An acoustic-visualization coupled coal mine drilling sealing grouting diffusion monitoring device and method

Abstract

The application discloses a coal mine drilling sealing and grouting diffusion monitoring device and method based on sound wave-visualization coupling, and relates to the technical field of coal mine drilling grouting sealing and gas extraction monitoring. The device comprises a fissure coal body simulation module, a transparent simulation drilling hole, a grouting system, a sound wave monitoring system, a visualization observation system and a data acquisition system. During the grouting process, a high-speed camera records the diffusion and filling process of the slurry in the fissure in real time, a sound wave emission probe and a receiving probe synchronously monitor the sound wave propagation speed and the change of the attenuation characteristics, and a pressure sensor collects the grouting pressure. The data acquisition system synchronously collects and comprehensively analyzes the sound wave, pressure and image data, realizes the coupling monitoring of the slurry diffusion process and the fissure filling state, and provides an experimental basis for the drilling sealing and grouting diffusion law research and the sealing effect evaluation.

Description

Technical Field

[0001] This invention relates to a sound wave-visual coupling borehole grouting diffusion monitoring device and method, belonging to the field of coal mine borehole grouting sealing and gas extraction monitoring technology. Background Technology

[0002] In the process of grouting and sealing in coal mine boreholes, the diffusion and filling of grout in coal seam fissures directly affect the borehole sealing effect and gas extraction efficiency. However, the structure of coal seam fissures is complex, and the grout migration process is difficult to observe intuitively. Existing monitoring methods mostly rely on experience-based judgment or single-parameter monitoring, lacking visualization and real-time monitoring of fissure filling status. Therefore, developing a device that can visualize the grout diffusion process and combine it with acoustic monitoring of fissure filling status is of great significance for studying the diffusion law of borehole grouting and improving the sealing effect. Summary of the Invention

[0003] To address the challenges of visually observing the grout diffusion process within coal seam fractures and the lack of effective monitoring of fracture filling status in existing borehole grouting studies, this invention provides an acoustic-visualization coupled borehole grouting diffusion monitoring device. This device enables visual observation of the grout diffusion process and, combined with acoustic monitoring technology, identifies the fracture filling status, thereby improving the ability to study the diffusion patterns and sealing effects of borehole grouting. This invention also proposes an acoustic-visualization coupled borehole grouting diffusion monitoring method.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In the first technical solution, a sound wave-visualization coupled borehole grouting diffusion monitoring device includes a fractured coal body simulation module, a transparent simulated borehole, a grouting pipe, a return grout pipe, a grout storage tank, a grouting pump, a sound wave emitting probe, a sound wave receiving probe, a sound wave signal processor, a visualization observation window, a high-speed camera, an LED light source, a pressure sensor, and a data acquisition system. The transparent simulated borehole is located inside the fractured coal body simulation module. The grouting pipe and the return grout pipe are arranged parallel to each other inside the transparent simulated borehole. One end of the grouting pipe is connected to the grout storage tank and the grouting pump for injecting grout into the borehole. The return grout pipe is used to recover excess grout and regulate the grout flow state. A visualization observation window is set on the outside of the fractured coal body simulation module. A high-speed camera and an LED light source are installed outside the visualization observation window to record the diffusion process of grout in the fractures. The sound wave emitting probe and the sound wave receiving probe are symmetrically arranged on both sides of the fractured coal body simulation module and connected to the data acquisition system through the sound wave signal processor to monitor changes in sound wave propagation characteristics during grout filling. A pressure sensor is installed on the grouting pipe to monitor changes in grouting pressure in real time.

[0005] In the first technical solution, as a preferred embodiment, the fractured coal body simulation module consists of a transparent side plate, a coal body simulation block, and an adjustable fracture plate. By adjusting the spacing between the adjustable fracture plates, fracture structures of different widths and different degrees of development can be simulated.

[0006] In the first technical solution, the transparent simulated borehole consists of a transparent plexiglass tube and a sealing joint, used to simulate the structure of a coal mine borehole and to visualize the process of slurry transport inside the borehole.

[0007] In the first technical solution, as a preferred embodiment, the acoustic wave transmitting probe and the acoustic wave receiving probe are symmetrically arranged on both sides of the fractured coal body simulation module to monitor the changes in acoustic wave propagation speed and attenuation characteristics during the diffusion and filling of slurry in the fractured coal body.

[0008] In the first technical solution, preferably, the data acquisition system is connected to an acoustic signal processor, a pressure sensor, and a high-speed camera to synchronously acquire acoustic propagation parameters, grouting pressure, and visual image data, and to store and analyze the acquired data.

