Nanoscale grouting method for illite smectite mixed layer surrounding rock

Abstract

The invention relates to a nanoscale grouting method for illite-smectite mixed layer surrounding rock, which is characterized by comprising the following steps of: S1, combined detection of a borehole television and a ground penetrating radar or a geological radar: carrying out rock mass structure detection in a manner of combining the borehole television and the ground penetrating radar or the geological radar, and obtaining a deformation rule of a roadway and surrounding rock in an area; s2, arranging grouting pipes and an exhaust pipe: arranging two long and short grouting pipes and one exhaust pipe in the grouting hole according to the deformation rule of the roadway and the surrounding rock in combination with numerical simulation of rock mass mechanics and the result of the numerical simulation; s3, grouting is conducted, specifically, grouting is conducted in a deep and shallow hole matching grouting mode; s4, secondary splitting grouting reinforcement is conducted, specifically, the mine illite-smectite mixed layer surrounding rock is reinforced through a secondary splitting grouting technology, the unfilled part in the primary grouting process is made up, and it is ensured that all gaps are filled with grout; and the illite smectite mixed layer surrounding rock can be grouted well.

Description

Technical Field

[0001] The present application relates to the technical field of surrounding rock grouting, and in particular to a nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock. Background Art

[0002] In recent years, with the continuous advancement of mining engineering technology and the interpenetration of various disciplines, new grouting theories, construction techniques, grouting materials, grouting equipment, and grouting effect testing methods have been continuously developed and researched, resulting in significant progress in grouting technology. With the development of nanotechnology, the application of nanomaterials in grouting is becoming increasingly common. Currently, the surrounding rock of illite-montmorillonite mixed layers exposed underground in metal mines exhibits significant water absorption, softening, and expansion characteristics, resulting in fragmentation and low strength. Illite-montmorillonite mixed layers exhibit a typical molecular expansion mechanism and swell significantly when exposed to water. Existing large deformation tunnels in mines are closely related to the effects of groundwater. However, the surrounding rock of illite-montmorillonite mixed layers is characterized by well-developed joints and fissures, especially hidden joints. The rock mass exhibits a short self-stabilization time after exposure, resulting in high deviatoric stresses after excavation. This instability in the surrounding rock leads to large loose and plastic zones. The illite-montmorillonite mixed layers undergo large rheological deformation under the influence of groundwater and construction water, leading to problems such as collapse and poor injectability with conventional grouting methods. Therefore, introducing nanomaterial slurry with lower viscosity into the field of grouting in illite-montmorillonite mixed layer surrounding rock will not only expand the grouting range to the submicron level in terms of particle size, but also greatly reduce the viscosity of the slurry, thereby greatly improving the injectability of the slurry. This will be a leap forward for grouting technology. Currently, there is no technology for grouting in the field of illite-montmorillonite mixed layer surrounding rock. Summary of the Invention

[0003] In order to solve or partially solve the problems existing in the related art, the present application provides a nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock, which can better grout the illite-montmorillonite mixed layer surrounding rock.

[0004] The present application discloses a nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock, comprising the following steps: S1: Borehole TV combined with ground penetrating radar or geological radar for detection: Use a combination of borehole television and ground-penetrating radar or geological radar to conduct rock structure detection and obtain the deformation patterns of the tunnels and surrounding rocks in the area; S2: Arrange grouting pipes and exhaust pipes: According to the deformation law of the roadway and surrounding rock, combined with the numerical simulation of rock mechanics and its results, two long and short grouting pipes and one exhaust pipe are arranged in the grouting hole; S3: Grouting: Grouting is carried out by combining deep and shallow holes; S4: Secondary splitting grouting reinforcement: Secondary splitting grouting technology is used to reinforce the surrounding rock of the mine's I-Mon mixed layer to make up for the unfilled parts during the first grouting process and ensure that all gaps are filled with slurry.

[0005] Optionally, in step S2, the exhaust pipe is a hose, and the exhaust hose is arranged in the grouting hole.

[0006] Optionally, in step S3, the slurry uses nano-scale grouting material with a water-cement ratio of 0.45-0.5:1, 7-9% nano zeolite, 4-6‰ UEA expansion agent, 0.5-1.5‰ water reducer and 1.5-2.5% early strength agent.

[0007] Optionally, in step S3, high-pressure grouting is used to allow the slurry to fully penetrate into the loose and broken surrounding rock.

[0008] Optionally, between step S2 and step S3, an aquifer is intercepted outside the surrounding rock and drainage holes are arranged for construction.

