Backfilling system and construction method for cooperatively processing rock gap fertilizer groove through super absorbent resin-curing agent

Abstract

The invention relates to the technical field of geotechnical engineering and foundation backfilling, in particular to a backfilling system and a construction method for cooperatively treating a rock gap fat groove through super absorbent resin and a curing agent. The backfill system is composed of a fluid-state solidified soil matrix, a super absorbent resin dispersion liquid and a microcapsule slow-release alkali particle dispersion liquid. And through a synergistic mechanism of water absorption expansion joint plugging of the super absorbent resin, water release shrinkage in an alkaline environment and pressing of a solidified body into a rock gap, plugging, reinforcing and micro-expansion shrinkage compensation are realized. According to the construction method, plugging, reinforcing and backfilling can be completed through one-time pumping, and the work efficiency is greatly improved; an active healing mechanism of expansion-shrinkage-re-press-in of the super absorbent resin is adopted, so that the anti-permeability performance is remarkably improved; the curing agent utilizes industrial solid waste as a resource, is green and low-carbon, and effectively reduces carbon emission.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering and foundation backfilling technology, and in particular to a backfilling system and construction method for treating rock fissures and trenches with a combination of superabsorbent resin and curing agent. Background Technology

[0002] The quality of backfilling trenches directly affects the lateral confinement, buoyancy resistance, and durability of underground structures. Traditional graded sand and gravel, plain soil, or low-strength concrete backfilling has the following defects: (1) When rock wall joints and solution fissures are developed, the backfill material is easily lost along the fissures, forming "voids" and "holes", resulting in uneven lateral pressure and settlement differences; (2) In narrow trenches (width 0.3~1.2 m), mechanical vibration is difficult, and manual compaction results in low density and poor work efficiency; (3) In areas with abundant groundwater, underwater pouring is prone to segregation and bleeding, slow strength development, and environmental pollution; (4) Although ordinary fluidized bed solidified soil (FLS) can be pumped, the slurry shrinks greatly after losing water and has no active "healing" ability for micro-cracks in rock fissures.

[0003] Superabsorbent polymers (SAPs), as three-dimensional cross-linked polymers, can absorb tens to hundreds of times their own weight in pure water and can release water in a controlled manner under pressure or in saline / alkali environments. Existing research has used SAPs for concrete curing, desert water retention, and tunnel fire suppression, but there is no evidence yet of a "SAP-alkaline curing agent synergy" specifically for the unique scenario of "rock crevice troughs."

[0004] Alkaline curing agents (slag-alkali activator, cement-water glass, high-magnesium cement, etc.) provide strength while... The environment allows the superabsorbent resin to release water and simultaneously undergo "alkali-induced shrinkage"—the resin particles lose water and shrink in volume, creating channels for subsequent grout to continue to seep into the rock crevices, realizing a cycle of "water absorption and expansion to seal cracks → water loss and shrinkage to make way → solidified body to be pressed in," ultimately forming an interpenetrating network of resin and hydration products, which takes into account sealing, reinforcement, and micro-expansion to compensate for shrinkage. Summary of the Invention

[0005] In order to solve the technical problems existing in the prior art, the purpose of this invention is to provide a backfilling system and construction method for the synergistic treatment of rock fissures and troughs with superabsorbent resin and curing agent to solve the above-mentioned technical problems.

[0006] The present invention provides a backfill system for treating rock fissures and grouting pits using a superabsorbent polymer (SAP) and a curing agent synergistic process. The system comprises a fluidized solidified soil matrix, a functional phase of SAP, and microcapsule-released alkali particles. The present invention achieves sealing, reinforcement, and micro-expansion compensation for shrinkage through a synergistic mechanism of SAP absorption and expansion to seal cracks, water release and shrinkage in an alkaline environment, and the injection of the solidified body into the rock fissures.

[0007] This invention provides a backfill system and its application method (construction method) for the synergistic treatment of rock fissure grouting trenches using superabsorbent resin and curing agent. The aim is to solve the following problems: ① failure of "one-time" sealing of rock fissure seepage channels; ② shrinkage and cracking of fluid backfill materials; ③ low construction efficiency and difficulty in quality control in water-rich, narrow grouting trenches. For the first time, the "reversible volume change" of superabsorbent resin is transformed into a "self-healing" driving force for rock fissure grouting, solving the problems of easy loss and large shrinkage of traditional fluidized solidified soil. This provides a green, efficient, and controllable new backfill system for water-rich rock fissure grouting trenches.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solution.

