A slurry, a method for preparing the same, and a grouting system

Abstract

The application discloses a slurry and a preparation method and a grouting system thereof, relates to the technical field of the grouting system, and aims to solve the problem of insufficient sand (rock debris) carrying capacity of the slurry. The slurry comprises a continuous phase, solid phase particles and a chemical additive; wherein the continuous phase comprises micro-nano bubble water, and the average particle size of the micro-nano bubble water ranges from 0.05 microns to 300 microns; and the slurry can be applied to pipe jacking construction.

Description

Technical Field

[0001] This application relates to the field of grouting system technology, and more particularly to a grout and its preparation method, and a grouting system. Background Technology

[0002] Existing grouts for pipe jacking construction can be optimized for key indicators such as viscosity, lubricity, and stability through outstanding adaptability and functionality. They can form a dense, thin, and tough mud cake on the outer wall of the pipe, which has excellent water retention and impermeability as well as drag reduction effect, effectively reducing jacking resistance and equipment wear.

[0003] However, the grout has insufficient capacity to carry sand (rock cuttings), especially in long-distance or large-diameter pipe jacking construction, where rock cuttings are prone to settling and accumulating, leading to increased local resistance in the pipeline and even pipe jamming accidents. Summary of the Invention

[0004] The purpose of this application is to provide a grout, a method for preparing the grout, and a grouting system.

[0005] To achieve the above objectives, this application adopts the following technical solution: In a first aspect, this application provides a slurry. The slurry comprises: a continuous phase, solid particles, and chemical additives; wherein the continuous phase comprises: micro / nano bubble water, the average particle size of which ranges from 0.05 μm to 300 μm.

[0006] The slurry provided in this application embodiment uses micro-nano bubble water as the continuous phase, combined with solid particles (such as bentonite) and chemical additives. The micro-nano bubble water adheres to the surface of the solid particles (such as bentonite) to form an "air film," which can effectively reduce the effective density and agglomeration tendency of the particles, achieving stable suspension. The micro-nano bubble water forms a micro-ball-like "air cushion" between the pipe wall and the slurry, or on the shear surface inside the slurry, which can partially transform traditional solid-solid or solid-liquid friction into low-resistance gas-liquid-solid friction, significantly reducing flow resistance and achieving uniform distribution. Dispersed micro-nano bubble water can hinder the sedimentation of solid particles and, in synergy with chemical additives, form a more stable three-dimensional spatial network structure, enhancing the slurry's resistance to shear thinning and thixotropic recovery. In other words, micro-nano bubble water can play multiple roles such as gas film suspension, air cushion lubrication, and three-dimensional network stabilization, enabling the slurry to form a stable "gas-solid-liquid" ternary system. This achieves efficient transport of rock cuttings, low-resistance flow of slurry, rapid and stable preparation, and maintenance of long-distance circulation performance, ultimately improving the efficiency, safety, and adaptability of pipe jacking construction, while reducing energy consumption.

[0007] In some embodiments, the volume percentage of micro-nanobubbles in the micro-nanobubble water ranges from 0.5% to 2%.

[0008] In some embodiments, the absolute value of the Zeta potential of the micro / nano bubble water is greater than or equal to 20 mV.

[0009] In some embodiments, based on the mass of the slurry, the slurry comprises: 80 to 85 parts of micro-nano bubble water, 8 to 12 parts of solid particles, and 3 to 15 parts of chemical additives.

[0010] In some embodiments, the solid particles include bentonite.

[0011] In some embodiments, the chemical additives include at least one of rheology modifiers, stabilizers, anti-collapse agents, and density modifiers.

[0012] Secondly, this application provides a method for preparing a slurry. The method includes: adding solid particles to a continuous phase for hydration treatment, and then adding chemical additives and stirring to obtain a slurry, wherein the continuous phase includes micro / nano bubble water, and the average particle size of the micro / nano bubble water ranges from 0.05 μm to 300 μm.

[0013] In some embodiments, adding solid particles to a continuous phase for hydration treatment includes: adding solid particles to the continuous phase at a first stirring speed for hydration treatment. Adding chemical additives and stirring includes: adding chemical additives and stirring at a second stirring speed to obtain a slurry. The second stirring speed is greater than the first stirring speed.

