CN111268941A - Novel organic polymer double-liquid type grouting material for coal mine reinforcing coal rock mass - Google Patents
Novel organic polymer double-liquid type grouting material for coal mine reinforcing coal rock mass Download PDFInfo
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/18—Polyesters; Polycarbonates
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
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- 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
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- 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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Abstract
The invention relates to the technical field of coal rock mass reinforcement, in particular to a novel organic polymer double-liquid type grouting material for reinforcing coal rock mass in a coal mine, which can improve the stability of the coal rock mass and reduce roof fall accidents in the coal mining process; the composite material consists of a component A and a component B, wherein the component A comprises an additive, a combined polyol and an ether high molecular compound, the component B comprises a polymethylene polyester high molecular compound, the additive comprises a reinforcing agent, an expanding agent, a flame retardant, a catalyst and a stabilizer, and the component A and the component B are injected into a crushed coal rock body through a special pneumatic injection pump and a mixing gun to rapidly perform chemical reaction and are cemented and solidified with the coal rock body to generate a high-strength expansion consolidated body, so that the aim of reinforcement or plugging can be fulfilled.
Description
Technical Field
The invention relates to the technical field of coal-rock mass reinforcement, in particular to a novel organic polymer double-liquid type grouting material for reinforcing coal rocks in a coal mine.
Background
China is one of the most abundant countries of coal resources in the world, China has thousands of years of history of utilizing coal, and is one of the earliest countries of finding and utilizing coal in the world, coal mines are areas where people mine coal resources in coal-rich mining areas and are generally divided into underground coal mines and open coal mines, and when a coal seam is far away from the ground surface, a roadway is generally selected to be excavated to the underground to mine the coal mines; when the coal bed is very close to the earth surface, the coal is generally excavated by directly stripping the earth surface soil layer, namely an open pit coal mine; the vast majority of coal mines in China belong to underground coal mines, and the coal mine range comprises a large area of underground and overground and related facilities.
Coal mines are reasonable spaces excavated by human beings when geological layers rich in coal are excavated, generally comprise roadways, wells, excavation surfaces and the like, the coal is the most important solid fuel, is one of combustible organic rocks, is formed by gradually piling luxuriant plants growing in certain geological times in a thick layer in a proper geological environment, is buried in water bottom or silt, and is subjected to the natural coalification effect of long geological times, most coal is produced in stratums of stone carbon, second-fold, Jurassic and third-class in all geological times of the world, and is an important coal-forming era, the carbon content of the coal is generally 46-97%, the coal is brown to black and has dull to metallic luster, and the coal can be divided into four classes of lignite, bituminous coal and anthracite coal according to the coal gasification degree.
The roof disaster is the most common and most easy accident in coal mines, in five disasters (coal dust, water, fire, gas and roof) in coal mines, the roof accident is the first of all accidents in coal mines, the roof rock layer on the coal seam loses support along with the mining of a working face, the original pressure balance is damaged, the coal seam roof is deformed and damaged under the action of overlying rock layer pressure, and if the support is not timely or the support strength is not enough, the roof rock layer on the working face is easily broken and falls to cause casualties and property and equipment loss, so the roof accident is the roof fall accident.
Along with the continuous increase of the coal mining scale and the mining depth in China, coal mine safety production and mine disaster control are more and more concerned, so that the problem that how to improve the stability of coal and rock masses and reduce roof fall accidents in the coal mining process is needed to be solved urgently.
Disclosure of Invention
In order to solve the technical problems, the invention provides the novel organic polymer double-liquid type grouting material for the coal mine reinforced coal rock mass, which can improve the stability of the coal rock mass and reduce roof fall accidents in the coal mining process.
The invention discloses a novel organic polymer double-liquid type grouting material for coal mine reinforced coal rock mass, which consists of a component A and a component B, wherein the component A comprises an additive, a combined polyol and an ether polymer compound, the component B comprises a polymethylene polyester polymer compound, and the additive comprises a reinforcing agent, an expanding agent, a flame retardant, a catalyst and a stabilizer.
The invention discloses a novel organic polymer double-liquid type grouting material for coal mine reinforced coal rock mass, which comprises the following raw materials in parts by weight:
1-2 parts of an additive;
48 to 49 parts of a combination polyol and an ether polymer compound.
The novel organic polymer double-liquid type grouting material for coal mine reinforced coal rock mass is characterized in that the mixing ratio of a reinforcing agent, an expanding agent, a flame retardant, a catalyst and a stabilizer in an additive is 1:2:1:1: 2.
The novel organic polymer two-liquid type grouting material for coal mine reinforced coal rock mass has the viscosity of the component A being 280-300 mpa.s measured at 25 ℃, and the viscosity of the component B being 150-200 mpa.s measured at 25 ℃.