[0009] According to a first aspect of the present invention, the present invention provides a backfilling system for synergistic treatment of rock fissures and sump pits using superabsorbent resin and curing agent, comprising: Fluidized solidified soil matrix, superabsorbent resin dispersion, microcapsule slow-release alkali particle dispersion; The fluidized solidified soil matrix comprises, by mass parts: 100 parts of cementitious material; 120-150 parts aggregate; 100-120 parts water; Water-reducing agent: 0.8-1.2 parts; 0-3 parts of expanding agent.

[0010] In some embodiments, the cementing material includes slag powder, carbide slag, red mud, and alkali slag; the mass ratio of the slag powder, carbide slag, red mud, and alkali slag is 40-60:10-20:15-25:8-12.

[0011] In some embodiments, the slag powder is S95 slag powder.

[0012] In some embodiments, the aggregate is engineering waste soil or construction solid waste powder; the particle size of the aggregate is ≤2 cm; the water-reducing agent is a polycarboxylate water-reducing agent, and the expanding agent is a magnesium oxide expanding agent (used to compensate for later shrinkage).

[0013] In some embodiments, the water-reducing agent is a polycarboxylate water-reducing agent, and the water reduction rate of the water-reducing agent is ≥25%.

[0014] In some embodiments, the proportion of micro-powder with a particle size of 0-1 cm in the construction solid waste powder is ≥70%.

[0015] In some embodiments, the preparation of the superabsorbent resin dispersion includes: mixing the superabsorbent resin with water to obtain the superabsorbent resin dispersion; the mass ratio of the superabsorbent resin to water is 1:300~500; and the particle size of the superabsorbent resin is 200~400μm.

[0016] The superabsorbent resin has a pure water uptake ratio of ≥300 g / g and a 0.9% NaCl solution uptake ratio of ≥35 g / g.

[0017] The superabsorbent resin has a molecular weight of 5 million.

[0018] In some embodiments, the preparation of the microcapsule sustained-release alkali particle dispersion includes: mixing the microcapsule sustained-release alkali particles with water to obtain the microcapsule sustained-release alkali particle dispersion; the mass ratio of the microcapsule sustained-release alkali particles to water is 1:30~50.

[0019] In some embodiments, the particle size of the microcapsule sustained-release alkali particles is 50-200 μm, and the core material of the microcapsule sustained-release alkali particles is NaOH and / or The wall material is ethyl cellulose.

[0020] In some embodiments, the microcapsule sustained-release alkaline particles are stable at pH < 11 and rupture at pH > 11.5.

[0021] In some embodiments, the backfill system for treating rock fissures and sump pits with superabsorbent resin-curing agent synergistic treatment further includes a quick-setting grout; the quick-setting grout is a mixed solution of polyurethane and water glass; in the quick-setting grout, the mass percentage concentration of polyurethane is 45% to 55%, and the mass percentage concentration of water glass is 20% to 35%.

[0022] The quick-setting grout is used for instantaneous plugging of cracks >3 mm.

[0023] The superabsorbent resin-curing agent synergistic treatment system for backfilling rock fissures provided by this invention has a synergistic mechanism that consists of four stages: Stage 1 (Pumping Stage): The superabsorbent resin is evenly dispersed and absorbs free water → the particles expand to 20-40 times their original volume, blocking the rock fissure inlet and preventing the slurry from escaping. Phase 2 (Alkali Activation Phase): The microcapsule sustained-release alkali particle dispersion provides (pH≥12), the superabsorbent polymer molecular chain is carboxylated, the osmotic pressure is reversed → water is released, the volume shrinks by about 60-80%, and microchannels are freed up. Stage 3 (pressure filtration stage): The subsequent fluidized solidified soil slurry continues to seep into the rock fissures under pump pressure / self-weight, the alkaline environment is enhanced, and the "skeleton" of the superabsorbent resin after water loss interpenetrates with the cementitious material to form "organic-inorganic" composite microspheres, which are anchored on the fissure surface; Stage 4 (hardening stage): The cementitious material hydrates and releases heat, further evaporating residual moisture. The superabsorbent resin particles shrink into dense cores, eventually becoming "elastic micro-aggregates," compensating for matrix shrinkage and improving crack resistance.

