CN-121976547-A - Backfill system for rock-gap fertilizer groove cooperatively treated by super absorbent resin and curing agent and construction method

Abstract

The invention relates to the technical field of geotechnical engineering and foundation backfill, in particular to a backfill system for cooperatively treating a rock-gap fertilizer groove by using a super absorbent resin-curing agent and a construction method. The backfill system consists of a fluid state solidified soil matrix, a super absorbent resin dispersion liquid and a microcapsule slow-release alkali particle dispersion liquid, and realizes plugging, reinforcement and micro-expansion compensation shrinkage through a synergistic mechanism of super absorbent resin water-absorption expansion plugging, alkali environment water-release shrinkage and solidification body pressing into a rock gap. The construction method can complete blocking, reinforcement and backfill by one-time pumping, greatly improves work efficiency, remarkably improves impermeability by an active healing mechanism of expansion, contraction and re-pressing of the super absorbent resin, and effectively reduces carbon emission by recycling industrial solid waste, green and low carbon of the curing agent.

Inventors

• JI CHUNJIE
• Ou Songwei
• LIU HUA
• HU HESONG
• ZENG JIA
• LI CHUANHUI
• PENG GUANG
• LI YIBIN
• ZHOU XIAOLI
• WANG XIN
• ZENG KE

Assignees

• 广州建研工程科技有限公司
• 广州建筑股份有限公司
• 广州市第五建筑工程有限公司
• 广州白云城市实业投资有限公司

Dates

Publication Date

20260505

Application Date

20260203

Claims (10)

1. 1. The backfill system for the rock-gap fertilizer groove cooperatively treated by the super absorbent resin and the curing agent is characterized by comprising the following components: A fluidized solidified soil matrix, a super absorbent resin dispersion liquid and a microcapsule slow release alkali particle dispersion liquid; The fluid state solidified soil matrix comprises the following components in parts by mass: 100 parts of cementing material; 120-150 parts of aggregate; 100-120 parts of water; 0.8-1.2 parts of water reducer; 0-3 parts of an expanding agent.
2. 2. The backfill system for the rock-gap fertilizer groove cooperatively treated by the super absorbent resin and the curing agent according to claim 1 is characterized in that the cementing material comprises slag micropowder, carbide slag, red mud and alkaline residue, wherein the mass ratio of the slag micropowder to the carbide slag to the red mud to the alkaline residue is 40-60:10-20:15-25:8-12.
3. 3. The backfill system for the rock-gap fertilizer groove cooperatively treated by the super absorbent resin and the curing agent according to claim 1 is characterized in that the aggregate is engineering slag soil or construction solid waste micro powder, the particle size of the aggregate is less than or equal to 2 cm, the water reducing agent is a polycarboxylate water reducing agent, and the expanding agent is a magnesium oxide expanding agent.
4. 4. The backfill system for the rock-gap fertilizer groove cooperatively treated by the super absorbent resin and the curing agent according to claim 1 is characterized in that the preparation of the Gao Xishui resin dispersion liquid comprises the steps of uniformly mixing the super absorbent resin and water to obtain the Gao Xishui resin dispersion liquid, wherein the mass ratio of the Gao Xishui resin to the water is 1:300-500, and the particle size of the super absorbent resin is 200-400 mu m.
5. 5. The backfill system for the rock-gap fertilizer groove cooperatively treated by the super absorbent resin and the curing agent according to claim 1 is characterized in that the preparation of the microcapsule slow-release alkali particle dispersion liquid comprises the steps of uniformly mixing microcapsule slow-release alkali particles with water to obtain the microcapsule slow-release alkali particle dispersion liquid, wherein the mass ratio of the microcapsule slow-release alkali particles to the water is 1:30-50.
6. 6. The backfill system for the rock-gap fertilizer groove cooperatively treated by the super absorbent resin-curing agent according to claim 1, wherein the particle size of the microcapsule slow-release alkali particles is 50-200 μm, and the core material of the microcapsule slow-release alkali particles is NaOH and/or The wall material is ethyl cellulose.
7. 7. The backfill system for the rock-gap fertilizer groove cooperatively treated by the super absorbent resin and the curing agent according to any one of claims 1 to 6 is characterized by further comprising quick setting slurry, wherein the quick setting slurry is a mixed solution of polyurethane and water glass, and the mass percentage concentration of the polyurethane in the quick setting slurry is 45-55wt% and the mass percentage concentration of the water glass in the quick setting slurry is 20-35wt%.
8. 8. The use of the backfill system for the synergistic treatment of a rock-void fertilizer slot with a superabsorbent resin-curative as defined in any one of claims 1-7 in the backfill of a rock-void fertilizer slot, comprising the steps of: (1) Dividing the rock gaps in different areas into a class I area, a class II area and a class III area according to the opening degree of the rock gaps; (2) Burying a grouting pipe in the III-level area in the step (1), and injecting quick-setting slurry; (3) Cleaning the fertilizer groove, pumping the super absorbent resin dispersion liquid, the microcapsule slow release alkali particle dispersion liquid and the fluid state solidified soil into the fertilizer groove, and curing to finish the backfilling of the rock gap fertilizer groove.
9. 9. The application of the backfill system for the rock-gap fertilizer groove cooperatively treated by the super absorbent resin and the curing agent in the backfill of the rock-gap fertilizer groove, which is disclosed in claim 8, is characterized in that in the step (1), the rock gaps in different areas are divided into a class I area, a class II area and a class III area according to the opening degree of the rock gaps, wherein the opening degree of the rock gaps is less than or equal to 0.2 mm, the rock gaps are classified into the class I area, the opening degree of the rock gaps is less than or equal to 1. 1mm, the rock gaps are classified into the class II area, the opening degree of the rock gaps is > 1mm, the pumping pressure of the rapid hardening slurry is 0.2-0.5MPa, and the grouting concentration of the rapid hardening slurry is the same as the slurry feeding concentration in the step (2).
10. 10. The application of the backfill system for the rock-gap fertilizer groove cooperatively treated by the super absorbent resin and the curing agent in the backfill of the rock-gap fertilizer groove according to any one of claims 8-9 is characterized in that in the step (3), before the super absorbent resin dispersion liquid and the microcapsule slow-release alkali particle dispersion liquid are pumped and the fluid-state solidified soil is pumped, if the depth of the fertilizer groove is more than 3m, a transverse corrugated plate is arranged to separate each segment and less than or equal to 2m, a pumping pipe and an exhaust hole are reserved at the bottom, if the depth of the fertilizer groove is less than or equal to 3m, the transverse corrugated plate is not required to separate, the super absorbent resin dispersion liquid, the microcapsule slow-release alkali particle dispersion liquid and the fluid-state solidified soil are directly pumped, the pumping thickness of the super absorbent resin dispersion liquid is 10-20 cm, the pumping thickness of the microcapsule slow-release alkali particle dispersion liquid is 10-20 cm, the rest upper backfill is the fluid-state solidified soil, in the step (3), and before curing, the curing is carried out, if the liquid level drops by more than 50mm, the fluid-state solidified soil is filled, the step (3) comprises covering the top and then moistening the plastic film at d cm.

