaging machine; and obtaining the porosity according to a scanning result. In an embodiment of the present disclosure, the method further includes: crushing the cured product by an aggregate crusher. In an embodiment of the present disclosure, the method further includes: scanning the target rock by a CT imaging machine; acquiring fracture structure data of the target rock according to a scanning result; and engraving a macrostructure surface of the rock-like material by a laser engraving machine according to the fracture structure data. In order to realize above objects, in a second aspect of the present disclosure, a method for preparing a rock-like material is provided. The rock-like material is prepared by the above-mentioned method for preparing the rock-like similar material in the first aspect of the present disclosure, and includes an epoxy resin aggregate and an epoxy resin adhesive. Compared with the rock-like material made of cement, gypsum and sand in the related art, the rock-like material is prepared from the epoxy resin by the method of the present disclosure, and has advantages of the low density, and the low strength, and less impact energy is generated during the damage process of the similar model, which improves the safety of the on-site personnel and the construction plant. Additional aspects and advantages of embodiments of the present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS These and other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the drawings, in which: FIG. 1 is a flow chart of a method for preparing a rock-like material according to an embodiment of the present disclosure. FIG. 2 is a flow chart of mixing, stirring and curing a first epoxy resin, a first rosin and a first curing agent each having a corresponding mass according to the aggregate composition in a method for preparing a rock-like material according to an embodiment of the present disclosure. FIG. 3 is a flow chart of mixing and stirring a second epoxy resin, a second rosin and a second curing agent each having a corresponding mass according to a strength scale of a rock-like material in a method for preparing a rock-like material according to an embodiment of the present disclosure. FIG. 4 is a flow chart of mixing and stirring an epoxy resin aggregate and an epoxy resin adhesive each having a corresponding mass in a method for preparing a rock-like material according to an embodiment of the present disclosure. FIG. 5 is a schematic diagram showing a method for preparing a rock-like material according to an embodiment of the present disclosure. Reference numerals: 1: target rock; 2: macrostructure surface of target rock; 3: adhesive matrix of target rock; 4: aggregate particles of target rock; 5: micro-crack of target rock; 6: first part of epoxy resin for forming epoxy resin aggregate; 7: second part of epoxy resin for forming epoxy resin aggregate; 8: first part of epoxy resin for forming epoxy resin adhesive; 9: second part of epoxy resin for forming epoxy resin adhesive; 10: epoxy resin aggregate; 11: epoxy resin adhesive; 12: pore; 13: rock-like material; 14: macrostructure surface of rock-like material.
DETAILED DESCRIPTION Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the drawings. The same or similar elements are denoted by same reference numerals in different drawings unless indicated otherwise. The embodiments described herein with reference to drawings are explanatory, and used to generally understand the present disclosure. The embodiments shall not be construed to limit the present disclosure. The slope coal shearer and the split platform supporting the slope coal shearer according to the embodiments of the present disclosure will be described below with reference to the accompanying drawings. FIG. 1 is a flow chart of a method for preparing a rock-like material in an embodiment of the present disclosure. As shown in FIG. 1, the method for preparing the rock-like material in an embodiment of the present disclosure includes the following operations.
In block S101, an aggregate composition and a volume percent of an aggregate adhesive of a target rock are obtained. It should be noted that the target rock is composed of the aggregate and the aggregate adhesive. The aggregate includes a material of particles of the target rock, and the aggregate adhesive includes an adhesive material (i.e., an adhesive matrix) of the target rock.
