A quantitative preparation method for three-dimensional electrical model for electrical physics simulation

Abstract

The present invention belongs to the field of electrical simulation technology, and in particular relates to a method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation. In the quantitative preparation process of the three-dimensional electrical model, the present invention first establishes a digital model of the outer contour of the geological body to be simulated, then obtains the outer contour entity of the three-dimensional electrical model containing an internal cavity through 3D printing, and then fills the cavity of the outer contour entity with a prepared aqueous solution to complete the preparation of the three-dimensional electrical model; the prepared model has authenticity and high preparation accuracy, and can realize the preparation of three-dimensional complex electrical models, greatly expanding the scope of application of electrical physical simulation technology; at the same time, according to different geological bodies to be simulated, multiple three-dimensional electrical models can be set, and each three-dimensional electrical model is independent of each other and can be flexibly combined and used. The relative positions between the models can be independently adjusted, and the resistivity of each model can also be independently adjusted, which has strong applicability.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical simulation, and in particular relates to a method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation. Background Art

[0002] Electrical simulation is a simulation method based on the principle of similarity between models and prototypes. It uses laboratory experiments to obtain forward modeling results of the prototype's geoelectric field. Compared to numerical simulations, it is more realistic and is an important means of studying geoelectric field response patterns. Currently, the models widely used in geophysical electrical simulation experiments are mostly good conductors or high-resistance objects with simple regular shapes such as columns, plates, and spheres. These models have the common drawback of being unable to construct realistic three-dimensional complex electrical models, which greatly limits the application of electrical simulation technology in complex three-dimensional geoelectric environments.

[0003] At the same time, existing techniques for simulating transient electromagnetic (TEM) in complex coal mine goafs have attempted to create 3D electrical models using similar simulating materials such as sand, lime, gypsum, and water. These materials are then scaled down and manually laid out in acrylic glass frames to create 3D electrical models. However, these 3D electrical models have several drawbacks: 1) The resistivity of the model materials made with simulating materials such as sand and lime is difficult to adjust and quantitatively control, and it is also difficult to create low-resistance models. According to the principle of similarity in electromagnetic physical simulation, when the physical size is reduced, the model resistivity must also be reduced compared to the prototype. If low-resistance models are difficult to create, the application scenarios that can be simulated will be significantly limited. 2) The 3D model is manually laid out layer by layer, making it difficult to accurately and quantitatively control the shape of the 3D model according to design requirements, especially when the model's contours are complex. Because this method makes it difficult to precisely control the resistivity and contours of the 3D electrical models, current physical simulations of 3D electrical models struggle to accurately and quantitatively simulate the electromagnetic response. Furthermore, the 3D models produced using this method are monolithic, bulky entities that are difficult to move after assembly, easily damaged, and difficult to disassemble and reuse. Therefore, developing a flexible and lightweight model preparation method that can precisely control the resistivity and contours of 3D electrical models to meet the needs of quantitative physical simulation of complex 3D electrical models using electrical methods is an urgent challenge in this field. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned background technology, the present invention provides a method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation to solve the above-mentioned problems existing in the prior art.

[0005] The present invention provides a method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation, comprising the following steps:

[0006] S1: digitizing the geological body to be simulated in three dimensions to establish a digital model of the outline of the geological body to be simulated;

[0007] S2: scaling down the digital model of the contour of the geological body to be simulated to form the three-dimensional electrical model;

[0008] S3: inputting the three-dimensional electrical model into a 3D printer, and using conductive PLA material to obtain a solid body of the three-dimensional electrical model including an inner cavity through 3D printing;

[0009] S4: placing the outline entity containing the cavity in a designated spatial position of the soil trough, and filling the surrounding area of the outline entity with soil to serve as background surrounding rock;

[0010] S5: According to the similarity principle, determine the resistivity of the aqueous solution to be prepared, and use a conductivity meter to quantitatively prepare one or more aqueous solutions with specified resistivity;

[0011] S6: Using a peristaltic pump, extracting a quantitatively configured aqueous solution to fill the cavity of the outline entity, thereby completing the preparation of the three-dimensional electrical model.

[0012] Preferably, the step S2 of scaling down the digital model of the contour of the geological body to be simulated to form the three-dimensional electrical model specifically includes:

[0013] S2.1: Determine the size reduction ratio between the digital model of the contour of the geological body to be simulated and the three-dimensional electrical model;

[0014] Preferably, the size reduction ratio of the digital model of the contour of the geological body to be simulated and the three-dimensional electrical model is determined according to the similarity principle.

[0015] Preferably, the size reduction ratio of the digital model of the geological body to be simulated and the three-dimensional electrical model is set to 100:1.

[0016] It is worth emphasizing that other size reduction ratios can be selected as needed.