Description

Backfill system for rock-gap fertilizer groove cooperatively treated by super absorbent resin and curing agent and construction method Technical Field The invention relates to the technical field of geotechnical engineering and foundation backfill, in particular to a backfill system for cooperatively treating a rock clearance fertilizer groove by using a super absorbent resin-curing agent and a construction method. Background The backfill quality of the fertilizer tank directly affects the lateral limit, anti-floating and durability of the underground structure. The traditional graded sand stone, plain soil or low-strength concrete backfill has the following defects that (1) when the rock wall joints and the dissolution gaps develop, backfill materials are easy to run away along the cracks to form 'hollows', 'stringing holes', so that lateral pressure is uneven and sedimentation difference is caused, (2) a narrow fertilizer groove (with the width of 0.3-1.2 m) is difficult to mechanically vibrate, the manual tamping packing density is low, the work efficiency is poor, (3) the underground water is rich in sections, segregation and bleeding are easy to occur in underwater pouring, the strength development is slow, the environment is polluted, and (4) the common fluid state solidified soil (FLS) is adopted, the slurry is large in shrinkage after water loss, and the slurry has no active 'healing' capability on the rock gap microcracks. The super absorbent resin is used as a three-dimensional cross-linked polymer, can absorb pure water with the dead weight of tens to hundreds times, and can release water controllably in a pressurized or salt/alkali environment. The super absorbent resin is used for curing in concrete, desert water retention, roadway fire extinguishing and the like, but the special scene of 'super absorbent resin-alkaline curing agent synergy' is not seen. Alkaline curing agents (slag-alkali activator, cement-water glass, high magnesium cement, etc.) provide strength while providingThe environment can enable the super absorbent resin to release water and synchronously generate alkali-induced shrinkage, namely the resin particles lose water and shrink in volume, a channel is vacated to enable the subsequent slurry to continuously permeate into the rock gaps, the circulation of water absorption expansion caulking, loss of water loss shrinkage yielding and solidification body pressing-in is realized, and finally, a resin-hydration product interpenetrating network is formed, and the blocking, reinforcement and micro-expansion compensation shrinkage are simultaneously realized. Disclosure of Invention In order to solve the technical problems in the prior art, the invention aims to provide a backfill system for cooperatively treating a rock-clearance fertilizer groove by using a super absorbent resin and a curing agent and a construction method thereof so as to solve the technical problems. The backfill system for the rock-gap fertilizer groove cooperatively treated by the super absorbent resin and the curing agent comprises a fluid state cured soil matrix, a functional phase super absorbent resin and microcapsule slow-release alkali particles. The invention realizes plugging, reinforcement and micro-expansion compensation shrinkage through a synergistic mechanism of water absorption expansion caulking of the super absorbent resin, water release shrinkage in alkaline environment and pressing of a solidified body into a rock gap. The invention provides a backfill system for a rock-gap fertilizer groove cooperatively treated by a super absorbent resin and a curing agent and an application method (construction method) thereof, which aim to solve the problems that a 'one-time' blocking failure of a ① rock-gap leakage channel occurs, a ② fluid backfill material contracts and cracks, a ③ water-rich narrow fertilizer groove is low in construction efficiency and difficult to control in quality, and the 'reversible volume change' of the super absorbent resin is converted into a 'self-healing' driving force of rock-gap grouting for the first time, so that the problems of easy loss and large contraction of traditional fluid curing soil are solved, and a novel green, efficient and controllable backfill system is provided for the water-rich rock-gap fertilizer groove. In order to achieve the above purpose, the present invention adopts the following technical scheme. According to a first aspect of the invention, the invention provides a backfill system for a rock-gap fertilizer groove cooperatively treated by a super absorbent resin and a curing agent, which comprises the following components: A fluidized solidified soil matrix, a super absorbent resin dispersion liquid and a microcapsule slow release alkali particle dispersion liquid; The fluid state solidified soil matrix comprises the following components in parts by mass: 100 parts of cementing material; 120-150 parts of aggregate; 100-120 parts of water; 0.8-1.