Optionally, the aggregate composition and the volume percent of the aggregate adhesive of the target rock may be obtained from statistical data of the target rock, and the statistical data included data of the composition of the aggregate and the volume percent of the aggregate adhesive. Optionally, the aggregate composition and the volume percent of the aggregate adhesive of the target rock may be obtained by detecting the target rock. For example, the target rock may be scanned by a computed tomography (CT) imaging machine. The composition of the aggregate and the volume percent of the aggregate adhesive of the target rock may be obtained according to a scanning result. For example, the target rock may be sampled by a coring machine to obtain a target rock sample, and the sample may be scanned by the CT imaging machine to obtain the aggregate composition and the volume percent of the aggregate adhesive according to the scanning result. In block S102, a first epoxy resin, a first rosin and a first curing agent, each having a corresponding mass according to the aggregate composition, are mixed, stirred and cured to obtain a cured product, and the cured product is crushed to obtain an epoxy resin aggregate having a size identical to an average diameter of aggregate particles of the target rock. In an embodiment of the present disclosure, the epoxy resin aggregate prepared by the first epoxy resin, the first rosin and the first curing agent may be used as the aggregate of the rock-like material. In preparing the epoxy resin aggregate, the mass of each of the first epoxy resin, the first rosin and the first curing agent is determined according to the aggregate composition of the target rock, and the first epoxy resin, the first rosin and the first curing agent, each of the corresponding mass, are mixed, stirred and cured to obtain the cured product, and the cured product is crushed to obtain the epoxy resin aggregate, the epoxy resin aggregate has a size (an average particle diameter) identical to the average aggregate particle diameter of the target rock. Optionally, the first epoxy resin, the first rosin and the first curing agent, each having the corresponding mass, are mixed and stirred for a duration less than a preset duration threshold, which may avoid the mixture of the first epoxy resin, the first rosin and the first curing agent to be prematurely cured, and ensure a stable strength of the epoxy resin aggregate. The preset duration threshold may be set according to the actual situation, for example, 10 minutes.
Optionally, after mixing and stirring the first epoxy resin, the first rosin and the first curing agent each having the corresponding mass, the obtained mixture may be cured in a constant temperature and humidity chamber to obtain the epoxy resin aggregate with a stable strength. It is understood that the first epoxy resin, the first rosin and the first curing agent in the corresponding mass ratio are mixed, stirred and cured to obtain the cured product, and the cured product is crushed into particles having the size identical to the average aggregate particle diameter of the target rock. In this way, the obtained epoxy resin aggregate is more similar in structure to the aggregate of the target rock, which improves a similarity in a microstructure of the epoxy resin aggregate. Optionally, the target rock may be scanned by the CT imaging machine, and the average particle diameter of the aggregate of the target rock may be obtained according to the scanning result. Optionally, the cured product may be crushed by an aggregate crusher. In block S103, a second epoxy resin, a second rosin and a second curing agent, each having a corresponding mass according to a strength scale of the rock-like material, are mixed and stirred to obtain a liquid epoxy resin adhesive.
In an embodiment of the present disclosure, the liquid epoxy resin adhesive prepared from the second epoxy resin, the second rosin and the second curing agent is used as the adhesive of the rock-like material. In preparing the liquid epoxy resin adhesive, the mass of the second epoxy resin, the mass of the second rosin and the mass of the second curing agent are determined according to the strength scale of the rock-like material, and the second epoxy resin, the second rosin and the second curing agent are mixed in the corresponding masses to obtain the liquid epoxy resin adhesive.
The strength scale of the rock-like material is a ratio of a strength of the rock-like material to a strength of the target rock. For example, in the case of the rock-like material having a strength of 0.1 MPa, and the target rock having a strength of 30 MPa, the strength scale of the rock-like material is 1:300. Optionally, obtaining the strength scale of the rock-like material may include obtaining a size scale in a dynamic simulation experiment, and determining the strength scale of the rock-like material by a dynamic similarity criterion according to the size scale in the dynamic simulation experiment and a density scale of a polymer material. The size scale in the dynamic simulation experiment is a ratio of a size of a similar model made of the rock-like material to a size of a target model made of the target rock in the dynamic simulation experiment. For example, if the similar model of the rock-like material and the target model of the target rock are cubes, a side length of the similar model is 5 meters, and a side length of the target model is also 5 meters, the size scale in the dynamic simulation experiment is 1:1, and the dynamic simulation experiment is an original proportion experiment. The density scale of the polymer materials is a ratio of a density of the polymer to a density of the target rock, which is a constant value of 1.1:2.5. The dynamic similarity criterion may include a variety of criteria, such as a similarity criterion between an elastic force and an inertial force, and a similarity criterion between an elastic force and a self-gravity, etc., which may be selected according to the actual situations. In the related art, the strength scale of the rock-like material is generally obtained by the similarity criterion of the elastic force and the self-gravity. The similarity criterion of the elastic force and the self-gravity can only ensure that a performance of the similar model before damage is similar to that of the target model, but cannot ensure that a performance of the similar model after damage is similar to that of the target model. That is, the similarity criterion of the elastic force and the self-gravity cannot simulate the damage process of the target model, and the accuracy of the experiment is low.