The density of the component A measured at 25 ℃ is 1.1-1.2 g/cm3The viscosity of the component B is 1.2 to 1.3g/cm measured at 25 DEG C3。
The novel organic polymer two-liquid type grouting material for coal mine reinforced coal rock mass is characterized in that the mixing ratio of the component A to the component B is 1:1 when the component A and the component B are mixed for use.
The invention relates to a novel organic polymer two-liquid type grouting material for coal mine reinforced coal rock mass, wherein a mixing method of a component A and a component B in use comprises the following steps: firstly, adding the component A into a pulp suction barrel, fully stirring and uniformly mixing the component A, then pumping out the component A by using a pneumatic grouting pump after uniformly mixing, and mixing the component A and the component B according to the proportion of 1:1 for use.
The novel organic polymer double-liquid type grouting material for coal mine reinforced coal rock mass has the storage temperature of 5-30 ℃ and the storage period of 90 days.
The invention discloses a novel organic polymer double-liquid type grouting material for coal mine reinforced coal rock mass, which comprises the following steps when in use:
(1) moving the component A, the component B and a pneumatic pump to the underground of the coal mine;
(2) preparing a construction site and preparing construction equipment;
(3) preparing an air source, water and a cleaning agent, and simultaneously checking the states of a high-pressure pipe, a pneumatic pump and a mixer;
(4) punching a part to be filled, connecting equipment and flushing the equipment;
(5) grouting and sealing holes;
(6) hole-changing grouting, flushing pipelines and mixers;
(7) after filling, cleaning the pneumatic pump and the mixer by using a cleaning agent;
(8) and after the construction is finished, closing the air source and cleaning the site.
Compared with the prior art, the invention has the beneficial effects that: the component A and the component B of the invention are injected into the broken coal rock mass through a special pneumatic grouting pump and a mixing gun, then the chemical reaction is rapidly carried out, and the broken coal rock mass is cemented and solidified to generate a high-strength expansion consolidation body, the compressive strength of the high-strength expansion consolidation body is more than or equal to 55Mpa, and the compressive strength of the high-strength expansion consolidation body is more than or equal to 3.0Mpa, so that the purpose of reinforcement or plugging can be achieved, the stability of the coal rock mass can be improved and roof collapse accidents can be reduced in the coal mining process.
Drawings
FIG. 1 is a flow chart of a construction process in use of the present invention;
FIG. 2 is a schematic view of media consolidation;
FIG. 3 is a schematic diagram of the media advance strengthening and face coal wall strengthening process.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
The component A consists of 1 part by weight of additive and 49 parts by weight of combined polyol and ether high molecular compound, wherein the additive is obtained by mixing 1:2:1:1:2 of reinforcing agent, expanding agent, flame retardant, catalyst and stabilizer, the viscosity of the component A is 280mpa.s measured at 25 ℃, and the density is 1.1g/cm3；
The component B is a polymethylene polyester high molecular compound, and has a viscosity of 175mpa.s measured at 25 ℃ and a viscosity of 1.2g/cm3；
The component A and the component B are mixed for construction to carry out reinforcement treatment on the coal mine coal rock layer:
1. preparation work
1) Preparing a power compressed air source, wherein the air supply quantity is required to be more than or equal to 3m3Min, the air supply pressure is more than or equal to 0.5 Mpa;
2) wind source conveying, wherein the drift diameter of the high-pressure steel wire rubber hose is required to be phi 25, and the length of the high-pressure steel wire rubber hose is determined according to the wind source to a construction site;
3) transporting the raw materials and the pneumatic grouting pump to a construction site;
4) preparing a construction site;
5) two barrels of special cleaning agent are prepared, each barrel is 25 liters.
2. Construction step
1) The site of deployment (auxiliary article fixing, air source preparation, air pipe, cleaning agent, etc.);
2) installing a pneumatic grouting pump, a slurry suction pipe and a slurry discharge pipe thereof, and slurry suction barrels (two open iron barrels);
3) pour component A and component B into respectively two and inhale thick liquid buckets to carry out intensive mixing to component A evenly, put into two respectively and inhale thick liquid buckets with two inhale thick liquid pipes, go out thick liquid manometer control component A, open the pneumatic pump and press 1:1, pumping the component A and the component B out through two groups of slurry suction pipes, mixing the components through a slurry discharge pipe, a one-way check valve, a three-way mixer, a grouting pipe and the like, and injecting the mixture into a rock stratum (coal seam) crack;
4) after the construction is finished, cleaning the pump and the pipeline of the pneumatic grouting pump by using a special cleaning agent, and cleaning the site;
5) the pneumatic grouting pump is placed in a stable place far away from a traffic key road.
