Testing device for solute transport of three-dimensional network fracture model

Abstract

The utility model discloses a solute transport test device taking a three-dimensional network fracture model as an object, which comprises a network fracture cylinder model, a main body mold, a water storage device, an injection device, a liquid inlet pipe, an outlet pipe, a pressure measuring device, a collecting device and a pressurizing device, the main body mold comprises an inlet mold plate, a rubber gasket, a central cylinder mold and an outlet mold plate, and the mold plate, the rubber gasket and the cylinder mold are all provided with limiting round holes and are fixedly mounted through the limiting round holes, so that the mold is convenient to mount and dismount. According to the utility model, a solution or pure water with a certain concentration is injected into the network fracture theme model, and solute transport and displacement processes in the three-dimensional network fracture are studied. The main body mold part of the device can be repeatedly disassembled and assembled, and network fracture model cylinders with different geometric structures can be placed in the main body mold part. The device can be used for network fracture solute transport research, and is accurate in experimental data, low in cost, capable of being repeatedly disassembled and convenient to use.

Description

Technical Field

[0001] This invention belongs to the field of solute transport technology in fractured media, specifically an experimental device for solute transport in a three-dimensional network fracture model. Background Technology

[0002] As an important component of groundwater, fissure water is widely distributed in bedrock, and its occurrence and migration are characterized by complex spatial structures and variable flow patterns, making it susceptible to pollution. Therefore, studying the mechanisms of groundwater and solute migration in fissure media is of great significance for effectively preventing groundwater pollution and protecting water resources.

[0003] Current experimental setups for solute transport in fractured media are mainly designed for simple single-fracture structures, such as smooth parallel plates simulating solute transport in single fractures. For solute transport in complex network fractures, there is still a lack of suitable experimental setups to meet research needs. With the development and widespread adoption of 3D printing technology, random network fractures can be constructed using 3D printing to obtain network fracture cylinder models. Therefore, constructing an experimental setup suitable for solute transport in three-dimensional network fractures can meet the needs of further research on solute transport in fractured media and promote the development of related research fields. Utility Model Content

[0004] Purpose of the utility model: In view of the above problems, the purpose of this utility model is to provide a highly reliable, simple, economical, and detachable three-dimensional network fracture solute transport test device.

[0005] Technical solution: To achieve the purpose of this utility model, this utility model proposes an experimental device for solute transport in a three-dimensional network fracture model. The experimental device includes a network fracture column model (1), a main mold (2), a water storage device (3), an injection device (4), a pressure measuring device (7), a collection device (8), and a pressurizing device (9). The network fracture column model (1) is placed in a detachable main mold (2). The main mold (2) is connected to the water storage device (3) through a liquid inlet pipe (5). The pressurizing device (9) is provided on the liquid inlet pipe (5).

[0006] The injection device (4) is connected to the water storage device (3); the main mold (2) is connected to the collection device (8) through the outlet pipe (6), and a pressure measuring device (7) is provided at one end of the main mold (2) connected to the liquid inlet pipe (5).

[0007] The collection device (8) is an automatic collector that can automatically rotate the test tube tray and accurately align the tubes through program control, and automatically collect the solution flowing out of the outlet tube (6) at regular intervals and in quantitative quantities, thereby realizing the automatic collection of the solution flowing out of the experimental device at a set time sequence.

[0008] The main mold (2) is connected to the water storage device (3) through the liquid inlet pipe (5). The solute is injected into the water storage device (3) through the injection device (4) to control the solution concentration. The solution is introduced into the network fracture column model (1) in the main mold (2) through the liquid inlet pipe (5) by the pressurizing device (9) at a stable speed. The solution is connected to the collection device (8) through the outlet pipe (6) and the pressure difference between the two ends of the mold is measured by the pressure measuring device (7).

[0009] Furthermore, the network crack column model (1) is fitted to the inner wall of the central column mold (12) of the main body mold (2).

