CN113277797A - Grouting material for treating subsidence area - Google Patents
Grouting material for treating subsidence area Download PDFInfo
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- CN113277797A CN113277797A CN202110520304.0A CN202110520304A CN113277797A CN 113277797 A CN113277797 A CN 113277797A CN 202110520304 A CN202110520304 A CN 202110520304A CN 113277797 A CN113277797 A CN 113277797A
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- China
- Prior art keywords
- grouting
- grouting material
- powder particles
- treating
- fly ash
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a grouting material for treating a subsidence area, which is prepared by uniformly mixing the following raw materials in percentage by mass and drying the mixture until the water content is lower than 5 percent: 20-45% of mineral powder particles, 5-10% of steel slag powder particles, 5-15% of Portland cement, 1-3% of anhydrous sodium sulphate, 5-25% of fly ash and 20-50% of construction waste aggregate. The invention has low cost and high early strength.
Description
Technical Field
The invention relates to the field of grouting treatment of subsidence areas, in particular to a grouting material for treating subsidence areas.
Background
China has a large number of subsidence areas formed by coal mine goafs, and due to the coal goafs, the ground surface on the upper parts of the subsidence areas subsides, so that not only ground surface vegetation is damaged, but also the upper parts of the subsidence areas cannot be constructed and utilized, and a large amount of waste is caused. With the development of the traffic cause of China, in recent years, the construction of highways in mine areas in North China and northwest China meets the problem of coal mine goafs, and when the highways are constructed above the goafs, the damage to vehicles running at high speed due to the inclination of the road surface caused by the subsidence of the ground surface of the goafs is great; the horizontal deformation and the horizontal movement enable the pavement to be stretched, cracked, compressed and raised, the pavement generates wavy fluctuation, and the pavement or the roadbed generates local separation damage; the wave fluctuation of the road surface can empty the vehicles running at high speed to cause the rollover accident. The goaf problem is more and more prominent as a bad geological problem of highway construction, is one of important factors influencing the construction of the goaf, and is directly related to the quality and the economic benefit of highway construction.
At present, the treatment means of collapse areas in China is mainly grouting. The grouting material mainly adopted at the present stage is prepared by mixing cement and fly ash according to the proportion of 0.3:0.7, and then mixing the mixture with water according to the proportion of 1:1 to prepare grouting liquid. However, the grouting material prepared by mixing cement and fly ash has the following disadvantages:
the grouting slurry has poor fluidity, and the grouting slurry is often blocked, so that the water-cement ratio needs to be increased to improve the fluidity of the grouting slurry;
secondly, because the water-cement ratio is increased, the formed consolidated body after the grouting liquid is solidified is low in degree, and the reinforcing effect on the rock stratum of the subsidence area is not good;
the cement consumption is large, and the grouting cost is high;
the slurry is long in setting time, and large displacement still occurs in an early collapse area after grouting.
At present, the quantity of the construction waste in China accounts for 30-40% of the total quantity of the municipal waste. Calculated according to the standard of 500-600 tons per ten thousand square meters, by 2025 years, the newly increased building area of about 300 hundred million square meters is added in China, and newly generated building garbage is a shocking number. However, most of the construction wastes are not treated, and are transported to the suburbs or villages by construction units, and are piled or buried in the open air, so that a large amount of construction expenses such as land acquisition expenses and garbage clearing and transporting expenses are consumed, and meanwhile, the problems of scattering, dust, sand flying and the like in the clearing and piling processes cause serious environmental pollution.
Disclosure of Invention
The invention aims to provide a grouting material for treating a collapse area, which has low cost and high early strength.
In order to solve the problems, the grouting material for treating the subsidence area is characterized in that: the grouting material is prepared by uniformly mixing the following raw materials in percentage by mass and drying until the water content is lower than 5 percent: 20-45% of mineral powder particles, 5-10% of steel slag powder particles, 5-15% of Portland cement, 1-3% of anhydrous sodium sulphate, 5-25% of fly ash and 20-50% of construction waste aggregate.
