A method for controlling the dispersion of solid waste slurry under the action of moving water in stages

Abstract

The application discloses a kind of full solid waste slurry under dynamic water scouring phase coordination synergistic anti-dispersion regulation methods, belong to underground engineering grouting plugging technical field, this method faces underwater, seepage scouring, fissure water conduction, karst passage and goaf and other complex dynamic water environment, the behavior of slurry in dynamic water grouting is divided into four continuous stages of pumping diffusion, water entry anti-analysis, residence locking and hardening low permeability, and four types of control links of dispersion flow regulation, water binding anti-analysis regulation, setting locking regulation and defoaming dense regulation are established respectively;The application determines the main control index of each stage of slurry according to the intensity of dynamic water scouring, passage opening, target diffusion distance, allowed locking time and low permeability requirement after plugging, and through the progressive combination of four types of control links, so that the full solid waste slurry can be pumped and diffused in the injection stage, the particle migration and slurry segregation can be inhibited in the water entry stage, the cohesive deposition boundary can be quickly formed in the residence stage, and the continuous low permeability plugging structure can be formed in the hardening stage.

Description

Technical Field

[0001] This invention belongs to the field of underground engineering grouting and sealing technology, specifically involving a phased synergistic anti-dispersion control method for all-solid waste slurry under dynamic water scouring. It is applicable to grouting and sealing scenarios under continuous hydraulic disturbance conditions such as underwater, seepage, water inrush, fissure water conduction, karst cave channels, mining subsidence areas, and groundwater pollution migration channels. Background Technology

[0002] In underground space development, karst area seepage control, mine goaf remediation, landfill seepage prevention and restoration, and groundwater pollution prevention projects, grouting slurry needs to complete its transport, diffusion, residence, coagulation, and hardening under continuous dynamic water disturbance. Compared to still or anhydrous conditions, dynamic water scouring can dilute the slurry, cause particle migration, shearing and stripping, boundary disruption, and pore connectivity, making it difficult for the slurry to settle stably in the target area. This can easily lead to engineering problems such as slurry leakage, segregation, incomplete filling, discontinuous sealing, and secondary leakage.

[0003] The core challenge of grouting under dynamic water flushing lies in the interdependent performance requirements at different stages: the injection stage requires sufficient fluidity and diffusion capacity of the grout; the water entry stage requires the grout to resist water flow disturbance and suppress particle segregation; the residence stage requires the grout to form a stable cohesive boundary within an allowable time; and the hardening stage requires the sealing body to have a continuous low-permeability structure. Simply increasing the grout viscosity will weaken its pumping and diffusion capacity. Simply increasing the amount of water-reducing agent or water will increase the risk of dispersion in the water; simply shortening the setting time will compress the construction window and increase the risk of pipe blockage; and focusing only on later strength will not solve the problem of passive water flushing of the grout in the initial water entry stage.

[0004] Existing technologies often employ single control methods, such as simply increasing viscosity, shortening setting time, or pursuing later-stage strength. This leads to performance conflicts such as "flowing in but not being retained, retaining but not expanding, setting quickly but easily clogging pipes, and having sufficient strength but discontinuous barrier function," making it difficult to achieve synergy throughout the entire process. Current technologies still lack a systematic control method encompassing the entire process of flowing water flushing, and especially lack a technical solution that can simultaneously coordinate injectability, anti-dispersion, rapid locking capability, and low-permeability sealing capability in a complete solid waste slurry system. Summary of the Invention

[0005] Technical Problem Solved: In response to the problems existing in the background technology, the present invention provides a staged synergistic anti-dispersion control method for solid waste slurry under dynamic water flushing. Through stage division, progressive control and feedback correction, the stage behavior of slurry under dynamic water flushing conditions is taken as the control object. The slurry control is divided into four progressive stages: dispersion and flow retention, water binding and anti-segregation, coagulation and locking, and defoaming and densification. This enables continuous synergistic control of the entire process of pumpable diffusion, water injection and anti-segregation, rapid locking and hardening and low permeability of solid waste slurry in complex dynamic water environment, solving the technical bottleneck of "difficult injection, inability to retain, unstable coagulation and difficulty in blocking seepage" of slurry in dynamic water environment.