[0009] Optionally, in step S3, the slurry uses nano-scale grouting material with a water-cement ratio of 0.5:1, 7% nano zeolite, 6‰ UEA expansion agent, 1.5‰ water reducer and 1.5% early strength agent.

[0010] Optionally, in step S3, the slurry uses nano-scale grouting material with a water-cement ratio of 0.47:1, 9% nano zeolite, 4‰ UEA expansion agent, 0.5‰ water reducer and 2.5% early strength agent.

[0011] Optionally, in step S3, the slurry uses nano-scale grouting material with a water-cement ratio of 0.45:1, 8% nano zeolite, 5‰ UEA expansion agent, 1‰ water reducer and 2% early strength agent.

[0012] Optionally, high pressure grouting is used with a pressure of not less than 2 MPa.

[0013] The technical solution provided by this application may have the following beneficial effects: This method utilizes a special grouting material ratio and a combination of deep and shallow holes to increase the injectability of both deep and shallow layers of the illite-montmorillonite surrounding rock. High-pressure grouting allows the slurry to fully penetrate the loose and broken surrounding rock, increasing its strength. Aquifers are intercepted outside the surrounding rock, and drainage holes are constructed to prevent groundwater from invading the illite-montmorillonite surrounding rock. Secondary splitting grouting technology is used to reinforce the illite-montmorillonite surrounding rock in mines, compensating for any gaps left unfilled during the primary grouting process and ensuring that all voids are filled with slurry. This effectively prevents the expansion of loosened strata in the surrounding area, further strengthening the formation structure. Slurry can fully penetrate pores and cracks, increasing the strength and stability of the structure. In formations with poor permeability, splitting grouting can utilize its hydraulic pressure to create split pores in the formation, improving its injectability and thus meeting the requirements of grouting reinforcement.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0016] Figure 1 This is a flow chart shown in an embodiment of the present application; DETAILED DESCRIPTION The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0017] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0018] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0019] Unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0020] In response to the above problems, an embodiment of the present application provides a nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock. The technical solution of the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0021] like Figure 1 A nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock is shown, comprising the following steps: S1: Borehole TV combined with ground penetrating radar or geological radar for detection: Use a combination of borehole television and ground-penetrating radar or geological radar to conduct rock structure detection and obtain the deformation patterns of the tunnels and surrounding rocks in the area; S2: Arrange grouting pipes and exhaust pipes: According to the deformation law of the tunnel and surrounding rock, combined with the numerical simulation of rock mechanics, the deformation and damage of the loose and broken surrounding rock of the chamber group under the combined influence of high ground stress, disturbance caused by the excavation of the chamber group and rheological effect, as well as the evolution law of the surrounding rock stress and displacement, two long and short grouting pipes and one exhaust pipe are arranged in the grouting hole; S3: Grouting: Grouting is carried out by combining deep and shallow holes. During grouting, high-pressure grouting is used to allow the slurry to fully penetrate into the loose and broken surrounding rock. The grouting pressure must be no less than 2Mpa. The grouting holes can be arranged according to the spacing between them to achieve the diffusion radius and improve the injectability of the slurry. S4: Secondary splitting grouting reinforcement: Secondary splitting grouting technology is used to reinforce the surrounding rock of the mine's I-Mon mixed layer to make up for the unfilled parts during the first grouting process and ensure that all gaps are filled with slurry.

[0022] The exhaust pipe is a flexible hose, installed within the grouting hole. The grouting fluid uses nano-grade grouting material with a water-cement ratio of 0.45-0.5:1, internally blended with 7-9% nano-zeolite, 4-6‰ UEA expansion agent, 0.5-1.5‰ water reducer, and 1.5-2.5% early strength agent. Before grouting, aquifers are intercepted outside the surrounding rock mass, and drainage holes are constructed to prevent groundwater from invading the illite-montmorillonite mixed layer. Secondary splitting grouting is used to reinforce the illite-montmorillonite mixed layer surrounding the mine, compensating for gaps left unfilled by the initial grouting process and ensuring that all voids are filled with slurry. This effectively prevents further loosening of the surrounding strata, further strengthening the strata. The slurry is able to fully penetrate pores and cracks, enhancing the strength and stability of the structure. In formations with poor permeability, splitting grouting can utilize its hydraulic pressure to create split pores within the formation, improving injectability and achieving the required grouting reinforcement.