In an embodiment of the present disclosure, the strength scale of the rock-like material may be obtained by the similarity criterion of the elastic force and the inertial force, which may ensure that the performances of the similar model before and after damage are similar to those of the target model, thereby improving the mechanical similarity between the rock-like material and the target rock, realizing the simulation of the damage process of the target model, and improving the accuracy. Optionally, a formula for obtaining the strength scale of the rock-like materials by using the similarity criterion of the elastic force and the inertial force is as follows:
Cc=CeCpCL
where Cc is the strength scale of the rock-like material, Ce is a modulus scale of the rock-like material, C is the density scale of the rock-like material, CL is the size scale in the dynamic simulation experiment. It should be noted that the modulus scale Ce of the rock-like material is a ratio of a modulus of the rock-like material to a modulus of the target rock. Optionally, the second epoxy resin, the second rosin and the second curing agent each having the corresponding mass are mixed and stirred for a duration less than a preset duration threshold, which may prevent the mixture of the second epoxy resin, the second rosin and the second curing agent from being cured, thereby obtaining the liquid epoxy resin adhesive. The preset duration threshold may be set according to the actual situations, for example, 10 minutes.
In block S104, the epoxy resin aggregate and the epoxy resin adhesive, each having a corresponding mass according to the volume percent of the aggregate adhesive, are mixed, stirred and cured to obtain the rock-like material. In an embodiment of the present disclosure, the mass of the epoxy resin aggregate and the mass of the epoxy resin adhesive are obtained according to the volume percent of the aggregate adhesive, and the epoxy resin aggregate and the epoxy resin adhesive are mixed, stirred and cured to obtain the rock-like material. Optionally, obtaining the mass of the epoxy resin aggregate and the mass of the epoxy resin adhesive according to the volume percent of the aggregate adhesive may include determining a third mass ratio of the epoxy resin aggregate to the epoxy resin adhesive according to the volume percent of the aggregate adhesive, and determining a total desired mass of the epoxy resin aggregate and a total desired mass of the epoxy resin adhesive according to a total desired mass of the rock-like material and the third mass ratio. For example, if the third mass ratio of the epoxy resin aggregate to the epoxy resin adhesive is 5:1, and the total required mass of the rock-like material is 60 kg, the total required mass of the epoxy resin aggregate is 50 kg, and the total required mass of the epoxy resin adhesive is 10 kg. Optionally, after mixing and stirring the epoxy resin aggregate and the epoxy resin adhesive each having the corresponding mass, the obtained mixture of the epoxy resin aggregate and the epoxy resin may be poured into a mold for forming, the molded mixture may be replaced in a constant temperature chamber for maintenance, and the rock-like material with a stable strength may be obtained. The temperature of the constant temperature chamber may be 150 °C, and the maintenance time of the molded mixture in the constant temperature chamber may be 24 hours.
