Magnetic fluid grouting system capable of actively guiding the diffusion direction of slurry and working method thereof

Abstract

The present disclosure belongs to the technical field of tunnel and underground engineering grouting, and particularly relates to a magnetic fluid grouting system capable of actively guiding the diffusion direction of slurry and a working method thereof, which comprises a slurry preparation unit, a pumping unit, a slurry injection pipeline, a slurry leading pipeline and a slurry diffusion guiding unit; the slurry preparation unit comprises a slurry raw material storage and a slurry mixer; the pumping unit adopts a grouting pump and a high-pressure-resistant grouting hose; the slurry injection pipeline adopts a galvanized degaussing steel pipe; the slurry leading pipeline adopts a galvanized degaussing steel pipe, which provides a migration channel for the led magnetic fluid slurry and verifies the slurry diffusion range; the slurry diffusion guiding unit comprises a power supply box, a circuit controller, a negative pressure liquid pumping pump, a backflow slurry storage tank and a magnetic yoke structure arranged at the front end of the galvanized degaussing steel pipe in the slurry leading pipeline; the slurry diffusion guiding unit is used for controlling the start and stop of electromagnetic effect in the magnetic yoke, regulating and controlling the electromagnetic force, and providing a negative pressure environment for the slurry leading pipeline.

Description

Technical Field

[0001] This disclosure belongs to the field of grouting technology for tunnels and underground engineering, specifically relating to a magnetohydrodynamic grouting system that can actively guide the diffusion direction of grout and its working method. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] In recent years, my country's tunnel and underground engineering industry has flourished. The construction of major projects such as the Yunnan Central Water Diversion Project and the Sichuan-Tibet Railway signifies a shift in the focus of tunnel and underground engineering construction towards the southwestern region, where geological conditions are more complex and construction is more challenging. Tunnel and underground engineering construction inevitably encounters adverse geological formations such as fault fracture zones and water-rich soft rock, making them highly susceptible to major geological disasters such as mudslides, water inrushes, and tunnel collapses, seriously threatening engineering construction and ecological environment safety. Grouting, as a primary method for managing geological disasters such as mudslides, water inrushes, and collapses, can effectively improve the impermeability and stability of water-rich, weak surrounding rock, reduce the risk of disasters, and ensure the safety of engineering construction and operation. Therefore, it is widely used in various engineering projects.

[0004] During grouting, the grout improves the properties of the soil and rock mass through penetration, compaction, and fracturing. The diffusion pattern of the grout largely controls the overall effect of the grouting construction. However, due to the heterogeneity of the soil and rock media and the complexity of their environment, the actual diffusion direction of the grout in the strata often exhibits significant dispersion, making it difficult to effectively control the diffusion path and range, and resulting in a lack of targeted treatment for adverse geological bodies. Furthermore, in actual engineering projects, excessive grouting pressure and difficulty in controlling the grout diffusion direction often lead to adverse effects of reverse diffusion of the grout on the existing tunnel structure, which can then cause damage to the support structure near the borehole. Therefore, the disordered diffusion of grout in the strata not only makes it difficult to guarantee the grouting effect on adverse geological bodies, but also leads to problems such as damage to existing structures, low construction efficiency, and serious material waste.

[0005] While significant progress has been made in research on grout diffusion mechanisms both domestically and internationally, research on methods and technologies for controlling grout diffusion direction in complex formations is extremely limited. Furthermore, existing domestic patents on point-controlled grouting primarily focus on the design and adjustment of grouting pipeline structures, with no relevant technologies or processes for actively guiding grout diffusion direction observed. Summary of the Invention

[0006] To address the aforementioned issues, this disclosure proposes a magnetic fluid grouting system and its operating method that can actively guide the direction of grout diffusion, thereby achieving effective control over the direction and range of grout diffusion and improving the targeting, implementation effectiveness, and construction efficiency of grouting treatment for mudslides and water inrushes in tunnels and underground engineering, as well as the reinforcement of water-rich soft surrounding rock.

