A single ring water injection permeability test device for earth and rockfill dam site

Abstract

The utility model relates to the field of geotechnical test technology, and disclose a kind of single ring water injection permeation test device for earth and rockfill dam site, comprising: single ring main body, the single ring main body is installed at the sample plane of evenness;Water tank, the water tank is installed on single ring main body;Water level control system, the water level control system includes the controller installed on the side wall of water tank, electromagnetic regulating valve installed at the bottom of water tank, and water level sensor is set in single ring main body and flush with sample plane;The utility model can make that single ring main body periphery and dam body contact surface tightness, effectively prevent the side water leakage phenomenon in test process, improve test precision, water level can be accurately controlled simultaneously, solve the problem of large water injection of high permeability coefficient soil body, water level control difficulty, not only can improve test quality and efficiency, guarantee test success rate and accuracy, but also can reduce artificial intervention, realize constant water level condition, reduce labor intensity and improve efficiency.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical testing technology, and in particular to a single-ring water injection permeability test device. Background Technology

[0002] After the construction of an earth-rock dam is completed, a single-ring water injection permeability test is typically used to determine the permeability coefficient in order to verify the permeability performance of the dam's building materials. However, existing single-ring water injection tests have the following problems: poor sealing at the contact surface between the ring and the dam body, leading to easy side leakage during the test and resulting in significant deviations in the results; and the use of clay to seal the circumference of the single ring can easily cause clay contamination of the test surface; large water injection volumes are required when the permeability coefficient is high, making it difficult to accurately control the water level, resulting in inaccurate water volume records and affecting the accuracy of permeability coefficient calculations; frequent manual adjustment of the water level is necessary, which is labor-intensive and prone to errors during operation. Utility Model Content

[0003] This invention proposes a single-ring water injection seepage test device for use in earth-rock dam sites, in order to solve the problems of water leakage from the single-ring sidewall, large errors in manual testing, and high labor intensity in existing testing processes.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a single-ring water injection seepage test device for earth-rock dam sites, comprising: A single-ring body is installed on a flat sample plane; Water tank, which is installed on the single-ring body; A water level control system includes a controller installed on the side wall of a water tank, an electromagnetic regulating valve installed at the bottom of the water tank, and a water level sensor installed inside a single-ring body and flush with the sample plane. The electromagnetic regulating valve and the water level sensor are both electrically connected to the controller.

[0005] Preferably, the water tank is also equipped with a flow monitoring component, which includes a water level scale installed on the outer wall of the water tank, enabling real-time monitoring of the water level inside the water tank.

[0006] Preferably, the bottom edge of the single-ring body is beveled to form a single-ring cut corner, which facilitates the installation of the single-ring body.

[0007] Preferably, an annular sealing gasket fixing groove is provided on the bottom inner wall of the single ring body, and a removable water-swellable sealing gasket is pre-placed inside the sealing gasket fixing groove to ensure the sealing of the bottom of the single ring body and ensure the accuracy of the single ring water injection penetration test.

[0008] This application has the following advantages: This utility model has strong applicability, which can ensure the sealing of the contact surface between the single ring body and the dam body, effectively preventing side leakage during the test, avoiding deviation in test results, improving test accuracy, and accurately controlling the water level. While solving the problems of large water injection volume and difficult water level control in high permeability soil, it can improve test quality and efficiency, ensure test success rate and accuracy, and reduce manual intervention, achieve constant water level conditions, reduce labor intensity and improve efficiency. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Cross-sectional view of section A in the middle; In the diagram: 1. Water tank; 2. Controller; 3. Electromagnetic regulating valve; 4. Water level sensor; 5. Water-swellable sealing gasket; 6. Single ring main body; 7. Water level scale; 8. Single ring cutting corner; 9. Sealing gasket fixing groove. Detailed Implementation

[0011] 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.

[0012] like Figure 1 and Figure 2 As shown, a single-ring water injection seepage test device for on-site earth-rock dam testing includes: The single ring body 6 is installed on a flat sample plane; the single ring body 6 is a ring made of metal or high-strength plastic; the bottom edge of the single ring body 6 is beveled to form a single ring soil cutting angle 8; the bottom inner wall of the single ring body 6 is also provided with an annular sealing gasket fixing groove 9, and a removable water-swellable sealing gasket 5 is pre-placed inside the sealing gasket fixing groove 9. Water tank 1 is installed on the single ring body 6; water tank 1 is made of circular transparent fiberglass material; water tank 1 is also equipped with a flow monitoring component, which includes a water level scale 7 installed on the outer wall of water tank 1. The water level control system includes a controller 2 installed on the side wall of the water tank 1, an electromagnetic regulating valve 3 installed at the bottom of the water tank 1, and a water level sensor 4 installed inside the single-ring body 6 and flush with the sample plane. The electromagnetic regulating valve 3 and the water level sensor 4 are both electrically connected to the controller 2.

