A water-based epoxy resin mortar rapid repair material for high-speed rail tunnel leakage water disease rapid repair and a preparation process thereof

Abstract

The application belongs to the technical field of cement-based grouting and provides a water-based epoxy resin mortar rapid repair material for rapid repair of high-iron tunnel water leakage disease and a preparation process, which is made of the following components: 80-110 parts of magnesium phosphate cement, 5-20 parts of water-based epoxy resin, 8-25 parts of epoxy resin curing agent, 10-25 parts of fly ash, 5-10 parts of retarder, 1-2 parts of defoaming agent and 12-25 parts of water; the magnesium phosphate cement comprises magnesium oxide and phosphate; the magnesium oxide is a mixture of dead-burned magnesium oxide and light-burned magnesium oxide, and the mass ratio of the two is 3:1-20:1. The grouting material prepared by the formula and the preparation method has the advantages of short setting time, high early strength, strong wet adhesion, good durability and good fluidity.

Description

Technical Field

[0001] This invention belongs to the field of cement-based grouting technology and relates to a water-based epoxy resin modified repair material, specifically a water-based epoxy resin mortar rapid repair material and its preparation process for rapid repair of water leakage in high-speed railway tunnels. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] As the operational mileage of tunnels continues to increase, the number of defects in tunnels during their service life is also increasing. These defects include tunnel lining seepage, water inrush, backfill voids, rockfalls, and cracks. Among these defects, backfill voids account for a large proportion. Backfill voids will change the stress on the lining and form water pockets at the voids, leading to increased local stress in the backfill, eventually causing cracks and seepage, which seriously affects the tunnel's lifespan and operational safety.

[0004] Grouting materials used for tunnel lining voids can be broadly classified into chemical-based and cement-based types. Traditional cement-based materials have advantages such as adjustable fluidity, the ability to incorporate mineral admixtures, and low grouting costs. However, currently used ordinary cement-based grouting materials have slow setting times and low early strength, resulting in prolonged grouting time for remediation.

[0005] Furthermore, ordinary cement-based grouting materials have poor adhesion to old concrete, affecting the stability, durability, and service life of the lining. Epoxy resin is a commonly used chemical grouting material with excellent bonding and mechanical properties. However, due to its high viscosity, it is prone to clogging equipment during construction. Moreover, when mixed with other materials, it is prone to agglomeration, leading to uneven grouting results and problems such as cracking and water seepage.

[0006] Waterborne epoxy resin refers to oleophilic epoxy resin that has been modified by physical or chemical methods to disperse in a medium with water as the continuous phase, forming a stable dispersion system or aqueous solution. Compared with traditional oil-based epoxy resin, waterborne epoxy resin does not produce large amounts of VOCs (volatile organic compounds) during use, thus reducing harm to human health and the natural environment, making it an environmentally friendly material.

[0007] Patent CN106565193A discloses a phosphate grouting material, comprising component A and component B. Component A consists of 80-100 parts by weight of magnesium oxide, 10-20 parts by weight of water, 0.1-5 parts by weight of retarder, 0.1-5 parts by weight of wetting and dispersing agent, 0.1-5 parts by weight of water-reducing agent, and 0.1-5 parts by weight of water-based epoxy resin curing agent. Component B consists of 30-60 parts by weight of phosphate, 5-20 parts by weight of water, 5-20 parts by weight of fiber, and 0.1-5 parts by weight of early-strength agent. However, due to the absence of water-based epoxy resin, it cannot cross-link with the curing agent to form a three-dimensional network cross-linked structure, resulting in poor water resistance and making it unsuitable for treating water leakage in high-speed railway tunnels. Furthermore, its retarding effect and durability still need improvement. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a water-based epoxy resin mortar rapid repair material and its preparation process for quickly repairing water leakage in high-speed railway tunnels. Unlike existing methods that simply mix lightly and heavily calcined magnesium oxide, this invention utilizes the different activities and varying degrees of reaction with phosphates of magnesium oxide prepared at different sintering temperatures. By compounding these magnesium oxides and reacting them with phosphates, the reaction rate can be controlled from the raw material perspective. Furthermore, the effect of using a retarder is more significant than using a retarder alone. Moreover, since retarders can reduce the service performance of magnesium phosphate materials, compounding magnesium oxides from different sintering temperatures to achieve a retarding effect reduces the degradation of magnesium phosphate cement performance compared to using a retarder alone. The grouting material prepared by this invention through its formulation and preparation method possesses advantages such as short setting time, high early strength, strong wet bonding, good durability, and good fluidity.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention provides a water-based epoxy resin mortar rapid repair material for rapid repair of water leakage in high-speed railway tunnels, which is made of the following components: 80-110 parts magnesium phosphate cement, 5-20 parts water-based epoxy resin, 8-25 parts epoxy resin curing agent, 10-25 parts fly ash, 5-10 parts retarder, 1-2 parts defoamer, and 12-25 parts water.

