Rock-like material manufacturing method

Abstract

The invention relates to the technical field of rock-like material manufacturing, in particular to a rock-like material manufacturing method which comprises the steps that component information, porosity and mechanical information of a rock sample are obtained, the component information comprises the type, the density, the volume fraction and the particle size range of minerals, and the mechanical information comprises the elastic modulus and the Poisson's ratio; obtaining target mineral particles of the same type, volume fraction and particle size range based on the component information so as to obtain an experimental rock-like material; determining a target volume fraction of the cementing agent based on the porosity of the rock sample and the experimental rock-like material; determining a target type and a target curing temperature of the cementing agent based on the mechanical information of the rock sample and the experimental rock-like material; and at the target curing temperature, mixing the cementing agent with the target volume fraction under the target type with the target mineral particles, stirring and curing to obtain the rock-like material corresponding to the rock sample. By using the method provided by the invention, the rock-like material can be closer to the mesoscopic property and the mechanical property of the rock.

Description

Technical Field

[0001] The present invention relates to the technical field of rock-like material manufacturing, and in particular to a method for manufacturing a rock-like material. Background Art

[0002] Studying rock-like materials is of great significance in many aspects. The sample preparation of rock-like materials is simple and highly repeatable, and the formula can be flexibly adjusted to produce materials with different strengths and porosities for different research needs. Conducting similar simulation studies on rock materials can simulate the physical and mechanical properties of rocks and the engineering conditions they are in under laboratory conditions, which will help scientists and engineers better understand the mechanical behavior and failure mode of rock masses, and can provide theoretical guidance for engineering design and construction, geological disaster prevention and control, energy development and other fields.

[0003] Existing rock-like materials generally adopt the "aggregate + cementing matrix" model, which is specifically divided into cement-based rock materials, resin-based rock materials, gypsum-based rock materials, etc. (1) The main raw materials of cement-based rock materials are cement, aggregate and water. After being mixed evenly in a certain proportion, they are poured into molds for curing. The curing time depends on the type of cement and the strength requirements, usually about 28 days. (2) Resin-based rock materials often use epoxy resin, unsaturated polyester resin, etc., and prepare curing agents, etc. at the same time, and then add some quartz powder, glass fiber, etc. to adjust the performance of the material. (3) The main material of gypsum-based rock materials is gypsum powder, and some fiber materials are added to enhance the toughness of the material. Retarder or accelerator can also be added to adjust the setting time of the material.

[0004] The existing rock-like material models have the following problems: (1) The technical disadvantage of cement-based rock-like materials is that the hydration reaction of cement-based materials takes a certain amount of time to reach a high strength, and the early strength is relatively low, which affects the progress of the test or project. At the same time, the cement hydration process will generate heat, and the internal temperature of the material will rise. When the external temperature drops, thermal expansion and contraction cracks are likely to occur. (2) The technical disadvantage of resin-based rock-like materials is that the cost of resin is relatively high, the processing technology is relatively complicated, and the toughness of the manufactured rock-like materials is good. The failure mode is somewhat different from that of brittle rocks. (3) The technical disadvantage of gypsum-based rock-like materials is that the strength of gypsum-based materials is relatively low and they are easily affected by the temperature and humidity environment. Gypsum is a hydrophilic material and absorbs moisture in a humid environment, resulting in softening and deformation.

[0005] In addition, there are some common technical difficulties, especially the difficulty of rock-like materials to truly reflect the microscopic properties of rocks. For example, the characteristics of mineral particles are difficult to fully simulate, and rocks are composed of a variety of natural minerals with complex components and a certain proportion. Existing rock-like materials are difficult to accurately reproduce the mineral composition of rocks. Even if similar aggregates or fillers are added, the diversity of minerals cannot be reflected. At the same time, the mineral particles in rocks vary in size and shape, and it is difficult for aggregates or filling particles in rock-like materials to completely restore the distribution characteristics of minerals. At the same time, the mineral particles in rocks are connected together by a variety of cementation methods, so that the minerals form a solid whole, while the cementation method of rock-like materials is single, and the cementation strength is usually lower than that of rocks. In addition, when restoring the fracture structure, the fracture content of rock-like materials is difficult to control, and the void content is mostly circular or approximately circular, which deviates from the actual pore structure and porosity of the rock. Summary of the invention

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, the first purpose of the present invention is to propose a method for producing a rock-like material so that the rock-like material can be closer to the microscopic characteristics and mechanical properties of rocks.

[0008] The second object of the present invention is to provide a rock-like material.