[0017] S2.2: According to the size reduction ratio, the digital model of the outline of the geological body to be simulated is reduced to form the three-dimensional electrical model.

[0018] Preferably, in S3, in order to facilitate subsequent water injection to fill the cavity of the outline, two small circular holes are designed on the top of the outline entity of the three-dimensional electrical model, which are an injection hole and an exhaust hole respectively.

[0019] Specifically, the two small circular holes have a diameter of 0.6 to 1 cm;

[0020] Furthermore, if there are multiple geological bodies to be simulated, digital models corresponding to the geological bodies to be predicted are respectively established, and then the outline entities of the three-dimensional electrical models corresponding to the digital models of the geological bodies to be predicted are 3D printed.

[0021] Preferably, in S3, the diameter of the conductive PLA material is 1.75 mm, the positioning accuracy of the 3D printer is 0.1 mm, the printing thickness of the outline is 5 mm, and the size ratio of the digital model of the outline of the geological body to be simulated and the three-dimensional electrical model is set to 100:1.

[0022] Conductive PLA is an ideal choice of 3D printing material. It is made from a combination of PLA (polylactic acid) and conductive carbon black.

[0023] Preferably, in S4, before water injection, the outer contour entity is first placed in an earth trough. On the one hand, without water injection, the outer contour entity is light in weight and easy to move and place. Moreover, the outer contour entity is filled with soil or other materials around it, which can play a good supporting and protective role. In this way, the outer contour entity is not easy to break after water injection.

[0024] Preferably, if there are multiple outline entities, they need to be placed separately according to the experimental design.

[0025] Preferably, in S5, the resistivity of the aqueous solution to be prepared is determined according to the resistivity of the geological body to be simulated, and the aqueous solution is used to simulate the geological body to be simulated.

[0026] The present invention has the following technical effects:

[0027] In the process of preparing the three-dimensional electrical model of the present invention, the resistivity and external contour of the three-dimensional electrical model can be precisely controlled, the prepared model has authenticity and high preparation accuracy, and the preparation of three-dimensional complex electrical models can be realized, which greatly expands the scope of application of electrical physical simulation technology.

[0028] At the same time, in the process of preparing the three-dimensional electrical model, the present invention first prints out the outer contour cavity of the three-dimensional electrical model corresponding to the geological body to be simulated through 3D printing technology, and then injects a prepared aqueous solution into the outer contour cavity, thereby achieving precise control of the resistivity of the three-dimensional electrical model. In addition, since the injected solution is the prepared aqueous solution, precise adjustment of the resistivity of the three-dimensional electrical model can also be achieved.

[0029] In addition, multiple 3D electrical models can be set up to simulate different geological bodies. Each 3D electrical model is independent of each other and can be flexibly combined and used. The relative positions of the models can be adjusted independently, and the resistivity of each model can also be adjusted independently. This makes the model highly adaptable, flexible, and easy to maintain. Furthermore, the model is lightweight and easy to transport, install, disassemble, and reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a quantitative preparation method of a three-dimensional electrical model for electrical physical simulation provided in an embodiment of the present application;

[0031] Figure 2 These are digital models of three-dimensional complex-shaped geological bodies from four different perspectives (a), (b), (c), and (d) provided in the embodiments of this application. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] As mentioned in the background technology, in response to the problems in the existing technology, this application proposes a quantitative preparation method of a three-dimensional electrical model for electrical physical simulation, which is used to achieve precise control of the resistivity and external contour of the prepared model during electrical physical simulation.

[0034] The following is combined with Figure 1 The present invention provides a method for quantitatively preparing a three-dimensional electrical model for geophysical electrical simulation, which is described in further detail using a three-dimensional ore body prototype in a certain area as an example. The method is characterized by comprising the following steps:

[0035] S1: digitizing the geological body to be simulated in three dimensions to establish a digital model of the outline of the geological body to be simulated;

[0036] For example, Figure 2 As shown, attached Figure 2 The digital models of a three-dimensional complex-shaped geological body from four different perspectives (a), (b), (c), and (d) are shown. In this embodiment, the geological body is a three-dimensional complex-shaped ore body, which extends about 90 m in the east-west direction, about 70 m in the south-north direction, and about 60 m in the vertical direction. The resistivity of the geological body to be simulated is 20 Ω.m.

[0037] S2: scaling down the digital model of the contour of the geological body to be simulated to form the three-dimensional electrical model;

[0038] In this embodiment, S2 specifically includes:

[0039] S2.1: Determine the size reduction ratio between the digital model of the contour of the geological body to be simulated and the three-dimensional electrical model;

[0040] In fact, generally, the size of the geological body to be simulated is large, so the size of the digital model of its outline is also large. It is necessary to reduce the digital model of the outline of the geological body to be simulated by a fixed ratio to form a three-dimensional electrical model.