[0006] Technical solution: The present invention provides a staged synergistic anti-dispersion control method for solid waste slurry under dynamic water flushing, comprising the following steps: Step S1: Identify the dynamic water scouring conditions and sealing targets of the area to be grouted; the dynamic water scouring conditions and sealing targets include the intensity of water flow disturbance, the opening of the leakage channel, the connectivity of the channel, the target diffusion distance, the allowable locking time, and the low permeability requirements after sealing; Step S2: The process of grout action in dynamic water grouting is divided into pumping and diffusion stage, water ingress and anti-segregation stage, residence and locking stage and hardening and low permeability stage; Step S3: Establish performance control requirements for the pumping diffusion stage, the influent anti-dialysis stage, the retention and locking stage, and the hardening and low permeability stage, respectively; Step S4: Construct a solid waste cementitious matrix using blast furnace slag, red mud, carbide slag and fly ash, and mix it with water to form a basic slurry; Step S5: The basic slurry is subjected to dispersion and flow retention regulation, water binding and anti-segregation regulation, coagulation and locking regulation, and defoaming and densification regulation in sequence; Step S6: Based on the test results of slurry fluidity, underwater turbidity, setting time, compressive strength and permeability coefficient, feedback corrections are made to the above-mentioned dispersion and flow retention control, water binding and anti-segregation control, coagulation and locking control and defoaming and densification control; the slurry that meets the performance control requirements of each stage is used for grouting and sealing under dynamic water flushing environment.

[0007] Preferably, in step S3, the pumping diffusion stage uses fluidity as the main control index, with a slurry fluidity of 130-220 mm; the water ingress anti-segregation stage uses underwater turbidity as the main control index, with underwater turbidity not exceeding 150 NTU; the residence lock-in stage uses setting time as the main control index, with initial setting time not exceeding 60 min under strong scouring and rapid lock-in conditions; and the hardening and low permeability stage uses compressive strength and permeability coefficient as the main control indexes, with a 28-day compressive strength not less than 7 MPa and a 28-day permeability coefficient not greater than 1 × 10⁻⁶. -9 m / s.

[0008] Preferably, in step S5, the dispersion and flow control uses a polycarboxylate superplasticizer; The water-binding anti-precipitation control uses hydroxypropyl methylcellulose; The coagulation-locking control is composed of a mixture of liquid aluminum oxide clinker coagulant and solid aluminum sulfate coagulant; The defoaming and density control uses a polyether-based defoamer.

[0009] Preferably, in step S4, based on 100 parts of the total solid waste cementitious matrix, the mass parts of each component are: 30-60 parts of blast furnace slag, 10-30 parts of red mud, 20-30 parts of calcium carbide slag, 10-30 parts of fly ash, and 50-70 parts of water.

[0010] Preferably, the mass fractions of each component of the all-solid waste cementitious matrix are: 36 parts blast furnace slag, 24 parts red mud, 30 parts calcium carbide slag, 10 parts fly ash, and 60 parts water.

[0011] Preferably, based on 100 parts of the solid waste gel matrix, the mass parts of each admixture are as follows: 0.6-1.2 parts of polycarboxylate superplasticizer, 0.3-0.4 parts of hydroxypropyl methylcellulose, 10 parts of liquid aluminum oxide clinker accelerator, 4-8 parts of solid aluminum sulfate accelerator, and 0.1-0.4 parts of polyether defoamer.

[0012] Preferably, in step S6, the feedback correction includes: (1) When the fluidity is below the target range, prioritize increasing the dosage of polycarboxylate superplasticizer instead of increasing the water consumption; (2) When the underwater turbidity is higher than the target range, increase the amount of hydroxypropyl methylcellulose and simultaneously increase the coagulation and lock-in control level; (3) When the initial setting time exceeds the allowable locking time, increase the proportion of solid aluminum sulfate accelerator; (4) When the permeability coefficient of the hardened body is higher than the target range, the polyether defoamer should be controlled at 0.2-0.4 parts, and the coagulation and locking control should be kept at a medium-high level.