[0014] Thirdly, this application provides a grouting system. The grouting system includes: a controller, a grout preparation device, and a micro / nano bubble maintaining device. The grout preparation device is connected to the controller; the micro / nano bubble maintaining device is connected to both the controller and the grout preparation device; wherein, the controller is configured to: control the grout preparation device to prepare grout, and control the micro / nano bubble maintaining device to continuously generate and replenish micro / nano bubbles during the grouting process; the grout preparation device is configured to: receive a preparation signal from the controller, and form a grout from a continuous phase, solid particles, and chemical additives; the micro / nano bubble maintaining device is configured to: receive a bubble maintaining signal from the controller, and provide a continuous phase for the grout; wherein, the continuous phase is micro / nano bubble water with an average particle size ranging from 50 nm to 300 μm.

[0015] In some embodiments, the slurry preparation apparatus includes: a micro / nano bubble generator, a component addition device, and a slurry storage device. The component addition device is connected to the micro / nano bubble generator; the slurry storage device is connected to both the component addition device and the micro / nano bubble generator.

[0016] In some embodiments, the grouting system further includes: a grout regeneration device. The grout regeneration device is connected to a component addition device and a micro / nano bubble generator; and to a grout storage device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The rheological properties of the slurry of this application and the comparative example slurry at different standing times are shown in the diagram. Figure 7 A flowchart illustrating a method for preparing a slurry, provided as an embodiment of this application; Figure 8 A schematic diagram of a grouting system provided for embodiments of this application; Figure 9 This is a schematic diagram of a grouting system provided for an embodiment of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0022] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0023] The role of grout in pipe jacking construction is to lubricate, reduce friction, and support the strata. It is a key material to ensure the safety and efficiency of the project. During construction, a "grout sleeve" is formed to isolate the pipe from the surrounding soil, thereby significantly reducing frictional resistance and controlling surface settlement.

[0024] In some implementation methods, functional additives such as PAM, plant gum, carboxymethyl cellulose, and graphite powder are compounded in the grout used for pipe jacking construction. Some formulations are supplemented with alkaline inorganic substances to adjust the performance, forming a multi-component synergistic system. Its technical characteristics highlight adaptability and functionality. It can specifically optimize key indicators such as viscosity, lubricity, and stability. It can form a dense, thin, and tough mud film on the outer wall of the pipe, which has excellent water retention and impermeability as well as drag reduction effect, effectively reducing jacking resistance and equipment wear.

[0025] However, in long-distance or large-diameter pipe jacking construction, rock cuttings are prone to settling and accumulation, leading to increased local resistance in the pipeline and even pipe jamming accidents. Existing traditional slurries are difficult to control in terms of rheological properties, often sacrificing fluidity to ensure suspension capacity, resulting in high slurry viscosity, high flow resistance during pumping, significantly increased energy consumption, and low efficiency in long-distance transportation.

[0026] Furthermore, the on-site preparation of grout is inefficient, requiring prolonged mixing and settling, which extends the construction preparation cycle and makes it difficult to meet the demands of fast-paced construction. Additionally, in long-distance, complex geological conditions, existing traditional grouts exhibit poor physicochemical stability, with their performance rapidly declining over time. This makes them prone to solid-phase sedimentation and liquid-phase precipitation, leading to instability in the circulation system and hindering the maintenance of continuous tunneling capacity.

[0027] Based on this, embodiments of this application provide a slurry. The slurry comprises: a continuous phase, solid particles, and chemical additives; wherein the continuous phase comprises: micro / nano bubble water, the average particle size of which ranges from 0.05 μm to 300 μm.

[0028] For example, the average particle size of micro / nano bubble water can be 0.05μm, 10μm, 50μm, 100μm, 150μm, 200μm, 250μm or 300μm, etc., and there is no limitation here.

[0029] For example, the solid particles can be bentonite.

[0030] For example, chemical additives include at least one of rheology modifiers, stabilizers, anti-collapse agents, and density modifiers.