It is understood that the rock-like material made of cement, gypsum and sand in the related art generally have a high density and a high strength, and thus a relatively large impact energy will be generated during the damage process of the similar model in the experiment, which causes many safety problems to on-site personnel and construction plant. The rock-like material made of the epoxy resin polymer of the present disclosure has a low density, a low strength, and thus less impact energy is generated during the damage process of the similar model, which ensures the safety of the on-site personnel and the construction plant. It is understood that according to the similarity criterion of the elastic force and the inertial force, the modulus scale and the strength scale of the rock-like material are equal, and thus the rock-like material also has a low modulus, that is, has an elasto-brittle, and has mechanical properties similar to the target rock. It is understood that the epoxy resin has a high light transmittance, and the prepared rock-like material also has a high light transmittance, which is convenient for observing an internal structure of the material, such that the operators may observe the internal deformation and failure of the similar model during the damage process. In addition, the high light transmittance also contributes to printing the internal structure by a laser. Accordingly, according to the method for preparing the rock-like material in the present disclosure, the epoxy resin aggregate and the epoxy resin adhesive are respectively made of the epoxy resin, the rosin and the curing agent. The epoxy resin aggregate and the epoxy resin adhesive are mixed, stirred and cured according to the volume percent of the aggregate adhesive to obtain the rock-like material. Compared with the rock-like material made of cement, gypsum and sand in the related art, the rock-like material made of epoxy resin in the method of the present disclosure has a low density, a low strength, and less impact energy is generated during the damage process of the similar model, which improves the safety of the on-site personnel and the construction plant. In an embodiment of the present disclosure, as shown in FIG.2, block S102 of mixing, stirring and curing the first epoxy resin, the first rosin and the first curing agent each having the corresponding mass according to the aggregate composition may include the following operations. In block S201, a first mass ratio of the first epoxy resin, the first rosin and the first curing agent may be determined according to the aggregate composition.
It is understood that as the composition of the aggregate of the target rock varies, the first mass ratio of the first epoxy resin, the first rosin and the first curing agent for preparing the epoxy resin aggregate should also varies. Optionally, a list or table of a mapping relationship between the aggregate composition and the first mass ratio may be established in advance. After the aggregate composition is obtained, the first mass ratio of the first epoxy resin, the first rosin and the first curing agent may be determined according to the mapping relationship or the mapping table to prepare the epoxy resin aggregate. The mapping relationship or the mapping table may be calibrated according to the actual situations. In block S202, a first desired mass of each of the first epoxy resin, the first rosin and the first curing agent may be determined according to the total desired mass of the epoxy resin aggregate and the first mass ratio.
For example, if the first mass ratio of the first epoxy resin, the first rosin and the first curing agent is 5:1:1, and the total desired mass of the epoxy resin aggregate is 70 kg, the first desired mass of the first epoxy resin is 50 kg, the first desired mass of the first rosin is 10 kg and the first desired mass of the first curing agent is 10 kg. It should be noted that the total desired mass of the epoxy resin aggregate may be determined in a way similar to the above-mentioned embodiments, which will not be described in detail here. In block S203, the first epoxy resin, the first rosin and the first curing agent each having the corresponding mass according to the first desired mass are mixed, stirred and cured. In this way, the first mass ratio of the first epoxy resin, the first rosin and the first curing agent may be determined according to the aggregate composition of the target rock, and the first desired masses of the first epoxy resin, the first rosin and the first curing agent may be determined according to the total desired mass of the epoxy resin aggregate and the first mass ratio, such that the epoxy resin aggregate may be obtained by mixing, stirring and curing the first epoxy resin, the first rosin and the first curing agent each having the corresponding mass according to the first desired mass.
In an embodiment of the present disclosure, as shown in FIG. 3, block S103 of mixing and stirring the second epoxy resin, the second rosin and the second curing agent each having the corresponding mass according to the strength scale of the rock-like material to obtain the liquid epoxy resin adhesive may include the following operations. In block S301, a second mass ratio of the second epoxy resin, the second rosin and the second curing agent is determined according to the strength scale of the rock-like material.
It is understood that as the strength scale of the rock-like material varies, and the second mass ratio of the second epoxy resin, the second rosin and the second curing agent for preparing the liquid epoxy resin adhesive varies. Optionally, a list or table of a mapping relationship between the strength scale and the second mass ratio may be established in advance. After the strength scale is obtained, the second mass ratio of the second epoxy resin, the second rosin and the second curing agent may be determined according to the mapping relationship or the mapping table to prepare the liquid epoxy resin adhesive. The mapping relationship or the mapping table may be calibrated according to the actual situations. In block S302, a second desired mass of each of the second epoxy resin, the second rosin and the second curing agent is determined according to the total desired mass of the epoxy resin adhesive and the second mass ratio. In block S303, the second epoxy resin, the second rosin and the second curing agent each having the corresponding masses according to the second desired mass are mixed and stirred. It should be noted that the relevant contents of blocks S302 and S303 may refer to the above-mentioned embodiments, which will not be described in detail here. In this way, the second mass ratio of the second epoxy resin, the second rosin and the second curing agent may be determined according to the strength scale of the rock-like material, and the second desired mass of each of the second epoxy resin, the second rosin and the second curing agent may be determined according to the total desired mass of the epoxy resin adhesive and the second mass ratio, such that the epoxy resin adhesive may be obtained by mixing, stirring and curing the second epoxy resin, the second rosin and the second curing agent each having the corresponding mass according to the second desired mass.