[0009] To achieve the above-mentioned object, the first aspect of the present invention provides a method for preparing a rock-like material, comprising: Obtaining component information, porosity and mechanical information of the rock sample, wherein the component information includes the type, density, volume fraction and particle size range of the mineral, and the mechanical information includes the elastic modulus and Poisson's ratio; Based on the component information, target mineral particles of the same type, volume fraction and particle size range are obtained to obtain rock-like materials for experiments; Determine the target volume fraction of the binder based on the porosity of the rock specimen and the experimental rock-like material; Determine the target type and target curing temperature of the binder based on the mechanical information of the rock specimen and the rock-like material used in the experiment; At the target solidification temperature, the target volume fraction of the binder under the target type is mixed, stirred and solidified with the target mineral particles to obtain a rock-like material corresponding to the rock sample.

[0010] In the method of the first aspect of the present invention, the target volume fraction of the binder is determined based on the porosity of the rock sample and the experimental rock-like material, including: obtaining a plurality of first experimental rock-like materials after mixing, stirring and curing the target mineral particles with binders of different volume fractions; obtaining the porosity of each first experimental rock-like material; calculating the difference between the porosity of each first experimental rock-like material and the porosity of the rock sample to obtain the minimum porosity difference; the volume fraction of the binder in the first experimental rock-like material corresponding to the minimum porosity difference is the target volume fraction.

[0011] In the method of the first aspect of the present invention, the target type and target curing temperature of the binder are determined based on the mechanical information of the rock sample and the experimental rock-like material, including: for different binder types and different curing temperatures, the target mineral particles are mixed, stirred and cured with the binder of the target volume fraction to obtain the second experimental rock-like materials corresponding to each binder type and curing temperature; the mechanical information of each second experimental rock-like material is obtained; and the target type and target curing temperature of the binder are determined based on the ratio of the mechanical information of the second experimental rock-like material to the mechanical information of the rock sample.

[0012] In the method of the first aspect of the present invention, the target type and target curing temperature of the binder are determined based on the ratio of the mechanical information of the second experimental rock-like material to the mechanical information of the rock sample, including: respectively calculating the first ratio of the elastic modulus of the rock sample to the elastic modulus of each second experimental rock-like material; respectively calculating the second ratio of the Poisson's ratio of the rock sample to the Poisson's ratio of each second experimental rock-like material; comparing the first ratio and the second ratio corresponding to the same second experimental rock-like material to screen out a set of target second experimental rock-like materials whose first ratio is equal to the second ratio, and the type and curing temperature of the binder corresponding to each target second experimental rock-like material in the set of target second experimental rock materials are the target type and target curing temperature.

[0013] In the method of the first aspect of the present invention, the component information and porosity of the rock sample are obtained, including: using a CT scanning system to perform a three-dimensional scan on the rock sample to obtain three-dimensional scanning data; and determining the component information and porosity of the rock sample based on the three-dimensional scanning data.

[0014] In the method of the first aspect of the present invention, the CT scanning system adopts a dual-source dual-energy CT scanning system.

[0015] In the method of the first aspect of the present invention, the component information and porosity of the rock sample are determined based on the three-dimensional scanning data, including: determining the type and density of the minerals of the rock sample based on the three-dimensional scanning data; performing three-dimensional reconstruction based on the three-dimensional scanning data to obtain the porosity of the rock sample, as well as the particle size ranges and corresponding volume fractions of different types of minerals.

[0016] In the method of the first aspect of the present invention, target mineral particles of the same type, volume fraction and particle size range are obtained based on the component information, including: obtaining initial mineral particles consistent with the type of minerals in the rock sample; using a crusher to crush each type of initial mineral particles into different particle size ranges to screen out target mineral particles, wherein the type of the target mineral particles, the volume fraction of each type of mineral, and the particle size range are consistent with those of the rock sample.

[0017] In the method of the first aspect of the present invention, the binder is a polymer binder.

[0018] To achieve the above-mentioned purpose, the second aspect of the present invention proposes a rock-like material, which is prepared by the method proposed in the first aspect, and the rock-like material includes: target mineral particles and a binder with a target volume fraction under a target type.