[0023] This method utilizes a special grouting material ratio and a combination of deep and shallow holes to increase the injectability of both deep and shallow layers of the illite-montmorillonite surrounding rock. High-pressure grouting allows the slurry to fully penetrate the loose and broken surrounding rock, increasing its strength. Aquifers are intercepted outside the surrounding rock, and drainage holes are constructed to prevent groundwater from invading the illite-montmorillonite surrounding rock. Secondary splitting grouting technology is used to reinforce the illite-montmorillonite surrounding rock in mines, compensating for any gaps left unfilled during the primary grouting process and ensuring that all voids are filled with slurry. This effectively prevents the expansion of loosened strata in the surrounding area, further strengthening the formation structure. Slurry can fully penetrate pores and cracks, increasing the strength and stability of the structure. In formations with poor permeability, splitting grouting can utilize its hydraulic pressure to create split pores in the formation, improving its injectability and thus meeting the requirements of grouting reinforcement.

[0024] In one embodiment, a nanoscale grouting method for illite / montmorillonite mixed layer surrounding rock comprises the following steps: S1: Borehole TV combined with ground penetrating radar or geological radar for detection: Use a combination of borehole television and ground-penetrating radar or geological radar to conduct rock structure detection and obtain the deformation patterns of the tunnels and surrounding rocks in the area; S2: Arrange grouting pipes and exhaust pipes: According to the deformation law of the tunnel and surrounding rock, combined with the numerical simulation of rock mechanics, the deformation and damage of the loose and broken surrounding rock of the chamber group under the combined influence of high ground stress, disturbance caused by the excavation of the chamber group and rheological effect, as well as the evolution law of the surrounding rock stress and displacement, two long and short grouting pipes and one exhaust pipe are arranged in the grouting hole; S3: Grouting: Grouting is carried out by combining deep and shallow holes. During grouting, high-pressure grouting is used to allow the slurry to fully penetrate into the loose and broken surrounding rock. The grouting pressure must be no less than 2Mpa. The grouting holes can be arranged according to the spacing between them to achieve the diffusion radius and improve the injectability of the slurry. S4: Secondary splitting grouting reinforcement: Secondary splitting grouting technology is used to reinforce the surrounding rock of the mine's I-Mon mixed layer to make up for the unfilled parts during the first grouting process and ensure that all gaps are filled with slurry.

[0025] The exhaust pipe is a flexible hose, installed within the grouting hole. The grouting fluid utilizes nano-grade grouting material with a water-cement ratio of 0.47:1, internally blended with 9% nano-zeolite, 4‰ UEA expansion agent, 0.5‰ water reducer, and 2.5% early strength agent. Before grouting, aquifers were intercepted outside the surrounding rock mass, and drainage holes were constructed to prevent groundwater from invading the montmorillonite mixed layer. Secondary splitting grouting technology is used to reinforce the montmorillonite mixed layer surrounding the mine, compensating for gaps left unfilled by the primary grouting process and ensuring that all voids are filled with slurry. This effectively prevents further loosening of the surrounding strata, further strengthening the strata. The slurry is able to fully penetrate pores and cracks, enhancing the strength and stability of the structure. In formations with poor permeability, splitting grouting can utilize its hydraulic pressure to create split pores within the formation, improving injectability and achieving the required grouting reinforcement.

[0026] This method utilizes a special grouting material ratio and a combination of deep and shallow holes to increase the injectability of both deep and shallow layers of the illite-montmorillonite surrounding rock. High-pressure grouting allows the slurry to fully penetrate the loose and broken surrounding rock, increasing its strength. Aquifers are intercepted outside the surrounding rock, and drainage holes are constructed to prevent groundwater from invading the illite-montmorillonite surrounding rock. Secondary splitting grouting technology is used to reinforce the illite-montmorillonite surrounding rock in mines, compensating for any gaps left unfilled during the primary grouting process and ensuring that all voids are filled with slurry. This effectively prevents the expansion of loosened strata in the surrounding area, further strengthening the formation structure. Slurry can fully penetrate pores and cracks, increasing the strength and stability of the structure. In formations with poor permeability, splitting grouting can utilize its hydraulic pressure to create split pores in the formation, improving its injectability and thus meeting the requirements of grouting reinforcement.