The specific surface area of the mineral powder particles is not less than 450 m2/kg。
The specific surface area of the steel slag powder particles is not less than 480 m2/kg。
The portland cement has a mark number of not less than 42.5R.
The fly ash is II gradeFly ash with specific surface area not less than 420 m2/kg。
The building waste aggregate is the aggregate with the particle size of 1-5 mm, which is obtained by sorting, crushing and screening bricks, stones and concrete waste in the building waste.
Compared with the prior art, the invention has the following advantages:
1. the early strength is high.
The invention adopts the anhydrous sodium sulphate and the cement, and simultaneously, the early hydration reaction activity of the mineral powder particles and the steel slag particles is further excited through mechanical grinding; after the grouting material is mixed with water according to a certain proportion to prepare grouting liquid, the grouting liquid is pumped into the subsidence area rock stratum, and the grouting liquid can be quickly solidified to form a high-strength consolidation body, so that the subsidence area rock stratum can provide higher supporting force in the early stage after grouting.
2. The shrinkage rate is low.
The shrinkage rate of a solidified body formed by mixing the grouting material and water is lower than 0.5 percent, so that the defect of secondary grouting reinforcement of the traditional cement grout is overcome.
3. The cost is low.
The invention adopts a large amount of industrial solid wastes such as mineral powder particles, steel slag particles, fly ash and the like, and simultaneously adopts construction wastes to prepare the aggregate, the raw materials have very low price and are even free, and when the industrial solid waste raw materials are reused, certain government tax benefits and subsidies can be enjoyed, thereby greatly reducing the cost of the grouting material.
Detailed Description
A grouting material for treating a subsidence area is prepared by uniformly mixing the following raw materials in percentage by mass and drying the mixture until the water content is lower than 5 percent: 20-45% of mineral powder particles, 5-10% of steel slag powder particles, 5-15% of Portland cement, 1-3% of anhydrous sodium sulphate, 5-25% of fly ash and 20-50% of construction waste aggregate.
Wherein: the mineral powder particles are prepared by grinding and drying slag in a ball mill, and the specific surface area of the mineral powder particles is not less than 450 m2/kg。
The fine particles of steel slag powder refer to the discharge of steel slagGrinding in ball mill, and drying to obtain powder with specific surface area not less than 480 m2/kg。
The portland cement has a mark number of not less than 42.5R.
The fly ash is II-grade fly ash, and the specific surface area of the fly ash is not less than 420 m2/kg。
The building waste aggregate is the aggregate with the particle size of 1-5 mm, which is obtained by sorting, crushing and screening bricks, stones and concrete waste in the building waste. The preparation method comprises the following specific steps:
the method comprises the steps of sorting waste materials such as bricks, stones and concrete in the construction waste, then carrying out three-section type crushing, namely coarse crushing (jaw crushing and gyratory crushing), medium crushing (cone crushing) and fine crushing (cone crushing), conveying the crushed construction waste into a circular vibrating screen by using a belt conveyor for screening, conveying the construction waste with the crushing particle size of below 5mm into a storage bin, and returning the construction waste with the crushing particle size of above 5mm into fine crushing equipment for crushing again.
The construction waste refers to residue soil, waste material, residual mud and the like generated in the process of building, construction, pipe network and the like, laying or dismantling and repairing.
The use method of the grouting material comprises the following steps:
the grouting method includes the steps that grouting holes are constructed in the grouting range of a collapse area, the grouting holes are vertical holes, the depth is 5m below the depth range of the collapse area, and the grouting interval is 25-35 m.
The grouting material is prepared from the following components in percentage by weight: water = 1: 0.5, and after uniformly stirring, conveying the mixture into a grouting drill hole through a grouting pump and a grouting pipeline for grouting reinforcement. And when the grouting pressure of the grouting pump is 4-6 MPa, stopping grouting, and finishing the grouting work of the grouting hole.
Embodiment 1 a grouting material for treatment of a subsidence area, which is prepared by uniformly mixing the following raw materials in percentage by mass and drying until the water content is 2%: 45 kg of mineral powder particles, 8 kg of steel slag powder particles, 15 kg of Portland cement, 1 kg of anhydrous sodium sulphate, 6 kg of fly ash and 25 kg of construction waste aggregate.