[0019] The method for preparing a rock-like material provided by the present invention obtains component information, porosity and mechanical information of a rock sample, wherein the component information includes the type, density, volume fraction and particle size range of the mineral, and the mechanical information includes the elastic modulus and Poisson's ratio; based on the component information, target mineral particles of the same type, volume fraction and particle size range are obtained to obtain an experimental rock-like material; based on the porosity of the rock sample and the experimental rock-like material, a target volume fraction of a binder is determined; based on the mechanical information of the rock sample and the experimental rock-like material, a target type and a target curing temperature of the binder are determined; at the target curing temperature, a binder of a target volume fraction under a target type is mixed, stirred and cured with target mineral particles to obtain a rock-like material corresponding to the rock sample. In this case, the type, density, volume fraction, and particle size range of the rock sample are fully considered to obtain the target mineral particles, and then the porosity, elastic modulus, and Poisson's ratio are comprehensively considered to obtain the target curing temperature and the target type of the target volume fraction of the binder. The rock-like material obtained by using the target mineral particles and the obtained binder is closer to the rock sample in terms of microscopic properties, and the consideration of the elastic modulus and Poisson's ratio makes the mechanical properties of the rock-like material closer to the rock sample. Therefore, the rock-like material obtained by the method of the present invention is closer to the microscopic properties and mechanical properties of rock.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 A schematic diagram of a process for producing a rock-like material provided by an embodiment of the present invention; Figure 2 A schematic diagram of a process for determining a target volume fraction of a binder provided in an embodiment of the present invention; Figure 3 A schematic diagram of a process for determining a target type and a target curing temperature of a binder provided in an embodiment of the present invention; Figure 4 Scanning slice image of rock-like material provided by an embodiment of the present invention; Figure 5 A schematic diagram of a specific process of a method for producing a rock-like material provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] The following describes a method for producing a rock-like material according to an embodiment of the present invention with reference to the accompanying drawings.

[0024] The embodiment of the present invention provides a method for producing a rock-like material, so that the rock-like material is closer to the microscopic characteristics and mechanical properties of rock.

[0025] Figure 1 A schematic flow chart of a method for producing a rock-like material provided in an embodiment of the present invention.

[0026] like Figure 1 As shown, the method for preparing this type of rock material includes the following steps: Step S101, obtaining component information, porosity and mechanical information of the rock sample, wherein the component information includes the type, density, volume fraction and particle size range of the mineral, and the mechanical information includes the elastic modulus and Poisson's ratio.

[0027] In step S101, component information and porosity of a rock sample are obtained, including: performing a three-dimensional scan on the rock sample using a CT scanning system to obtain three-dimensional scanning data; and determining the component information and porosity of the rock sample based on the three-dimensional scanning data.

[0028] In step S101, a computed tomography scanning system (CT scanning system for short) adopts a dual-source dual-energy CT scanning system.

[0029] In step S101, the component information and porosity of the rock sample are determined based on the three-dimensional scanning data, including: determining the type and density of the minerals in the rock sample based on the three-dimensional scanning data; performing three-dimensional reconstruction based on the three-dimensional scanning data to obtain the porosity of the rock sample, as well as the particle size ranges and corresponding volume fractions of different types of minerals.

[0030] In step S101, the elastic modulus and Poisson's ratio can be measured by static tensile test, compression test, bending test, ultrasonic test and other methods.

[0031] Step S102, based on the component information, target mineral particles of the same type, volume fraction and particle size range are obtained to obtain rock-like materials for experiments.

[0032] In step S102, target mineral particles of the same type, volume fraction and particle size range are obtained based on the component information, including: obtaining initial mineral particles consistent with the type of minerals in the rock sample; using a crusher to crush each type of initial mineral particles into different particle size ranges to screen out target mineral particles, and the type of target mineral particles, the volume fraction of each type of mineral, and the particle size range are all consistent with those of the rock sample.

[0033] In step S102, considering that different mineral particles in the target mineral particles need a binder to bond together to form a physical or chemical bond, in order to make the final required rock-like material closer to the microscopic properties and mechanical properties of the rock, it is also necessary to determine the type, volume fraction and curing temperature of the binder.

[0034] In step S102, the binder is a polymer binder. Preferably, a single-component high molecular polymer is used as the binder. The high molecular polymer (ie, polymer) may be, for example, acrylate, polyurethane, liquid rosin resin, etc.

[0035] In step S102, the target mineral particles are mixed, stirred and cured with different binders to obtain the corresponding experimental rock-like materials, so that the type, volume fraction and curing temperature of the binder can be determined in combination with the experimental rock-like materials and rock samples. The mineral mass of the target mineral particles is calculated from the density, volume fraction and mold volume of each type of mineral contained therein.

[0036] Step S103, determining the target volume fraction of the binder based on the porosity of the rock sample and the experimental rock-like material.

[0037] Figure 2 FIG. 1 is a schematic diagram of a process for determining a target volume fraction of a binder according to an embodiment of the present invention. In step S103, Figure 2 As shown, the target volume fraction of the binder is determined based on the porosity of the rock sample and the experimental rock-like material, including: using the target mineral particles to mix, stir and solidify with the binder of different volume fractions to obtain multiple first experimental rock-like materials (step S1031); obtaining the porosity of each first experimental rock-like material (step S1032); calculating the difference between the porosity of each first experimental rock-like material and to obtain the minimum porosity difference; the volume fraction of the binder in the first experimental rock-like material corresponding to the minimum porosity difference is the target volume fraction (step S1033).

