Composite hydrogel grouting material for water inrush plugging as well as preparation method and application of composite hydrogel grouting material

Abstract

The invention discloses a composite hydrogel grouting material for water inrush plugging as well as a preparation method and application of the composite hydrogel grouting material. The preparation method comprises the following steps: magnetically stirring [2-(methylacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide (SBMA), an acrylamide (AM) monomer, a photoinitiator, a cross-linking agent and a solvent at room temperature until the materials are fully dissolved, then adding a cement-based material, and stirring to form a uniform solution; introducing nitrogen to remove oxygen; and carrying out illumination polymerization on the precursor solution by adopting an ultraviolet light and cross-linking mode. The hydrogel is prepared through copolymerization of SBMA and AM which have an anti-polyelectrolyte effect, the hydrogel has high expansibility under a high-salt condition, and the swelling rate of the hydrogel in high-concentration saline water reaches 92.69 g / g; by compounding the hydrogel and the cement-based material, the expansibility of the hydrogel in a low-salt environment is improved, and the maximum swelling rate in a low-concentration salt solution can reach 126-260 g / g.

Description

Technical Field

[0001] This invention pertains to grouting materials for plugging leaks, their preparation methods and applications, specifically a composite hydrogel grouting material for plugging leaks caused by sudden water inrush, its preparation method and application. Background Technology

[0002] Tunnel construction in areas with poor geological structures is highly susceptible to severe water-related disasters. Sudden water inrushes are typically characterized by high water pressure, rapid flow, and large volume. If not stopped promptly, they can lead to tunnel instability and collapse, posing a significant threat to the lives of construction workers and potentially causing ground subsidence and the drying up of surface water. Furthermore, with increasingly complex construction site conditions and diverse geological types, the quality of inrush water varies significantly. Inrush water in water-rich faults is primarily composed of groundwater, while inrush water in karst areas mainly contains divalent salts, typically at low concentrations. In contrast, inrush water in submarine tunnels contains both monovalent and divalent salts at higher concentrations. This necessitates the development of water-stopping materials applicable to various situations. Existing sealing materials are generally classified into inorganic and organic categories. Among inorganic materials, cement-based sealing materials are commonly used, typically composed of a mixture of cement and modified materials such as water glass and clay.

[0003] However, traditional inorganic sealing materials (such as ordinary Portland cement, OPC) have large particle sizes, making it difficult to seal small cracks. Furthermore, due to the high solubility of cement-based materials in aqueous solutions, even after modification, they are easily dispersed by water flow in high-pressure, high-flow-rate environments. Even fast-setting cement-based materials exhibit insufficient curing speed and poor erosion resistance in the face of high-velocity flooding. While water glass-modified cement-based sealing materials can significantly accelerate the setting of cement-based materials, the addition of water glass is detrimental to the later-stage strength development of these materials.

[0004] Commonly used raw materials for organic sealing materials include polyurethane, epoxy resin, and polyacrylamide. Chinese patent CN117165239A discloses a polyurethane repair capsule system and construction method for sealing leaks caused by tunnel flooding. This method requires preparing polyurethane magnetic grout capsules and inserting magnetic rods into the corresponding leak points to attract the capsules. The process is complex, and polyurethane raw materials are difficult to obtain, resulting in high costs. Furthermore, these organic materials have some shortcomings in use. Water-based polyurethane materials are easily diluted and washed away in water, thus losing their sealing effect; while oil-based polyurethane materials have poor injectability due to their high viscosity and require a long curing time at low temperatures. In addition, these chemical grouting materials generally have a certain degree of toxicity, which to some extent harms the surrounding environment and human health.