Wherein: the mineral powder and the steel slag come from steel works in Hanzhong province. MineThe powder particles are prepared by placing slag into a ball mill for grinding and drying, and the specific surface area of the powder particles is 475 m2In terms of/kg. The steel slag powder particles are prepared by grinding and drying steel slag in a ball mill, and the specific surface area of the steel slag powder particles is 490 m2/kg。
The portland cement has a mark number of not less than 42.5R. The Portland cement comes from a nearby cement plant and has a specific surface area of 410 m2/kg。
The fly ash is taken from a nearby power plant and meets the standard requirement of the class II fly ash after being checked. The specific surface area is measured to be 420 m2/kg。
The obtained grouting material is applied to the treatment of a certain coal mine subsidence area in Shaanxi:
the subsidence area is characterized in that the subsidence of different degrees is generated on the earth surface due to early coal mining, the subsidence is continuously generated along with the time, and the subsidence rate in the range of the subsidence area is 10-30 cm/month according to the monitoring of the subsidence of the earth surface. The goaf of the section is mined in a small coal mine in multiple layers, the stratum at the upper part of the goaf mainly consists of sea-land alternate sediments of a fourth system, a second system and a stone-charcoal system, and lithology mainly is the alternate layer of soft rock and a coal bed and is accompanied with tensile fault development. The area of the entire collapse zone was 5.2 square kilometers. With the development of local economy, the available land resources in cities are increasingly tense, and the land resources in the subsidence area need to be developed for the development of low-rise commercial residences, so that governments need to comprehensively treat the subsidence area to meet the requirements of building the residences.
Adding 0.5 kg of water into 1 kg of grouting material for mixing, fully stirring in stirring equipment for not less than 10min, and after uniformly stirring, conveying the mixture into a grouting drill hole through a grouting pump and a grouting pipeline for grouting reinforcement. And when the grouting pressure of the grouting pump is 4-6 MPa, stopping grouting, and finishing the grouting work of the grouting hole.
Sampling the grouting slurry after stirring, determining the coagulation time and strength index of the filling slurry, and mixing the grouting slurry with the grouting material adopted in the present stage, namely cement and fly ash, according to the weight ratio of 0.3:0.7, then mixed with water in a ratio of 1:1, the results are shown in table 1:
table 1 comparative test results
The comparison result shows that all performance indexes of the grouting of the invention are greatly superior to those of cement and fly ash.
The core of a collapse area injected layer after grouting by the grouting material is drilled and sampled, and the unconfined compressive strength is tested, wherein the average coring result 28d has the strength of 12.21MPa, and meets the standard requirement. And (5) carrying out single-hole detection on the wave velocity, and detecting that the shear wave velocity value of the injected layer is 350m/s, so that the specification requirement is met.
The ground surface of the subsidence area is provided with a plurality of displacement monitoring stations, the ground surface displacement after grouting reinforcement is monitored for a long time, the monitoring result shows that the ground surface displacement is reduced by 99% after grouting reinforcement, and vertical displacement does not occur basically.
In addition, compared with the grouting material formed by cement and fly ash, the grouting material has the same cost reduced by 65%; meanwhile, solid wastes such as slag, steel slag, fly ash and the like are utilized and consumed, a large amount of local construction wastes are also consumed, and good economic and environmental benefits are obtained.
Embodiment 2 a grouting material for treatment of a subsidence area, which is prepared from the following raw materials in percentage by mass: 20kg of mineral powder particles, 10 kg of steel slag powder particles, 5 kg of Portland cement, 3 kg of anhydrous sodium sulphate, 12 kg of fly ash and 50 kg of construction waste aggregate.
Embodiment 3 a grouting material for treatment of a subsidence area, which is prepared from the following raw materials in percentage by mass: 38 kg of mineral powder particles, 5 kg of steel slag powder particles, 10 kg of Portland cement, 2 kg of anhydrous sodium sulphate, 25 kg of fly ash and 20kg of construction waste aggregate.