[0038] Step S104, determining the target type and target curing temperature of the binder based on the mechanical information of the rock sample and the experimental rock-like material.

[0039] Figure 3 FIG. 1 is a schematic diagram of a process for determining a target type and a target curing temperature of a binder according to an embodiment of the present invention. In step S104, Figure 3 As shown, the target type and target curing temperature of the binder are determined based on the mechanical information of the rock sample and the experimental rock-like material, including: for different binder types and different curing temperatures, the target mineral particles are mixed, stirred and cured with the binder of the target volume fraction to obtain the second experimental rock-like materials corresponding to each binder type and curing temperature (step S1041); the mechanical information of each second experimental rock-like material is obtained (step S1042); the target type and target curing temperature of the binder are determined based on the ratio of the mechanical information of the second experimental rock-like material to the mechanical information of the rock sample (step S1043).

[0040] Among them, in step S1043, the target type and target curing temperature of the binder are determined based on the ratio of the mechanical information of the second experimental rock-like material to the mechanical information of the rock sample, including: respectively calculating the first ratio of the elastic modulus of the rock sample to the elastic modulus of each second experimental rock-like material; respectively calculating the second ratio of the Poisson's ratio of the rock sample to the Poisson's ratio of each second experimental rock-like material; comparing the first ratio and the second ratio corresponding to the same second experimental rock-like material to screen out a set of target second experimental rock-like materials in which the first ratio is equal to the second ratio, and the type and curing temperature of the binder corresponding to each target second experimental rock-like material in the set of target second experimental rock-like materials are the target type and target curing temperature.

[0041] Step S105, at a target solidification temperature, mixing, stirring and solidifying a binder of a target volume fraction under a target type with target mineral particles to obtain a rock-like material corresponding to the rock sample.

[0042] In step S105, the volume of the required rock-like material is determined, and the required mineral mass is calculated based on the volume, the density and volume fraction of each type of mineral contained in the target mineral particles. The target mineral particles under the mineral mass and the binder with the target volume fraction under the target type are mixed, stirred and cured at the target curing temperature to obtain the rock-like material corresponding to the rock sample.

[0043] Among them, the uniaxial compressive strength of the rock-like material obtained by different target types and target solidification temperatures may be different, so the corresponding target type and target solidification temperature can be selected based on actual needs.

[0044] The CT scanning system adopts a dual-source dual-energy CT scanning system to illustrate the specific process of the rock-like material preparation method.

[0045] Figure 4 This is a scanned slice image of the rock-like material provided in an embodiment of the present invention. Figure 5 A schematic diagram of a specific process of a method for producing a rock-like material provided in an embodiment of the present invention.

[0046] like Figure 5 As shown, the specific process of the method for making this type of rock material includes: Step S201: Select a rock sample, perform CT scanning on it using a dual-source dual-energy CT system, and determine information such as the mineral composition and density in the rock based on the energy attenuation principle.

[0047] Specifically, a rock sample (also called prototype rock or target rock) is selected for making rock-like materials. There is no clear regulation on the shape and size, and it only needs to meet the scanning size limit and accuracy requirements of the dual-source dual-energy CT scanning system in this step. The rock sample is placed on the sample table of the CT scanning system, and the scanning voltage, current, resolution and other parameters are set and fixed according to the size of the rock sample. The CT scanning system is started to scan the rock sample to obtain three-dimensional scanning data of the rock sample.

[0048] The CT scanning system in this step is a specific dual-source dual-energy CT system, which has two X-ray sources with different energies. Different minerals in the rock sample have different absorption and attenuation characteristics under different energy X-rays. Based on this principle, different types of minerals in the rock can be accurately identified. The linear attenuation formulas of the energy after two different energy ray sources penetrate the rock sample are: (1) In the formula, I 1 and I 2 respectively represent the intensity of the two X-rays after penetrating the rock samples, I 01 and I 02 Respectively represent the incident X-ray intensities of two ray sources with different energies. and They represent the linear attenuation coefficient of the substance under two different energy radiation sources. x Indicates the thickness of the penetration rock sample.

[0049] Taking the logarithm of the two formulas in equation (1), we can obtain: (2) Through these two equations, the linear attenuation coefficient of the material under different ray energies can be calculated. and Through data analysis and processing, the mineral composition (i.e. mineral type) and density of rock samples can be accurately determined.

[0050] Static tensile tests were performed on rock samples to obtain the elastic modulus and Poisson's ratio of the rock samples.