[0005] Organic superabsorbent hydrogels are a class of materials that can swell dramatically in water. Recently, they have been applied to sealing groundwater faults, using expansion to absorb water and seal narrow gaps that allow water inrush, thus mitigating such disasters. Chinese patent CN120040163A provides a grouting material suitable for rapid sealing in water-rich strata, its preparation method, and its application. This is primarily applied to water-rich strata and does not cover karst areas or other high-salt environments such as submarine tunnels. Furthermore, the water absorption and swelling principle of existing superabsorbent hydrogels involves using a single-charged polyelectrolyte (such as commonly used polyacrylic acid (PAA)-based hydrogel) as the framework of the hydrogel material. In pure water, this ionizes into functional groups carrying the same charge. Therefore, when immersed in an aqueous solution, adjacent segments in the polymer framework carry the same charge, generating electrostatic repulsion, and thus expanding and absorbing water. In high-concentration salt water, salt ions with opposite charges strongly adsorb around the charged functional groups, shielding the electrostatic repulsion between the polymer backbone. As a result, the expansion capacity is greatly reduced, and the hydrogel may even shrink due to the higher osmotic pressure in the salt water relative to the inside of the hydrogel. This greatly limits the application of hydrogels with single-electrolyte charge in the treatment of groundwater inrush hazards with high salt concentration.

[0006] Compared to monoelectrolyte hydrogels, zwitterionic hydrogels, when immersed in high-concentration saline solutions, exhibit salt ion adsorption around zwitterionic pairs. This leads to the opening of dipole-dipole interlocking interactions between the ion pairs, causing the hydrogel framework to expand and the hydrogel to swell. This high-salt expansion property makes it a promising candidate for sealing in cases of high-salt water inrush. However, this material expands slowly in low-salt water bodies and may even shrink. Therefore, the development of a simple-to-use, versatile, and expansion-promoting sealing material suitable for tunnel water inrush disasters is urgently needed. Summary of the Invention

[0007] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the purpose of this invention is to provide a method for preparing a non-toxic, environmentally friendly, and inexpensive composite hydrogel grouting material for plugging leaks caused by sudden water inrush. Another purpose of this invention is to provide a composite hydrogel grouting material for plugging leaks caused by sudden water inrush with high swelling rate, good compression resistance, fast water absorption rate, and good salt resistance. A further purpose of this invention is to provide an application of the composite hydrogel grouting material in high-salt and low-salt environments.

[0008] Technical solution: The present invention provides a method for preparing a composite hydrogel grouting material for plugging sudden water leaks, comprising the following steps:

[0009] Step 1: [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonylpropyl)ammonium hydroxide (SBMA), acrylamide monomer (AM), crosslinking agent, photoinitiator, and solvent are fully dissolved by magnetic stirring at room temperature, and then cement-based materials are added and stirred to form a homogeneous solution;

[0010] Step two: Introduce nitrogen gas to expel oxygen;

[0011] Step 3: The precursor solution is photopolymerized using ultraviolet light and cross-linking to form a composite hydrogel grouting material.

[0012] Furthermore, in step one, the mass ratio of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonylpropyl)ammonium hydroxide, acrylamide monomer, solvent, and cement-based material is 2~6:3~9:40~60:1~7.

[0013] To achieve a better swelling ratio, in step one, the mass ratio of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonylpropyl)ammonium hydroxide to acrylamide monomer is 4~6:6~4.

[0014] Further, in step one, the crosslinking agent is poly(ethylene glycol) ethyl acrylate with a molecular weight of 2000~5000, and the amount used is 0.006~0.009 mol of the total amount of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonylpropyl)ammonium hydroxide and acrylamide monomer.

[0015] Further, in step one, the photoinitiator is one or more of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylacetone, and 4-methylbenzophenone, and the amount used is 0.1~0.4 mol of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonylpropyl)ammonium hydroxide and acrylamide monomer.

[0016] Furthermore, in step one, the cement-based material is one or more of ordinary silicate cement, sulfoaluminate cement, and composite silicate cement, and passes through a 200-mesh sieve. The solvent is deionized water.

[0017] Furthermore, in step two, the nitrogen gas is introduced for at least 15 minutes.

[0018] Furthermore, in step three, the ultraviolet light irradiation time for crosslinking polymerization is 2-4 hours.

[0019] The composite hydrogel grouting material prepared by the method described in this invention for plugging water leaks is a composite hydrogel grouting material.

[0020] The present invention relates to the application of the composite hydrogel grouting material in water-rich, high-salt, and low-salt environments. The low-salt environment is defined as NaCl ≤ 300 mg / L, CaCl2 ≤ 600 mg / L, and MgCl2 ≤ 400 mg / L. The high-salt environment is defined as NaCl solution ≥ 35 g / L and CaCl2 solution ≥ 10 g / L.