[0009] In the second technical solution, a method for monitoring borehole grouting diffusion using acoustic-visual coupling, employing an acoustic-visual coupling borehole grouting diffusion monitoring device as described in the first technical solution, includes the following steps: Step 1: Construct a fractured coal body simulation module, set up a transparent simulated borehole inside it, adjust the fracture structure according to experimental requirements, and install the grouting pipe and return grout pipe at designated positions inside the transparent simulated borehole. Step 2: Install the acoustic wave transmitting probe and acoustic wave receiving probe on both sides of the fractured coal body simulation module, and connect them to the acoustic wave signal processor and data acquisition system; Step 3: Prepare and deliver grouting material through a storage tank and grouting pump, inject it into the transparent simulated borehole through the grouting pipe, allowing the grout to diffuse into the fractured coal body, and recover excess grout through the return pipe; Step 4: Use a high-speed camera to record the diffusion and filling process of grout in the cracks through a visual observation window. At the same time, monitor the changes in sound wave propagation characteristics through a sound wave emitting probe and a sound wave receiving probe, and record the changes in grouting pressure through a pressure sensor. Step 5: The acoustic signal, pressure data and visualization images are comprehensively analyzed through the data acquisition system to obtain the slurry diffusion law and the crack filling state.

[0010] Compared with the prior art, the beneficial effects of the present invention are: This invention combines visualization observation technology with acoustic monitoring technology to achieve dynamic visualization observation of the grout diffusion process and can identify the fracture filling state through changes in acoustic wave propagation characteristics. At the same time, it uses a data acquisition system to comprehensively analyze acoustic wave parameters, pressure changes, and image information, thereby improving the monitoring capability of the borehole grouting diffusion process and providing a reliable experimental means for studying the coal body fracture filling mechanism and evaluating the borehole sealing effect. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of a borehole grouting diffusion monitoring device with acoustic-visual coupling according to the present invention. Figure 2 This is a schematic diagram of the structure of the fractured coal body simulation module of the present invention; Figure 3 This is a schematic diagram of the transparent simulated drilling and pipeline layout structure of the present invention; Figure 4 This is a schematic diagram of the acoustic wave monitoring system of the present invention; Figure 5 This is a schematic diagram of the grouting system of the present invention.

[0012] In the diagram: 1. Fractured coal seam simulation module; 2. Transparent simulated borehole; 3. Grouting pipe; 4. Return grout pipe; 5. Grout storage tank; 6. Grouting pump; 7-1. Acoustic wave transmitting probe; 7-2. Acoustic wave receiving probe; 8. Acoustic wave signal processor; 9. Visual observation window; 10. High-speed camera; 11. LED light source; 12. Pressure sensor; 13. Data acquisition system. Detailed Implementation

[0013] The present invention is illustrated below with specific examples. These descriptions are merely exemplary and are not intended to limit the present invention.

[0014] Example 1 like Figures 1-5 As shown in this embodiment, a sound wave-visualization coupled borehole grouting diffusion monitoring device includes a fractured coal body simulation module 1, a transparent simulated borehole 2, a grouting pipe 3, a return grout pipe 4, a grout storage tank 5, a grouting pump 6, a sound wave emitting probe 7-1, a sound wave receiving probe 7-2, a sound wave signal processor 8, a visual observation window 9, a high-speed camera 10, an LED light source 11, a pressure sensor 12, and a data acquisition system 13. The transparent simulated borehole 2 is located inside the fractured coal body simulation module 1. The grouting pipe 3 and the return grout pipe 4 are arranged parallel to each other inside the transparent simulated borehole 2. One end of the grouting pipe 3 is connected to the grout storage tank 5 and the grout is pumped by the grouting pump 6. The return grout pipe 4 is used to recover excess grout and regulate the grout flow state.

[0015] Acoustic wave transmitting probe 7-1 and acoustic wave receiving probe 7-2 are symmetrically arranged on both sides of the fractured coal body simulation module 1 and connected to the acoustic wave signal processor 8. They are used to transmit and receive acoustic wave signals to monitor the changes in acoustic wave propagation characteristics during slurry diffusion and fracture filling. A visualization observation window 9 is set on the side of the fractured coal body simulation module 1. A high-speed camera 10 and an LED light source 11 are installed outside the visualization observation window 9 to record the diffusion process of slurry in the fracture in real time. A pressure sensor 12 is installed on the grouting pipe 3 to monitor the changes in grouting pressure in real time. All monitoring signals are transmitted to the data acquisition system 13 for recording and analysis.