[0027] In one embodiment, a nanoscale grouting method for illite / montmorillonite mixed layer surrounding rock comprises the following steps: S1: Borehole TV combined with ground penetrating radar or geological radar for detection: Use a combination of borehole television and ground-penetrating radar or geological radar to conduct rock structure detection and obtain the deformation patterns of the tunnels and surrounding rocks in the area; S2: Arrange grouting pipes and exhaust pipes: According to the deformation law of the tunnel and surrounding rock, combined with the numerical simulation of rock mechanics, the deformation and damage of the loose and broken surrounding rock of the chamber group under the combined influence of high ground stress, disturbance caused by the excavation of the chamber group and rheological effect, as well as the evolution law of the surrounding rock stress and displacement, two long and short grouting pipes and one exhaust pipe are arranged in the grouting hole; S3: Grouting: Grouting is carried out by combining deep and shallow holes. During grouting, high-pressure grouting is used to allow the slurry to fully penetrate into the loose and broken surrounding rock. The grouting pressure must be no less than 2Mpa. The grouting holes can be arranged according to the spacing between them to achieve the diffusion radius and improve the injectability of the slurry. S4: Secondary splitting grouting reinforcement: Secondary splitting grouting technology is used to reinforce the surrounding rock of the mine's I-Mon mixed layer to make up for the unfilled parts during the first grouting process and ensure that all gaps are filled with slurry.

[0028] The exhaust pipe is a flexible hose, installed within the grouting hole. The grouting fluid utilizes nano-grade grouting material with a water-cement ratio of 0.5:1, internally blended with 7% nano-zeolite, 6‰ UEA expansion agent, 1.5‰ water reducer, and 1.5% early strength agent. Before grouting, aquifers were intercepted outside the surrounding rock mass, and drainage holes were constructed to prevent groundwater from invading the illite-montmorillonite mixed layer. Secondary splitting grouting technology is used to reinforce the illite-montmorillonite mixed layer surrounding the mine, compensating for gaps left unfilled by the primary grouting process and ensuring that all voids are filled with slurry. This effectively prevents further loosening of the surrounding strata, further strengthening the strata. The slurry is able to fully penetrate pores and cracks, enhancing the strength and stability of the structure. In formations with poor permeability, splitting grouting can utilize its hydraulic pressure to create split pores within the formation, improving injectability and achieving the required grouting reinforcement.

[0029] This method utilizes a special grouting material ratio and a combination of deep and shallow holes to increase the injectability of both deep and shallow layers of the illite-montmorillonite surrounding rock. High-pressure grouting allows the slurry to fully penetrate the loose and broken surrounding rock, increasing its strength. Aquifers are intercepted outside the surrounding rock, and drainage holes are constructed to prevent groundwater from invading the illite-montmorillonite surrounding rock. Secondary splitting grouting technology is used to reinforce the illite-montmorillonite surrounding rock in mines, compensating for any gaps left unfilled during the primary grouting process and ensuring that all voids are filled with slurry. This effectively prevents the expansion of loosened strata in the surrounding area, further strengthening the formation structure. Slurry can fully penetrate pores and cracks, increasing the strength and stability of the structure. In formations with poor permeability, splitting grouting can utilize its hydraulic pressure to create split pores in the formation, improving its injectability and thus meeting the requirements of grouting reinforcement.

[0030] In one embodiment, a nanoscale grouting method for illite / montmorillonite mixed layer surrounding rock comprises the following steps: S1: Borehole TV combined with ground penetrating radar or geological radar for detection: Use a combination of borehole television and ground-penetrating radar or geological radar to conduct rock structure detection and obtain the deformation patterns of the tunnels and surrounding rocks in the area; S2: Arrange grouting pipes and exhaust pipes: According to the deformation law of the tunnel and surrounding rock, combined with the numerical simulation of rock mechanics, the deformation and damage of the loose and broken surrounding rock of the chamber group under the combined influence of high ground stress, disturbance caused by the excavation of the chamber group and rheological effect, as well as the evolution law of the surrounding rock stress and displacement, two long and short grouting pipes and one exhaust pipe are arranged in the grouting hole; S3: Grouting: Grouting is carried out by combining deep and shallow holes. During grouting, high-pressure grouting is used to allow the slurry to fully penetrate into the loose and broken surrounding rock. The grouting pressure should be no less than 2Mpa. The grouting holes can be arranged according to the spacing between them to achieve the diffusion radius and improve the injectability of the slurry. S4: Secondary splitting grouting reinforcement: Secondary splitting grouting technology is used to reinforce the surrounding rock of the mine's I-Mon mixed layer to make up for the unfilled parts during the first grouting process and ensure that all gaps are filled with slurry.