[0011] The magnesium phosphate cement comprises: magnesium oxide and phosphate; the magnesium oxide is a mixture of dead-burned magnesium oxide and light-burned magnesium oxide, with a mass ratio of 3:1 to 20:1.

[0012] The calcined magnesium oxide is any one of the magnesium oxides produced by calcining magnesite at 1600℃, 1700℃, or 1800℃.

[0013] The lightly calcined magnesia is any one of those produced by calcining magnesite at 800℃, 900℃, or 1000℃.

[0014] In some embodiments, the phosphate is potassium dihydrogen phosphate, industrial grade, with a purity of 99% or higher.

[0015] In some embodiments, the magnesium phosphate cement comprises: 60-80 parts of magnesium oxide and 15-35 parts of phosphate.

[0016] In some embodiments, the epoxy resin in the waterborne epoxy resin is one or more of glycidyl ether type, glycidyl ester type, glycidyl amine type, and alicyclic epoxy resin; the present invention utilizes the crosslinking reaction between waterborne epoxy resin and waterborne epoxy resin curing agent to produce a waterborne epoxy three-dimensional network structure, which has significantly improved water resistance and is more suitable for water leakage in high-speed railway tunnels.

[0017] In some embodiments, the preparation method of the waterborne epoxy resin is one of the mechanical method, the phase inversion method, and the self-emulsification method.

[0018] In some embodiments, the epoxy resin curing agent is one or more of polyamines, acid anhydrides, phenolic resins, and polythiols.

[0019] In some embodiments, the fly ash is Class II fly ash;

[0020] In some embodiments, the defoamer is one or a mixture of mineral oils, polyethers, and fatty alcohols. The magnesium phosphate cement of this invention is an inorganic material, while the water-based epoxy resin and its curing agent are organic materials. When inorganic and organic materials are compounded, many bubbles are generated due to differences in interfacial tension, reducing the mechanical properties and durability of the composite material. Therefore, this application incorporates a defoamer, which significantly improves the service performance, workability, and durability of the grouting material.

[0021] In some embodiments, the retarder is a compound of industrial-grade borax and sodium tripolyphosphate in a ratio of 1:0.8 to 1.2.

[0022] A second aspect of the present invention provides a method for preparing a water-based epoxy resin mortar rapid repair material for rapid repair of water leakage in high-speed railway tunnels, comprising:

[0023] Magnesium oxide and retarder are mixed evenly to obtain the first mixture;

[0024] Water-based epoxy resin, epoxy resin curing agent, and water are added to the mixture and mixed evenly to obtain a second mixture.

[0025] Phosphate and fly ash are added to the second mixture and mixed evenly to obtain the third mixture;

[0026] Add the defoamer to the third mixture and mix thoroughly to obtain the final product.

[0027] Specifically, including:

[0028] (1) Weigh out the magnesium oxide and retarder according to the specified amount, mix them in a mixer, and dry mix at low speed (150r / min) for 20-30s until they are evenly mixed.

[0029] (2) Weigh out the water-based epoxy resin, epoxy resin curing agent and water according to the specified amount, add them to the mixture in step (1), stir at low speed for 20s, and then stir at high speed (300r / min) for 40s.

[0030] (3) Weigh out the phosphate and fly ash according to the amount, add them to the mixture in step (2), stir at low speed for 10s, and then stir at high speed for 60s.

[0031] (4) Weigh out the defoaming agent according to the specified amount and add it to the mixture obtained in step (3). Stir at low speed for 20 seconds to obtain the final product.

[0032] A third aspect of the present invention provides the application of the above-described repair material in the field of tunnel engineering.