In an embodiment of the present disclosure, as shown in FIG. 4, block S104 of mixing and stirring the epoxy resin aggregate and the epoxy resin adhesive each having the corresponding mass may include the following operations. In block S401, a porosity of the target rock is obtained. It should be noted that the porosity of the target rock is a volume percentage of pores in the target rock to a total volume of the target rock in a natural state. Optionally, the target rock may be scanned by a CT imaging machine, and the porosity may be obtained according to a scanning result. In block S402, a foaming agent or a defoaming agent having a corresponding mass is added according to the porosity during mixing and stirring the epoxy resin aggregate and the epoxy resin adhesive.
The foaming agent is used for increasing the porosity of the rock-like material, and the defoaming agent is used for decreasing the porosity of the rock-like material. It is understood that as the porosity of the target rock varies, and the mass of the foaming agent or the defoaming agent added into the rock-like material varies. Optionally, a list or table of a mapping relationship between the porosity and the foaming agent or the defoaming agent is established in advance. After the porosity is obtained, the mass of the foaming agent or the defoaming agent may be determined according to the mapping relationship or the mapping table to prepare the rock-like material. The mapping relationship or the mapping table may be calibrated according to the actual situations. In this way, in mixing and stirring the epoxy resin aggregate and the epoxy resin adhesive, the foaming agent or the defoaming agent may be added in the corresponding mass according to the porosity, such that the porosity of the rock-like material is similar to that of the target rock, and the rock-like material is more similar in structure to the target rock, which improves the similarity in a microstructure of the rock-like material. In an embodiment of the present disclosure, after block S104 of mixing, stirring and curing the epoxy resin aggregate and the epoxy resin adhesive each having the corresponding mass to obtain the rock-like material, a macrostructure surface of the rock-like material may be engraved by a laser engraving machine according to fracture structure data of the target rock. It is understood that the target rock may have a fracture structure. In the present method, based on the high light transmittance of the epoxy resin, the macrostructure surface of the rock-like material may be engraved by the laser engraving machine, such that the rock-like material may have the similar fracture structure data to the target rock. Therefore, the rock-like material is more similar in structure to the target rock, which improves the similarity in the microstructure of the rock-like material. Optionally, the target rock may be scanned by the CT imaging machine, and the fracture structure data of the target rock may be acquired according to the scanning result.