[0021] Preparation principle: Utilizing the anti-polyelectrolyte effect, zwitterionic monomers [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (SBMA) and acrylamide monomer (AM) were copolymerized. Poly(ethylene glycol) ethyl acrylate (PEGDA) with different molecular weights was used as a crosslinking agent. Polymerization was initiated by ultraviolet light to prepare poly((2-(methacryloyloxy)ethyl)dimethyl-(3-sulfopropyl)ammonium hydroxide-co-acrylamide) (P(SBMA-co-AM)) hydrogel. The zwitterionic groups in this hydrogel simultaneously possess positively charged -N(CH3)2 groups. + and the negatively charged group -SO3 - In pure water, a pair of zwitterions can be interlocked together through dipole-dipole interactions between positively and negatively charged groups. When immersed in a salt solution, the counterion salt ions are strongly adsorbed around the charged groups, causing the interlocked ion pairs to open, which macroscopically manifests as water absorption and swelling of the hydrogel network. Furthermore, by changing the ratio of zwitterionic SBMA and monomer AM, as well as the molecular weight of the crosslinking agent PEGDA, the swelling properties of the hydrogel can be further controlled, optimizing the swelling ratio and swelling rate in high-salt-concentration solutions.

[0022] Due to the interlocking of zwitterions under pure water conditions, zwitterionic-based P(SBMA-co-AM) hydrogels have poor swelling properties in pure water. Cement particles are added to the above-mentioned hydrogel precursor to obtain a composite hydrogel grouting material. The salt ions released by the dissolution of cement particles are used for endogenous ion supply, opening the interlocking ion pairs of zwitterions. At the same time, the osmotic pressure inside the hydrogel network is higher than that of deionized water, thereby improving the swelling rate of the composite hydrogel in a low-salt environment.

[0023] Beneficial effects: Compared with the prior art, the present invention has the following significant features:

[0024] 1. By utilizing the anti-polyelectrolyte effect, zwitterionic hydrogels were prepared by copolymerizing zwitterionic SBMA with AM, which has both positive and negative groups. These zwitterionic hydrogels exhibit "salt-induced swelling" by expanding instead of shrinking in high-salt aqueous solutions.

[0025] 2. Free radical polymerization initiated by ultraviolet light was carried out for 1-2 hours. The resulting gel had a swelling ratio of 92.69 g / g in 35 g / L NaCl and 82.37 g / g in 10 g / L CaCl2. Compared with the swelling performance of pure PAA hydrogel in the corresponding solutions, the swelling ratio of zwitterionic hydrogel was increased by 1317.8% and 4181.2%, respectively.

[0026] 3. By supplying salt ions from within the hydrogel network through composite cement-based materials, the expansion rate and overall expansion speed of zwitterionic hydrogels are significantly improved in pure water and low-salt environments. The expansion rate is increased by ~1000% in pure water environments and by 144%~372% in low-concentration salt solutions. This composite hydrogel grouting material has shown broad application potential in various sudden water inrush scenarios, including fresh water, seawater, and karst areas containing groundwater with a wide range of ion concentrations. Attached Figure Description

[0027] Figure 1 These are the infrared spectra of the monomer and hydrogel of this invention;

[0028] Figure 2 This is the infrared spectrum of the cement-based hydrogel composite material of the present invention;

[0029] Figure 3 This represents the swelling ratio of the zwitterionic hydrogel of the present invention, where a represents different solutions and b represents NaCl solutions of different concentrations.

[0030] Figure 4 It is the swelling ratio of the cement-based hydrogel composite material of the present invention, where a represents different contents of OPC; b represents different solutions. Detailed Implementation

[0031] Unless otherwise specified, all materials and reagents used in the following embodiments are commercially available. Experimental methods not specifically described in the embodiments are generally performed under standard conditions or as recommended by the manufacturer.