[0033] Beneficial effects of the present invention

[0034] The key technical problem this invention aims to solve is to address the shortcomings of existing technologies by providing a water-based epoxy resin mortar rapid repair material and its preparation process for quickly repairing water leakage in high-speed railway tunnels. Compared to existing technologies, this invention has the following advantages:

[0035] (1) This invention uses magnesium phosphate cement as the main agent to achieve rapid setting and hardening of grouting material and provide sufficient early strength for grouting material. By adjusting the ratio and dosage of retarder, the setting time of grouting material can be controlled, providing a grouting material with adjustable and controllable setting time and fast hardening and early strength for tunnel lining void treatment.

[0036] (2) The addition of water-based epoxy resin and curing agent can form a three-dimensional network structure in the grouting material, which improves the mechanical properties, water resistance, and heat resistance of magnesium phosphate grouting material on the one hand; on the other hand, due to the high adhesion of epoxy resin, the bonding strength between the grouting material and the old concrete interface is improved, thus ensuring the grouting treatment effect. Secondly, compared with non-water-based epoxy resin, water-based epoxy resin has a lower viscosity, which can effectively reduce the impact on the fluidity of the grouting material, thereby reducing the standards for grouting pressure and equipment.

[0037] (3) The addition of an appropriate amount of defoamer in this invention can effectively reduce the bubbles generated during the mixing process of water-based epoxy resin and curing agent and the mixing process of magnesium phosphate cement slurry, which helps to improve the mechanical properties and durability of grouting materials.

[0038] (4) Due to the relatively small particle size of fly ash, it can fill the three-dimensional network structure formed by water-based epoxy resin. On the other hand, it can act as a micro-crystal nucleus as a growth point for hydration products during the hydration process of magnesium phosphate cement, thereby increasing the degree of hydration and thus improving the compressive strength of the grouting material. Secondly, the spherical microstructure of fly ash can improve the fluidity of the grouting material.

[0039] (5) The preparation process of the present invention is simple, and the mixing of grouting materials can be completed at room temperature; the addition of phosphate to the mixture solution at the end can prevent magnesium oxide and phosphate from undergoing premature hydration reaction during dry mixing, which is beneficial to the control of setting time. Detailed Implementation

[0040] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0041] The present invention will be further described in detail below with reference to specific embodiments. It should be noted that the specific embodiments are explanations of the present invention and not limitations thereof.

[0042] In the following examples, the waterborne epoxy resin, epoxy resin curing agent, and defoamer are all commercially available products.

[0043] Example 1:

[0044] This embodiment provides a water-based epoxy resin mortar rapid repair material and its preparation process for rapid repair of water seepage defects in high-speed railway tunnels. The material and preparation method include the following steps:

[0045] (1) Weigh 10 parts of lightly calcined magnesium oxide (calcination temperature: 1000℃) and 80 parts of heavily calcined magnesium oxide (calcination temperature: 1600℃), 10 parts of borax and 4 parts of sodium tripolyphosphate, mix them in a mixer, and dry mix at low speed (150r / min) for 20-30s until the mixture is uniform.

[0046] (2) Weigh 5 parts of waterborne epoxy resin, 7 parts of epoxy resin curing agent and 22 parts of water, add them to the mixture in step (1), stir at low speed for 20s, and then stir at high speed (300r / min) for 40s.

[0047] (3) Weigh 30 parts of phosphate and 10 parts of fly ash, add them to the mixture in step (2), stir at low speed for 10 seconds, and then stir at high speed for 60 seconds.

[0048] (4) Weigh 1 part of defoamer and add it to the mixture in step (3), stir at low speed for 20 seconds to obtain the final product.

[0049] Example 2:

[0050] This embodiment provides a water-based epoxy resin mortar rapid repair material and its preparation process for rapid repair of water seepage defects in high-speed railway tunnels. The material and preparation method include the following steps:

[0051] (1) Weigh 10 parts of lightly calcined magnesium oxide (calcination temperature: 900℃) and 80 parts of heavily calcined magnesium oxide (calcination temperature: 1700℃), 10 parts of borax and 4 parts of sodium tripolyphosphate, mix them in a mixer, and dry mix at low speed (150r / min) for 20-30s until the mixture is uniform.

[0052] (2) Weigh 10 parts of waterborne epoxy resin, 14 parts of epoxy resin curing agent and 22 parts of water, add them to the mixture in step (1), stir at low speed for 20s, and then stir at high speed (300r / min) for 40s.