[0007] According to some embodiments, the first solution of this disclosure provides a magnetohydrodynamic grouting system that can actively guide the diffusion direction of grout, adopting the following technical solution:

[0008] A magnetohydrodynamic grouting system capable of actively guiding the diffusion direction of slurry includes a slurry preparation unit, a pumping unit, a slurry injection pipeline, a slurry outlet pipeline, and a slurry diffusion guiding unit.

[0009] The slurry preparation unit includes a slurry raw material storage container and a slurry mixer, which are used to prepare magnetic fluid slurry and adjust the raw material ratio according to the slurry performance requirements.

[0010] The pumping unit uses a grouting pump and a high-pressure grouting hose to pump the magnetic fluid grout into the grout injection pipeline.

[0011] The slurry injection pipeline uses galvanized demagnetized steel pipe to guide the magnetic fluid slurry to one side of the grouting target area;

[0012] The slurry outlet pipeline uses galvanized demagnetized steel pipe to provide a transport channel for the outgoing magnetic fluid slurry and to verify the slurry diffusion range.

[0013] The slurry diffusion guiding unit includes a power supply box, a circuit controller, a negative pressure pump, a reflux slurry storage tank, and a magnetic yoke structure installed at the front end of a galvanized demagnetized steel pipe in the slurry outlet pipeline. The slurry diffusion guiding unit is used to control the start and stop of the electromagnetic effect in the magnetic yoke, regulate the magnitude of the electromagnetic force, and provide a negative pressure environment for the slurry outlet pipeline.

[0014] As a further technical limitation, the slurry preparation unit includes a slurry raw material storage container and a slurry mixer; wherein, the slurry raw material storage container is used to store various raw materials for preparing the magnetic fluid slurry, and the slurry mixer prepares a stable magnetic fluid slurry by continuous stirring.

[0015] As a further technical limitation, the pumping unit includes a grouting pump and a high-pressure grouting hose; the grouting pump is used to pump magnetic fluid grout into the grout injection pipeline; the high-pressure grouting hose is used to connect the grouting pump and the grout injection pipeline.

[0016] As a further technical limitation, the grout injection pipeline includes a galvanized demagnetized steel orifice pipe, a grout stop plug, and a galvanized demagnetized steel pipe with perforated ends; the orifice pipe is a galvanized demagnetized steel pipe buried at a certain depth within the grouting borehole opening, connected to a high-pressure grouting hose, sealing the borehole opening and isolating pressure; the grout stop plug is used to isolate the grouting pipeline in the shallow part of the borehole, so that the grout flows out from the perforated galvanized demagnetized steel pipe and moves into the formation, preventing the grout from flowing back towards the borehole opening; the perforated galvanized demagnetized steel pipe at the end is used to inject the magnetic fluid grout to one side of the target grouting area.

[0017] As a further technical limitation, the slurry outlet pipeline includes a galvanized demagnetized steel orifice pipe and a hollow galvanized demagnetized steel pipe with perforated ends; the galvanized demagnetized steel orifice pipe is buried within a certain depth range of the inlet and outlet borehole; the hollow galvanized demagnetized steel pipe with perforated ends is used to draw out excess magnetic fluid slurry from the other side of the grouting target area to verify the slurry diffusion direction and range.

[0018] As a further technical limitation, the slurry diffusion guiding unit includes a magnetic yoke structure, a power supply box, a circuit controller, a negative pressure pump, and a return slurry storage tank. The magnetic yoke structure is arranged at the front end of the hollow galvanized demagnetized steel pipe of the slurry outlet pipeline. It is an iron column with an n-turn electromagnetic conductive coil wound around it. When energized, it generates an electromagnetic force to guide the magnetic fluid slurry. A through hole is left in the center of the iron column to provide a transport channel for the slurry outlet. The power supply box is connected to the n-turn electromagnetic conductive coil through the circuit controller to provide power. The circuit controller is used to adjust the magnitude of the electromagnetic force. The negative pressure pump is placed behind the tunnel face and connected to the slurry outlet pipeline through a ball valve. After starting, it can create a negative pressure environment in the hollow galvanized demagnetized pipe to extract groundwater and guide the directional movement of the magnetic fluid slurry. The return slurry storage tank is used to collect the groundwater and magnetic fluid slurry discharged from the slurry outlet pipeline. The slurry diffusion guiding unit actively guides the diffusion direction of the magnetic fluid slurry through electromagnetic attraction and negative pressure.