[0013] Preferably, six implementation methods are formed according to the dynamic water flushing conditions and the plugging target, which are adapted to different working conditions: extremely low turbidity rapid coagulation plugging implementation method, low turbidity stable deposition implementation method, medium speed locking and anti-dispersion implementation method, flow preservation and anti-scouring diffusion implementation method, high flocculation and low permeability plugging implementation method, and strong scouring comprehensive implementation method.

[0014] Preferably, the strong scouring comprehensive implementation method is based on 100 parts of solid waste gel matrix: 1.2 parts of polycarboxylate superplasticizer, 0.3 parts of hydroxypropyl methylcellulose, 10 parts of liquid aluminum oxide clinker accelerator, 8 parts of solid aluminum sulfate accelerator, and 0.2 parts of polyether defoamer.

[0015] Preferably, the application scenarios of the method include: underground engineering grouting, karst channel filling, fractured rock mass reinforcement, goaf treatment, landfill anti-seepage curtain, groundwater leakage channel sealing, and underwater void area reinforcement.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention decomposes the problem of grouting instability under dynamic water scouring into four continuous stages: pumping diffusion, water infiltration anti-segregation, residence and locking, and hardening and low permeability. It avoids the performance conflicts caused by simply increasing viscosity, simply accelerating setting or simply increasing strength, and achieves performance balance throughout the process. 2. This invention proposes four progressive control steps: dispersion and flow retention, water binding and anti-segregation, coagulation and locking, and defoaming and densification. These steps enable the slurry to achieve different main control properties at different stages, which compensate for each other and can simultaneously take into account injectability, anti-dispersion, rapid locking ability and low-permeability sealing ability. 3. This invention incorporates fluidity, underwater turbidity, setting time, compressive strength, and permeability into the same control chain through feedback correction rules, enabling the slurry ratio to be adjusted in a targeted manner according to dynamic water conditions and on-site test results; 4. This invention uses blast furnace slag, red mud, carbide slag and fly ash to construct a solid waste cementitious matrix, without relying on liquid water glass or strong alkaline activators, to realize the resource utilization of solid waste, and has the advantages of resource utilization, low carbon and environmental protection and on-site adaptability. 5. This invention establishes a quantifiable performance feedback mechanism to adapt to different water flow intensities, channel openings, and blocking targets, forming six preferred implementation methods. It can adapt to typical engineering requirements such as rapid blocking, stable sedimentation, medium-speed locking, long-distance diffusion, low-permeability barrier, and strong scour comprehensive blocking, and has wide engineering applicability. 6. The preferred embodiment of the present invention yielded a flowability of 175 mm, an initial setting time of 52 min, a turbidity of 120 NTU, a 28-day strength of 14.17 MPa, and a permeability coefficient of 1.02 × 10⁻⁶. -10 A solid waste slurry material with a flow rate of m / s meets the requirements for sealing by strong scouring of dynamic water. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the process for the phased synergistic anti-dispersion control method of all solid waste slurry under dynamic water flushing according to the present invention; Figure 2 This is a schematic diagram of the four-stage control logic of the present invention: pumping diffusion, water inlet anti-dialysis, retention locking, and hardening hypopermeability. Figure 3 This is a schematic diagram illustrating the synergistic relationship between the four control mechanisms of dispersion and flow retention, water binding and anti-segregation, coagulation and locking, and defoaming and densification in this invention. Figure 4 This is a schematic diagram showing the proportioning gradient of admixtures in six preferred embodiments of the present invention; Figure 5 This is a schematic diagram showing the slurry fluidity, setting time, and underwater turbidity results of Examples 1-6 of the present invention; Figure 6 This is a schematic diagram showing the compressive strength and permeability coefficient results of the hardened bodies in Examples 1-6 of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings. Figures 1-6 The technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0019] like Figures 1-3 As shown, this invention provides a staged synergistic anti-dispersion control method for all solid waste slurry under dynamic water flushing, comprising the following steps: Step S1: Identify the dynamic water scouring conditions and sealing targets of the area to be grouted; the dynamic water scouring conditions and sealing targets include the intensity of water flow disturbance, the opening of the leakage channel, the connectivity of the channel, the target diffusion distance, the allowable locking time, and the low permeability requirements after sealing; based on the dynamic water scouring conditions and sealing targets, six implementation methods are formed to adapt to different working conditions: extremely low turbidity rapid coagulation sealing implementation method, low turbidity stable deposition implementation method, medium-speed locking and anti-dispersion implementation method, flow-preserving and anti-scouring diffusion