A simple test device for permeability coefficient of fractured media

Abstract

This utility model relates to the field of testing equipment technology, specifically a simple testing device for the permeability coefficient of fractured media. The testing device provided by this utility model includes a two-dimensional test chamber for containing fractured media and the inflow of water. A water valve is located at the bottom of the two-dimensional test chamber for collecting outflow flow data. It also includes an overflow tank located on one side of the top of the two-dimensional test chamber, test pieces distributed on both sides of the two-dimensional test chamber, and a support component for supporting the bottom of the two-dimensional test chamber. It records outflow flow data, top head data, and pressure head data on both sides, and calculates the permeability coefficient at different heights on both sides of the medium using Darcy's law. This invention uses a simple and low-cost two-dimensional testing device that can simultaneously achieve constant head control, automatic multi-point head monitoring, and simple analysis of fracture distribution, meeting the rapid diagnostic needs of engineering scenarios such as slope stability assessment and tailings dam seepage prevention detection.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically a simple testing device for the permeability coefficient of fractured media. Background Technology

[0002] The permeability characteristics of fractured media are core parameters for hydraulic engineering, mine safety, and geological disaster prevention. Traditional permeability testing equipment is mainly designed for homogeneous sand or intact rock, while fractured media exhibit significant anisotropy due to the presence of a non-uniformly distributed joint network. Existing equipment often requires complex 3D model reconstruction of fracture structures or relies on costly CT scans and numerical inversion. Physical experimental equipment is also typically large 3D tanks, making it difficult to achieve low-cost, rapid, in-situ assessment. Existing 2D seepage tank equipment for studying the spatial distribution of fractures in 2D seepage fields is often structurally complex and bulky.

[0003] To address the aforementioned shortcomings, there is an urgent need to develop a simple, low-cost two-dimensional testing device that can simultaneously achieve constant head control, automatic multi-point head monitoring, and simplified analysis of crack distribution, in order to meet the rapid diagnostic needs of engineering scenarios such as slope stability assessment and tailings dam seepage prevention detection. Utility Model Content

[0004] The purpose of this invention is to provide a simple testing device for the permeability coefficient of fractured media, so as to solve the problems raised in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a simple testing device for the permeability coefficient of fractured media, comprising:

[0006] A two-dimensional test chamber made of transparent material is used to contain fractured media and water flow. A water valve is installed at the bottom to collect outflow data.

[0007] An overflow water tank made of transparent material is located on the top side of the two-dimensional test box, and a constant water head opening slot is provided between the two to maintain a constant water head during the test. A water valve is provided at the bottom of the overflow water tank to control the water volume in the overflow water tank to be kept within the set constant water head, for collecting the top water head data of the two-dimensional test box.

[0008] The test pieces are distributed on both sides of the two-dimensional test chamber and are used to connect pressure sensors to collect pressure head data on both sides of the two-dimensional test chamber. The above data is recorded and combined with Darcy's law to calculate the permeability coefficient at different heights on both sides of the medium.

[0009] Furthermore, it also includes support components to provide support at the bottom of the two-dimensional test chamber and to reserve working space for the water outlet valve.

[0010] Furthermore, the two-dimensional test chamber has several pressure measurement holes distributed vertically at equal intervals on both sides; the test piece is located inside the pressure measurement holes and is used to measure the pressure head at different depths on both sides of the fractured medium, while avoiding medium overflow.

[0011] Furthermore, the test piece includes a rubber pipe, one end of which is sealed and embedded in the head pressure measuring hole and connected to the two-dimensional test box; the other end extends to the outside of the two-dimensional test box for connecting a pressure sensor.

[0012] Furthermore, a filter screen is attached to the inner wall of the two-dimensional test chamber at the corresponding water head pressure measuring hole, and the filter screen covers the rubber pipe port to isolate mud and sand inside the two-dimensional test chamber.

[0013] Furthermore, both water valve one and water valve two are made of brass.

[0014] Furthermore, the filter screen is a high-mesh sand-trapping screen.

[0015] Furthermore, the support member is a wooden bracket.

[0016] Furthermore, the transparent material is plexiglass.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] The testing equipment provided by this utility model includes a two-dimensional test chamber for containing fractured media and the inflow of water. A water valve is located at the bottom of the two-dimensional test chamber for collecting outflow data. It also includes an overflow tank located on one side of the top of the two-dimensional test chamber, test pieces distributed on both sides of the two-dimensional test chamber, and a support component for supporting the bottom of the two-dimensional test chamber. It records outflow data, top head data, and pressure head data on both sides, and calculates the permeability coefficient at different heights on both sides of the medium using Darcy's law. This invention uses a simple and low-cost two-dimensional testing device that can simultaneously achieve constant head control, automatic multi-point head monitoring, and simplified analysis of fracture distribution, meeting the rapid diagnostic needs of engineering scenarios such as slope stability assessment and tailings dam seepage prevention detection. Attached Figure Description

[0019] Figure 1 This is an isometric drawing of the present invention;

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 This is a bottom view of the present invention;

[0022] Figure 4 This is a top view of the present invention;

[0023] In the diagram: 1. Two-dimensional test chamber; 2. Overflow tank; 3. Constant head opening slot; 4. Water valve two; 5. Test piece; 6. Support piece; 7. Water valve one; 8. Water head pressure measuring hole; 9. Rubber pipe; 10. Filter screen. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] See Figures 1-4 .