[0019] According to some embodiments, the second aspect of this disclosure provides a working method for a magnetic fluid grouting system that can actively guide the grout diffusion direction, employing the magnetic fluid grouting system that can actively guide the grout diffusion direction described in the first aspect, and adopting the following technical solution:

[0020] A method for operating a magnetohydrodynamic grouting system capable of actively guiding the diffusion direction of grout includes:

[0021] Determine the target grouting area and borehole location;

[0022] Construct grouting boreholes, grout injection pipelines, drainage boreholes and grout outlet pipelines, and assemble pumping units and grout diffusion guiding units;

[0023] Check the equipment connection status of the slurry mixing tank, low-pressure grouting pump, circuit controller, negative pressure pump, and power supply box;

[0024] Preparation of magnetic fluid grout, and grouting construction;

[0025] Actively control the slurry diffusion direction, activate the circuit controller of the slurry diffusion guiding unit, gradually increase the control current, guide the magnetic fluid slurry through the grouting target area and diffuse towards the slurry outlet pipeline; when the magnetic fluid slurry is discharged from the outlet pipeline, the magnetic fluid slurry has reached the required diffusion direction and range.

[0026] As a further technical limitation, it also includes terminating the grouting operation. That is, when the flow rate of the magnetic fluid grout in the grout outlet pipeline gradually decreases and basically reaches the initial setting state, it is considered that the grouting termination condition has been met, and the grouting pump is then turned off to wait for the magnetic fluid grout to reach the final setting condition in the target grouting area.

[0027] As a further technical limitation, based on the determined location of the grout injection pipeline, a drilling rig is used to make grouting holes on the grout stop wall at the working face. A galvanized demagnetized steel orifice pipe is buried within a certain depth range at the orifice and connected to a high-pressure grouting hose. Then, a smaller diameter drill bit is used to continue drilling to the designed hole depth, and a galvanized demagnetized steel pipe with a perforated end is installed. A grout stop plug is installed at the front of the perforated section of the galvanized demagnetized steel pipe to prevent grout from flowing back towards the borehole opening.

[0028] As a further technical constraint, based on the determined location of the grout outlet pipeline, a drilling rig is used to drill holes in the grout stop wall to a suitable depth, and a galvanized demagnetized steel orifice pipe is buried within a certain depth range at the orifice opening; a smaller diameter drill bit is used to continue drilling to the designed hole depth, and a prefabricated hollow galvanized demagnetized grouting pipe with a front end connected to a magnetic yoke structure is placed in the grouting hole to form an outlet channel, providing conditions for guiding the diffusion direction of the magnetic fluid grout and evaluating the diffusion range.

[0029] Compared with the prior art, the beneficial effects of this disclosure are as follows:

[0030] This disclosure addresses the need for efficient management of mudslides and water inrushes in water-rich and weak strata of tunnels and underground engineering, as well as targeted reinforcement of adverse geological bodies. It proposes a magnetic fluid grouting system and its application method that can actively guide the diffusion direction of grout. Through the electromagnetic guiding force and negative pressure provided by the grout diffusion guiding unit, the system actively guides the diffusion direction of the magnetic fluid grout during grouting construction. This offers significant advantages such as controllable grout diffusion direction and range, and highly targeted grouting treatment. By actively controlling the diffusion direction of the magnetic fluid grout through electromagnetic guiding force and negative pressure attraction, it solves the problems of support structure damage and grout waste caused by excessive grouting pressure and unclear grout diffusion direction during conventional grouting construction, thus improving the safety and economy of grouting construction. The proposed magnetic fluid grouting system and operation method have the advantages of small equipment size, flexible spatial layout, strong adaptability to treatment schemes, and convenient operation, thereby improving grouting construction efficiency. Attached Figure Description

[0031] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0032] Figure 1 This is a longitudinal cross-sectional schematic diagram of the magnetohydrodynamic grouting system that can actively guide the diffusion direction of grout in Embodiment 1 of this disclosure;

[0033] Figure 2 This is a schematic diagram of the galvanized demagnetized steel pipe and magnetic yoke structure in Embodiment 1 of this disclosure;