[0031] The exhaust pipe is a flexible hose, installed within the grouting hole. The grouting fluid utilizes nano-grade grouting material with a water-cement ratio of 0.45:1, internally blended with 8% nano-zeolite, 5‰ UEA expansion agent, 1‰ water reducer, and 2% early strength agent. Before grouting, aquifers are intercepted outside the surrounding rock mass, and drainage holes are constructed to prevent groundwater from invading the illite-montmorillonite mixed layer. Secondary splitting grouting technology is used to reinforce the illite-montmorillonite mixed layer surrounding the mine, compensating for gaps left unfilled during the primary grouting process and ensuring that all voids are filled with slurry. This effectively prevents further loosening of the surrounding strata, further strengthening the strata. The slurry is able to fully penetrate pores and cracks, enhancing the strength and stability of the structure. In formations with poor permeability, splitting grouting can utilize its hydraulic pressure to create split pores within the formation, improving injectability and achieving the required grouting reinforcement.

[0032] This method utilizes a special grouting material ratio and a combination of deep and shallow holes to increase the injectability of both deep and shallow layers of the illite-montmorillonite surrounding rock. High-pressure grouting allows the slurry to fully penetrate the loose and broken surrounding rock, increasing its strength. Aquifers are intercepted outside the surrounding rock, and drainage holes are constructed to prevent groundwater from invading the illite-montmorillonite surrounding rock. Secondary splitting grouting technology is used to reinforce the illite-montmorillonite surrounding rock in mines, compensating for any gaps left unfilled during the primary grouting process and ensuring that all voids are filled with slurry. This effectively prevents the expansion of loosened strata in the surrounding area, further strengthening the formation structure. Slurry can fully penetrate pores and cracks, increasing the strength and stability of the structure. In formations with poor permeability, splitting grouting can utilize its hydraulic pressure to create split pores in the formation, improving its injectability and thus meeting the requirements of grouting reinforcement.

[0033] Finally, it should be noted that, in this document, relationships such as first and second, etc., are used solely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms include, comprise, or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0035] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock, characterized in that: The following steps are involved: S1: Borehole TV combined with ground penetrating radar or geological radar for detection: Use a combination of borehole television and ground-penetrating radar or geological radar to conduct rock structure detection and obtain the deformation patterns of the tunnels and surrounding rocks in the area; S2: Arrange grouting pipes and exhaust pipes: According to the deformation law of the tunnel and surrounding rock, combined with the numerical simulation of rock mechanics and its results, two long and short grouting pipes and one exhaust pipe are arranged in the grouting hole; S3: Grouting: Grouting is carried out by combining deep and shallow holes; S4: Secondary splitting grouting reinforcement: Secondary splitting grouting technology is used to reinforce the surrounding rock of the mine's I-S-Monogatari mixed layer, making up for the unfilled parts during the first grouting process and ensuring that all gaps are filled with slurry.

2. The nanoscale grouting method for illite-montmorillonite mixed layer surrounding rock according to claim 1, characterized in that: In step S2, the exhaust pipe is a hose, and the exhaust hose is arranged in the grouting hole.

3. The nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock according to claim 1, characterized in that: In step S3, the slurry uses nano-scale grouting material with a water-cement ratio of 0.45-0.5:1, 7-9% nano zeolite, 4-6‰ UEA expansion agent, 0.5-1.5‰ water reducer and 1.5-2.5% early strength agent.

4. The nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock according to claim 1, characterized in that: In step S3, high-pressure grouting is used to allow the slurry to fully penetrate into the loose and broken surrounding rock.

5. The nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock according to claim 1, characterized in that: Between step S2 and step S3, the aquifer is intercepted outside the surrounding rock and drainage holes are arranged and constructed.

6. The nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock according to claim 1, characterized in that: In step S3, the slurry uses nano-scale grouting material with a water-cement ratio of 0.5:1, 7% nano zeolite, 6‰ UEA expansion agent, 1.5‰ water reducer and 1.5% early strength agent.

7. The nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock according to claim 1, characterized in that: In step S3, the slurry uses nano-scale grouting material with a water-cement ratio of 0.47:1, 9% nano zeolite, 4‰ UEA expansion agent, 0.5‰ water reducer and 2.5% early strength agent.

8. The nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock according to claim 1, characterized in that: In step S3, the slurry uses nano-scale grouting material with a water-cement ratio of 0.45:1, 8% nano zeolite, 5‰ UEA expansion agent, 1‰ water reducer and 2% early strength agent.

9. The nano-scale grouting method for illite-montmorillonite mixed layer surrounding rock according to claim 4, characterized in that: The pressure of the high-pressure grouting method is not less than 2Mpa.

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