[0016] Specifically, a sound wave-visualization coupled borehole grouting diffusion monitoring device includes a fractured coal body simulation module 1, a transparent simulated borehole 2, a grouting pipe 3, and a return grout pipe 4. Its key features include a sound wave emitting probe 7-1, a sound wave receiving probe 7-2, a sound wave signal processor 8, a high-speed camera 10, and a data acquisition system 13. The sound wave emitting probe 7-1 and the sound wave receiving probe 7-2 are respectively installed on both sides of the fractured coal body simulation module 1 to emit and receive sound wave signals. By monitoring changes in the sound wave propagation speed and attenuation characteristics, the device reflects the filling state of the fractures by the grout. The signals are then transmitted to the sound wave signal processor 8 for processing and subsequently to the data acquisition system 13 for recording.

[0017] The grout storage tank 5 is used to store grouting materials. The grout is transported to the grouting pipe 3 by the grouting pump 6. After entering the transparent simulated borehole 2, the grout diffuses into the fracture structure in the fractured coal body simulation module 1. The return grout pipe 4 is used to recover excess grout to ensure the internal pressure of the grouting system is stable.

[0018] The high-speed camera 10 captures the slurry diffusion process inside the fractured coal body in real time through the visualization observation window 9, and the LED light source 11 is used to provide stable lighting conditions, thereby improving the visualization observation effect of the slurry diffusion process.

[0019] Pressure sensor 12 is used to monitor the grouting pressure changes in the grouting pipe 3 in real time and transmit the pressure data to the data acquisition system 13 to achieve dynamic monitoring of the grouting process. Through the coordinated work of the acoustic monitoring system, the visualization observation system, and the grouting system, dynamic visualization observation of the grout diffusion process can be achieved, and the fracture filling state can be identified by changes in acoustic propagation characteristics, thereby providing experimental basis for studying the diffusion law of grout in coal fractures.

[0020] The fractured coal body simulation module 1 is equipped with an adjustable fracture structure. By changing the fracture spacing or fracture width, it can simulate the coal body structure with different degrees of fracture development, thereby studying the diffusion and filling characteristics of slurry under different fracture conditions. The transparent simulated borehole 2 is made of transparent material, which facilitates direct observation of the slurry migration process in the borehole and fractures through the visualization observation window 9.

[0021] The sound waves emitted by the acoustic wave transmitting probe 7-1 propagate inside the fractured coal body simulation module 1 and are received by the acoustic wave receiving probe 7-2. By analyzing the changes in sound wave propagation time, wave velocity and attenuation characteristics, the degree of filling of slurry in the fracture can be determined, thereby realizing the monitoring of the fracture filling status.

[0022] Example 2 This embodiment proposes an acoustic-visual coupled borehole grouting diffusion monitoring method, using an acoustic-visual coupled borehole grouting diffusion monitoring device from Embodiment 1, comprising the following steps: Step 1: Construct a fractured coal body simulation module 1, and set up a transparent simulated borehole 2 inside it. At the same time, install grouting pipe 3 and grout return pipe 4. Install acoustic wave transmitting probe 7-1 and acoustic wave receiving probe 7-2 on both sides of the fractured coal body simulation module 1, and connect it to acoustic wave signal processor 8 and data acquisition system 13. Step 2: Store the grouting material in the grout storage tank 5, and use the grouting pump 6 to deliver the grout to the grouting pipe 3, so that the grout enters the transparent simulated borehole 2 and diffuses into the fractured coal body; Step 3: During the grouting process, the grout diffusion process is observed in real time through a high-speed camera 10 and a visualization observation window 9, and stable lighting conditions are provided by an LED light source 11 to improve the image recording quality. Step 4: A sound wave signal is emitted through the sound wave transmitting probe 7-1 and received by the sound wave receiving probe 7-2. The sound wave propagation parameters are analyzed by the sound wave signal processor 8 to obtain the information on the crack filling status. Step 5: Record the grouting pressure changes through pressure sensor 12, and transmit the acoustic signal, pressure data and visualization image data synchronously to data acquisition system 13 for comprehensive analysis, so as to obtain the diffusion law and filling characteristics of grout in fractured coal body.

[0023] The above content is only a preferred embodiment of the present invention. For those skilled in the art, many changes can be made to the specific implementation based on the disclosed technical content. As long as these changes do not depart from the concept of the present invention, they all fall within the protection scope of this patent.