[0024] According to a second aspect of the present invention, the present invention provides the application of the superabsorbent resin-curing agent synergistic treatment system for backfilling rock fissure fertilizer tanks in rock fissure fertilizer tank backfilling, comprising the following steps: (1) Rock fissure exploration and classification: According to the size of the rock fissure opening, the rock fissures in different areas are divided into Class I, Class II and Class III areas; (2) Install grouting pipes in the Class III area described in step (1) and inject quick-setting grout; (3) Clean the fertilizer tank, and use a hose pump or squeeze pump to pump superabsorbent resin dispersion, microcapsule slow-release alkali particle dispersion and fluidized solidified soil into the fertilizer tank for curing, and complete the backfilling of the rock crevice fertilizer tank.

[0025] In some implementations, in step (1), ground-penetrating radar and borehole television can be used to detect rock fissures and obtain information on the size of the rock fissure opening (marked as α).

[0026] In some implementations, in step (1), the rock fissures in different areas are divided into Class I, Class II and Class III areas according to the size of the rock fissure opening; wherein, when the rock fissure opening is ≤0.2 mm, it is classified as Class I area; when the rock fissure opening is ≤1 mm and 0.2 < 1 mm, it is classified as Class II area; when the rock fissure opening is >1 mm, it is classified as Class III area. In some embodiments, in step (2), the pump pressure for injecting the quick-setting grout is 0.2-0.5 MPa; the injection concentration of the quick-setting grout is the same as the inlet concentration.

[0027] In some implementations, in step (3), the fertilizer tank cleaning is carried out by high-pressure air and / or water flushing to ensure that there are no loose stones or mud.

[0028] In some embodiments, in step (3), before pumping the superabsorbent resin dispersion, microcapsule slow-release alkali particle dispersion, and fluidized solidified soil, if the depth of the fertilizer tank is >3 m, a transverse corrugated plate is set to separate each section ≤2 m, with a Φ50 mm pumping pipe and a Φ20 mm vent hole reserved at the bottom; if the depth of the fertilizer tank is ≤3 m, there is no need to set a transverse corrugated plate to separate the superabsorbent resin dispersion, microcapsule slow-release alkali particle dispersion, and fluidized solidified soil directly pumped. In some embodiments, in step (3), the thickness of the superabsorbent resin dispersion pumped is 10~20cm, the thickness of the microcapsule slow-release alkali particle dispersion pumped is 10~20cm, and the remaining upper backfill is fluidized solidified soil. In some implementations, in step (3), before curing, the liquid is left to stand for 30 minutes to 2 hours. If the liquid level drops by more than 50 mm, then the liquid is replenished with fluidized solidified soil. In some implementations, the maintenance described in step (3) includes covering the top with a plastic film, then filling it with 3 cm of water and keeping it moist for ≥7 days.

[0029] In some implementations, if the curing in step (3) is carried out in winter, 2% calcium nitrate is added for antifreeze and the temperature is maintained at ≥5 ℃; In some embodiments, after backfilling the rock fissure trough in step (3), the core sample integrity rate provided by the embodiment of the present invention is ≥95% and the compressive strength is ≥2 MPa.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The application method of the super absorbent resin-curing agent synergistic treatment rock fissure fertilizer trench backfill system provided in the embodiment of the present invention in rock fissure fertilizer trench backfilling utilizes the synergistic effect of super absorbent resin and alkaline curing agent to efficiently seal and reinforce fertilizer trenches with rock fissures. This is a fluid backfilling system and supporting construction method. "Sealing + reinforcement + backfilling" can be completed by one pumping, improving work efficiency by more than 50%. (2) The backfilling system for treating rock fissures and sump pits with a superabsorbent resin-curing agent synergistic treatment provided in this embodiment of the invention can achieve a permeability coefficient of <1×10 through the "active healing" mechanism of superabsorbent resin expansion-contraction-re-injection. -7 cm / s; (3) The backfill system for treating rock fissures and trenches with superabsorbent resin-curing agent synergistic treatment provided in the embodiments of the present invention has low density and low lateral pressure, which can reduce the reinforcement of basement exterior walls by 10-15%; (4) The superabsorbent resin-curing agent synergistic treatment backfill system for rock fissure fertilizer trenches provided in this embodiment of the invention is green and environmentally friendly, prepared by mixing industrial solid waste (slag, alkali slag, carbide slag), and is green and low-carbon. Emissions reduced by 30-40%; (5) The backfill system of the super absorbent resin-curing agent synergistic treatment of rock fissure fertilizer tank provided in the embodiments of the present invention is non-toxic and complies with GB 30760-2014 "Standard for Pollution Control of Solid Waste Co-processing in Cement Kiln" and TCECS 1037-2022 "Technical Standard for Filling Premixed Flow Solid Soil". Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1The mechanism of action of superabsorbent resin-curing agent in synergistic treatment of rock fissures and troughs; Figure 2 Construction process for treating rock fissures with a combination of superabsorbent resin and curing agent. Detailed Implementation