[0010] Furthermore, the main mold (2) includes an inlet template (10), a central column mold (12), and an outlet template (13). A rubber gasket (11) is provided between the inlet template (10) and the central column mold (12), and a rubber gasket (11) is provided between the outlet template (13) and the central column mold (12) to ensure the overall sealing of the model after assembly.

[0011] The inlet template (10), rubber gasket (11), central column mold (12), and outlet template (13) are provided with limiting holes (14); the inlet template (10) and rubber gasket (11) are stacked and fixed to one end of the central column mold (12) by inserting hexagonal bolts (15) into the limiting holes (14); the outlet template (13) and rubber gasket (11) are stacked and fixed to the other end of the central column mold (12) by inserting hexagonal bolts (15) into the limiting holes (14).

[0012] Furthermore, the network fracture column model (1) is provided with a network fracture model inlet section (16) and a network fracture outlet section (17) at both ends. The network fracture model inlet section (16) is opposite to the inlet template (10), and the network fracture outlet section (17) is opposite to the outlet template (13).

[0013] Furthermore, the inlet template (10) is provided with an inlet (18), and the outlet template (13) is provided with an outlet (19). The inlet (18) is connected to the liquid inlet pipe (5), and the outlet (19) is connected to the outlet pipe (6).

[0014] Beneficial effects: Compared with the prior art, the technical solution of this utility model has the following beneficial technical effects:

[0015] (1) This utility model is a three-dimensional network fracture solute transport test device. The main mold part of the device is made of acrylic material, which has good acid, alkali and corrosion resistance, good light transmission performance, and can be directly observed through the mold to observe the transport of solution in the fracture model.

[0016] (2) The main mold part of the device includes an inlet template, a rubber gasket, a central column mold, and an outlet template. After assembly, the whole is sealed and waterproof. After the test, it can be disassembled to place different network fracture column models, so as to study the differences in solute transport characteristics in network fractures with different geometric structures. This utility model has a simple structure, is easy to install, has low cost, and is highly adaptable to equipment modification. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the experimental device of this utility model;

[0018] Figure 2 This is a schematic diagram of the specific structure of the main mold and the network crack column model in this utility model;

[0019] The labels in the diagram are as follows: 1-Network fracture column model, 2-Main mold, 3-Water storage device, 4-Injection device, 5-Injection pipe, 6-Outlet pipe, 7-Pressure measuring device, 8-Collection device, 9-Pressure device, 10-Inlet template, 11-Rubber gasket, 12-Central column mold, 13-Outlet template, 14-Limiting hole, 15-Hex bolt, 16-Network fracture model inlet section, 17-Network fracture outlet section, 18-Inlet, 19-Outlet. Detailed Implementation

[0020] This invention discloses a three-dimensional network fracture solute transport experimental device, which can study the solute transport characteristics within different network fracture models under different pressure conditions. The technical solution will be fully described and explained below with reference to the accompanying drawings.

[0021] like Figure 1 and Figure 2 As shown, this utility model proposes an experimental device for solute transport in a three-dimensional network fracture model. The experimental device includes a network fracture column model (1), a main mold (2), a water storage device (3), an injection device (4), a pressure measuring device (7), a collection device (8), and a pressurizing device (9). The network fracture column model (1) is placed in a detachable main mold (2), and the main mold (2) is connected to the water storage device (3) through a liquid inlet pipe (5). The pressurizing device (9) is provided on the liquid inlet pipe (5).

[0022] The injection device (4) is connected to the water storage device (3); the main mold (2) is connected to the collection device (8) through the outlet pipe (6), and a pressure measuring device (7) is provided at one end of the main mold (2) connected to the liquid inlet pipe (5).

[0023] The collection device (8) is an automatic collector that can automatically rotate the test tube tray and accurately align the tubes through program control, and automatically collect the solution flowing out of the outlet tube (6) at regular intervals and in quantitative quantities, thereby realizing the automatic collection of the solution flowing out of the experimental device at a set time sequence.

[0024] Furthermore, the network crack column model (1) is fitted to the inner wall of the central column mold (12) of the main body mold (2).