[0031] Understandably, the slurry uses micro-nano bubble water as the continuous phase, combined with solid particles (such as bentonite) and chemical additives. The micro-nano bubble water adheres to the surface of the solid particles (such as bentonite), forming an "air film," which can effectively reduce the effective density and agglomeration tendency of the particles, achieving stable suspension. The micro-nano bubble water forms micro-ball-like "air cushions" between the pipe wall and the slurry, or on the shear surface inside the slurry, which can partially transform traditional solid-solid or solid-liquid friction into low-resistance gas-liquid-solid friction, significantly reducing flow resistance; and achieving uniform dispersion. Micro-nano bubble water can hinder the sedimentation of solid particles and, in synergy with chemical additives, form a more stable three-dimensional spatial network structure, enhancing the slurry's resistance to shear thinning and thixotropic recovery. In other words, micro-nano bubble water can play multiple roles such as gas film suspension, air cushion lubrication, and three-dimensional network stabilization, enabling the slurry to form a stable "gas-solid-liquid" ternary system. This achieves efficient transport of rock cuttings, low-resistance flow of slurry, rapid and stable preparation, and maintenance of long-distance circulation performance, ultimately improving the efficiency, safety, and adaptability of pipe jacking construction, while reducing energy consumption.

[0032] In some embodiments, the volume percentage of micro-nanobubbles in the micro-nanobubble water ranges from 0.5% to 2%.

[0033] For example, the volume percentage of micro-nano bubbles in micro-nano bubble water can be 0.5%, 0.75%, 1%, 1.25%, 1.5%, 1.75%, or 2%, etc., and there is no limitation here.

[0034] Understandably, setting the volume percentage of micro-nano bubbles in the micro-nano bubble water to a range of 0.5% to 2% can avoid a sharp increase in energy consumption or excessive compressibility of the slurry due to too many bubbles. It can also avoid excessive reduction in the effective viscosity or density of the slurry due to too many bubbles, ensuring that it still has sufficient cuttings carrying capacity and formation support.

[0035] In some embodiments, the absolute value of the Zeta potential of the micro / nano bubble water is greater than or equal to 20 mV.

[0036] Understandably, setting the absolute value of the Zeta potential of the micro-nano bubble water to be greater than or equal to 20mV can make the micro-nano bubble water and the surface of solid particles (such as bentonite) carry a stronger like charge. The resulting strong electrostatic repulsion can effectively prevent the merging of bubbles and the aggregation of bubbles and solid particles. This not only ensures that the micro-nano bubbles exist in the slurry in a small and uniform form for a long time, maintaining the durability of "air cushion lubrication" and "air film suspension", but also inhibits the secondary precipitation of solid particles, thereby ensuring that the performance of the slurry is minimal during long-distance pipe jacking construction and effectively extending the applicable distance and storage time of the slurry.

[0037] In some embodiments, based on the mass of the slurry, the slurry comprises: 80 to 85 parts of micro-nano bubble water, 8 to 12 parts of solid particles, and 3 to 15 parts of chemical additives.

[0038] For example, the micro-nano bubble water can be 80 parts, 81 parts, 82 parts, 83 parts, 84 parts or 85 parts, etc., and there is no limit here.

[0039] For example, the solid particles can be 8 parts, 9 parts, 10 parts, 11 parts or 12 parts, etc., and there is no limitation here.

[0040] For example, the chemical additives can be 3 parts, 5 parts, 7 parts, 9 parts, 11 parts or 15 parts, etc., and there is no limitation here.

[0041] Understandably, the above setup can further enable the grout to form a stable "gas-solid-liquid" ternary system, achieving efficient transport of rock cuttings, low-resistance flow of grout, rapid and stable preparation, and long-distance circulation performance maintenance, ultimately improving the efficiency, safety, and adaptability of pipe jacking construction, and reducing energy consumption.

[0042] like Figures 1-6 As shown, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The diagram shows the rheological properties of the slurry of this application and the comparative slurry at different standing times. The horizontal axis represents the shear rate in 1 / s, and the vertical axis represents the shear magnetic force in Pa. The continuous phase in the comparative slurry is pure water, and the other components are the same as those in this application. Figure 1 This diagram shows the rheological properties of the slurry when the settling time is 0, i.e., immediately after it is prepared. Figure 2 The diagram shows the rheological properties of the slurry after a settling time of 1 hour. Figure 3 The diagram shows the rheological properties of the slurry after a settling time of 2 hours. Figure 4 The diagram shows the rheological properties of the slurry after a settling time of 3 hours. Figure 5 The diagram shows the rheological properties of the slurry after a settling time of 4 hours. Figure 6 The diagram shows the rheological properties of the slurry after a settling time of 5 hours.