[0033] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] The weight (mass) parts used in the following examples and comparative examples are for illustrative purposes only. The weight unit can be grams, kilograms, or any other amount commonly used in the art.

[0036] The raw material information used in the following examples is shown in Table 1 below.

[0037] Table 1 Example 1 A backfilling system for rock fissure fertilizer trenches, comprising: (The system includes a superabsorbent resin-curing agent synergistic treatment method.) Fluidized solidified soil matrix, superabsorbent resin dispersion, microcapsule slow-release alkali particle dispersion, and quick-setting grout; The fluidized solidified soil matrix comprises, by mass parts: 100 parts of cementitious material; 120 parts of aggregate; 100 parts water; 0.8 parts water-reducing agent; One part of expanding agent.

[0038] The cementing material includes slag powder (S95), carbide slag, red mud, and alkali slag; the mass ratio of the slag powder, carbide slag, red mud, and alkali slag is 60:15:15:10.

[0039] The aggregate is construction solid waste powder; the particle size of the aggregate is ≤2 cm; the water-reducing agent is polycarboxylate water-reducing agent, and the expanding agent is magnesium oxide expanding agent.

[0040] The preparation of the superabsorbent resin dispersion includes: mixing superabsorbent resin and water evenly to obtain the superabsorbent resin dispersion; the mass ratio of superabsorbent resin to water is 1:500; the particle size of the superabsorbent resin is 100~400μm. The mass ratio of superabsorbent resin to slag powder (S95) is 1:60.

[0041] The preparation of the microcapsule sustained-release alkali particle dispersion includes: mixing the microcapsule sustained-release alkali particles with water evenly to obtain the microcapsule sustained-release alkali particle dispersion; the mass ratio of the microcapsule sustained-release alkali particles to water is 1:50.

[0042] The microcapsule sustained-release alkali particles have a particle size of 50-200 μm, and the core material of the microcapsule sustained-release alkali particles is NaOH and... (NaOH and) The mass ratio of the microcapsule sustained-release alkali particles to the slag powder (S95) is 1:1, and the wall material is ethyl cellulose. The mass ratio of the microcapsule sustained-release alkali particles to the slag powder (S95) is 0.3:60.

[0043] The quick-setting grout is a mixed solution of polyurethane and water glass; in the quick-setting grout, the mass concentration of polyurethane is 45% and the mass concentration of water glass is 35%.

[0044] As an example, in Embodiment 1 of the present invention, the backfilling system of the superabsorbent resin-curing agent synergistic treatment of rock fissure troughs was applied to the third underground level of a subway station. The trough was 0.8 m wide and 18 m deep, the rock was slightly weathered limestone with well-developed joints, the maximum fissure was 5 mm, and the groundwater was abundant.