[0041] In this embodiment, the size reduction ratio of the digital model of the contour of the geological body to be simulated and the three-dimensional electrical model is determined based on the similarity principle.

[0042] In this embodiment, the size reduction ratio of the digital model of the outline of the geological body to be simulated and the three-dimensional electrical model is set to 100:1. It is worth emphasizing that in other embodiments, other size reduction ratios can be selected as needed. For example, the size reduction ratio of the digital model of the outline of the geological body to be simulated and the three-dimensional electrical model is set to 200:1 or 300:1.

[0043] S2.2: According to the size reduction ratio, the digital model of the outline of the geological body to be simulated is reduced to form the three-dimensional electrical model.

[0044] S3: Inputting the three-dimensional electrical model into a 3D printer, and using conductive PLA material to obtain an outer contour entity of the three-dimensional electrical model containing an inner cavity through 3D printing.

[0045] In S3, in order to facilitate subsequent water injection to fill the cavity of the outline, two small circular holes are designed on the top of the outline entity of the three-dimensional electrical model, which are an injection hole and an exhaust hole respectively.

[0046] Specifically, the two small circular holes have a diameter of 0.6 to 1 cm;

[0047] Furthermore, if there are multiple geological bodies to be simulated, digital models corresponding to the geological bodies to be predicted are respectively established, and then the outline entities of the three-dimensional electrical models corresponding to the digital models of the geological bodies to be predicted are 3D printed.

[0048] In this example, the conductive PLA material has a diameter of 1.75 mm, the 3D printer has a positioning accuracy of 0.1 mm, and the printed outline has a thickness of 5 mm. The digital model of the geological body to be simulated and the 3D electrical model have a scale ratio of 100:1. The printed outline spans approximately 0.9 m in the east-west direction, approximately 0.7 m in the south-north direction, and approximately 0.6 m in the vertical direction. The physical 3D electrical model outline is identical in appearance to the digital model of the geological body to be simulated, scaled down 100 times.

[0049] S4: placing the outline entity containing the cavity in a designated spatial position of the soil trough, and filling the surrounding area of the outline entity with soil to serve as background surrounding rock;

[0050] Before water injection, the outer contour entity is first placed in the soil trough. On the one hand, without water injection, the outer contour entity is light in weight and easy to move and place. In addition, the outer contour entity is filled with soil and other materials around it, which can play a good supporting and protective role. In this way, the outer contour entity is not easy to break after water injection.

[0051] In this embodiment, only one outline entity needs to be placed. In other embodiments, if there are multiple outline entities, they need to be placed separately according to the experimental design.

[0052] S5: According to the similarity principle, determine the resistivity of the aqueous solution to be prepared, and use a conductivity meter to quantitatively prepare one or more aqueous solutions with specified resistivity.

[0053] From the above introduction, it can be seen that the resistivity of the geological body to be simulated is 20Ω.m. That is to say, if the resistivity of the geological body to be simulated is known, the resistivity of the aqueous solution to be prepared can be determined according to the resistivity of the geological body to be simulated, and the aqueous solution can be used to simulate the geological body to be simulated;

[0054] The resistivity of ordinary pure water is 1000~10000Ω.m, and the limit resistivity of saturated salt water solution is 0.05Ω.m. Adding salt to ordinary pure water can prepare an aqueous solution with a resistivity in the range of 0.05~1000Ω.m, which meets the use range of the resistivity of physical simulation similarity materials. The resistivity measurement range of the conductivity meter is 0.01~200mS / cm, that is, 0.05~1000Ω.m, which meets the quantitative measurement requirements of the resistivity of aqueous solutions. In this embodiment, taking transient electromagnetic physical simulation as an example, since the scale ratio of the prototype and the model is 100:1, assuming that the time scale ratio is also 100:1, then the resistivity scale ratio of the geological body to be simulated and the three-dimensional electrical model should also be 100:1. In this embodiment, there is only one geological body to be simulated, and its resistivity is 20Ω.m. According to the resistivity reduction ratio, an aqueous solution with a resistivity of 0.2Ω.m should be quantitatively prepared;

[0055] S6: using a peristaltic pump to extract a quantitatively configured aqueous solution to fill the cavity of the outline entity, thereby completing the preparation of the three-dimensional electrical model.

[0056] In this example, the peristaltic pump's inlet rubber hose was first placed in a 0.2 Ω·m aqueous solution. The outlet rubber hose was then inserted into the model's water inlet and lowered to the very bottom of the contoured solid cavity to ensure smooth air expulsion during water injection. Using an adjustable-speed peristaltic pump (flow rate range: 75–600 ml / min), the aqueous solution was slowly injected into the contoured solid cavity until the cavity was completely filled.