[0043] Using the rheological properties of the slurry of this application and the comparative slurry at different standing times, and based on the Herschel-Bulkley rheological model, the stability comparison data of the slurry of this application and the comparative slurry can be calculated through nonlinear least squares fitting, as shown in Table 1 below.

[0044] Table 1. Stability comparison data of the slurry in this application and the comparative example slurry.

[0045] It should be noted that in Table 1, γ0 represents the yield stress of the slurry, k represents the consistency coefficient of the slurry, and n represents the rheological index of the slurry.

[0046] As shown in Table 1, compared with the comparative slurry (with pure water as the continuous phase), the slurry of this application exhibits higher dynamic shear force (chip-carrying capacity), lower consistency coefficient (lower pumping resistance), and more stable rheological properties after a standing time of 5 hours. This indicates that the "gas-solid-liquid" ternary system constructed with micro-nano bubble water as the continuous phase can effectively suppress the degradation of slurry performance and is more suitable for long-distance pipe jacking construction.

[0047] Embodiments of this application provide a method for preparing a slurry. For example... Figure 7 As shown, the preparation method of the slurry includes: S1~S2.

[0048] S1: Add solid particles to the continuous phase for hydration treatment.

[0049] S2: Add chemical additives and stir to obtain a slurry, wherein the continuous phase includes: micro-nano bubble water, the average particle size of the micro-nano bubble water ranges from 0.05μm to 300μm.

[0050] Understandably, the beneficial effects that the preparation method of the slurry can achieve can be referred to the beneficial effects of the slurry mentioned above, and will not be repeated here.

[0051] In some embodiments, S1 involves adding solid particles to the continuous phase for hydration treatment, including: adding solid particles to the continuous phase at a first stirring speed for hydration treatment. S2 involves adding chemical additives and stirring, including: adding chemical additives and stirring at a second stirring speed to obtain a slurry. The second stirring speed is greater than the first stirring speed.

[0052] For example, micro-nano bubble water is stirred at 200 rpm to 400 rpm (first stirring speed), bentonite is slowly added, and the mixture is stirred for 10 to 15 minutes to complete the initial hydration and form an initial dispersion system. While maintaining the first stirring speed, rheology modifiers, stabilizers and other additives are added in sequence, and then the stirring speed is increased to 600 rpm to 1000 rpm (second stirring speed) and stirred for 10 to 20 minutes. The mixture is monitored in real time by a viscometer and a densitometer, and the final slurry is formed after the standard is met.

[0053] Understandably, the second stirring speed is larger than the first stirring speed, which can form a two-stage graded stirring system during the preparation of the slurry, ensuring that the slurry system is uniform and stable.

[0054] Embodiments of this application provide a grouting system 1000. For example... Figure 8 and Figure 9 As shown, the grouting system includes: a controller 6, a grout preparation device 1, and a micro / nano bubble maintenance device 5.

[0055] The slurry preparation device 1 is connected to the controller 6. The micro / nano bubble holding device 5 is connected to the controller 6 and also to the slurry preparation device 1.

[0056] The controller 6 is configured to control the slurry preparation device 1 to prepare slurry and to control the micro-nano bubble maintaining device 5 to continuously generate and replenish micro-nano bubbles during the grouting process.

[0057] The slurry preparation apparatus 1 is configured to receive a preparation signal from the controller 6 and form a slurry from a continuous phase, solid particles, and chemical additives. The continuous phase is micro / nano bubble water with an average particle size ranging from 50 nm to 300 μm.

[0058] The micro / nano bubble maintaining device 5 is configured to receive a bubble maintaining signal from the controller 6 and provide a continuous phase for the slurry.

[0059] In some examples, the grout preparation device 1 further includes a real-time monitoring device 7, which is connected to the grout preparation device 1 and the micro / nano bubble maintaining device 5, and is also connected to the controller 6. The real-time monitoring device 7 transmits the data detected by the grout preparation device 1 and the micro / nano bubble maintaining device 5 to the controller 6 to realize real-time adjustment of the grouting system 1000.