[0051] Step S202: Process the three-dimensional scanning data of the rock sample, extract the spatial distribution characteristics of the minerals, and calculate information such as the particle size distribution range and volume fraction.

[0052] Specifically, the 3D scanning data of the rock sample was obtained and reconstructed using VoxelStudio Recon software; the rock sample was then reconstructed in 3D using Avizo software, and the scanning data was converted into a 16-bit grayscale image (grayscale value 0-65535), and then the threshold segmentation method was applied to obtain the spatial distribution characteristics of the minerals inside the rock sample, and the particle size distribution range (referred to as particle size range) and volume fraction, porosity and other information of different types of minerals were statistically analyzed. The specific statistical method for the particle size distribution range is to use the Label Analysis function in Avizo to perform statistics on the particle size and volume ratio of each type of mineral particles in the 3D model of different minerals after threshold segmentation, and use statistical methods to divide multiple particle size distribution ranges, and add the particle size volume ratios of the corresponding types of mineral particles to obtain the volume fraction within the particle size distribution range of a certain type of mineral.

[0053] Step S203: Prepare mineral particles consistent with the mineral type, crush the mineral particles into different particle size ranges, convert the mineral volume fraction in the statistical data into mass fraction, and re-weigh different minerals according to the particle grading and mix them evenly for use.

[0054] Specifically, prepare mineral particles that are consistent with the mineral type of the rock sample, and use a crusher to crush the mineral particles into different particle size ranges. According to the particle size distribution range and proportion of different types of minerals inside the rock sample obtained in step S202, the crushed mineral particles are evenly mixed according to the corresponding particle sizes and proportions, so that the particle grading of the mixture (i.e., the required target mineral particles) is consistent with the corresponding minerals in the rock sample. At the same time, the volume fractions of different mineral types inside the rock sample obtained in step S202 are converted into mass fractions. Taking a certain rock as an example, it is composed of three minerals, represented by mineral A, mineral B, and mineral C, and the volume fractions of the three are respectively , and The corresponding densities are , and The volume fraction of pores in rocks is expressed as Therefore, we can get The volume ratio of the three minerals is , if the volume of the rock-like material mold required is known to be , then the mineral contents of the three required mineral particles are , and .

[0055] Place the corresponding mass and type of mineral particles into a Teflon-coated container and stir thoroughly to mix them. The Teflon-coated container is selected in this step because Teflon has an extremely low surface energy and good non-stick properties, which can effectively prevent the addition of polymers as binders in the subsequent steps from sticking to the inside and causing loss of raw materials. Figure 4 The scanning slice of a rock-like material obtained by this step, in which the mineral particles with the same particle size distribution as the minerals of the rock sample are subjected to the action of a polymer binder, is shown. Figure 1 It can be seen that the rock-like specimens made according to the particle grading relationship can better reflect the microstructural characteristics of the prototype rock.

[0056] Step S204: Use a single-component high molecular polymer as a binder, conduct multiple tests, and determine the optimal polymer volume fraction so that the rock-like material is closest to the prototype rock in terms of microscopic morphology.

[0057] Specifically, the purpose of this step is to determine the optimal volume fraction of the binder (i.e., the target volume fraction) so that the pore volume fraction of the solidified rock-like material is consistent with the pore volume fraction of the rock sample. The specific process is: A single-component high molecular polymer is used as a binder. When using a single-component polymer, no additional curing agent is required, and it can usually be cured at room temperature, which is more convenient to use. At the same time, the single-component polymer can better penetrate into the gaps and surfaces of rock particles. Compared with the two-component polymer mixing process, the mixing process may be uneven, which affects the bonding effect with mineral particles. The overall bonding of the single-component polymer is stronger. The optional polymer types in this step include acrylates, polyurethanes, liquid rosin resins, etc. Considering that the volume fraction has little to do with the polymer type, it is sufficient to select one of the typical single-component polymers (such as polyurethane) for the experiment. For example, the polyurethane volume fraction is used as the independent variable, and the rock-like material pore volume fraction is used as the dependent variable to carry out multiple groups of experiments. The specific operation is to add polyurethane of different volume fractions to a non-stick container (such as a Teflon-coated container in step S203) containing mixed mineral particles, and use a silicone stirring spatula to fully mix the polyurethane with the mineral particles in the container to ensure that each particle is evenly coated with polyurethane so that it can be fully cured to form strength later.

[0058] Put the stirred mixture into a plastic mold (the mold volume is ), fully mixed, vibrated, compacted and formed. This step uses a plastic mold because of its low cost. The polymer-type rock-like material has high strength and hardness after solidification, and it may be necessary to cut the mold for demoulding. The demoulding agents that can be used in this step include silicone oil demoulding agent, polytetrafluoroethylene demoulding agent, vaseline, etc.