[0045] This invention provides a backfilling construction method for rock fissure fertilizer trenches treated with a synergistic combination of superabsorbent resin and curing agent (application method of the backfilling system for rock fissure fertilizer trenches treated with a synergistic combination of superabsorbent resin and curing agent in rock fissure fertilizer trench backfilling), referring to... Figure 1 and Figure 2 Specifically, it includes the following steps: S1 Rock fissure exploration and classification: Using ground-penetrating radar, fissures are classified according to their aperture α as follows: α≤0.2 mm (Level I), 0.2<α≤1 mm (Level II), and α>1 mm (Level III). S2 Pretreatment: For Class III fissures, grouting pipes are installed, and quick-setting grout is injected first at a pump pressure of 0.5 MPa until the return grout concentration is consistent with the injection grout concentration. S3 Fertilizer Tank Cleaning: High-pressure air / water rinsing to ensure no loose stones or mud remain; S4 Template and Divider: Set horizontal corrugated plate dividers, each section ≤2 m, with a Φ50 mm pumping pipe and a Φ20 mm vent hole reserved at the bottom; S5 Mixing: Add the cementitious materials, aggregates, expanding agents, and water-reducing agents to a forced mixer and dry mix for 30 seconds; premix the superabsorbent resin with the mixing water to form a superabsorbent resin dispersion to prevent agglomeration; mix the microcapsule slow-release alkali granules with neutral water to form a microcapsule slow-release alkali granule dispersion. S6 Pumping: A hose pump is used with a pumping pressure of 2 MPa and a flow rate of 15 m³ / h. The filling is carried out from the bottom up. First, a superabsorbent resin dispersion with a thickness of 50 cm is pumped in, followed by a microcapsule slow-release alkali particle dispersion with a thickness of 10 cm. The remaining upper backfill material is fluidized solidified soil. S7 Secondary replenishment: After standing for 30 minutes, if the liquid level drops by more than 50 mm, replenish the fluidized solidified soil until the liquid level is level with the top of the fertilizer tank; S8 maintenance: Cover the top with plastic film and fill with 3 cm of water, keep moist for ≥7 days; S9 testing: Core samples (Φ75 mm) were taken after 7 days to observe the resin-solidified body filling in the rock fissures; the core sample integrity rate was 97%. After backfilling, the integrity rate of core samples taken from the rock fissures was 98%, the 28-day strength of the core samples was 3.2 MPa, and the permeability coefficient was 9×10⁻⁶. -8 cm / s.

[0046] Example 2 A backfilling system for rock fissure fertilizer trenches, comprising: (The system includes a superabsorbent resin-curing agent synergistic treatment method.) Fluidized solidified soil matrix, superabsorbent resin dispersion, microcapsule slow-release alkali particle dispersion, and quick-setting grout; The fluidized solidified soil matrix comprises, by mass parts: 100 parts of cementitious material; 120 parts of aggregate; 120 parts water; 0.8 parts water-reducing agent; One part of expanding agent.

[0047] The cementing material includes slag powder (S95), carbide slag, red mud, and alkali slag; the mass ratio of the slag powder, carbide slag, red mud, and alkali slag is 55:20:15:10.

[0048] The aggregate is engineering waste soil; the aggregate particle size is ≤2 cm; the water-reducing agent is polycarboxylate water-reducing agent, and the expanding agent is magnesium oxide expanding agent.

[0049] The preparation of the superabsorbent resin dispersion includes: mixing superabsorbent resin and water evenly to obtain the superabsorbent resin dispersion; the mass ratio of superabsorbent resin to water is 1:500; the particle size of the superabsorbent resin is 100~400μm. The mass ratio of superabsorbent resin to slag powder (S95) is 1:60.

[0050] The preparation of the microcapsule sustained-release alkali particle dispersion includes: mixing the microcapsule sustained-release alkali particles with water evenly to obtain the microcapsule sustained-release alkali particle dispersion; the mass ratio of the microcapsule sustained-release alkali particles to water is 1:40.

[0051] The microcapsule sustained-release alkali particles have a particle size of 50-200 μm, and the core material of the microcapsule sustained-release alkali particles is NaOH and... (NaOH and) The mass ratio is 1:1, and the wall material is ethyl cellulose. The mass ratio of the microcapsule sustained-release alkali particles to slag powder (S95) is 0.3:60.

[0052] The quick-setting grout is a mixed solution of polyurethane and water glass; in the quick-setting grout, the mass concentration of polyurethane is 50% and the mass concentration of water glass is 30%.

[0053] As an example, Embodiment 2 of the present invention applies the backfill system of superabsorbent resin-curing agent synergistic treatment of rock fissure fertilizer trench to a raft foundation fertilizer trench in a mountain building. The fertilizer trench is 0.5 m wide and has a fissure of 0.3 mm.