implementation method, high flocculation and low permeability sealing implementation method, and strong scouring comprehensive implementation method; Step S2: The process of grout action in dynamic water grouting is divided into pumping and diffusion stage, water ingress and anti-segregation stage, residence and locking stage and hardening and low permeability stage; Step S3: Establish performance control requirements for the pumping diffusion stage, the influent anti-dialysis stage, the retention and locking stage, and the hardening and low-permeability stage. Specifically, for the pumping diffusion stage, fluidity is the primary control indicator, with a slurry fluidity of 130-220 mm; for the influent anti-dialysis stage, underwater turbidity is the primary control indicator, not exceeding 150 NTU; for the retention and locking stage, setting time is the primary control indicator, with an initial setting time not exceeding 60 min under strong scouring and rapid locking conditions; and for the hardening and low-permeability stage, compressive strength and permeability coefficient are the primary control indicators, with a 28-day compressive strength not less than 7 MPa and a 28-day permeability coefficient not exceeding 1 × 10⁻⁶ MPa. -9 m / s; Step S4: Construct a solid waste cementitious matrix using blast furnace slag, red mud, carbide slag, and fly ash, and mix it with water to form a basic slurry; based on 100 parts by weight of the solid waste cementitious matrix, the mass parts of each component are: 30-60 parts blast furnace slag, 10-30 parts red mud, 20-30 parts carbide slag, 10-30 parts fly ash, and 50-70 parts water; Step S5: The base slurry is sequentially subjected to dispersion and flow retention regulation, water-binding and anti-segregation regulation, coagulation-promoting and locking regulation, and defoaming and densification regulation. The key to this invention is that the method of using admixtures is changed from simple material addition to staged regulation. The four regulation links are carried out in sequence according to the action of the slurry in the dynamic water environment, and they compensate for each other in the performance feedback. (1) Dispersion and flow control: Polycarboxylate superplasticizer is preferred in this control step. Its function is to improve the dispersion state of solid particles in the solid waste slurry, release the water bound in the aggregate structure, and maintain the pumping fluidity and crack diffusion ability of the slurry without increasing the water consumption. This step mainly solves the problem of decreased fluidity of the slurry after the introduction of anti-dispersion components and coagulation-promoting components. (2) Water binding and anti-segregation regulation: Hydroxypropyl methylcellulose is preferred for this regulation step. Its function is to form molecular chain bridging, physical entanglement and hydrogen bond water binding in the aqueous phase, converting some free water into bound water, improving the integrity of the slurry after entering the water, and inhibiting particle migration, slurry segregation and water turbidity. This step mainly solves the problems of slurry being diluted, dispersed and particles being carried away after entering the moving water. (3) Coagulation and Lock-in Regulation: This regulation step is preferably composed of a mixture of liquid aluminum oxide clinker coagulant and solid aluminum sulfate coagulant. Its function is to shorten the time for the slurry to transform from a fluid state to an agglomerated sedimentary state and a gel state, so that the slurry can form an anti-scouring boundary and an early stable sedimentation nucleus as soon as possible under the disturbance of water flow. This step mainly solves the problem that although the slurry can resist precipitation, the retention and locking is lagging. (4) Defoaming and densification control: Polyether defoamers are preferred in this control step. Their function is to reduce the bubble defects generated during mixing, pumping and rapid coagulation, weaken the internal interconnected pores of the hardened body, and improve the low permeability performance of the sealing body together with the gel filling effect. This step mainly solves the problems of residual seepage channels after hardening and insufficient continuity of the sealing body. Based on 100 parts of solid waste gel matrix, the mass parts of each admixture are as follows: 0.6-1.2 parts of polycarboxylate superplasticizer, 0.3-0.4 parts of hydroxypropyl methylcellulose, 10 parts of liquid aluminum oxide clinker accelerator, 4-8 parts of solid aluminum sulfate accelerator, and 0.1-0.4 parts of polyether defoamer; Step S6: Based on the test results of slurry fluidity, underwater turbidity, setting time, compressive strength, and permeability coefficient, feedback corrections are made to the above-mentioned dispersion and flow retention control, water binding and anti-segregation control, coagulation and locking control, and defoaming and densification control. Feedback corrections include: (1) When the fluidity is below the target range, prioritize increasing the dosage of polycarboxylate superplasticizer instead of increasing the water consumption; (2) When the underwater turbidity is higher than the target range, increase the amount of hydroxypropyl methylcellulose and simultaneously increase the coagulation and lock-in control level; (3) When the initial setting time exceeds the allowable locking time, increase the proportion of solid aluminum sulfate accelerator; (4) When the permeability coefficient of the hardened body is higher than the target range, the polyether defoamer should be controlled at 0.2-0.4 parts, and the coagulation and locking control should be kept at a medium-high level.

