Modified chemical sounding treatment liquid for leakage entrance of earth-rock dam and application thereof

Abstract

The application discloses a modified chemical sound generation earth and rock dam leakage entrance acoustic tracing treatment liquid and application thereof, the tracing treatment liquid comprises a chemical sound generation treatment source, a sound generation delay agent, a water dispersion inhibitor and water, and the chemical sound generation treatment source comprises a weak acid reagent and a weak alkaline reagent. The tracing treatment liquid generates a powdery white precipitate after chemical reaction sound generation, the precipitate is inhaled into a leakage channel under the action of a near-field negative pressure of a leakage entrance, and with the massive accumulation of the precipitate, it is expected that the sealing treatment of the leakage channel can be further completed after the leakage entrance is traced; the tracing treatment liquid is naturally soluble with water, there is no floating and sinking problem in water, and the problem that the tracing treatment liquid migrates with water flow and freely crosses a sand and gravel material transition layer of an earth and rock dam is solved. In addition, the tracing treatment liquid has a certain viscosity, has a certain concentration maintaining capacity after being injected into water, a sound generation source can be kept in a small volume gathering state, and this is favorable for accurately tracing the position of a leakage entrance.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy project hidden danger detection technology, specifically involving a modified chemical sound-emitting acoustic tracer treatment liquid for seepage inlets of earth-rock dams and its application. Background Technology

[0002] Earth-rock dams, due to their advantages such as convenient construction and availability of local materials, are one of the most numerous dam types in water conservancy projects, and their safety is crucial for regional risk control. However, leakage remains the primary hidden danger affecting the safe operation of earth-rock dams; severe leakage can easily lead to dam failure, causing significant economic and social losses.

[0003] Currently, conventional geophysical methods for dam seepage detection, such as ground-penetrating radar, transient electromagnetic method, and high-density resistivity method, can only identify the water-rich area caused by seepage based on the electrical properties of the seepage dam body. However, they are difficult to find and locate the specific seepage point of the dam.

[0004] Sonar technology is widely used for precise positioning of underwater targets. However, the presence of a gravel-sand transition layer on both sides of the core wall of an earth-rock dam poses a challenge to directly detecting seepage inlets in the core wall using sonar. Sonar-based detection of seepage inlets in the core wall of an earth-rock dam typically requires drilling a hole at least 2 meters away from the core wall in the gravel-sand transition layer, placing the sonar inside the hole, and either actively generating sound waves or passively receiving the sound of water flow at the seepage inlet to determine its location. Due to the strong sound scattering effect in the gravel-sand transition layer, high-frequency sound waves are difficult to penetrate the gravel-sand material when the sonar actively emits them. Furthermore, the limitation of a borehole diameter of approximately 10 cm makes it difficult to create a sonar device that can both be placed inside the borehole and emit a low-frequency focused sound beam. This prevents the generation of low-frequency focused sound waves for seepage inlet detection. In engineering environments, the downstream gravel and sand area of ​​the core wall leakage channel is often accompanied by loud water flow noise with a frequency similar to that of the leakage inlet. The passive sonar method of directly receiving the water flow sound at the core wall leakage inlet and inverting the leakage inlet often faces the dilemma of inaccurate leakage inlet location. Summary of the Invention

[0005] Technical problem solved: To address the above-mentioned technical problems, this invention provides a modified chemically emitting acoustic tracer treatment liquid for seepage inlets of earth-rock dams and its application. It is applicable not only to the detection of seepage inlets in earth-rock dams without core walls, but also to the detection of seepage inlets in earth-rock dams with core walls. In particular, it can effectively solve the problem in the prior art that it is difficult to directly detect the seepage inlet of the core wall in a borehole with a diameter of about 10 cm in the gravel and sand area on the upstream side of the dam, which is no more than 5 m away from the seepage inlet of the core wall, based on sonar.

[0006] Technical solution: In a first aspect, the present invention provides a modified chemically emitting acoustic tracer treatment liquid for seepage inlets of earth-rock dams, comprising a chemically emitting treatment source, a sound-emitting delay agent, a water-dispersible inhibitor, and water, wherein the chemically emitting treatment source comprises a weakly acidic reagent and a weakly alkaline reagent.