[0059] The compacted rock-like material is placed in the air for curing, demolded after initial curing and cured for secondary curing until the hardness of the surrounding and bottom surfaces of the rock-like material is consistent with that of the top surface using a hardness tester, and there is no obvious change after multiple measurements, then the material is considered to be completely cured. This is because the top surface is exposed to the air and is completely cured first, with the fastest curing speed, while the surrounding and bottom surfaces are tightly wrapped by the mold and cure slowly.

[0060] The fully solidified rock-like material (i.e., the rock-like material used in the first experiment) is placed in the CT scanning system again, and the volume fraction of pores (i.e., porosity) is obtained by scanning. A response curve of the volume fraction of pores changing with the volume fraction of polymer is plotted, wherein the volume fraction of pores that is closest to the porosity of the rock sample is the optimal volume fraction of pores, and the volume fraction of polymer corresponding to the optimal volume fraction of pores is determined to be the optimal volume fraction of polymer (i.e., target volume fraction), so that the rock-like material is closest to the prototype rock in terms of microscopic morphology.

[0061] Step S205: With polymer type and curing temperature as independent variables, elastic modulus and Poisson's ratio as dependent variables, the response surface method is used to determine the optimal polymer and curing temperature according to the unified relationship between the elastic modulus ratio and the Poisson's ratio ratio, so that the rock-like material is closest to the target rock in mechanical performance.

[0062] Specifically, after determining the optimal volume fraction of the polymer binder, further experiments were carried out to determine the type of polymer. x 1 (acrylate, polyurethane, liquid rosin resin, etc.), curing temperature x 2 (normal temperature, 40℃, 60℃, 80℃, etc.) as the independent variable, and the mechanical index elastic modulus of the final sample (i.e., the second experimental rock material obtained using different binders) y 1 and Poisson's ratio y 2 is the dependent variable, and the response surface method is used to analyze the relationship between multiple independent variables and multiple dependent variables. A quadratic polynomial regression model is established, and the model can be expressed as: (3) In the formula, and is a constant term, is the coefficient of the first-order term, is the coefficient of the quadratic term, and is the interaction coefficient. The above model can describe the linear, quadratic and interaction relationship between the independent variable and the dependent variable. A large number of experiments are carried out to obtain enough data points to fit the model. After fitting the model, the three-dimensional surface graph is used to intuitively show the influence of polymer type and curing temperature on the mechanical properties of rock-like materials.

[0063] The optimal polymer type and curing temperature are determined through the proportional unity relationship between the elastic modulus and Poisson's ratio of the target rock, so that the rock-like material is closest to the target rock in mechanical performance.

[0064] The specific proportional unity relationship in this step is: the elastic modulus ratio and Poisson's ratio ratio are used to measure the similarity between similar materials and prototype rocks in terms of elastic deformation characteristics. Under complex stress conditions, the elastic modulus and Poisson's ratio jointly determine the distribution of stress and strain inside the material. For example, the elastic modulus of the prototype rock is E 1, Poisson's ratio is , the elastic modulus of rock-like materials is E 2, Poisson's ratio is . Then the elastic modulus ratio (i.e. the first ratio) is: C E = E 1 / E 2. Poisson's ratio (i.e. the second ratio): The two are unified, that is , which is conducive to accurately simulating the stress-strain relationship in the process of material stress, ensuring that the transmission mode of stress and strain in the model is consistent with that of the prototype rock, and the deformation coordination is similar, and then accurately reflects the failure mode and strength characteristics of the rock. Through this step, it can be ensured that the similar material is closest to the prototype rock in mechanical performance. Therefore, for the second experimental rock-like materials obtained using different binders, the target second experimental rock-like material set is screened out using the proportional uniformity relationship. The elastic modulus ratio of each target second experimental rock-like material in the target second experimental rock-like material set is equal to the respective Poisson's ratio ratio. The type of binder and the curing temperature corresponding to each target second experimental rock-like material are the target type and the target curing temperature.

[0065] Step S206: batch-produce rock-like materials, and calculate the strength ratios under different working conditions, respectively, to provide a basis for simulating the bearing capacity of the prototype rock under actual working conditions.

[0066] Specifically, after determining the optimal ratio parameters of the binder through steps S204 and S205, the rock-like material can be mass-produced, and the strength ratio under different loading conditions, that is, the ratio of the strength of the prototype rock to the strength of the rock-like material, can be calculated. After determining the strength ratio, the relationship between the strength characteristics of the rock-like material and the prototype rock can be established. For example, if the uniaxial compressive strength of the prototype rock is 100 MPa and the uniaxial compressive strength of the rock-like material is 10 MPa, then the uniaxial compressive strength ratio is The strength scale under different loading conditions can provide a basis for simulating the bearing capacity of prototype rocks in actual working conditions.