[0060] Understandably, the slurry preparation device 1 first forms an initial "gas-solid-liquid" slurry with micro-nano bubble water as the continuous phase; then, during the pipe jacking grouting process, the micro-nano bubble maintaining device 5 continuously replenishes the slurry with micro-nano bubbles lost due to high-pressure flow or natural extinction according to the controller instructions, thereby achieving sustained air film suspension, air cushion lubrication and three-dimensional network stability throughout the entire jacking distance, avoiding frictional increase or chip-carrying capacity reduction due to bubble loss, and significantly improving the reliability, safety and efficiency of ultra-long-distance pipe jacking construction.

[0061] In some embodiments, such as Figure 8 and Figure 9 As shown, the slurry preparation device 1 includes: a micro / nano bubble generator 101, a component addition device 104, and a slurry storage device 105. The component addition device 104 is connected to the micro / nano bubble generator 101; the slurry storage device 105 is connected to the component addition device 104 and also to the micro / nano bubble generator 101.

[0062] In some examples, the slurry preparation device 1 further includes: a stirrer 103 and a micro / nano bubble water storage tank 102, wherein the stirrer 103 is connected to the slurry storage device 105 and to the micro / nano bubble water storage tank 102; the micro / nano bubble water storage tank 102 is connected to the micro / nano bubble generating device 101.

[0063] The component addition device 104 can add solid particles and chemical additives to the grouting system 1000. After being stirred with the micro-nano bubble water generated by the micro-nano bubble generator 101, the mixture is stored in the slurry storage device 105.

[0064] Understandably, the slurry preparation device 1, through the collaboration of the micro-nano bubble generator 101 and the component addition device 104, realizes a continuous preparation process of first generating micro-nano bubbles and then mixing the slurry. The micro-nano bubble generator 101 first generates a base fluid with micro-nano bubble water as the continuous phase. Then, the component addition device 104 injects solid particles such as bentonite and chemical additives into the micro-nano bubble water. Finally, the slurry preparation is completed in the slurry storage device 105. This can improve the working stability and service life of the slurry preparation device 1. At the same time, by directly using micro-nano bubble water as a dispersion medium to mix with the solid phase, the micro-nano bubble water can preferentially adsorb on the surface of bentonite particles to form a "gas film", which helps to reduce the agglomeration tendency of solid particles and accelerate slurry hydration, thereby quickly preparing a high-quality slurry with uniform bubble distribution and high suspension stability, providing an immediate and reliable lubrication and support medium for pipe jacking construction.

[0065] In some embodiments, such as Figure 8 and Figure 9 As shown, the grouting system 1000 also includes a grout regeneration device 4. The grout regeneration device 4 is connected to the component addition device 104, and to the micro / nano bubble generator 101; and to the grout storage device 105.

[0066] In some examples, the grouting system 1000 also includes a pipe jacking machine 3, an injection pump 8, and a return pump 9. The injection pump 8 is connected to the pipe jacking machine 3 and is connected to the grout storage device 105.

[0067] In some examples, the slurry regeneration device 4 includes a filter 401 and a regeneration chamber 402. The regeneration chamber 402 is connected to the component addition device 104; the filter 401 is connected to the regeneration chamber 402 and is also connected to the pipe jacking machine 3. The reflux pump 9 is connected to the filter 401 and to the pipe jacking machine 3.

[0068] Understandably, by integrating the slurry regeneration device 4 and constructing a closed-loop circulation system, closed-loop recycling and resource utilization of the slurry in pipe jacking construction are achieved. Specifically, the waste slurry discharged from the annulus at the tail of the pipe jacking machine 3 is pumped to a filter by the return pump 9 to initially remove large rock cuttings, and then enters the regeneration chamber 402. In the regeneration chamber 402, based on the detected bubble content and rheological performance deficiencies, the synergistic component addition device replenishes the lost solid particles and chemical additives, and the micro-nano bubble generator re-injects micro-nano bubbles to restore continuous phase performance. Finally, the regenerated slurry is sent back to the slurry storage device 105 for reuse by the injection pump 8. This can significantly reduce the consumption of fresh bentonite and water resources and the cost of waste slurry transportation and treatment in pipe jacking construction. By continuously maintaining the micro-nano bubble content and Zeta potential stability in the slurry, the lubrication, cuttings carrying, and wall protection performance of the slurry are ensured not to decline during long-distance jacking, while reducing the on-site slurry pool area and environmental pollution risks. This is a key technology integration for achieving green, efficient, and low-cost construction in ultra-long-distance, large-diameter pipe jacking projects.