[0007] Preferably, the weakly acidic reagent is oxalic acid dihydrate powder (analytical grade), 2,6-dihydroxyisonicotinic acid powder (analytical grade), or DL-hydroxysuccinic acid powder (analytical grade); the weakly alkaline reagent is anhydrous potassium carbonate (analytical grade); the sound-delaying agent is potassium aluminum sulfate dodecahydrate powder (analytical grade); and the water-dispersing inhibitor is xanthan gum powder or sodium alginate powder (analytical grade), with a viscosity ≥ 0.01 Pa·s.

[0008] Preferably, the proportions of each component in the tracer treatment solution are as follows: per 100 mL of water, the weak acid reagent is 50-80 g, the weak alkaline reagent is 25-40 g, the sound delay agent is 20-32 g, and the water dispersion inhibitor is 1-3 g.

[0009] Preferably, the chemical acoustic frequency band of the tracer treatment solution is 500~3000Hz, and the peak sound frequency band is 700~1500Hz; after the tracer treatment solution produces sound through chemical reaction, it generates a powdery white precipitate.

[0010] Secondly, the present invention provides the application of the tracer treatment fluid described in the first aspect in detecting seepage inlets of earth-rock dams, particularly in detecting seepage inlets of core-wall earth-rock dams.

[0011] Preferably, the application includes the following steps: S1. Mix the weak acid reagent, the sound delay agent, the water-dispersible inhibitor and water in a certain proportion, stir evenly to obtain a mixed solution; S2. The mixed solution obtained in step S1 and the weakly alkaline reagent are respectively sent to the predetermined tracer treatment solution delivery point. S3. 20 seconds before adding the tracer solution, add the weak alkaline reagent to the mixed solution and stir for no more than 20 seconds. S4. After preparation, the tracer treatment solution is added to the flowing water around the seepage inlet of the earth-rock dam. When the earth-rock dam is a core-wall earth-rock dam, the tracer treatment solution is added to the flowing water around the seepage channel by drilling holes in the gravel and stone material on the upstream side of the core wall. When the earth-rock dam is a coreless earth-rock dam, the tracer treatment solution is directly added to the flowing water around the upstream side of the seepage channel. S5. Driven by the negative pressure suction at the leakage inlet, the tracer treatment fluid migrates towards the leakage inlet in the core wall. During the migration, the tracer treatment fluid emits an acoustic signal that is different from the frequency band of the ambient noise to mark its own position in real time until the tracer treatment fluid flows into the leakage channel. The location of the leakage inlet is identified based on the abrupt change in the acoustic signal when the tracer treatment fluid flows into the leakage inlet.

[0012] Furthermore, in step S1, the stirring speed is 400-600 rpm and the stirring time is 3-5 min.

[0013] Furthermore, in step S3, the stirring speed is 40–60 rpm.

[0014] Furthermore, in step S4, for a core-wall earth-rock dam, when the horizontal distance between the placement point in the borehole and the core wall is 2m, the placement depth is 0.2~0.4m each time. 3 Tracer treatment fluid; when the horizontal distance between the injection point in the borehole and the core wall is 3m, inject 0.5~0.7m each time. 3 Tracer treatment fluid; when the horizontal distance between the injection point in the borehole and the core wall is 4m, inject 0.8~1.0m each time. 3 Tracer treatment fluid; for coreless earth-rock dams, when the horizontal distance of the application point from the dam surface is 2m, the application depth is 0.2~0.4m each time. 3 Tracer treatment solution; when the horizontal distance between the application point and the dam surface is 3m, apply 0.5~0.7m at a time. 3 Tracer treatment solution; when the horizontal distance between the application point and the dam surface is 4m, apply 0.8~1.0m each time. 3 Tracer treatment solution.