[0067] In an embodiment of the present invention, component information, porosity and mechanical information of a rock sample are obtained, wherein the component information includes the type, density, volume fraction and particle size range of the mineral, and the mechanical information includes the elastic modulus and Poisson's ratio; target mineral particles of the same type, volume fraction and particle size range are obtained based on the component information to obtain an experimental rock-like material; a target volume fraction of a binder is determined based on the porosity of the rock sample and the experimental rock-like material; a target type and a target curing temperature of the binder are determined based on the mechanical information of the rock sample and the experimental rock-like material; and at the target curing temperature, a binder of a target volume fraction under a target type is mixed, stirred and cured with target mineral particles to obtain a rock-like material corresponding to the rock sample. In this case, the type, density, volume fraction, and particle size range of the rock sample are fully considered to obtain the target mineral particles, and then the porosity, elastic modulus, and Poisson's ratio are comprehensively considered to obtain the target curing temperature and the target type of the target volume fraction of the binder. The rock-like material obtained by using the target mineral particles and the obtained binder is closer to the rock sample in terms of microscopic properties, and the consideration of the elastic modulus and Poisson's ratio makes the mechanical properties of the rock-like material closer to the rock sample. Therefore, the rock-like material obtained by the method of the present invention is closer to the microscopic properties and mechanical properties of rock.

[0068] The method of the present invention takes into account the consistency of morphology and mechanical behavior with the rock sample at the same time, and can simultaneously meet the similarity of microscopic morphology and mechanical behavior. The mechanical properties of rock depend to a large extent on its microstructure. The similarity of microscopic morphology can make the rock-like material simulate the structural characteristics of natural rock at the microscopic level, including the shape, distribution, cementation and pore structure of mineral particles, etc., which helps to more realistically reflect the evolution law of the mesostructure of rock under stress state and reveal the microscopic damage and destruction mechanism of rock. At the same time, the rock-like material exhibits mechanical properties similar to those of the prototype rock at a macroscopic level, which helps researchers to simulate the mechanical response of rock under complex working conditions more accurately through experimental research on rock-like materials, and provide a basis for engineering design and construction. In addition, for some large-scale experiments, the use of rock-like materials can reduce the cost of the experiment and avoid damage to the test equipment or personal injury caused by the sudden destruction of the rock in the real rock experiment. Because the strength of the rock-like material can be controlled by adjusting the ratio, and the mechanical properties are relatively stable, the risk controllability of the test process is more advantageous. For example, a real rock sample requires a stress of 300MPa to cause failure, while a rock-like material with a strength ratio of 10 can be destroyed at only 30MPa. When designing tests using rock-like materials, the load can be reduced, thereby reducing the possibility of risks.

[0069] Based on the above embodiments, the present invention further proposes a rock-like material. The rock-like material is prepared by the method proposed in the above rock-like material preparation method embodiment, and the rock-like material includes: target mineral particles and a binder with a target volume fraction under a target type.

[0070] Based on the above embodiments, the present invention proposes a method for making a rapid rock-like material. The method first forms a database: for a large number of different types of rock samples, the steps of the above method embodiments of the present invention are used to obtain the optimal ratio parameters of the binder corresponding to the rock sample, and then the parameter information of each type of rock sample (here, component information, porosity and mechanical information) and the corresponding optimal ratio parameters of the binder are input and stored to form a database; then the mapping relationship between the parameter information of each type of rock sample and the optimal ratio parameters of the corresponding binder is stored in an instruction or computer program; when it is necessary to make a rock-like material, after obtaining the parameter information of the rock sample, the processor can retrieve the mapping relationship based on the input parameter information to obtain the optimal ratio parameters of the corresponding binder, and then make the rock-like material. The process is fast and accurate, and the obtained rock-like material meets the similarity of microscopic morphology and mechanical behavior. The rapid rock-like material production method can automatically calculate and judge the optimal ratio of the rock-like material according to the microscopic parameters and mechanical properties of the prototype rock, and finally form a set of fast and efficient rock-like material production system.

[0071] In order to implement the above-mentioned embodiments, the present invention also proposes an electronic device, including: a processor, and a memory connected to the processor for communication; the memory stores computer execution instructions; the processor executes the computer execution instructions stored in the memory to implement the aforementioned method for rapid rock similar material production.

[0072] In order to implement the above-mentioned embodiment, the present invention also proposes a computer-readable storage medium, in which computer execution instructions are stored. When the computer execution instructions are executed by a processor, they are used to implement the aforementioned method for quickly producing rock similar materials.