[0026] This utility model provides a simple testing device for the permeability coefficient of fractured media, comprising:

[0027] The transparent two-dimensional test chamber 1 is used to contain the fractured medium and the water supply flow. It is equipped with a water valve 7 at the bottom, which is used to collect the outflow flow data. The water valve 7 can be connected to an external flow meter or recorded in real time by a measuring cylinder or stopwatch. It also includes a support 6, which is a wooden bracket used to support the bottom of the two-dimensional test chamber 1 and reserve the working space for the water valve 7. It can measure the undisturbed soil of the fractured medium in the laboratory or engineering site as needed. The undisturbed soil of the fractured medium is filled into the upper two-dimensional test chamber 1.

[0028] An overflow water tank 2 made of transparent material is located on the top side of the two-dimensional test box 1, and a constant head opening groove 3 is provided between the two to maintain a constant head during the test. A water valve 4 is provided at the bottom of the overflow water tank 2 to control the water volume of the overflow water tank 2 to be kept within the set constant head, and to collect the top water head data of the two-dimensional test box 1. The overflow water tank 2 is used to supply water to an external water supply system, and the constant head opening groove 3 between the overflow water tank 2 and the two-dimensional test box 1 maintains the position head during the test.

[0029] Test piece 5, distributed on both sides of the two-dimensional test chamber 1, is used to connect pressure sensors to collect pressure head data from both sides of the two-dimensional test chamber 1. Several pressure head measuring holes 8 are distributed vertically at equal intervals on both sides of the two-dimensional test chamber 1; the test piece 5 is located within the pressure head measuring holes 8, used to measure the pressure head at different depths on both sides of the fractured medium, while preventing medium overflow. The test piece 5 includes a rubber pipe 9, one end of which is sealed and embedded in the pressure head measuring hole 8 and connected to the two-dimensional test chamber 1; the other end extends to the outside of the two-dimensional test chamber 1 for connecting the pressure sensor. An external pressure sensor is inserted into the rubber pipe 9 to complete the connection. This invention uses a simple-to-operate and low-cost two-dimensional testing device, which can simultaneously achieve constant head control, automatic multi-point head monitoring, and simple analysis of fracture distribution, to meet the rapid diagnostic needs of engineering scenarios such as slope stability assessment and tailings dam seepage prevention detection.

[0030] Record the outflow rate data, top head data, and pressure head data on both sides, and combine them with Darcy's law to calculate the permeability coefficient at different heights on both sides of the medium in order to analyze the fracture distribution and record the outflow rate data.

[0031] During the test, a filter screen 10 is attached to the inner wall of the two-dimensional test chamber 1 at the corresponding water head pressure measuring hole 8. The filter screen 10 covers the port of the rubber pipe 9 to isolate the mud and sand inside the two-dimensional test chamber 1. The filter screen 10 is a high-mesh sand-blocking mesh to prevent mud and sand from overflowing into the pressure measuring hole during operation.

[0032] Both the transparent two-dimensional test chamber 1 and the overflow water tank 2 are made of plexiglass, allowing for clear observation of crack changes during the test.

[0033] Both water valve 7 and water valve 4 are made of brass.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0035] It should be noted that if the utility model embodiment involves directional indicators such as up and down, the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the figure. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, if the utility model embodiments involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. Furthermore, "multiple" refers to two or more.

[0037] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection of the utility model.

Claims

1. A simple testing device for the permeability coefficient of fractured media, characterized in that, include: A two-dimensional test chamber (1) made of transparent material is used to contain the fractured medium and the water supply flow. A water valve (7) is provided at the bottom of the chamber to collect the outflow data. An overflow tank (2) made of transparent material is located on the top side of the two-dimensional test box (1), and a constant head opening groove (3) is provided between the two to maintain a constant head during the test. A water valve (4) is provided at the bottom of the overflow tank (2) to control the water volume of the overflow tank (2) to be kept within the set constant head, and to collect the top head data of the two-dimensional test box (1). Test pieces (5) are distributed on both sides of the two-dimensional test box (1) and are used to connect pressure sensors to collect pressure head data on both sides of the two-dimensional test box (1); the above data are recorded and combined with Darcy's law to calculate the permeability coefficient at different heights on both sides of the medium.

2. The simplified testing device for permeability coefficient of fractured media according to claim 1, characterized in that, It also includes a support (6) to provide support at the bottom of the two-dimensional test box (1) and to reserve working space for the water outlet valve (7).

3. The simplified testing device for permeability coefficient of fractured media according to claim 2, characterized in that, The two-dimensional test box (1) has several pressure measurement holes (8) distributed vertically at equal intervals on both sides; the test piece (5) is located in the pressure measurement holes (8) and is used to measure the pressure head at different depths on both sides of the fractured medium, while avoiding the overflow of the medium.

4. The simplified testing device for permeability coefficient of fractured media according to claim 3, characterized in that, The test piece (5) includes a rubber pipe (9), one end of which is sealed and embedded in the head pressure measuring hole (8) and connected to the two-dimensional test box (1); the other end extends to the outside of the two-dimensional test box (1) for connecting a pressure sensor.

5. The simplified testing device for the permeability coefficient of fractured media according to any one of claims 3-4, characterized in that, A filter screen (10) is attached to the inner wall of the two-dimensional test box (1) at the corresponding water head pressure measuring hole (8). The filter screen (10) covers the port of the rubber pipe (9) and is used to isolate the mud and sand inside the two-dimensional test box (1).

6. The simplified testing device for permeability coefficient of fractured media according to claim 1, characterized in that, Both the first water valve (7) and the second water valve (4) are made of brass.

7. The simplified testing device for permeability coefficient of fractured media according to claim 5, characterized in that, The filter screen (10) is a high-mesh sand-trapping screen.

8. The simplified testing device for permeability coefficient of fractured media according to claim 2, characterized in that, The support (6) is a wooden bracket.

9. The simplified testing device for permeability coefficient of fractured media according to claim 1, characterized in that, The transparent material is plexiglass.

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