[0054] This invention provides a backfilling construction method for rock fissure fertilizer trenches treated with a synergistic combination of superabsorbent resin and curing agent (application method of the backfilling system for rock fissure fertilizer trenches treated with a synergistic combination of superabsorbent resin and curing agent in rock fissure fertilizer trench backfilling), referring to... Figure 2 Specifically, it includes the following steps: S1 Rock fissure exploration and classification: Using ground-penetrating radar, fissures are classified according to their aperture α as follows: α≤0.2 mm (Level I), 0.2<α≤1 mm (Level II), and α>1 mm (Level III). S2 Pretreatment: For Class III fissures, grouting pipes are installed, and quick-setting grout is injected first at a pump pressure of 0.5 MPa until the return grout concentration is consistent with the injection grout concentration. S3 Fertilizer Tank Cleaning: High-pressure air / water rinsing to ensure no loose stones or mud remain; S4 Template and Divider: Set horizontal corrugated plate dividers, each section ≤2 m, with a Φ50 mm pumping pipe and a Φ20 mm vent hole reserved at the bottom; S5 Mixing: Add the cementitious materials, aggregates, expanding agent, and water-reducing agent to a forced mixer and dry mix for 30 seconds; premix the superabsorbent resin with the mixing water to form a superabsorbent resin dispersion to prevent agglomeration; mix the microcapsule slow-release alkali granules with neutral water to form a microcapsule slow-release alkali granule dispersion. S6 Pumping: A hose pump is used with a pumping pressure of 2 MPa and a flow rate of 15 m³ / h. The filling is carried out from the bottom up. First, a superabsorbent resin dispersion with a thickness of 50 cm is pumped in, followed by a microcapsule slow-release alkali particle dispersion with a thickness of 10 cm. The remaining upper backfill material is fluidized solidified soil. S7 Secondary replenishment: After standing for 30 minutes, if the liquid level drops by more than 50 mm, replenish the fluidized solidified soil until the liquid level is level with the top of the fertilizer tank; S8 maintenance: Cover the top with plastic film and fill with 3 cm of water, keep moist for ≥7 days; S9 testing: Core samples (Φ75 mm) were taken after 7 days to observe the resin-solidified body filling in the rock fissures; the core sample integrity rate was 96%. After backfilling, the integrity rate of core samples taken from the rock fissures was 98%, the 28-day strength of the core samples was 3.5 MPa, and the permeability coefficient was 8×10⁻⁶. -8 cm / s.

[0055] The backfill system provided in this invention comprises a fluidized solidified soil matrix, a superabsorbent polymer (SAP) dispersion, and a microcapsule slow-release alkali particle dispersion. Through a synergistic mechanism of SAP absorption and expansion to seal cracks, SAP release and shrinkage in an alkaline environment, and the solidified body being pressed into rock fissures, sealing, reinforcement, and micro-expansion compensate for shrinkage are achieved. The construction method of this invention can complete "sealing + reinforcement + backfilling" with a single pumping operation, significantly improving work efficiency. The "active healing" mechanism of SAP expansion-shrinkage-re-injection significantly improves impermeability. The curing agent utilizes industrial solid waste, making it green and low-carbon, effectively reducing carbon emissions.

[0056] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A backfilling system for rock fissure fertilizer trenches using a synergistic treatment of superabsorbent resin and curing agent, characterized in that, include: Fluidized solidified soil matrix, superabsorbent resin dispersion, microcapsule slow-release alkali particle dispersion; The fluidized solidified soil matrix comprises, by mass parts: 100 parts of cementitious material; 120-150 parts aggregate; 100-120 parts water; Water-reducing agent: 0.8-1.2 parts; 0-3 parts of expanding agent.

2. The backfilling system for treating rock fissures and fertilizer trenches with a synergistic effect of superabsorbent resin and curing agent as described in claim 1, characterized in that, The cementing material includes slag powder, carbide slag, red mud, and alkali slag; the mass ratio of the slag powder, carbide slag, red mud, and alkali slag is 40-60:10-20:15-25:8-12.

3. The backfilling system for treating rock fissures and fertilizer tanks with a synergistic effect of superabsorbent resin and curing agent as described in claim 1, characterized in that, The aggregate is engineering slag or construction solid waste powder; the aggregate particle size is ≤2 cm; the water-reducing agent is polycarboxylate water-reducing agent, and the expanding agent is magnesium oxide expanding agent.