[0057] When the outer contour entity has a complex structure, especially when it consists of many small cavities, it should be injected at a low flow rate to ensure that the air can be completely discharged in a timely manner.

[0058] This embodiment also provides a quantitative application method of a three-dimensional electrical model, which uses the above steps to obtain the three-dimensional electrical model.

[0059] Then, the three-dimensional electrical model is applied to physical simulation experiments;

[0060] After the physical experiment is completed, the peristaltic pump is used again to pump the aqueous solution out of the cavity of the contour entity;

[0061] Then, the outer contour entity of the model is taken out from the soil trough or the sand trough, completing the disassembly of the three-dimensional electrical model for next reuse.

[0062] This method generates a three-dimensional electrical model corresponding to the geological body to be simulated. Furthermore, the resistivity of this three-dimensional electrical model can be quantitatively set, resulting in high-precision preparation, enabling the preparation of complex three-dimensional electrical models. This significantly expands the scope of application of electrical physics simulation technology. Furthermore, the modular design allows for the creation of multiple independent three-dimensional electrical models, tailored to the geological body to be simulated. These models can be flexibly combined, their relative positions independently adjusted, and their resistivity independently adjusted, making them highly adaptable, flexible, and easy to maintain. Furthermore, the model is lightweight and easy to transport, install, disassemble, and reuse.

[0063] It should be noted that the terms used in this application are only for describing specific embodiments and are not intended to limit the scope of this application. As shown in the specification and claims of this application, unless the context clearly indicates an exception, the words "one", "an", "a kind of" and / or "the" do not specifically refer to the singular and may also include the plural. The terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of further restrictions, the elements defined by the sentence "comprise a..." do not exclude the presence of other identical elements in the process, method or device comprising the elements.

[0064] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and do not impose any form of limitation on the implementation methods of the technology of the present invention. Any person skilled in the art may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

[0066] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of this application, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation, characterized in that: The following steps are involved: S1: digitizing the geological body to be simulated in three dimensions to establish a digital model of the outline of the geological body to be simulated; S2: scaling down the digital model of the contour of the geological body to be simulated to form the three-dimensional electrical model; S3: inputting the three-dimensional electrical model into a 3D printer, and using conductive PLA material to obtain a solid body of the three-dimensional electrical model including an inner cavity through 3D printing; S4: placing the outline entity containing the cavity in a designated spatial position of the soil trough, and filling the surrounding area of the outline entity with soil to serve as background surrounding rock; S5: Determine the resistivity of the aqueous solution to be prepared based on the similarity principle, and quantitatively prepare one or more aqueous solutions of specified resistivity using a conductivity meter; In S5, the resistivity of the aqueous solution to be prepared is determined based on the resistivity of the geological body to be simulated, and the aqueous solution is used to simulate the geological body to be simulated; S6: Using a peristaltic pump, extracting a quantitatively configured aqueous solution to fill the cavity of the outline entity, thereby completing the preparation of the three-dimensional electrical model.

2. The method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation according to claim 1, characterized in that: S2 scaling down the digital model of the contour of the geological body to be simulated to form the three-dimensional electrical model specifically includes: S2.1: Determine the size reduction ratio between the digital model of the contour of the geological body to be simulated and the three-dimensional electrical model; S2.2: According to the size reduction ratio, the digital model of the outline of the geological body to be simulated is reduced to form the three-dimensional electrical model.

3. The method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation according to claim 2, characterized in that: The size reduction ratio of the digital model of the outline of the geological body to be simulated and the three-dimensional electrical model is determined based on the similarity principle.

4. The method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation according to claim 3, characterized in that: The size reduction ratio of the digital model of the outline of the geological body to be simulated and the three-dimensional electrical model is set to 100:

1.

5. The method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation according to claim 1, characterized in that: In S3, two small circular holes are designed on the top of the outer contour entity of the three-dimensional electrical model, which are an injection hole and an exhaust hole respectively.

6. The method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation according to claim 5, characterized in that: The diameters of the two small circular holes are 0.6-1 cm.

7. The method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation according to claim 1, characterized in that: If there are multiple geological bodies to be simulated, digital models corresponding to the geological bodies to be simulated are respectively established, and then the outline entities of the three-dimensional electrical models corresponding to the digital models of the geological bodies to be simulated are 3D printed.

8. The method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation according to claim 1, characterized in that: In S3, the diameter of the conductive PLA material is 1.75 mm, the positioning accuracy of the 3D printer is 0.1 mm, and the printing thickness of the outer contour is 5 mm.

9. The method for quantitatively preparing a three-dimensional electrical model for electrical physical simulation according to claim 1, characterized in that: In said S4, before water injection, the outer contour entity is first placed in the soil trough. If there are multiple outer contour entities, they need to be placed separately according to the experimental design.

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