As shown in FIG. 5, a target rock 1 may be scanned by the CT imaging machine, and an aggregate composition and a volume percent of an aggregate adhesive of the target rock 1 are obtained according to the scanning result. An epoxy resin 6 and an epoxy resin 7 for preparing the epoxy resin aggregate are determined according to the aggregate composition, and are mixed, stirred, cured and crushed to obtain an epoxy resin aggregate 10. An epoxy resin 8 and an epoxy resin 9 for preparing the epoxy resin adhesive are determined according to a strength scale of a rock-like material, and are mixed and stirred to obtain an epoxy resin adhesive 11. The epoxy resin aggregate 10 and the liquid epoxy resin adhesive 11 are mixed, stirred and cured to obtain the rock-like material 13. According to fracture structure data of the target rock 1, a macrostructure surface 14 of the rock-like material 13 may be engraved by a three-dimensional laser engraving technology. As shown in FIG. 5, during mixing and stirring the epoxy resin aggregate 10 and the epoxy resin adhesive 11, a foaming agent or a defoaming agent may be added in a corresponding mass according to a porosity of the target rock 1 to form bubble pores 12 in microstructure. As shown in FIG. 5, the target rock 1 may have a macrostructure surface 2. The macrostructure surface 2 may include natural or artificial structure surfaces, including, but not limited to, a joint surface, a fissure surface, a bedding surface, and an artificial structural surface. As shown in FIG. 5, as shown in the scanning result from the CT imaging machine, the target rock 1 includes an adhesive matrix 3, aggregate particles 4 and micro-cracks 5. In an embodiment of the present disclosure, a mass ratio of standard sands, the epoxy resin, the curing agent and the foaming agent may be obtained according to the aggregate composition of the target rock, the average diameter and distribution of the aggregate particles, and the porosity of the target rock. The rock-like material may be prepared according to the mass ratio of the standard sands, the epoxy resin, the curing agent and the foaming agent. The standard sand is used to form the aggregate of the rock-like material, and the epoxy resin is used to configure the adhesive of the rock-like material. As shown in Table 1, when mass ratios of the standard sand, the epoxy resin, the curing agent and the foaming agent are different, the corresponding rock-like materials have different apparent densities, uniaxial compressive strengths and elastic moduli. Table 1. Properties of rock-like materials with different mass ratios standard epoxy curing foaming apparent density uniaxial compressive elastic sand (g) resin (g) agent agent (g) (g/cm3) strength (MPa) modulus
(g) (GPa)
500 80 40 5 1.92 101 21.0
500 90 45 5 1.95 111 20.5
500 100 50 5 1.99 125 22.4
500 110 55 5 2.01 126 23.2
500 120 60 5 2.07 135 24.1
500 120 60 8 2.01 122 23.8
500 120 60 10 1.94 107 23.5
As shown in Table 1, when the rock-like materials have the same masses of the standard sand, the epoxy resin, and the curing agent, but different masses of the foaming agent, the rock-like materials have different apparent densities, uniaxial compressive strengths and elastic moduli. The properties of the rock-like material may be controlled by changing the mass of the foaming agent. For example, in the case that the standard sand has a mass of 500 g, the epoxy resin has a mass of 120 g, and the curing agent has a mass of 60 g, when the foamingagent hasamassof5g,theapparentdensityoftherock-likematerialis2.07g/cm 3 ;
whether foaming agent ha s a mass of g, the apparent density of the rock-like material is
2.01 g/cm3 ; when the foaming agent has a mass of 10 g, the apparent density of the rock-like material is 1.94 g/cm3. It can be seen that with the increase of the mass of the foaming agent, the apparent density of the rock-like material gradually decreases, and the surface porosity gradually increases. The present disclosure further provides a rock-like material, which is prepared by the method for preparing the rock-like material as described in the above embodiments. The rock-like material includes an epoxy resin aggregate and an epoxy resin adhesive. Compared with the rock-like material made of cement, gypsum and sand in the related art, the rock-like material in the embodiments of the present disclosure is prepared from the epoxy resin, and the prepared rock-like material has advantages of a low density and a low strength, and less impact energy is generated during the damage process of the similar model, which improves the safety of on-site personnel and construction plant. In the specification of the present disclosure, it is to be understood that terms such as "central", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are for convenience of description and do not require that the present invention be constructed or operated in a particular orientation. In addition, terms such as "first" and "second" are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features. Thus, the feature defined with "first" and "second" may comprise one or more of this feature. In the description of the present invention, "a plurality of' means two or more than two, unless specified otherwise.
In the specification of the present disclosure, unless specified or limited otherwise, the terms "mounted," "connected," "coupled," "fixed" and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements, which can be understood by those skilled in the art according to specific situations. In the specification of the present disclosure, unless specified or limited otherwise, a structure in which a first feature is "on" or "below" a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween.
Furthermore, a first feature "on," "above," or "on top of' a second feature may include an embodiment in which the first feature is right or obliquely "on," "above," or "on top of' the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature "below," "under," or "on bottom of' a second feature may include an embodiment in which the first feature is right or obliquely "below," "under," or "on bottom of' the second feature, or just means that the first feature is at a height lower than
that of the second feature. Reference throughout this specification to "an embodiment," "some embodiments," "an example," "a specific example," or "some examples," means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases such as "in some embodiments," "in one embodiment", "in an embodiment", "in another example,' 'in an example," "in a specific example," or "in some examples," in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that the above embodiments cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the present disclosure.