[0032] Example 1

[0033] A method for preparing a composite hydrogel grouting material for plugging sudden water leaks includes the following steps:

[0034] (1) Weigh 6 parts SBMA, 14 parts AM, photoinitiator 4-methylbenzophenone and crosslinking agent PEGDA into a 20 ml transparent glass bottle. The amount of photoinitiator is 0.25 mol of the total amount of SBMA and AM, and the amount of PEGDA is 0.0085 mol of the total amount.

[0035] (2) Add 74 parts of deionized water and 57.9 parts of cement particles passing through a 200-mesh sieve OPC and dissolve them evenly. Then, stir magnetically at room temperature until completely dissolved.

[0036] (3) Purge nitrogen gas into the glass bottle for 20 min to remove dissolved oxygen from the system. Finally, place the precursor in a 365 nm UV curing chamber and irradiate with ultraviolet light for 2 h.

[0037] (4) Remove the hydrogel after light exposure to obtain zwitterionic hydrogel injection material.

[0038] Table 1 Ingredients for Examples 2-6 and Comparative Example 1

[0039]

[0040] Examples 2-6

[0041] By changing the proportions of SBMA and AM, zwitterionic hydrogels with different solid contents can be prepared.

[0042] The remaining steps of Examples 2-6 are the same as those of Example 1, except that the proportions of SBMA, AM, and deionized water are replaced with the ratios in Table 1.

[0043] Comparative Example 1

[0044] The remaining steps of this comparative example are the same as those of Example 1, except that the proportions of SBMA, AM, and deionized water are replaced with the ratios in Table 1.

[0045] FTIR measurements were performed on SBMA, AM, and Example 4, as shown below. Figure 1 As shown, there is a significant difference between Example 4 and the monomer. In Example 4, the spectrum of hydrogel P (SBMA-co-AM) was analyzed, and it was observed that at approximately ~1040 cm⁻¹... -1 The Treaty of Peace ~ 1183 cm -1 It has a characteristic S=O peak, and the peak position has shifted; at the same time, the characteristic peak of the C=C bond of the monomer at 1612 cm⁻¹ was not observed, which indicates that an addition reaction occurred during the polymerization process, turning it into a saturated C=C bond, indicating that the monomer polymerized into P(SBMA-co-AM) hydrogel.

[0046] Example 7

[0047] A method for preparing a composite hydrogel grouting material for plugging sudden water leaks includes the following steps:

[0048] (1) Weigh 16 parts SBMA, 24 parts AM, photoinitiator 4-methylbenzophenone and crosslinking agent PEGDA into a 20 ml transparent glass bottle. The amount of photoinitiator is 0.25 mol of the total amount of SBMA and AM monomers, and the amount of crosslinking agent is 0.0085 mol of the monomer amount.

[0049] (2) Add 166.7 parts of deionized water and dissolve evenly, then stir magnetically at room temperature until completely dissolved.

[0050] (3) Add 37.9 parts of OPC cement particles that have passed through a 200-mesh sieve to the glass bottle.

[0051] (4) Nitrogen gas was introduced into the glass bottle for 20 min to remove dissolved oxygen in the system. The precursor was placed in a 365 nm UV curing box and irradiated with ultraviolet light for 2 h to obtain the composite hydrogel grouting material.

[0052] Examples 8-21

[0053] By changing the amount and type of composite cement, cement composite hydrogels with different degrees of compositeness can be prepared. The specific amounts are shown in Table 2, and the remaining steps are the same as in Example 7.

[0054] Comparative Example 2

[0055] The remaining steps of this comparative example are the same as those of Example 7, except that the cement mass fraction is changed according to Table 2.

[0056] Table 2 Ingredients for Examples 10-12 and Comparative Example 2

[0057]

[0058] FTIR measurements were performed on the zwitterionic hydrogels and in Examples 9, 14, and 19. Figure 2 As shown, compared to the zwitterionic hydrogel S4A6 (without cement particles), the characteristic absorption peaks of functional groups such as CN, C=O, S=O, -NH, CH, and -NH2 still exist and remain at a high intensity after being incorporating cement particles. This indicates that the addition of cement did not change the functional group or chemical bond structure of the hydrogel, and the polymerization reaction of the hydrogel still proceeded successfully. Further analysis revealed that, compared to the pure organic hydrogel S4A6, the symmetric tensile vibration peak of the S=O sulfonic acid group in the three composite hydrogels containing 6 wt.% cement shifted from 1036.45 cm⁻¹ to 1038.48 cm⁻¹, and the vibration peak of the quaternary ammonium salt group shifted from 2933.20 cm⁻¹ to 2935.38 cm⁻¹. This is because the ions released by the cement have generated new interactions with the zwitterions in the pure S4A6 hydrogel, thus disrupting the interlocking interactions between their ion pairs.