[0034] The components include: 1. Slurry preparation unit; 2. Pumping unit; 3. Slurry injection pipeline; 4. Slurry outlet pipeline; 5. Slurry diffusion guiding unit; 6. Slurry raw material storage container; 7. Slurry mixer; 8. Magnetic fluid slurry; 9. Grouting pump; 10. High-pressure grouting hose; 11. Galvanized demagnetized steel pipe in the slurry injection pipeline; 12. Grouting target area; 13. Galvanized demagnetized steel pipe in the slurry outlet pipeline; 14. Slurry transport path; 15. Supply... 16. Electrical box; 17. Circuit controller; 18. Negative pressure pump; 19. Return slurry storage tank; 20. Coil wire; 21. Magnetic yoke structure; 22. Flexible hose; 23. Support structure; 24. Grout stop wall; 25. Galvanized steel orifice pipe in slurry injection pipeline; 26. Galvanized steel orifice pipe in slurry outlet pipeline; 27. Grout stop plug; 28. Tunnel surrounding rock; 29. ​​Pure iron column with through hole; 30. Electromagnetic conductive coil; 41. Grouting perforation hole. Detailed Implementation

[0035] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] In this disclosure, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements in this disclosure, and do not specifically refer to any component or element in this disclosure, nor should they be construed as limiting this disclosure.

[0039] In this disclosure, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this disclosure based on the specific circumstances, and they should not be construed as limitations on this disclosure.

[0040] Where there is no conflict, the embodiments and features described herein can be combined with each other.

[0041] Example 1

[0042] Embodiment 1 of this disclosure provides a magnetohydrodynamic grouting system that can actively guide the diffusion direction of grout.

[0043] As described in the background section, the diffusion direction of grout within adverse geological bodies in existing grouting technologies is random and discrete, resulting in significant uncertainty in the grout diffusion path and range. This prevents targeted grouting treatment of identified adverse geological bodies. In engineering practice, excessive grouting pressure and unclear grout diffusion direction often lead to pressurized grout acting in the opposite direction on existing tunnel support structures, causing damage to nearby support structures. Therefore, existing grouting technologies and processes suffer from weak targeting, low efficiency, and significant grout waste.

[0044] Based on this, this embodiment provides a magnetic fluid grouting system that can actively guide the diffusion direction of grout, providing technical support and methodological basis for the efficient treatment of mudslides and water inrushes in tunnels and underground engineering, and the effective reinforcement of water-rich soft surrounding rock. The magnetic fluid grout used in this system is formed by uniformly dispersing nano-magnetic particles in ordinary cement grout, and has both magnetic and fluidity characteristics. The system can provide electromagnetic attraction and negative pressure to actively guide the diffusion direction of the magnetic fluid grout, realizing the directional diffusion of grout in water-rich soft strata, thereby effectively improving the targeting, implementation effect and construction efficiency of grouting treatment, while also significantly reducing the adverse effects of grouting construction on existing tunnel structures.

[0045] like Figure 1 The magnetic fluid grouting system shown can actively guide the diffusion direction of grout, comprising five parts: grout preparation unit 1, pumping unit 2, grout injection pipeline 3, grout outlet pipeline 4, and grout diffusion guiding unit 5.

[0046] Among them, the slurry preparation unit 1 consists of a slurry raw material storage tank 6 and a slurry mixer 7, which are used to prepare the stirring magnetic fluid slurry 8 and adjust the raw material ratio according to the slurry performance requirements;

[0047] Pumping unit 2 mainly consists of grouting pump 9 and high-pressure grouting hose 10, used to pump magnetic fluid grout into grout injection pipeline 3;

[0048] The grout injection pipeline 3 is made of galvanized demagnetized steel pipe 11 and is used to introduce the magnetic fluid grout 8 to one side of the grouting target area 12.