[0053] (3) Weigh 30 parts of phosphate and 10 parts of fly ash, add them to the mixture in step (2), stir at low speed for 10 seconds, and then stir at high speed for 60 seconds.

[0054] (4) Weigh 2 portions of defoamer and add them to the mixture in step (3), stir at low speed for 20 seconds to obtain the final product.

[0055] Example 3:

[0056] This embodiment provides a water-based epoxy resin mortar rapid repair material and its preparation process for rapid repair of water seepage defects in high-speed railway tunnels. The material and preparation method include the following steps:

[0057] (1) Weigh 10 parts of lightly calcined magnesium oxide (calcination temperature: 800℃) and 80 parts of heavily calcined magnesium oxide (calcination temperature: 1800℃), 10 parts of borax and 4 parts of sodium tripolyphosphate, mix them in a mixer, and dry mix at low speed (150r / min) for 20-30s until they are evenly mixed.

[0058] (2) Weigh 15 parts of waterborne epoxy resin, 21 parts of epoxy resin curing agent and 22 parts of water, add them to the mixture in step (1), stir at low speed for 20s, and then stir at high speed (300r / min) for 40s.

[0059] (3) Weigh 30 parts of phosphate and 10 parts of fly ash, add them to the mixture in step (2), stir at low speed for 10 seconds, and then stir at high speed for 60 seconds.

[0060] (4) Weigh 1 part of defoamer and add it to the mixture in step (3), stir at low speed for 20 seconds to obtain the final product.

[0061] Comparative Example 1: (Compared to Example 1, no waterborne epoxy resin, its curing agent, or fly ash were added)

[0062] The rapid repair material in this comparative example comprises the following components: lightly calcined magnesium oxide (calcination temperature: 1000℃), darkly calcined magnesium oxide (calcination temperature: 1600℃), borax, sodium tripolyphosphate, phosphate, defoamer, and water. The rapid repair material is prepared using the following method:

[0063] (1) Weigh 10 parts of lightly calcined magnesium oxide, 80 parts of heavily calcined magnesium oxide, 10 parts of borax, and 4 parts of sodium tripolyphosphate. Mix them in a mixer and dry mix at low speed (150 r / min) for 20 to 30 seconds until they are evenly mixed.

[0064] (2) Weigh 21 parts of water and add them to the mixture in step (1). Stir at low speed for 20 seconds, and then stir at high speed (300 r / min) for 40 seconds.

[0065] (3) Weigh 30 parts of phosphate and add them to the mixture in step (2). Stir at low speed for 10 seconds and then at high speed for 60 seconds.

[0066] (4) Weigh 1 part of defoamer and add it to the mixture in step (3), stir at low speed for 20 seconds to obtain the final product.

[0067] Comparative Example 2: (No fly ash was added compared to Example 2)

[0068] This comparative example of a waterborne epoxy rapid repair material comprises the following components (calcination temperature: 900℃), recalcined magnesium oxide (calcination temperature: 1700℃), waterborne epoxy resin, epoxy resin curing agent, borax, sodium tripolyphosphate, phosphate, defoamer, and water. The rapid repair material is prepared using the following method:

[0069] (1) Weigh 10 parts of lightly calcined magnesium oxide, 80 parts of heavily calcined magnesium oxide, 10 parts of borax, and 4 parts of sodium tripolyphosphate. Mix them in a mixer and dry mix at low speed (150 r / min) for 20 to 30 seconds until they are evenly mixed.

[0070] (2) Weigh 10 parts of waterborne epoxy resin, 14 parts of epoxy resin curing agent and 21 parts of water, add them to the mixture in step (1), stir at low speed for 20s, and then stir at high speed (300r / min) for 40s.

[0071] (3) Weigh 30 parts of phosphate and add them to the mixture in step (2). Stir at low speed for 10 seconds and then at high speed for 60 seconds.

[0072] (4) Weigh 2 portions of defoamer and add them to the mixture in step (3), stir at low speed for 20 seconds to obtain the final product.

[0073] Comparative Example 3: (Compared to Example 2, no waterborne epoxy resin and its curing agent were added)

[0074] The rapid repair material in this comparative example comprises the following components: lightly calcined magnesium oxide, darkly calcined magnesium oxide, fly ash, borax, sodium tripolyphosphate, phosphate, defoamer, and water. The rapid repair material is prepared using the following method:

[0075] (1) Weigh 10 parts of lightly calcined magnesium oxide, 80 parts of heavily calcined magnesium oxide, 10 parts of borax, and 4 parts of sodium tripolyphosphate. Mix them in a mixer and dry mix at low speed (150 r / min) for 20 to 30 seconds until they are evenly mixed.