[0025] Furthermore, the main mold (2) includes an inlet template (10), a central column mold (12), and an outlet template (13). A rubber gasket (11) is provided between the inlet template (10) and the central column mold (12), and a rubber gasket (11) is provided between the outlet template (13) and the central column mold (12).

[0026] The inlet template (10), rubber gasket (11), central column mold (12), and outlet template (13) are provided with limiting holes (14); the inlet template (10) and rubber gasket (11) are stacked and fixed to one end of the central column mold (12) by inserting hexagonal bolts (15) into the limiting holes (14); the outlet template (13) and rubber gasket (11) are stacked and fixed to the other end of the central column mold (12) by inserting hexagonal bolts (15) into the limiting holes (14).

[0027] Furthermore, the network fracture column model (1) is provided with a network fracture model inlet section (16) and a network fracture outlet section (17) at both ends. The network fracture model inlet section (16) is opposite to the inlet template (10), and the network fracture outlet section (17) is opposite to the outlet template (13).

[0028] Furthermore, the inlet template (10) is provided with an inlet (18), and the outlet template (13) is provided with an outlet (19). The inlet (18) is connected to the liquid inlet pipe (5), and the outlet (19) is connected to the outlet pipe (6).

[0029] The water storage device (3) of this utility model is connected to an injection device (4), which can inject solute into the water tank to prepare a solution of a certain concentration. The solution is injected into the model through the inlet pipe at a certain flow rate by the pressurizing device (9). The pressurizing device can adjust the pressure to study the difference in solute transport in the network cracks under different flow rates. At the same time, the pressure difference between the two ends of the mold can be measured by the pressure measuring device (7) to study the difference in solute transport in the network cracks under different head differences.

[0030] The main mold of the experimental device consists of an inlet template (10), a central column mold (12), and an outlet template (13). Rubber gaskets (11) are provided between the inlet and outlet templates and the central column mold to provide protection, prevent wear between the molds during fixing, and increase sealing. Each part is provided with a limiting hole (14). After the three-dimensional network fracture column model is installed in the mold, it can be fixed by inserting hexagonal bolts (15) into the limiting hole (14). After assembly, the entire mold is sealed and waterproof. After a set of tests is completed, the mold can be disassembled, the three-dimensional network fracture column model can be taken out, and a new column model with a network fracture with a different geometric structure can be placed in it. The mold can then be reinstalled and fixed for the next set of tests to study the influence of the network fracture geometry on solute transport.

[0031] In this invention, the diameter of the three-dimensional network crack column model 1 is 100mm and the length is 100mm. The three-dimensional network cracks in the model are randomly generated and the model is constructed by 3D printing technology. The inner diameter of the central column mold (12) is 100mm, so that the network crack column model fits tightly with the inner wall after being installed in it. The diameter of the inlet (17) and outlet (14) on the main mold is the same as the inner diameter of the liquid inlet pipe (5) and the water outlet pipe (6), which is 10mm. The specific length of the liquid inlet pipe and the water outlet pipe can be adjusted according to the actual experimental situation.

[0032] The main mold of this invention is made of acrylic material, which has good resistance to acid, alkali and corrosion, and good light transmittance, allowing direct observation of the movement of the solution in the fracture model through the mold. The materials of the inlet pipe and outlet pipe have good high temperature and low temperature resistance, good stability, strong resilience and small permanent deformation. The materials selected in this invention meet the test requirements and are economical and practical, saving costs.

[0033] In this utility model, the inlet template (10), the central column mold (12), and the outlet template (13) are fixed by inserting hexagonal bolts into the limiting round holes. The whole assembly is easy to install, has good sealing performance, and is easy to disassemble.

[0034] The number of the limiting holes can be set to multiple, which can be set according to the actual situation. In addition, after assembly, waterproof tape or Vaseline can be wrapped around the outside of the mold to increase the sealing.