[0015] Beneficial effects: (1) This invention creatively proposes three functional elements: chemical sound source, sound delay agent and water dispersion inhibitor. By mixing the three functional elements with water, an acoustic tracer treatment liquid is prepared. The tracer treatment liquid continuously reacts chemically and emits sound for more than 10 minutes. The peak frequency band of the sound is 700~1500Hz, which is different from the water flow sound and other underwater environmental noise. This solves the problem of long-term sound tracing of the marked sound source in a specific frequency band underwater. (2) After the tracer treatment liquid produces a powdery white precipitate after the chemical reaction, the precipitate is drawn into the leakage channel under the near-field negative pressure of the leakage inlet. With the accumulation of a large amount of precipitate, it is expected to further complete the sealing treatment of the leakage channel after tracing the leakage inlet. (3) The materials required for the tracer treatment solution are economical and environmentally friendly, and suitable for large-scale use on engineering sites. The prepared tracer treatment solution is naturally miscible with water and does not have the problem of floating or sinking in water, thus solving the problem of the tracer treatment solution migrating with the water flow and freely passing through the sand and gravel transition layer of the earth-rock dam. In addition, the tracer treatment solution has a certain viscosity and has a certain concentration retention capacity after being injected into the water body. The sound source can maintain a small volume of convergence, which is conducive to accurately tracing the location of the leakage inlet. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the typical chemical reaction sound generation process of the tracer treatment solution of the present invention, wherein (a) is before the addition of potassium carbonate, (b) is 15s after the addition of potassium carbonate, and (c) is 600s after the addition of potassium carbonate. Figure 2 These are acoustic curves (frequency domain analysis) collected by a hydrophone before and after the addition of the tracer treatment solution of this invention; Figure 3 It is a powdery white precipitate generated after the tracer treatment solution of the present invention undergoes a chemical reaction. Detailed Implementation

[0017] The present invention will be described in detail below with reference to specific embodiments: all chemical reagents used in the following embodiments are of analytical grade. Example 1

[0018] Mix 70g of 2,6-dihydroxyisonicotinic acid (citric acid monohydrate) powder, 28g of potassium aluminum sulfate dodecahydrate (alum), 35g of anhydrous potassium carbonate, 1g of xanthan gum powder, and 100mL of water, and stir until homogeneous. The typical chemical reaction and sound-producing process is shown below. Figure 1 . Figure 1 (a) is a mixed solution of citric acid powder monohydrate, alum, xanthan gum powder and water before the addition of potassium carbonate; Figure 1 (b) shows the situation where potassium carbonate is added to the mixed solution and stirred immediately for 5 seconds. Then, at 10 seconds, the acid-base neutralization reaction produces bubbles and makes a sound. Figure 1 Image (c) shows the continuous generation of bubbles and sound at 600 seconds after potassium carbonate is added to the mixed solution and stirring is completed. The powdery white precipitate formed after the tracer solution undergoes the chemical reaction and produces sound is as follows: Figure 3 As shown. Example 2

[0019] The tracer treatment solution is prepared by mixing 50g of oxalic acid dihydrate powder, 25g of anhydrous potassium carbonate, 20g of alum, 1g of sodium alginate powder with 100mL of water. Example 3

[0020] A tracer treatment solution was prepared by mixing 60g of citric acid monohydrate powder, 30g of anhydrous potassium carbonate, 24g of alum, 1.5g of xanthan gum powder with 100mL of water. Example 4

[0021] A tracer treatment solution was prepared by mixing 70g of DL-hydroxysuccinic acid (DL-malic acid) powder, 35g of anhydrous potassium carbonate, 28g of alum, and 2g of sodium alginate powder with 100mL of water. Example 5

[0022] The tracer treatment solution was prepared by mixing 80g of oxalic acid powder, 40g of anhydrous potassium carbonate, 32g of alum, 3g of xanthan gum powder with 100mL of water. Example 6