[0049] The slurry outlet pipeline 4 is also made of galvanized demagnetized steel pipe 13, which can provide a transport channel for the outgoing magnetic fluid slurry and verify the slurry transport path 14;

[0050] The slurry diffusion guiding unit 5 consists of a power supply box 15, a circuit controller 16, a negative pressure pump 17, a reflux slurry storage tank 18, a coil wire 19, and a magnetic yoke structure 20 installed at the front end of the galvanized demagnetized steel pipe in the slurry outlet pipeline. It can control the start and stop of the electromagnetic effect in the magnetic yoke and adjust the magnitude of the electromagnetic force. It can also provide a negative pressure environment inside the galvanized demagnetized steel pipe 13 in the slurry outlet pipeline.

[0051] like Figure 2 As shown, the hollow galvanized demagnetized steel pipe 13 in the slurry outlet pipe 4 is connected at its front end to a pure iron column 28 with a through hole in the center. An electromagnetic conductive coil 29 with n turns is wound around the column to form a strong magnetic induction coil, providing electromagnetic attraction for the magnetic fluid slurry. At the end of the hollow galvanized demagnetized steel pipe 13 is a grouting perforation 30, allowing the magnetic fluid slurry 8 to pass through.

[0052] Example 2

[0053] This disclosure provides a second embodiment of a working method for a magnetic fluid grouting system that can actively guide the direction of grout diffusion, which employs the magnetic fluid grouting system described in the first embodiment.

[0054] A method for operating a magnetohydrodynamic grouting system capable of actively guiding the diffusion direction of grout includes the following steps:

[0055] Determine the grouting target area and the borehole location; specifically, based on geophysical exploration and drilling methods, determine the location and boundary of the water-rich soft surrounding rock treatment area in front of the tunnel face, determine the grout injection pipeline location, borehole depth and angle on one side of the grouting target area, and determine the grout outlet pipeline location, borehole depth and angle on the other side of the grouting target area.

[0056] Construct grouting boreholes and grout injection pipelines; specifically, based on the determined location of the grout injection pipelines, use a drilling rig to construct grouting holes on the grout stop wall at the working face, embed galvanized demagnetized steel borehole pipes within a certain depth range at the borehole opening, and connect them to high-pressure grouting hoses; then continue drilling to the designed hole depth using a smaller diameter drill bit, and install galvanized demagnetized steel pipes with perforated ends; place a grout stop plug at the front of the perforated section of the galvanized demagnetized steel pipe to prevent grout from flowing back towards the borehole opening;

[0057] Construct the drainage borehole and grout outlet pipeline; specifically, based on the determined location of the grout outlet pipeline, use a drilling rig to drill holes in the grout stop wall to a suitable depth, and bury a galvanized demagnetized steel borehole pipe within a certain depth range at the borehole opening; continue drilling to the designed hole depth using a smaller diameter drill bit, and place the prefabricated hollow galvanized demagnetized grouting pipe with a pre-fabricated front-end connected magnetic yoke structure (with an iron column welded to the front end and wrapped with n turns of electromagnetic conductive coil) into the grouting hole to form an outlet channel, providing conditions for guiding the diffusion direction and evaluating the diffusion range of the magnetic fluid grout. The construction method of the grout outlet pipeline is similar to that of the magnetic fluid grout injection pipeline described above;

[0058] Assemble the pumping unit; specifically, connect the grouting pump, grouting hose and grout injection pipeline, and place the suction pipe of the small grouting pump into the grout mixing tank;

[0059] Assemble the slurry diffusion guiding unit; specifically, the negative pressure pump is placed behind the tunnel face, and the slurry outlet pipeline is connected to the negative pressure pump through a hose and a reducing straight pipe. The circuit controller is connected to the lead wire of the n-turn electromagnetic conductive coil, and a 220V power supply is connected to the external power supply box.

[0060] Test the equipment; specifically, check the connection and working status of equipment such as slurry mixing tank, low-pressure grouting pump, circuit controller, negative pressure pump, and power supply box to prepare for grouting operations.

[0061] Prepare magnetic fluid slurry; specifically, based on the time it takes for the slurry to travel from the injection pipeline to the outlet pipeline, evaluate the reasonable gelation time range of the slurry, and determine the magnetic fluid slurry mix ratio based on field tests; place the pre-prepared water-based magnetic fluid colloidal material with appropriate amounts of cement, water, and water glass in a slurry mixer, and mix thoroughly to prepare a stable magnetic fluid slurry colloidal system;

[0062] Grouting construction; specifically, the negative pressure pump is turned on to extract groundwater in the perforated area at the end of the grout outlet pipe to create a negative pressure environment. Then, the magnetic fluid grout in the grout mixer is continuously pumped into the injection pipe through the grouting pump, and the grout is injected into the target grouting area through the perforated area at the end of the galvanized demagnetized steel pipe.