[0020] Grout that meets the performance control requirements at each stage is used for grouting and sealing in dynamic water scouring environments; specific application scenarios include: underground engineering grouting, karst channel filling, fractured rock mass reinforcement, goaf treatment, landfill anti-seepage curtain, groundwater leakage channel sealing, and underwater void area reinforcement.

[0021] The present invention will be further described in detail below with reference to specific embodiments.

[0022] (I) Preparation of the base slurry for a solid waste gel matrix: The all-solid-waste cementitious matrix is ​​composed of blast furnace slag, red mud, calcium carbide slag, and fly ash. The components of the all-solid-waste cementitious matrix are as follows: 100 parts by weight of the matrix, 36 parts blast furnace slag, 24 parts red mud, 30 parts calcium carbide slag, 10 parts fly ash, and 60 parts water. This basic slurry, through the potential hydraulic activity of blast furnace slag, the alumina-silica components and alkaline ionic environment of red mud, the calcium source and alkaline activation effect of calcium carbide slag, and the particle size distribution and post-reaction effect of fly ash, provides a foundation for subsequent anti-dispersion regulation and low-permeability sealing.

[0023] In this embodiment, the basic slurry can be prepared according to the following steps: First, blast furnace slag, red mud, carbide slag, fly ash, and powdered additives (solid aluminum sulfate coagulant, hydroxypropyl methylcellulose, etc.) are dry-mixed evenly in proportion; second, liquid alumina clinker coagulant and liquid additives (polycarboxylate superplasticizer, polyether defoamer) are added to the mixing water and dispersed evenly to form a liquid phase mixture; then, the liquid phase mixture is added to the solid dry mixture and stirred to obtain a uniform all-solid waste slurry; no additional liquid water glass or strong alkali activator is added during the preparation process.

[0024] The effectiveness of basic slurry regulation was verified by fluidity, setting time, underwater turbidity, compressive strength, and permeability coefficient. Fluidity was used to evaluate pumping diffusion capacity, underwater turbidity was used to evaluate influent anti-segregation capacity, setting time was used to evaluate retention and locking capacity, and compressive strength and permeability coefficient were used to evaluate hardening low-permeability plugging capacity.

[0025] (II) Component proportions of the six preferred embodiments: To make this invention applicable to different dynamic water conditions, this embodiment sets up six preferred implementation methods: extremely low turbidity rapid coagulation and plugging, low turbidity stable sedimentation, medium speed locking and anti-dispersion, flow retention and anti-scouring diffusion, high flocculation and low permeability plugging, and strong scouring comprehensive optimization. Each embodiment uses 36 parts of blast furnace slag, 24 parts of red mud, 30 parts of calcium carbide slag, 10 parts of fly ash, and 60 parts of water as the base slurry. The difference lies in the different additive components in the four stages of dispersion and flow retention regulation, water binding and anti-segregation regulation, coagulation and locking regulation, and defoaming and densification regulation (as shown in Table 1).

[0026] Table 1. Distribution ratio of admixture components (parts by mass) in six preferred embodiments: .

[0027] Example 1 is an implementation method for rapid coagulation and plugging in extremely low turbidity conditions. This implementation method uses a combination of strong water-binding and anti-dialysis, strong coagulation and locking, and strong defoaming and compaction, which can quickly form cohesive boundaries and early stable sediments in flowing water. It is suitable for scenarios with large channel openings, significant water flow scouring, and requirements for rapid plugging.