[0059] Performance testing

[0060] A. The swelling effect of the zwitterionic hydrogels prepared in Examples 3-6 was tested. The zwitterionic hydrogels were cut into small blocks and immersed in deionized water and salt solutions of different concentrations for different times. After immersion, the blocks were removed, the surface moisture was carefully wiped dry, and the mass was recorded until the equilibrium mass of the hydrogel no longer changed after absorbing water. The swelling rate of the zwitterionic hydrogels in deionized water and salt solutions of different concentrations was obtained. Figure 3 As shown, in various solutions, the NaCl solution concentration was 35 g / L, at which point the hydrogels of different proportions exhibited the highest swelling capacity, while the swelling rate was lowest in deionized water. Furthermore, as the SBMA content decreased, the zwitterionic hydrogels showed a trend of increasing and then decreasing swelling rates in different salt solutions and deionized water. The S5A5 hydrogel had the highest swelling rate in all solution systems, reaching 72.24 g / g in NaCl, 62.56 g / g in CaCl2, and 34.02 g / g in deionized water.

[0061] Increasing the NaCl solution concentration from 35 g / L to 58.5 g / L further enhanced the swelling ratio of the zwitterionic hydrogel, increasing it by 21.1%, 20.9%, 13.8%, and 10.3%, respectively. The increase in swelling ratio was more pronounced with increasing SBMA content. This result indicates that even at swelling equilibrium in a 35 g / L NaCl solution, the hydrogel still contains undissociated associated structures. Furthermore, the proportion of this structure increases with increasing SBMA content. Therefore, P(SBMA-co-AM) hydrogels exhibit greater swelling potential and broader application prospects in high-salt environments.

[0062] B. The swelling effect of the composite cement-based hydrogels prepared in Examples 9, 14, and 19 was tested. The composite cement-based hydrogels were cut into small blocks and immersed in deionized water and salt solutions of different concentrations (254 mg / L NaCl, 555 mg / L CaCl2, and 396 mg / L MgCl2 solutions), respectively. After immersion for different times, the blocks were removed, their surface moisture was carefully wiped dry, and their mass was recorded until the equilibrium mass of the hydrogel no longer changed after absorbing water. The swelling rates of the composite cement-based hydrogels in salt solutions and deionized water of different concentrations were obtained.

[0063] like Figure 4As shown, the composite hydrogel exhibited good swelling ratios in various low-concentration salt solutions, reaching a maximum of 126–260 g / g. Compared to the zwitterionic hydrogel in the control group, the composite hydrogel showed a 1.44–3.72-fold increase in swelling ratio. Furthermore, the improvement in swelling ratio was even more significant in deionized water. The control group hydrogel showed a swelling ratio of only 49.75 g / g in deionized water, while the composite hydrogel achieved a maximum swelling ratio of 530 g / g, representing an increase of approximately 1000%.

[0064] C. The zwitterionic hydrogels prepared in Examples 3-5 were cut into thin slices, placed in tea bags, and approximately 3 mm thick. These slices were then immersed in different solutions. The samples were removed from the solution at regular intervals, their surface moisture was carefully wiped dry, and their mass was weighed and recorded until the material reached swelling equilibrium and the mass remained constant. Without freeze-drying, even with very thin samples, the hydrogel still required approximately 5 days to reach swelling equilibrium in the solution. This is because the molecular chain movement is relatively slow. Over time, the swelling rate decreased in various salt solutions and deionized water. In the initial swelling stage, the hydrogel's swelling rate was relatively fast, and the difference in swelling rate between different solutions was small. Immersion in a salt solution for 0.5 hours resulted in a swelling rate of 10 g / g for the zwitterionic hydrogel, and only 1 hour in deionized water. For the hydrogels with a crosslinking agent content of 0.017 mol%, the equilibrium swelling rate can be reached in about 24 hours, which is 67% to 83%. However, for the hydrogels with a crosslinking agent content of 0.0085 mol%, the swelling rate is relatively slow (approximately 59% to 79% equilibrium swelling rate can be reached in 24 hours), and the increase in swelling rate becomes very slow in the later stage of swelling.