[0063] Actively control the direction of slurry diffusion; specifically, turn on the circuit controller of the slurry diffusion guiding unit, gradually increase the control current, guide the magnetic fluid slurry through the grouting target area and diffuse towards the slurry outlet pipeline; when the magnetic fluid slurry is discharged from the outlet pipeline, it indicates that the magnetic fluid slurry has reached the required diffusion direction and range;

[0064] Terminate grouting operation; specifically, when the flow rate of magnetic fluid grout in the grout outlet pipeline gradually decreases and basically reaches the initial setting state, it is considered that the grouting termination condition has been met, and the grouting pump is then turned off to wait for the magnetic fluid grout to reach the final setting condition in the target grouting area.

[0065] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

[0066] While the specific embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this disclosure. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this disclosure are still within the scope of protection of this disclosure.

Claims

1. A magnetohydrodynamic grouting system capable of actively guiding the diffusion direction of grout, characterized in that, It includes a slurry preparation unit, a pumping unit, a slurry injection pipeline, a slurry outlet pipeline, and a slurry diffusion guiding unit; The slurry preparation unit includes a slurry raw material storage container and a slurry mixer, which are used to prepare magnetic fluid slurry and adjust the raw material ratio according to the slurry performance requirements. The pumping unit uses a grouting pump and a high-pressure grouting hose to pump the magnetic fluid grout into the grout injection pipeline. The slurry injection pipeline uses galvanized demagnetized steel pipe to guide the magnetic fluid slurry to one side of the grouting target area; The slurry outlet pipeline uses galvanized demagnetized steel pipe to provide a transport channel for the outgoing magnetic fluid slurry and to verify the slurry diffusion range. The slurry diffusion guiding unit includes a power supply box, a circuit controller, a negative pressure pump, a reflux slurry storage tank, and a magnetic yoke structure installed at the front end of a galvanized demagnetized steel pipe in the slurry outlet pipeline. The slurry diffusion guiding unit is used to control the start and stop of the electromagnetic effect in the magnetic yoke, regulate the magnitude of the electromagnetic force, and provide a negative pressure environment for the slurry outlet pipeline.

2. The magnetohydrodynamic grouting system as described in claim 1, characterized in that, The slurry preparation unit includes a slurry raw material storage container and a slurry mixer; wherein, the slurry raw material storage container is used to store various raw materials for preparing magnetic fluid slurry, and the slurry mixer prepares a stable magnetic fluid slurry by continuous stirring.

3. The magnetohydrodynamic grouting system as described in claim 1, characterized in that, The pumping unit includes a grouting pump and a high-pressure grouting hose; the grouting pump is used to pump magnetic fluid grout into the grout injection pipeline; the high-pressure grouting hose is used to connect the grouting pump and the grout injection pipeline.

4. The magnetohydrodynamic grouting system as described in claim 1, characterized in that, The grout injection pipeline includes a galvanized demagnetized steel orifice pipe, a grout stop plug, and a galvanized demagnetized steel pipe with perforated ends. The orifice pipe is a galvanized demagnetized steel pipe buried at a certain depth at the grouting borehole opening, connected to a high-pressure grouting hose, sealing the borehole opening and isolating pressure. The grout stop plug is used to isolate the grouting pipeline in the shallow part of the borehole, allowing the grout to flow out from the perforated galvanized demagnetized steel pipe and move into the formation, preventing the grout from flowing back towards the borehole opening. The perforated galvanized demagnetized steel pipe at the end is used to inject the magnetic fluid grout to one side of the target grouting area.

5. The magnetohydrodynamic grouting system as described in claim 1, characterized in that, The slurry outlet pipeline includes a galvanized demagnetized steel orifice pipe and a hollow galvanized demagnetized steel pipe with perforated ends; the galvanized demagnetized steel orifice pipe is buried within a certain depth range of the orifice of the slurry outlet borehole; the hollow galvanized demagnetized steel pipe with perforated ends is used to draw out excess magnetic fluid slurry from the other side of the grouting target area to verify the slurry diffusion direction and range.