[0013] Among them, the water level sensor 4 is a pressure water level sensor, which senses the water level in the single-ring body 6 and feeds back the obtained water level value to the controller 2. Then, the controller 2 controls the opening and closing of the electromagnetic regulating valve 3 according to the water level value, as follows: When the pressure level sensor detects that the water level has reached the set upper limit, the controller 2 controls the electromagnetic regulating valve 3 to automatically close; when the pressure level sensor detects that the water level is lower than the set lower limit, the controller 2 controls the electromagnetic regulating valve 3 to automatically open, thereby maintaining a constant water level. The pressure level sensor system can automatically control the opening and closing of the electromagnetic regulating valve 3 by monitoring changes in water depth, realizing the intelligent water filling function of the water tank 1. This system is based on the principle of fluid statics: the pressure increases linearly as the water depth increases. The sensor converts the pressure signal into an electrical signal, and the controller drives the valve to act according to the preset water level threshold.

[0014] Specifically, the method for determining the permeability coefficient of dam filling material on-site using the seepage testing device provided by this utility model includes the following steps: (1) Smooth the compacted fill material surface and dig a test pit 10-15cm deep with an outer diameter of about the diameter of a single ring at the smooth surface; (2) Fill the water-swellable sealing gasket 5 into the sealing gasket fixing groove 9, bury the single ring body 6 in the flat and compacted test pit, confirm that the water-swellable sealing gasket 5 at the bottom edge of the single ring body 6 is in close contact with the bottom of the test pit, and that the single ring body 6 and the perimeter of the test pit are sealed with fine soil. (3) Connect the water supply tank 1, and then start injecting water into the single ring body 6. After water is injected, the sealing gasket 5 expands rapidly when it comes into contact with water, forming an effective sealing layer. (4) The amount of water entering the single-ring body 6 is accurately recorded by reading the value of the water level scale 7 on the water tank 1, and the intelligent water addition function is realized through the water level control system set inside the single-ring body 6 to maintain constant water level conditions. (5) Read the value of the water level scale 7 on the water tank 1 at the required interval. When the difference between the two readings meets the requirements for ending the test, stop the test. The flow rate at the last time interval is the seepage flow rate, and draw the time-flow curve on site.

[0015] The formula for calculating the permeability coefficient of the fill material test layer is as follows:

[0016] Where: k——permeability coefficient of the test soil layer (cm / s); Q—Infiltration flow rate at the last interval (cm3); A – Area of ​​a single ring (cm2); t — the last time interval (s).

[0017] In summary, this utility model achieves the functions of sealing the sidewall of the single-ring main body 6, precise water injection control, and automatic water level adjustment by setting a water-swellable sealing gasket 5 at the bottom of the single-ring main body 6, and jointly controlling the water tank 1 and the water level control system. This solves the problems of water leakage on the sidewall of the single ring, large errors in manual testing, and high labor intensity during the test. As a result, it can not only improve the quality and efficiency of the test and ensure the success rate and accuracy of the test, but also reduce manual intervention, achieve constant water level conditions, reduce labor intensity and improve efficiency.

[0018] 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.

Claims

1. A single-ring water injection seepage test device for use in earth-rock dam sites, characterized in that, include: A single-ring body (6) is installed on a flat sample plane; Water tank (1), the water tank (1) is installed on the single ring body (6); The water level control system includes a controller (2) installed on the side wall of the water tank (1), an electromagnetic regulating valve (3) installed at the bottom of the water tank (1), and a water level sensor (4) set in the single ring body (6) and flush with the sample plane. The electromagnetic regulating valve (3) and the water level sensor (4) are both electrically connected to the controller (2).

2. The single-ring water injection seepage test device for earth-rock dam site testing according to claim 1, characterized in that: The water tank (1) is also equipped with a flow monitoring component, which includes a water level scale (7) installed on the outer wall of the water tank (1).

3. The single-ring water injection seepage test device for earth-rock dam site testing according to claim 1, characterized in that: The bottom edge of the single ring body (6) is obliquely cut to form a single ring soil cutting angle (8).

4. The single-ring water injection seepage test device for earth-rock dam site testing according to claim 1, characterized in that: The bottom inner wall of the single ring body (6) is also provided with an annular sealing gasket fixing groove (9), and a removable water-swellable sealing gasket (5) is pre-installed inside the sealing gasket fixing groove (9).

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