[0028] Example 2 is a low-turbidity stable sedimentation implementation method; this implementation method adopts a combination of strong water-binding anti-dialysis and low coagulation-locking, which can maintain low turbidity while retaining a long operating time, and is suitable for scenarios with obvious water flow disturbance but allow for a long sedimentation window.

[0029] Example 3 is a medium-speed locking and anti-dispersion implementation method; this implementation method adopts a combination of medium water flow anti-separation and medium-high coagulation locking, which is suitable for scenarios with moderate water flow disturbance, moderate diffusion distance and the need for stable sedimentation boundary.

[0030] Example 4 is an implementation method for flow retention and anti-scouring diffusion; this implementation method adopts a combination of high dispersion flow retention and medium water binding anti-segregation, which can take into account both good diffusion ability and underwater anti-segregation ability, and is suitable for dynamic water environments with complex fracture networks, long grouting paths or large diffusion radii.

[0031] Example 5 is a high-flocculation, low-permeability plugging implementation method. This implementation method adopts a combination of high dispersion and flow retention and strong water binding and anti-segregation, and is configured with medium-high coagulation and locking and medium defoaming and compaction. It is suitable for plugging projects that emphasize anti-dispersion and long-term low-permeability barrier.

[0032] Example 6 is a comprehensive implementation method for strong scouring; this implementation method adopts a combination of high dispersion and flow retention, strong coagulation and locking, moderate water binding and anti-segregation, and moderate defoaming and compaction, forming a comprehensive balance between pumping diffusion, water inlet anti-segregation, rapid locking and hardening low permeability, and is suitable for strong scouring dynamic water sealing projects.

[0033] (III) Test results of slurry properties in each embodiment: The slurry performance test results of Examples 1-6 are shown in Table 2.

[0034] Table 2. Test results of slurry properties for Examples 1-6: .

[0035] As shown in Table 2, the slurries prepared in Examples 1-6 all meet the requirements of underwater turbidity not exceeding 150 NTU, 28-day compressive strength not less than 7 MPa, and 28-day permeability coefficient not exceeding 1 × 10⁻⁶. -9 The requirements are as follows: Examples 1 and 2 exhibit low underwater turbidity, suitable for scenarios emphasizing anti-segregation in the influent; Example 4 exhibits high fluidity, suitable for scenarios emphasizing diffusion radius; Example 6 shows good performance in fluidity (175 mm), initial setting time (52 min), underwater turbidity (120 NTU), 28-day compressive strength (14.17 MPa), and 28-day permeability coefficient (1.02 × 10⁻⁶ m / s). -10 It performs excellently in terms of m / s, achieving the best overall balance of various performances, and is suitable as a comprehensive implementation method for strong scouring.

[0036] The above results demonstrate that the control method of the present invention can achieve differentiated performance of slurry under different engineering objectives through the combination of different control links, rather than relying on a single fixed ratio to cope with all dynamic water conditions.

[0037] (iv) Overall structural formation effect of the preferred implementation method: In the comprehensive preferred embodiment (Example 6), dispersion and flow control maintain the slurry flowability at 175 mm, water-binding and anti-segregation control keeps the underwater turbidity at 120 NTU, coagulation-promoting and locking control shortens the initial setting time to 52 min, and defoaming and compaction control, together with gel filling effect, reduces the 28-day permeability coefficient to 1.02 × 10⁻⁶. -10 m / s. This implementation method shows that the improvement in slurry performance does not come from the action of a single component, but from the progressive synergistic effect of four types of control links: dispersion and flow retention, water binding and anti-segregation, coagulation and locking, and defoaming and densification.

[0038] Regarding the hardened structure, Example 6 can promote the dissolution of reaction precursors and the formation of gel products, resulting in a more continuous C-(A)-SH type gel network in the hardened body; the pore structure is characterized by a more concentrated pore size distribution, reduced interconnected pores and through-flow channels; a more stable adsorption and coating structure is formed on the particle surface, giving the slurry a strong anti-dialysis ability in the early stage of water introduction, and forming a better low-permeability sealing structure after hardening.