6. The magnetohydrodynamic grouting system as described in claim 1, characterized in that, The slurry diffusion guiding unit includes a magnetic yoke structure, a power supply box, a circuit controller, a negative pressure pump, and a return slurry storage tank. The magnetic yoke structure is located at the front end of the hollow galvanized demagnetized steel pipe of the slurry outlet pipeline. It is an iron column with n turns of electromagnetic conductive coil wound around it. When energized, it generates electromagnetic force to guide the magnetic fluid slurry. A through hole is left in the center of the iron column to provide a transport channel for the slurry outlet. The power supply box is connected to the n turns of electromagnetic conductive coil through the circuit controller to provide power. The circuit controller is used to adjust the magnitude of the electromagnetic force. The negative pressure pump is located behind the tunnel face and is connected to the slurry outlet pipeline through a ball valve. After starting, it can create a negative pressure environment in the hollow galvanized demagnetized pipe to extract groundwater and guide the directional movement of the magnetic fluid slurry. The return slurry storage tank is used to collect the groundwater and magnetic fluid slurry discharged from the slurry outlet pipeline. The slurry diffusion guiding unit actively guides the diffusion direction of the magnetic fluid slurry through electromagnetic attraction and negative pressure.

7. A method for operating a magnetohydrodynamic grouting system capable of actively guiding the grout diffusion direction, comprising the magnetohydrodynamic grouting system capable of actively guiding the grout diffusion direction as described in any one of claims 1-6, characterized in that, include: Determine the target grouting area and borehole location; Construct grouting boreholes, grout injection pipelines, drainage boreholes and grout outlet pipelines, and assemble pumping units and grout diffusion guiding units; Check the equipment connection status of the slurry mixing tank, low-pressure grouting pump, circuit controller, negative pressure pump, and power supply box; Preparation of magnetic fluid grout, and grouting construction; Actively control the slurry diffusion direction, activate the circuit controller of the slurry diffusion guiding unit, gradually increase the control current, guide the magnetic fluid slurry through the grouting target area and diffuse towards the slurry outlet pipeline; when the magnetic fluid slurry is discharged from the outlet pipeline, the magnetic fluid slurry has reached the required diffusion direction and range.

8. The working method of the magnetohydrodynamic grouting system capable of actively guiding the diffusion direction of grout as described in claim 7, characterized in that, It also includes terminating the grouting operation, that is, when the flow rate of the magnetic fluid grout in the grout outlet pipeline gradually decreases and basically reaches the initial setting state, it is considered that the grouting termination condition has been met, and the grouting pump is then turned off to wait for the magnetic fluid grout to reach the final setting condition in the target grouting area.

9. The working method of the magnetohydrodynamic grouting system capable of actively guiding the diffusion direction of grout as described in claim 7, characterized in that, Based on the determined location of the grout injection pipeline, a drilling rig is used to create grouting holes on the grout stop wall at the working face. A galvanized demagnetized steel orifice pipe is buried within a certain depth range at the orifice and connected to a high-pressure grouting hose. Then, a smaller diameter drill bit is used to continue drilling to the designed hole depth, and a galvanized demagnetized steel pipe with a perforated end is installed. A grout stop plug is placed at the front of the perforated section of the galvanized demagnetized steel pipe to prevent grout from flowing back towards the borehole opening.

10. The working method of a magnetohydrodynamic grouting system capable of actively guiding the diffusion direction of grout as described in claim 7, characterized in that, Based on the determined location of the grout outlet pipeline, a drilling rig is used to open a hole in the grout stop wall and drill to a suitable depth. A galvanized demagnetized steel orifice pipe is buried within a certain depth range at the orifice opening. A smaller diameter drill bit is used to continue drilling to the designed hole depth. The prefabricated hollow galvanized demagnetized grouting pipe with a front end connected to a magnetic yoke structure is placed in the grouting hole to form an outlet channel, providing conditions for guiding the diffusion direction of the magnetic fluid grout and evaluating the diffusion range.

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