[0023] 70g of citric acid monohydrate powder, 28g of alum, 35g of anhydrous potassium carbonate, and 1g of xanthan gum powder were mixed with 100mL of water and stirred. The sound emission patterns of the tracer solution were then collected using a hydrophone. The oscilloscope used in the experiment was a Keysight Technologies DSOX4024A digital storage oscilloscope. This device features a 200 MHz analog bandwidth, a 5 GSa / s real-time sampling rate, 4 channels, and a standard 4 Mpts deep storage depth, enabling accurate capture and measurement of high-frequency and fast transient signals. An RHSA-20 standard hydrophone was used. This hydrophone operates in the frequency range of 20 Hz to 100 kHz, with a linear frequency range of 20 Hz to 50 kHz, a low-frequency receiving sensitivity of -198 dB, and horizontal and vertical directivity within ±1.5 dB and ±2.0 dB, respectively (measured at 100 kHz). The hydrophone was suspended in the solution to collect the sound emission patterns of the tracer treatment solution. The intensity of the collected sound signal primarily originated from the sound emitted when gas was produced during the internal reaction of the tracer treatment solution. The test results for the sound frequency band of the chemical reaction are shown below. Figure 2 The blue curve represents the amplitude-frequency response (ARF) of the ambient sound before the addition of potassium carbonate; the orange curve represents the ARF of the sound emitted during the chemical reaction of the tracer solution 15 seconds after the addition of potassium carbonate. Comparing the two curves, it can be observed that in the 500–3000 Hz range, the amplitude of the orange curve is significantly higher than that of the blue curve, with the peak of the increase concentrated in the 700–1500 Hz frequency range. Therefore, the sound emission frequency range of the tracer solution is 500–3000 Hz, and the peak sound frequency is concentrated in the 700–1500 Hz frequency range. Example 7

[0024] The tracer treatment solution prepared in Example 6 was used to detect the location of seepage inlets in earth-rock dams, especially in the detection of seepage inlets in core earth-rock dams. The specific steps are as follows: S1. Mix the weak acid reagent, sound delay agent, water-dispersible inhibitor and water in proportion, stir evenly to obtain a mixed solution, stir at 400-600 rpm for 3-5 minutes.

[0025] S2. The mixed solution obtained in step S1 and the weakly alkaline reagent are respectively sent to the predetermined tracer treatment solution delivery point.

[0026] S3. 20 seconds before adding the tracer solution, add the weak alkaline reagent to the mixed solution and stir. The stirring speed is 40-60 rpm and the stirring time does not exceed 20 seconds.

[0027] S4. After preparation, add the tracer treatment solution to the flowing water surrounding the seepage inlet of the earth-rock dam. When the earth-rock dam is a core-wall earth-rock dam, drill a hole in the gravel and sand on the upstream side of the core wall and add the tracer treatment solution to the flowing water surrounding the seepage channel. When the earth-rock dam is a coreless earth-rock dam, directly add the tracer treatment solution to the flowing water surrounding the upstream side of the seepage channel. For core-wall earth-rock dams, when the horizontal distance between the injection point in the borehole and the core wall is 2m, add 0.2~0.4m each time. 3 Tracer treatment fluid; when the horizontal distance between the injection point in the borehole and the core wall is 3m, inject 0.5~0.7m each time. 3 Tracer treatment fluid; when the horizontal distance between the injection point in the borehole and the core wall is 4m, inject 0.8~1.0m each time. 3 Tracer treatment fluid; for coreless earth-rock dams, when the horizontal distance of the application point from the dam surface is 2m, the application depth is 0.2~0.4m each time. 3 Tracer treatment solution; when the horizontal distance between the application point and the dam surface is 3m, apply 0.5~0.7m at a time. 3 Tracer treatment solution; when the horizontal distance between the application point and the dam surface is 4m, apply 0.8~1.0m each time. 3 Tracer treatment solution.

[0028] S5. Driven by the negative pressure suction at the leakage inlet, the tracer treatment fluid migrates towards the leakage inlet in the core wall. During the migration, the tracer treatment fluid emits an acoustic signal that is different from the frequency band of the ambient noise to mark its own position in real time until the tracer treatment fluid flows into the leakage channel. The location of the leakage inlet is identified based on the abrupt change in the acoustic signal when the tracer treatment fluid flows into the leakage inlet.