Embodiment 4 a grouting material for treatment of a subsidence area, which is prepared from the following raw materials in percentage by mass: 35 kg of mineral powder particles, 5 kg of steel slag powder particles, 10 kg of Portland cement, 1 kg of anhydrous sodium sulphate, 5 kg of fly ash and 44 kg of building waste aggregate.
Claims (6)
1. A grouting material for treatment of a subsidence area is characterized in that: the grouting material is prepared by uniformly mixing the following raw materials in percentage by mass and drying until the water content is lower than 5 percent: 20-45% of mineral powder particles, 5-10% of steel slag powder particles, 5-15% of Portland cement, 1-3% of anhydrous sodium sulphate, 5-25% of fly ash and 20-50% of construction waste aggregate.
2. The grouting material for treating the subsidence area as claimed in claim 1, wherein: the specific surface area of the mineral powder particles is not less than 450 m2/kg。
3. The grouting material for treating the subsidence area as claimed in claim 1, wherein: the specific surface area of the steel slag powder particles is not less than 480 m2/kg。
4. The grouting material for treating the subsidence area as claimed in claim 1, wherein: the portland cement has a mark number of not less than 42.5R.
5. The grouting material for treating the subsidence area as claimed in claim 1, wherein: the fly ash is II-grade fly ash, and the specific surface area of the fly ash is not less than 420 m2/kg。
6. The grouting material for treating the subsidence area as claimed in claim 1, wherein: the building waste aggregate is the aggregate with the particle size of 1-5 mm, which is obtained by sorting, crushing and screening bricks, stones and concrete waste in the building waste.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110520304.0A CN113277797A (en) | 2021-05-13 | 2021-05-13 | Grouting material for treating subsidence area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110520304.0A CN113277797A (en) | 2021-05-13 | 2021-05-13 | Grouting material for treating subsidence area |
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| Publication Number | Publication Date |
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| CN113277797A true CN113277797A (en) | 2021-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110520304.0A Pending CN113277797A (en) | 2021-05-13 | 2021-05-13 | Grouting material for treating subsidence area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277796A (en) * | 2021-05-13 | 2021-08-20 | 西北矿冶研究院 | Deep soft rock roadway side wall grouting reinforcement material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8516599D0 (en) * | 1985-07-01 | 1985-08-07 | Mitsubishi Mining & Cement Co | Filling & solidifying grout slurry in coal pit |
| CN108609964A (en) * | 2018-07-26 | 2018-10-02 | 成都理工大学 | A kind of goaf grouting filler |
| CN112250395A (en) * | 2020-10-27 | 2021-01-22 | 西北矿冶研究院 | Broken rock stratum roadway wall thickness grouting material and preparation method thereof |
| US20210070660A1 (en) * | 2018-11-29 | 2021-03-11 | Chang'an University | Economical high-strength quick-hardening grouting material and grouting reinforcement method for soft rock tunnel |
-
2021
- 2021-05-13 CN CN202110520304.0A patent/CN113277797A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8516599D0 (en) * | 1985-07-01 | 1985-08-07 | Mitsubishi Mining & Cement Co | Filling & solidifying grout slurry in coal pit |
| CN108609964A (en) * | 2018-07-26 | 2018-10-02 | 成都理工大学 | A kind of goaf grouting filler |
| US20210070660A1 (en) * | 2018-11-29 | 2021-03-11 | Chang'an University | Economical high-strength quick-hardening grouting material and grouting reinforcement method for soft rock tunnel |
| CN112250395A (en) * | 2020-10-27 | 2021-01-22 | 西北矿冶研究院 | Broken rock stratum roadway wall thickness grouting material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 于洋等: ""工业固体废弃物注浆充填材料制备及应用研究"", 《煤炭技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277796A (en) * | 2021-05-13 | 2021-08-20 | 西北矿冶研究院 | Deep soft rock roadway side wall grouting reinforcement material |
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Application publication date: 20210820 |