[0039] (V) On-site application methods: In field applications, the dynamic water flushing conditions and sealing targets should first be determined based on the intensity of water flow disturbance, channel opening, target diffusion distance, allowable locking time, and post-sealing low permeability requirements. Accordingly, the appropriate implementation method should be selected, or adjustments should be made between adjacent implementation methods. For projects with significant water inflow, large channel opening, and a requirement for rapid formation of the sealing core, the implementation methods of Example 1 or Example 6 are recommended. For projects with significant water flow disturbance but allowing for a longer deposition window, the implementation methods of Example 2 or Example 5 are recommended. For projects with moderate water flow disturbance and requiring consideration of both anti-dispersion and construction window, the implementation method of Example 3 is recommended. For projects with complex fracture networks and requiring a longer diffusion radius, the implementation method of Example 4 is recommended.

[0040] A segmented control strategy can be adopted during grouting. In the first stage, a flow-preserving and diffusion-type grout (such as in Example 4) is used for pre-filling, allowing the grout to enter the main channel and surrounding voids. In the second stage, the water-binding and anti-segregation and coagulation-promoting locking levels are improved (such as in Example 3 or Example 6), allowing the grout to form stable deposition nuclei in the flowing water. In the third stage, a low-permeability and dense-type grout (such as in Example 5) is used for sealing and reinforcement, further reducing the permeability of the formed filling body and improving its continuous barrier capacity.

[0041] When on-site testing reveals high turbidity of the slurry after water introduction, the dosage of hydroxypropyl methylcellulose can be adjusted to 0.3-0.4 parts, and the dosage of solid aluminum sulfate coagulant can be increased. When slurry pumping is difficult or diffusion is insufficient, the dosage of polycarboxylate superplasticizer can be adjusted to 1.0-1.2 parts, while avoiding blindly increasing water consumption. When coagulation and locking are insufficient, the coagulation and locking control can be increased to 16-18 parts. When the permeability coefficient of the hardened body is high, the polyether defoamer can be controlled within the range of 0.2-0.4 parts, and the coagulation and locking control can be maintained at a medium-high level.

[0042] The above embodiments are merely preferred embodiments of the present invention, used to illustrate the implementation path and technical effects of the phased synergistic anti-dispersion control method for all solid waste slurry under dynamic water flushing, and are not intended to limit the scope of protection of the present invention. All equivalent substitutions, parameter adjustments, combination optimizations, or engineering adaptations made based on the four-stage division of pumping diffusion-injection anti-dialysis-retention locking-hardening low-permeability and the four progressive control methods of dispersion and flow retention-water binding anti-dialysis-coagulation locking-defoaming and densification proposed in this invention should be included within the scope of protection of this invention.

Claims

1. A method for staged synergistic anti-dispersion control of solid waste slurry under dynamic water flushing, characterized in that, Includes the following steps: Step S1: Identify the dynamic water scouring conditions and sealing targets in the area to be grouted; The dynamic water flushing conditions and sealing targets include the intensity of water flow disturbance, the opening of the leakage channel, the connectivity of the channel, the target diffusion distance, the allowable locking time, and the low permeability requirements after sealing; Step S2: The process of grout action in dynamic water grouting is divided into pumping and diffusion stage, water ingress and anti-segregation stage, residence and locking stage and hardening and low permeability stage; Step S3: Establish performance control requirements for the pumping diffusion stage, the influent anti-dialysis stage, the retention and locking stage, and the hardening and low permeability stage, respectively; Step S4: Construct a solid waste cementitious matrix using blast furnace slag, red mud, carbide slag and fly ash, and mix it with water to form a basic slurry; Step S5: The basic slurry is subjected to dispersion and flow retention regulation, water binding and anti-segregation regulation, coagulation and locking regulation, and defoaming and densification regulation in sequence; Step S6: Based on the test results of slurry fluidity, underwater turbidity, setting time, compressive strength and permeability coefficient, feedback corrections are made to the dispersion and flow retention control, water binding and anti-segregation control, coagulation and locking control and defoaming and densification control. Grouting that meets the performance control requirements at each stage is used for grouting and sealing under dynamic water scouring conditions; wherein, the feedback correction includes: (1) When the fluidity is below the target range, prioritize increasing the dosage of polycarboxylate superplasticizer instead of increasing the water consumption; (2) When the underwater turbidity is higher than the target range, increase the amount of hydroxypropyl methylcellulose and simultaneously increase the coagulation and lock-in control level; (3) When the initial setting time exceeds the allowable locking time, increase the proportion of solid aluminum sulfate accelerator; (4) When the permeability coefficient of the hardened body is higher than the target range, the polyether defoamer should be controlled at 0.2-0.4 parts, and the coagulation and locking control should be kept at a medium-high level.