Claims (10)
1. A method for preparing a rock-like material, comprising:
obtaining an aggregate composition and a volume percent of an aggregate adhesive of a
target rock;
mixing, stirring and curing a first epoxy resin, a first rosin and a first curing agent each
having a corresponding mass according to the aggregate composition to obtain a cured
product, and crushing the cured product to obtain an epoxy resin aggregate having a size
identical to an average diameter of aggregate particles of the target rock;
mixing and stirring a second epoxy resin, a second rosin and a second curing agent each
having a corresponding mass according to a strength scale of the rock-like material to obtain a
liquid epoxy resin adhesive; and
mixing, stirring and curing the epoxy resin aggregate and the epoxy resin adhesive each
having a corresponding mass according to the volume percent of the aggregate adhesive to
obtain the rock-like material.
2. The method according to claim 1, further comprising:
obtaining a porosity of the target rock; and
adding a foaming agent or a defoaming agent having a corresponding mass according to
the porosity during mixing and stirring the epoxy resin aggregate and the epoxy resin
adhesive.
3. The method according to claim 1, wherein mixing, stirring and curing the first epoxy
resin, the first rosin and the first curing agent each having the corresponding mass according
to the aggregate composition comprises:
determining a first mass ratio of the first epoxy resin, the first rosin and the first curing
agent according to the aggregate composition;
determining a first desired mass of each of the first epoxy resin, the first rosin and the
first curing agent according to a total desired mass of the epoxy resin aggregate and the first
mass ratio; and
mixing, stirring and curing the first epoxy resin, the first rosin and the first curing agent
each having the corresponding mass according to the first desired mass.
4. The method according to claim 1, further comprising: obtaining a size scale in a dynamic simulation experiment; and determining the strength scale of the rock-like material by a dynamic similarity criterion according to the size scale in the dynamic simulation experiment and a density scale of a polymer material.
5. The method according to claim 1, wherein mixing and stirring the second epoxy resin, the second rosin and the second curing agent each having the corresponding mass according to the strength scale of the rock-like material comprises: determining a second mass ratio of the second epoxy resin, the second rosin and the second curing agent according to the strength scale of the rock-like material; determining a second desired mass of each of the second epoxy resin, the second rosin and the second curing agent according to a total desired mass of the epoxy resin adhesive and the second mass ratio; and mixing and stirring the second epoxy resin, the second rosin and the second curing agent each having the corresponding mass according to the second desired mass.
6. The method according to claim 1, further comprising: scanning the target rock by a computed tomography (CT) imaging machine; and obtaining the aggregate composition and the volume percent of the aggregate adhesive of the target rock according to a scanning result.
7. The method according to claim 2, further comprising: scanning the target rock by a CT imaging machine; and obtaining the porosity according to a scanning result.
8. The method according to claim 1, further comprising: crushing the cured product by an aggregate crusher.
9. The method according to claim 1, further comprising: scanning the target rock by a CT imaging machine; acquiring fracture structure data of the target rock according to a scanning result; and engraving a macrostructure surface of the rock-like material by a laser engraving machine according to the fracture structure data.
10. A rock-like material prepared by the method for preparing the rock-like similar material according to any one of claims 1 to 9, wherein the rock-like material comprises an epoxy resin aggregate and an epoxy resin adhesive.
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| PCT/CN2021/099213 WO2022083134A1 (en) | 2020-10-19 | 2021-06-09 | Rock-like similar material and preparation method therefor |
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| CN115964931B (en) * | 2022-11-04 | 2023-09-05 | 广西大学 | Theory, method and formula for preparing rock materials with high strength and high brittleness and similar dynamic and static characteristics |
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| CN108613872B (en) * | 2018-06-13 | 2019-03-12 | 山东科技大学 | Transparent rocks test specimen crack propagation monitors system and method |
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