[0073] In order to implement the above-mentioned embodiment, the present invention also proposes a computer program product, including a computer program, which, when executed by a processor, implements the aforementioned method for quickly making rock-similar materials.

[0074] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they contradict each other.

[0075] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0076] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0077] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0078] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or a combination thereof: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0079] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0080] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0081] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for producing a rock-like material, characterized in that: include: Obtaining component information, porosity and mechanical information of the rock sample, wherein the component information includes the type, density, volume fraction and particle size range of the mineral, and the mechanical information includes the elastic modulus and Poisson's ratio; Based on the component information, target mineral particles of the same type, volume fraction and particle size range are obtained to obtain rock-like materials for experiments; Determine the target volume fraction of the binder based on the porosity of the rock specimen and the experimental rock-like material; Determine the target type and target curing temperature of the binder based on the mechanical information of the rock specimen and the rock-like material used in the experiment; At the target solidification temperature, the target volume fraction of the binder under the target type is mixed, stirred and solidified with the target mineral particles to obtain a rock-like material corresponding to the rock sample.

2. The method for producing rock-like materials according to claim 1, characterized in that: Determine the target volume fraction of the binder based on the porosity of the rock specimen and the experimental rock-like material, including: After the target mineral particles are mixed, stirred and solidified with binders having different volume fractions, a plurality of rock-like materials for the first experiment are obtained; Obtaining the porosity of each first experimental rock material; The porosity difference between each first experimental rock-like material and the porosity of the rock sample is calculated respectively to obtain a minimum porosity difference; the volume fraction of the binder in the first experimental rock-like material corresponding to the minimum porosity difference is the target volume fraction.

3. The method for producing rock-like materials according to claim 1, characterized in that: Determine the target type and target curing temperature of the binder based on the mechanical information of the rock specimen and the rock-like material used in the experiment, including: According to different binder types and different curing temperatures, target mineral particles are mixed, stirred and cured with a binder having a target volume fraction, so as to obtain a second experimental rock-like material corresponding to each binder type and curing temperature; Obtaining mechanical information of each type of rock material used in the second experiment; The target type and target curing temperature of the binder are determined based on the ratio of the mechanical information of the rock-like material used in the second experiment to the mechanical information of the rock sample.

4. The method for producing rock-like material according to claim 3, characterized in that: Determining a target type and a target curing temperature of a binder based on a ratio of mechanical information of the rock-like material used in the second experiment to mechanical information of the rock sample includes: respectively calculating first ratios of the elastic modulus of the rock sample to the elastic modulus of each second experimental type rock material; respectively calculating second ratios of the Poisson's ratio of the rock sample to the Poisson's ratio of each second experimental type of rock material; Compare the first ratio and the second ratio corresponding to the same second experimental rock-like material to screen out a target second experimental rock-like material set whose first ratio is equal to the second ratio, and the type and curing temperature of the binder corresponding to each target second experimental rock-like material in the target second experimental rock-like material set are the target type and target curing temperature.

5. The method for producing rock-like material according to claim 1, characterized in that: Obtain composition information and porosity of rock samples, including: The rock sample is three-dimensionally scanned by using a CT scanning system to obtain three-dimensional scanning data; The component information and porosity of the rock sample are determined based on the three-dimensional scanning data.

6. The method for producing rock-like material according to claim 5, characterized in that: The CT scanning system adopts a dual-source dual-energy CT scanning system.

7. The method for producing rock-like material according to claim 5, characterized in that: Determining the component information and porosity of the rock sample based on the three-dimensional scanning data includes: Determine the type and density of minerals in the rock sample based on the three-dimensional scanning data; Three-dimensional reconstruction is performed based on the three-dimensional scanning data to obtain the porosity of the rock sample, as well as the particle size ranges and corresponding volume fractions of different types of minerals.

8. The method for producing rock-like material according to claim 7, characterized in that: Obtaining target mineral particles of the same type, volume fraction and particle size range based on the component information includes: Obtaining initial mineral particles consistent with the type of minerals in the rock sample; A crusher is used to crush various types of initial mineral particles into different particle size ranges to screen out target mineral particles, wherein the type of target mineral particles, the volume fraction of each type of mineral, and the particle size range are consistent with those of the rock sample.

9. The method for producing rock-like material according to claim 1, characterized in that: The binder used is a polymer binder.

10. A rock-like material, characterized in that: The rock-like material is prepared by the method for preparing a rock-like material according to any one of claims 1 to 9, and the rock-like material comprises: target mineral particles and a binder of a target volume fraction under a target type.

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