4. The backfilling system for treating rock fissures and fertilizer tanks with a synergistic effect of superabsorbent resin and curing agent as described in claim 1, characterized in that, The preparation of the superabsorbent resin dispersion includes: mixing superabsorbent resin and water evenly to obtain the superabsorbent resin dispersion; the mass ratio of superabsorbent resin to water is 1:300~500; the particle size of the superabsorbent resin is 200~400μm.

5. The backfilling system for treating rock fissures and fertilizer trenches with a combination of superabsorbent resin and curing agent as described in claim 1, characterized in that, The preparation of the microcapsule sustained-release alkali particle dispersion includes: mixing the microcapsule sustained-release alkali particles with water evenly to obtain the microcapsule sustained-release alkali particle dispersion; the mass ratio of the microcapsule sustained-release alkali particles to water is 1:30~50.

6. The backfilling system for treating rock fissures and fertilizer trenches with a synergistic effect of superabsorbent resin and curing agent as described in claim 1, characterized in that, The microcapsule sustained-release alkali particles have a particle size of 50~200 μm, and the core material of the microcapsule sustained-release alkali particles is NaOH and / or The wall material is ethyl cellulose.

7. The backfilling system for treating rock fissures and fertilizer tanks using a superabsorbent resin-curing agent synergistic treatment according to any one of claims 1-6, characterized in that, It also includes a quick-setting grout; the quick-setting grout is a mixed solution of polyurethane and water glass; in the quick-setting grout, the mass percentage concentration of polyurethane is 45wt% to 55wt%, and the mass percentage concentration of water glass is 20wt% to 35wt%.

8. The application of the superabsorbent resin-curing agent synergistic treatment system for backfilling rock fissure fertilizer tanks according to any one of claims 1-7 in the backfilling of rock fissure fertilizer tanks, characterized in that, Includes the following steps: (1) Based on the size of the rock fissures, the rock fissures in different areas are divided into Class I, Class II and Class III areas; (2) Install grouting pipes in the Class III area described in step (1) and inject quick-setting grout; (3) Clean the fertilizer tank, pump superabsorbent resin dispersion, microcapsule slow-release alkali particle dispersion and fluidized solidified soil into the fertilizer tank, cure, and complete the backfilling of the rock crevice fertilizer tank.

9. The application of the superabsorbent resin-curing agent synergistic treatment system for backfilling rock fissure fertilizer tanks according to claim 8 in the backfilling of rock fissure fertilizer tanks, characterized in that, In step (1), the rock fissures in different areas are divided into Class I, Class II and Class III areas according to the size of the rock fissure opening; among them, when the rock fissure opening is ≤0.2 mm, it is classified as Class I area; when the rock fissure opening is ≤1 mm, it is classified as Class II area; when the rock fissure opening is >1 mm, it is classified as Class III area; in step (2), the pump pressure of the injected quick-setting grout is 0.2-0.5 MPa; the injection concentration of the quick-setting grout is the same as the grout concentration of the return grout.

10. The application of the superabsorbent resin-curing agent synergistic treatment system for backfilling rock fissure fertilizer tanks according to any one of claims 8-9 in the backfilling of rock fissure fertilizer tanks, characterized in that, In step (3), before pumping the superabsorbent resin dispersion, microcapsule slow-release alkali particle dispersion, and fluidized solidified soil, if the depth of the fertilizer tank is >3 m, a transverse corrugated plate is set to separate each section ≤2 m, and a pumping pipe and vent hole are reserved at the bottom; if the depth of the fertilizer tank is ≤3 m, there is no need to set a transverse corrugated plate to separate the superabsorbent resin dispersion, microcapsule slow-release alkali particle dispersion, and fluidized solidified soil are directly pumped; in step (3), the thickness of the superabsorbent resin dispersion pumped is 10~20 cm, the thickness of the microcapsule slow-release alkali particle dispersion pumped is 10~20 cm, and the remaining upper backfill is fluidized solidified soil; in step (3), before curing, let it stand for 30 min~2 h, and if the liquid level drops >50 mm, then replenish the fluidized solidified soil; the curing in step (3) includes: covering the top with a plastic film, then filling it with 3 cm of water, and keeping it moist for ≥7 days.

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