[0029] In engineering environments, the downstream gravel and sand areas of the core wall leakage channel are often accompanied by significant water flow noise with frequencies similar to the leakage inlet. The passive sonar method of directly receiving the acoustic signal from the core wall leakage inlet and retrieving the inlet is often interfered with by widespread water flow noise sources downstream of the leakage channel, resulting in poor accuracy in locating the leakage inlet. However, the tracer treatment liquid of this invention has a certain viscosity and, after being injected into the water body, maintains a certain concentration. The sound source can remain in a small, concentrated state and continuously emit specific frequency sounds distinct from environmental noise such as water flow. This facilitates accurate tracing of the leakage inlet location, making the detected leakage inlet location more accurate than that of sonar methods.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modified chemically emitting acoustic tracer treatment solution for seepage inlets of earth-rock dams, characterized in that: The device includes a chemical sound-generating source, a sound-delaying agent, an in-water dispersion inhibitor, and water. The chemical sound-generating source includes a weakly acidic reagent and a weakly alkaline reagent. The weakly acidic reagent is oxalic acid dihydrate powder, 2,6-dihydroxyisonicotinic acid powder, or DL-hydroxysuccinic acid powder. The weakly alkaline reagent is anhydrous potassium carbonate. The sound-delaying agent is potassium aluminum sulfate dodecahydrate powder. The in-water dispersion inhibitor is xanthan gum powder or sodium alginate powder, and the viscosity is ≥0.01 Pa·s.

2. The modified chemically emitting acoustic tracer treatment solution for seepage inlets of earth-rock dams according to claim 1, characterized in that, The proportions of each component in the tracer treatment solution are as follows: per 100 mL of water, the weak acid reagent is 50-80 g, the weak alkaline reagent is 25-40 g, the sound delay agent is 20-32 g, and the water dispersion inhibitor is 1-3 g.

3. The modified chemically emitting acoustic tracer treatment solution for seepage inlets of earth-rock dams according to claim 1, characterized in that: The tracer treatment solution has a chemical acoustic frequency band of 500~3000Hz and a sound peak frequency band of 700~1500Hz; after the tracer treatment solution produces sound through chemical reaction, it generates a powdery white precipitate.

4. The application of the tracer treatment fluid according to any one of claims 1-3 in detecting seepage inlets of earth-rock dams.

5. The application according to claim 4, characterized in that, Includes the following steps: S1. Mix the weak acid reagent, the sound delay agent, the water-dispersible inhibitor and water in a certain proportion, stir evenly to obtain a mixed solution; S2. The mixed solution obtained in step S1 and the weakly alkaline reagent are respectively sent to the predetermined tracer treatment solution delivery point. S3. 20 seconds before adding the tracer solution, add the weak alkaline reagent to the mixed solution and stir for no more than 20 seconds. S4. After preparation, the tracer treatment solution is added to the flowing water around the seepage inlet of the earth-rock dam. When the earth-rock dam is a core-wall earth-rock dam, the tracer treatment solution is added to the flowing water around the seepage channel by drilling holes in the gravel and stone material on the upstream side of the core wall. When the earth-rock dam is a coreless earth-rock dam, the tracer treatment solution is directly added to the flowing water around the upstream side of the seepage channel. S5. Driven by the negative pressure suction at the leakage inlet, the tracer treatment fluid migrates towards the leakage inlet in the core wall. During the migration, the tracer treatment fluid emits an acoustic signal that is different from the frequency band of the ambient noise to mark its own position in real time until the tracer treatment fluid flows into the leakage channel. The location of the leakage inlet is identified based on the abrupt change in the acoustic signal when the tracer treatment fluid flows into the leakage inlet.

6. The application according to claim 5, characterized in that, In step S1, the stirring speed is 400-600 rpm and the stirring time is 3-5 min.

7. The application according to claim 5, characterized in that, In step S3, the stirring speed is 40-60 rpm.

8. The application according to claim 5, characterized in that, In step S4, for a core-wall earth-rock dam, when the horizontal distance between the placement point in the borehole and the core wall is 2m, the placement depth is 0.2~0.4m each time. 3 Tracer treatment fluid; when the horizontal distance between the injection point in the borehole and the core wall is 3m, inject 0.5~0.7m each time. 3 Tracer treatment fluid; when the horizontal distance between the injection point in the borehole and the core wall is 4m, inject 0.8~1.0m each time. 3 Tracer treatment fluid; for coreless earth-rock dams, when the horizontal distance of the application point from the dam surface is 2m, the application depth is 0.2~0.4m each time. 3 Tracer treatment solution; when the horizontal distance between the application point and the dam surface is 3m, apply 0.5~0.7m at a time. 3 Tracer treatment solution; when the horizontal distance between the application point and the dam surface is 4m, apply 0.8~1.0m each time. 3 Tracer treatment solution.

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