Claims

1. A borehole grouting diffusion monitoring device with acoustic-visual coupling, characterized in that: The system includes a transparent simulated borehole (2), a grouting pipe (3), a return grout pipe (4), a grout storage tank (5), a grouting pump (6), an acoustic wave emitting probe (7-1), an acoustic wave receiving probe (7-2), an acoustic wave signal processor (8), a visualization observation window (9), a high-speed camera (10), an LED light source (11), a pressure sensor (12), and a data acquisition system (13). The grouting pipe (3) and the return grout pipe (4) are arranged in parallel inside the transparent simulated borehole (2). One end of the grouting pipe (3) is connected to the grout storage tank (5) and the grouting pump (6), and the other end extends into the transparent simulated borehole (2). The return grout pipe (4) is used to recover excess grout and regulate the flow during the grouting process. Status; a transparent simulated borehole (2) is set inside the fractured coal body simulation module (1), and a visualization observation window (9) is set on the outside of the fractured coal body simulation module (1); a high-speed camera (10) and an LED light source (11) are set on the outside of the visualization observation window (9) to record the diffusion process of slurry in the fracture; an acoustic wave transmitting probe (7-1) and an acoustic wave receiving probe (7-2) are symmetrically set on both sides of the fractured coal body simulation module (1) and connected to the data acquisition system (13) through an acoustic wave signal processor (8) to monitor the changes in acoustic wave propagation characteristics during slurry filling; a pressure sensor (12) is installed on the grouting pipe (3) to monitor the changes in grouting pressure.

2. The acoustic-visual coupling borehole grouting diffusion monitoring device according to claim 1, characterized in that: The fractured coal body simulation module (1) consists of a transparent side plate, a coal body simulation block and an adjustable fracture plate. By adjusting the spacing between the adjustable fracture plates, it can simulate fracture structures of different widths and different degrees of development.

3. The acoustic-visual coupled borehole grouting diffusion monitoring device according to claim 1, characterized in that: The transparent simulated borehole (2) consists of a transparent organic glass tube and a sealing joint, and is used to simulate the structure of a coal mine borehole and to visualize the process of slurry transport inside the borehole.

4. The acoustic-visual coupling borehole grouting diffusion monitoring device according to claim 1, characterized in that: The grouting pump (6) is installed between the grout storage tank (5) and the grouting pipe (3). The injection speed and injection volume of the grout are controlled by adjusting the output pressure of the grouting pump (6).

5. The acoustic-visual coupling borehole grouting diffusion monitoring device according to claim 1, characterized in that: The acoustic wave emitting probe (7-1) and acoustic wave receiving probe (7-2) are set 2-5 cm away from the outer wall of the transparent simulated borehole (2) to monitor the changes in acoustic wave propagation speed and attenuation characteristics during the diffusion and filling of slurry in fractured coal.

6. The acoustic-visual coupled borehole grouting diffusion monitoring device according to claim 1, characterized in that: The data acquisition system (13) is used to simultaneously acquire acoustic signals, grouting pressure and visual image data, and to store and process the acquired data.

7. A method for monitoring borehole grout diffusion using acoustic-visual coupling, comprising using an acoustic-visual coupling borehole grout diffusion monitoring device as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Set up a transparent simulated borehole (2) in the fractured coal body simulation module (1), adjust the fracture structure according to the experimental requirements, and install the grouting pipe (3) and the return grout pipe (4) in the specified positions inside the transparent simulated borehole (2); Step 2: Install the acoustic wave transmitting probe (7-1) and acoustic wave receiving probe (7-2) on both sides of the fractured coal body simulation module (1), and connect them to the acoustic wave signal processor (8) and the data acquisition system (13). Step 3: Prepare and deliver grouting material through grout storage tank (5) and grouting pump (6), inject it into the transparent simulated borehole (2) through grouting pipe (3), so that the grout diffuses into the fractured coal body simulation module (1), and recover the excess grout through grout return pipe (4); Step 4: Use a high-speed camera (10) to record the diffusion and filling process of grout in the cracks through a visualization observation window (9), and at the same time monitor the changes in sound wave propagation characteristics through a sound wave transmitting probe (7-1) and a sound wave receiving probe (7-2), and record the changes in grouting pressure through a pressure sensor (12); Step 5: The acoustic signal, pressure data and visualization image are comprehensively analyzed by the data acquisition system (13) to obtain the slurry diffusion law and the crack filling state.

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