2. The method for staged synergistic anti-dispersion control of solid waste slurry under dynamic water flushing according to claim 1, characterized in that, In step S3, the pumping diffusion stage uses fluidity as the main control index, with a slurry fluidity of 130-220 mm; the water inlet anti-segregation stage uses underwater turbidity as the main control index, with underwater turbidity not exceeding 150 NTU; the residence lock-in stage uses setting time as the main control index, with an initial setting time not exceeding 60 min under strong scouring and rapid lock-in conditions; and the hardening and low permeability stage uses compressive strength and permeability coefficient as the main control indexes, with a 28-day compressive strength not less than 7 MPa and a 28-day permeability coefficient not greater than 1 × 10⁻⁶. -9 m / s.

3. The method for staged synergistic anti-dispersion control of solid waste slurry under dynamic water flushing as described in claim 1, characterized in that, In step S5, the dispersion and flow control uses a polycarboxylate superplasticizer to improve the particle dispersion state of the solid waste slurry and restore the pumping fluidity and crack diffusion capacity of the slurry without increasing the water consumption; the water binding and anti-segregation control uses hydroxypropyl methylcellulose; the coagulation and locking control is composed of a liquid aluminum oxide clinker coagulant and a solid aluminum sulfate coagulant; and the defoaming and densification control uses a polyether defoamer.

4. The method for staged synergistic anti-dispersion control of solid waste slurry under dynamic water flushing according to claim 1, characterized in that, In step S4, based on 100 parts of the total solid waste cementitious matrix, the mass parts of each component are: 30-60 parts of blast furnace slag, 10-30 parts of red mud, 20-30 parts of calcium carbide slag, 10-30 parts of fly ash, and 50-70 parts of water.

5. The method for staged synergistic anti-dispersion control of solid waste slurry under dynamic water flushing according to claim 4, characterized in that, The mass fractions of each component in the all-solid waste cementitious matrix are: 36 parts blast furnace slag, 24 parts red mud, 30 parts calcium carbide slag, and 10 parts fly ash. Water is 60 parts.

6. The method for staged synergistic anti-dispersion control of solid waste slurry under dynamic water flushing according to any one of claims 1-5, characterized in that, Based on 100 parts of solid waste gel matrix, the mass parts of each admixture are as follows: 0.6-1.2 parts of polycarboxylate superplasticizer, 0.3-0.4 parts of hydroxypropyl methylcellulose, 10 parts of liquid aluminum oxide clinker accelerator, 4-8 parts of solid aluminum sulfate accelerator, and 0.1-0.4 parts of polyether defoamer.

7. The method for staged synergistic anti-dispersion control of solid waste slurry under dynamic water flushing according to claim 1, characterized in that, Based on the dynamic water flushing conditions and the plugging objectives, six implementation methods are formulated to adapt to different working conditions: extremely low turbidity rapid coagulation plugging implementation method, low turbidity stable sedimentation implementation method, medium-speed locking and anti-dispersion implementation method, flow preservation and anti-scouring diffusion implementation method, high flocculation and low permeability plugging implementation method, and strong scouring comprehensive implementation method.

8. The method for staged synergistic anti-dispersion control of solid waste slurry under dynamic water flushing according to claim 7, characterized in that, The comprehensive implementation method of strong scouring is based on 100 parts of solid waste gel matrix: 1.2 parts of polycarboxylate superplasticizer, 0.3 parts of hydroxypropyl methylcellulose, 10 parts of liquid aluminum oxide clinker accelerator, 8 parts of solid aluminum sulfate accelerator, and 0.2 parts of polyether defoamer.

9. The method for staged synergistic anti-dispersion control of solid waste slurry under dynamic water flushing according to claim 1, characterized in that, The application scenarios of the method include: underground engineering grouting, karst channel filling, fractured rock mass reinforcement, goaf treatment, landfill anti-seepage curtain, groundwater leakage channel sealing, and underwater void area reinforcement.

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