[0076] (2) Weigh 22 parts of water and add them to the mixture in step (1). Stir at low speed for 20 seconds, and then stir at high speed (300 r / min) for 40 seconds.

[0077] (3) Weigh 30 parts of phosphate and 10 parts of fly ash, add them to the mixture in step (2), stir at low speed for 10 seconds, and then stir at high speed for 60 seconds.

[0078] (4) Weigh 2 portions of defoamer and add them to the mixture in step (3), stir at low speed for 20 seconds to obtain the final product.

[0079] Comparative Example 4:

[0080] The difference from Example 2 is that 90 parts of lightly calcined magnesium oxide (calcination temperature: 900°C) were used, and no recalcined magnesium oxide was added.

[0081] Comparative Example 5:

[0082] The difference from Example 2 is that 90 parts of recalcined magnesium oxide (calcination temperature: 1700°C) were used, and no lightly calcined magnesium oxide was added.

[0083] Test and experiment:

[0084] The rapid repair materials prepared in Specific Examples 1-3 and Comparative Examples 1-5 were subjected to tests of flexural and compressive mechanical properties, setting time, interfacial flexural bond strength, and water resistance.

[0085] The performance indicators of the waterborne epoxy rapid repair materials in specific embodiments 1-3 and comparative examples 1-5 are shown in Table 1:

[0086] Table 1. Main performance indicators of water-based epoxy rapid repair materials

[0087]

[0088]

[0089] Note: The flexural and compressive strength tests of the rapid repair material are conducted according to the "Test Method for Strength of Cement Mortar (ISO Method)" (GB / T 17671-2021). The prepared repair material is demolded within 3 hours and naturally cured at room temperature for 7 days. The 7-day flexural and compressive strengths are then measured. The setting time is determined according to the "Test Method for Standard Consistency Water Requirement, Setting Time and Soundness of Cement" (GB / T1346-2011). Since the initial setting time and final setting time of this material are very close, the initial setting time is used to represent the setting time of the rapid repair material in the test. The interfacial flexural bond strength is determined according to JC / T The test was conducted according to 2381-2016, testing the interfacial adhesion performance of each comparative example and embodiment after natural curing at room temperature for 7 days. The water resistance test was mainly determined based on the strength loss rate of the specimens after water curing. The specific implementation method was to divide the specimens of the same embodiment or comparative example into two groups, place them for natural curing at room temperature for 7 days, then place one group in water at 20°C for 3 days, and the other group continued to be naturally cured at room temperature for 3 days. After curing, the ratio of the compressive strength of the water-cured specimens to that of the naturally cured specimens was measured, i.e., the water resistance coefficient (M), as shown in the following formula:

[0090]

[0091] In the formula: R w The compressive strength of specimens cured naturally for 7 days and cured in water for 3 days;

[0092] R a The compressive strength of specimens cured naturally for 10 days.

[0093] Table 1 shows that the waterborne epoxy resin mortar rapid repair material prepared by this invention has excellent bonding and water resistance properties. The interfacial flexural bond strength after 7 days can reach 6 MPa, and the water resistance coefficient can reach 0.96. According to Examples 1-3 and Comparative Examples 1-5, the waterborne epoxy resin has a significant effect on the compressive strength of the mortar. With the addition of waterborne epoxy resin, the compressive strength of the mortar decreases, which is related to the properties of the cured products of waterborne epoxy resin. However, the decrease in the flexural strength of the mortar is not significant. After adding fly ash, its active effect is obvious, generating cementitious products such as hydrated magnesium silicate, which form a more stable skeleton structure with magnesia and other hydration products, playing a reinforcing role and improving flexural and compressive strength. The addition of waterborne epoxy resin has a significant retarding effect on magnesium phosphate-based repair mortar, and the setting time increases with the increase of waterborne epoxy mortar dosage. When the waterborne epoxy dosage is 5 parts, the setting time is about 30 minutes, and when the dosage is 15 parts, the setting time can reach 6 minutes. The 0 min setting time indicates that the addition of water-based epoxy resin delayed the neutralization reaction of magnesium oxide and potassium dihydrogen phosphate. Therefore, the addition of water-based epoxy resin allows for adjustable and controllable setting time of the repair mortar, achieving early strength and rapid setting. After adding 10 parts of fly ash, the setting time of the water-based epoxy mortar was further extended, indicating that the fly ash dispersed in the magnesium phosphate cement slurry prevented the early rapid setting of the magnesium phosphate cement. Water-based epoxy resin can enhance the interfacial adhesion between the rapid repair mortar and the old concrete surface. The more water-based epoxy resin, the higher the interfacial bond flexural strength, which can reach up to 6.0 MPa. The addition of water-based epoxy resin significantly improves the water resistance of the rapid repair material. This is related to the characteristics of water-based epoxy resin, which can complete setting and hardening in water, thereby ensuring the mechanical properties of the repair mortar.