[0069] In summary, the grout and its preparation method and grouting system provided in this application are applicable to the fields of trenchless pipe jacking construction and underground engineering slurry management technology, including long-distance pipe jacking construction, large-diameter pipe jacking construction, construction in complex strata (sand layer, gravel layer, highly permeable soil layer), construction with combustible gas / high methane risk, construction in confined spaces, and pipe jacking construction sensitive to oxidation.

[0070] Furthermore, with the rapid expansion of trenchless engineering projects such as urban underground utility tunnels, municipal pipe networks, and traffic tunnels, the demand for long-distance, complex-stratum pipe jacking construction continues to grow, and existing pipe jacking grouts are insufficient to meet the demand. This application addresses four core issues: sand carrying capacity, low resistance, rapid mixing, and stable circulation. It can be widely applied to pipe jacking projects in municipal, transportation, and energy sectors, and is particularly suitable for high-standard, high-difficulty construction scenarios, with strong market demand. At the same time, its energy-saving, safe, and efficient characteristics align with the green construction trend in the engineering field, making it valuable for large-scale promotion.

[0071] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A slurry, characterized in that, include: Continuous phase, solid particles and chemical additives; The continuous phase includes micro / nano bubble water, wherein the average particle size of the micro / nano bubble water ranges from 0.05 μm to 300 μm.

2. The slurry according to claim 1, characterized in that, The volume percentage of micro-nano bubbles in the micro-nano bubble water ranges from 0.5% to 2%.

3. The slurry according to claim 1, characterized in that, The absolute value of the Zeta potential of the micro-nano bubble water is greater than or equal to 20mV.

4. The slurry according to claim 1, characterized in that, Based on the mass of the slurry, the slurry comprises: 80 to 85 parts of micro-nano bubble water, 8 to 12 parts of solid particles, and 3 to 15 parts of chemical additives.

5. The slurry according to claim 4, characterized in that, The solid particles include: bentonite; and / or, The chemical additives include at least one of the following: rheology modifiers, stabilizers, anti-collapse agents, and density modifiers.

6. A method for preparing a slurry, characterized in that, Solid particles are added to a continuous phase for hydration treatment, and then chemical additives are added and stirred to obtain a slurry. The continuous phase includes micro-nano bubble water, and the average particle size of the micro-nano bubble water ranges from 0.05 μm to 300 μm.

7. The method for preparing the slurry according to claim 6, characterized in that, The hydration treatment by adding solid particles to the continuous phase includes: adding solid particles to the continuous phase at a first stirring speed for hydration treatment; The addition of chemical additives and stirring includes: adding chemical additives and stirring at a second stirring speed to obtain a slurry; The second stirring speed is greater than the first stirring speed.

8. A grouting system, characterized in that, include: Controller; A slurry preparation device is connected to the controller; A micro / nano bubble holding device is connected to the controller and the slurry preparation device; The controller is configured to: control the slurry preparation device to prepare slurry, and control the micro-nano bubble maintaining device to continuously generate and replenish micro-nano bubbles during the grouting process; The slurry preparation apparatus is configured to receive a preparation signal from a controller and form a slurry from a continuous phase, solid particles, and chemical additives. The micro / nano bubble maintaining device is configured to receive a bubble maintaining signal from a controller and provide a continuous phase for the slurry; The continuous phase is micro-nano bubble water with an average particle size ranging from 50 nm to 300 μm.

9. The grouting system according to claim 8, characterized in that, The slurry preparation apparatus includes: Micro-nano bubble generator; The component addition device is connected to the micro / nano bubble generator; The slurry storage device is connected to the component addition device and the micro / nano bubble generator.

10. The grouting system according to claim 9, characterized in that, The grouting system also includes: The slurry regeneration device is connected to the component addition device and the micro / nano bubble generating device; and is also connected to the slurry storage device.

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