[0065] D. Mechanical property tests were performed on the hydrogels prepared in Examples 2-6. For compression testing, hydrogel samples were cut into cylinders of ϕ25 mm × 10 mm, and each sample was measured three times at a compression rate of 10 mm / min. Hydrogels of all proportions exhibited high compressive strain (>80%). As the molar ratio of SBMA to AM decreased from 8:2 to 2:8, the compressive stress of the hydrogel gradually increased. Under the same 80% strain condition, with the increase of the AM proportion, the compressive strength of the hydrogel significantly increased from 0.03 MPa to 0.46 MPa, an increase of 1540%. This is likely due to the relatively low chain strength of PSBMA and the higher chain strength of PAM molecules, which have high entropy elasticity. Furthermore, when the amount of PEGDA 2000 decreased from 0.017 mol% to 0.0085 mol%, the compressive stress of the hydrogel with the same monomer ratio under the same strain condition also decreased. Under 80% strain conditions, reducing the crosslinking agent lowered the crosslinking density of the hydrogel network, thus reducing the compressive stress of samples S5A5, S4A6, and S2A8 by 44%, 74%, and 73.9%, respectively.

Claims

1. A method for preparing a composite hydrogel grouting material for plugging sudden water leaks, characterized in that, Includes the following steps: Step 1: [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonylpropyl)ammonium hydroxide, acrylamide monomer, crosslinking agent, photoinitiator, and solvent are fully dissolved by magnetic stirring at room temperature, and then cement-based materials are added and stirred to form a homogeneous solution; Step two: Introduce nitrogen gas to expel oxygen; Step 3: The precursor solution is photopolymerized using ultraviolet light and cross-linking to form a composite hydrogel grouting material.

2. The preparation method of the composite hydrogel grouting material for plugging water inrush according to claim 1, characterized in that: In step one, the mass ratio of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonylpropyl)ammonium hydroxide, acrylamide monomer, solvent, and cement-based material is 2~6:3~9:40~60:1~7.

3. The preparation method of the composite hydrogel grouting material for plugging sudden water leakage according to claim 2, characterized in that: In step one, the mass ratio of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonylpropyl)ammonium hydroxide to acrylamide monomer is 4~6:6~4.

4. The method for preparing a composite hydrogel grouting material for plugging sudden water leaks according to claim 1, characterized in that: In step one, the crosslinking agent is poly(ethylene glycol) ethyl acrylate with a molecular weight of 2000-5000, and the amount used is 0.006-0.009 mol of the total amount of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonylpropyl)ammonium hydroxide and acrylamide monomer.

5. The method for preparing a composite hydrogel grouting material for plugging sudden water leaks according to claim 1, characterized in that: In step one, the photoinitiator is one or more of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylacetone, and 4-methylbenzophenone, and the amount used is 0.1~0.4 mol of the total amount of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide and acrylamide monomer.

6. The method for preparing a composite hydrogel grouting material for plugging sudden water leaks according to claim 1, characterized in that: In step one, the cement-based material is one or more of ordinary silicate cement, sulfoaluminate cement, and composite silicate cement.

7. The preparation method of the composite hydrogel grouting material for plugging sudden water leakage according to claim 1, characterized in that: In step two, the nitrogen gas is introduced for at least 15 minutes.

8. The preparation method of the composite hydrogel grouting material for plugging water inrush according to claim 1, characterized in that: In step three, the crosslinking polymerization time under ultraviolet light is 2-4 hours.

9. The composite hydrogel grouting material obtained by the preparation method of the composite hydrogel grouting material for plugging water inrush as described in any one of claims 1 to 8.

10. The application of the composite hydrogel grouting material according to claim 9 in high-salt and low-salt environments.

Images