[0035] The specific workflow of this utility model is as follows: Figure 1 The experimental apparatus is connected to each other and placed on the experimental platform after installation. Appropriate operating parameters are set for the injection device (4), pressurizing device (9), and collection device (8). During the experiment, the injection device (4) injects the solute into the water storage device (3) according to the set dosage, and the pressurizing device (9) introduces the solution into the main mold (2) according to the set pressure. The pressure difference between the two ends of the mold is measured by the pressure measuring device (7). The solution flowing out of the device is collected by the collection device (8) according to the set time sequence. The concentration of the solution collected by the collection device (8) is measured, and the concentration at the outlet is stabilized at the level introduced into the main mold. After a period of time, the injection device (4) is turned off, the solution in the water storage device is replaced with deionized water, and the process of solute being displaced by pure water begins. At the same time, the solution at the outlet is continuously collected and observed through the collection device (8) until the concentration value stabilizes to near zero for a period of time, and the experiment ends. The experimental device is disassembled and cleaned, the three-dimensional network fracture column model (1) is replaced, and the next model is installed in the center of the main mold (2). The above steps are repeated to carry out solute transport experiments of different network fracture models. After all the experiments are completed, the experimental device is disassembled and cleaned, and the workbench is tidied up.

[0036] This invention can change the flow rate or pressure of the solution introduced into the model and measure the pressure difference between the two ends of the model. At the same time, the main mold can be disassembled, which facilitates comparative studies of different network fracture models and meets the specific needs of solute transport research in three-dimensional network fractures.

[0037] This utility model has a novel concept, simple design, is easy to manufacture and install, has low cost, and is highly adaptable to equipment modification. It has good application prospects in the field of network fracture solute transport research.

Claims

1. An experimental apparatus for solute transport in a three-dimensional network fracture model, characterized in that, The experimental apparatus includes a network fracture column model (1), a main mold (2), a water storage device (3), an injection device (4), a pressure measuring device (7), a collection device (8), and a pressurizing device (9); the network fracture column model (1) is placed in the detachable main mold (2), the main mold (2) is connected to the water storage device (3) through a liquid inlet pipe (5), and the pressurizing device (9) is provided on the liquid inlet pipe (5); The injection device (4) is connected to the water storage device (3); the main mold (2) is connected to the collection device (8) through the outlet pipe (6), and a pressure measuring device (7) is provided at one end of the main mold (2) connected to the liquid inlet pipe (5).

2. The experimental apparatus for solute transport in a three-dimensional network fracture model according to claim 1, characterized in that, The network fissure column model (1) is fitted to the inner wall of the central column mold (12) of the main mold (2).

3. The experimental apparatus for solute transport in a three-dimensional network fracture model according to claim 2, characterized in that, The main mold (2) includes an inlet template (10), a central column mold (12) and an outlet template (13). A rubber gasket (11) is provided between the inlet template (10) and the central column mold (12), and a rubber gasket (11) is provided between the outlet template (13) and the central column mold (12). The inlet template (10), rubber gasket (11), central column mold (12), and outlet template (13) are provided with limiting holes (14); the inlet template (10) and rubber gasket (11) are stacked and fixed to one end of the central column mold (12) by inserting hexagonal bolts (15) into the limiting holes (14); the outlet template (13) and rubber gasket (11) are stacked and fixed to the other end of the central column mold (12) by inserting hexagonal bolts (15) into the limiting holes (14).

4. The experimental apparatus for solute transport in a three-dimensional network fracture model according to claim 3, characterized in that, The network fracture column model (1) has a network fracture model inlet section (16) and a network fracture outlet section (17) at both ends. The network fracture model inlet section (16) is opposite to the inlet template (10), and the network fracture outlet section (17) is opposite to the outlet template (13).

5. An experimental apparatus for solute transport in a three-dimensional network fracture model according to claim 3 or 4, characterized in that, The inlet template (10) is provided with an inlet (18), and the outlet template (13) is provided with an outlet (19). The inlet (18) is connected to the liquid inlet pipe (5), and the outlet (19) is connected to the outlet pipe (6).

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