[0094] The comparison of Examples 2, 4, and 5 shows that the combination of magnesium oxide with different sintering temperatures can improve strength while ensuring the retarding effect.

[0095] The water-based epoxy resin mortar rapid repair material of the present invention for rapid repair of water leakage in high-speed railway tunnels can be applied to the grouting of voids and the repair of cracks in tunnel linings in humid environments. It can also be used as a surface repair material for hydraulic concrete structures and a grouting material for voids in bridge abutment slabs.

[0096] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A water-based epoxy resin mortar rapid repair material for rapid repair of water leakage in high-speed railway tunnels, characterized in that, It is made from the following components: 80-110 parts magnesium phosphate cement, 5-20 parts waterborne epoxy resin, 8-25 parts epoxy resin curing agent, 10-25 parts fly ash, 5-10 parts retarder, 1-2 parts defoamer, and 12-25 parts water. The magnesium phosphate cement comprises: magnesium oxide and phosphate; the magnesium oxide is a mixture of dead-burned magnesium oxide and light-burned magnesium oxide, with a mass ratio of 3:1 to 20:

1. The dead-burned magnesium oxide is any one of the magnesium oxides produced by calcining magnesite at 1600℃, 1700℃, and 1800℃; The lightly calcined magnesia is any one of the magnesite produced by calcining at 800℃, 900℃, or 1000℃; The retarder is a compound of industrial-grade borax and sodium tripolyphosphate in a ratio of 1:0.8~1.

2.

2. The water-based epoxy resin mortar rapid repair material for rapid repair of water leakage in high-speed railway tunnels as described in claim 1, characterized in that, The phosphate is potassium dihydrogen phosphate.

3. The water-based epoxy resin mortar rapid repair material for rapid repair of water leakage in high-speed railway tunnels as described in claim 1, characterized in that, The magnesium phosphate cement comprises: 60-80 parts magnesium oxide and 15-35 parts phosphate.

4. The water-based epoxy resin mortar rapid repair material for rapid repair of water leakage in high-speed railway tunnels as described in claim 1, characterized in that, The waterborne epoxy resin is one or more of the following: glycidyl ether type, glycidyl ester type, glycidyl amine type, and alicyclic epoxy resin.

5. The water-based epoxy resin mortar rapid repair material for rapid repair of water leakage in high-speed railway tunnels as described in claim 1, characterized in that, The preparation method of waterborne epoxy resin is one of the following: mechanical method, phase inversion method, and self-emulsification method.

6. The water-based epoxy resin mortar rapid repair material for rapid repair of water leakage in high-speed railway tunnels as described in claim 1, characterized in that, The epoxy resin curing agent is one or more of the following: polyamine, acid anhydride, phenolic, and polythiol. Alternatively, the fly ash may be Class II fly ash.

7. The water-based epoxy resin mortar rapid repair material for rapid repair of water leakage in high-speed railway tunnels as described in claim 1, characterized in that, The defoamer is one or a mixture of mineral oils, polyethers, and fatty alcohols.

8. The preparation method of the water-based epoxy resin mortar rapid repair material for rapid repair of water leakage in high-speed railway tunnels as described in claim 1, characterized in that, include: Magnesium oxide and retarder are mixed evenly to obtain the first mixture; Water-based epoxy resin, epoxy resin curing agent, and water are added to the mixture and mixed evenly to obtain a second mixture. Phosphate and fly ash are added to the second mixture and mixed evenly to obtain the third mixture; Add the defoamer to the third mixture and mix thoroughly to obtain the final product.

9. The application of the repair material according to any one of claims 1-7 in the field of tunnel engineering.

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