The initial setting time of the component A and the component B after mixing is 20-60 s, the final setting time is 80-180 s, after the components A and the B are mixed and injected into cracks of a coal rock layer, chemical reaction is rapidly carried out, expansion is carried out, the expansion multiple is 8 times, and the components A and the B are cemented and cured with a coal rock body to generate a high-strength expansion consolidated body, so that the aim of reinforcing or plugging is fulfilled, and after the coal rock layer is reinforced, the compressive strength is not less than 55MPa, and the compressive strength is not less than 3.0 MPa.
Example 2
The component A consists of 2 parts by weight of additive and 48 parts by weight of combined polyol and ether high molecular compound, wherein the additive is obtained by mixing 1:2:1:1:2 reinforcing agent, expanding agent, flame retardant, catalyst and stabilizer, the viscosity of the component A is 300mpa.s measured at 25 ℃, and the density is 1.2g/cm3；
The component B is a polymethylene polyester high molecular compound, and has a viscosity of 175mpa.s measured at 25 ℃ and a viscosity of 1.3g/cm3；
The component A and the component B are mixed for construction to carry out reinforcement treatment on the coal mine coal rock layer:
1. preparation work
1) Preparing a power compressed air source, wherein the air supply quantity is required to be more than or equal to 3m3Min, the air supply pressure is more than or equal to 0.5 Mpa;
2) wind source conveying, wherein the drift diameter of the high-pressure steel wire rubber hose is required to be phi 25, and the length of the high-pressure steel wire rubber hose is determined according to the wind source to a construction site;
3) transporting the raw materials and the pneumatic grouting pump to a construction site;
4) preparing a construction site;
5) two barrels of special cleaning agent are prepared, each barrel is 25 liters.
2. Construction step
1) The site of deployment (auxiliary article fixing, air source preparation, air pipe, cleaning agent, etc.);
2) installing a pneumatic grouting pump, a slurry suction pipe and a slurry discharge pipe thereof, and slurry suction barrels (two open iron barrels);
3) pour component A and component B into respectively two and inhale thick liquid buckets to carry out intensive mixing to component A evenly, put into two respectively and inhale thick liquid buckets with two inhale thick liquid pipes, go out thick liquid manometer control component A, open the pneumatic pump and press 1:1, pumping the component A and the component B out through two groups of slurry suction pipes, mixing the components through a slurry discharge pipe, a one-way check valve, a three-way mixer, a grouting pipe and the like, and injecting the mixture into a rock stratum (coal seam) crack;
4) after the construction is finished, cleaning the pump and the pipeline of the pneumatic grouting pump by using a special cleaning agent, and cleaning the site;
5) the pneumatic grouting pump is placed in a stable place far away from a traffic key road.
The initial setting time of the component A and the component B after mixing is 20-60 s, the final setting time is 80-180 s, after the components A and the B are mixed and injected into cracks of a coal rock layer, chemical reaction is rapidly carried out, expansion is carried out, the expansion multiple is 15 times, and the components A and the B are cemented and cured with a coal rock body to generate a high-strength expansion consolidated body, so that the purpose of reinforcing or plugging is achieved, and after the coal rock layer is reinforced, the compressive strength is not less than 60Mpa, and the compressive strength is not less than 4.2 Mpa.
Example 3
The component A consists of 1.5 weight parts of additive and 48.5 weight parts of combined polyol and ether high molecular compound, wherein the additive is obtained by mixing 1:2:1:1:2 reinforcing agent, expanding agent, flame retardant, catalyst and stabilizer, the viscosity of the component A is 290mpa.s measured at 25 ℃, and the density is 1.1g/cm3；
The component B is a polymethylene polyester high molecular compound, and has a viscosity of 155mpa.s measured at 25 ℃ and a viscosity of 1.2g/cm3；
The component A and the component B are mixed for construction to carry out reinforcement treatment on the coal mine coal rock layer:
1. preparation work
1) Preparing a power compressed air source, wherein the air supply quantity is required to be more than or equal to 3m3Min, the air supply pressure is more than or equal to 0.5 Mpa;
2) wind source conveying, wherein the drift diameter of the high-pressure steel wire rubber hose is required to be phi 25, and the length of the high-pressure steel wire rubber hose is determined according to the wind source to a construction site;
3) transporting the raw materials and the pneumatic grouting pump to a construction site;
4) preparing a construction site;
5) two barrels of special cleaning agent are prepared, each barrel is 25 liters.
2. Construction step
1) The site of deployment (auxiliary article fixing, air source preparation, air pipe, cleaning agent, etc.);
2) installing a pneumatic grouting pump, a slurry suction pipe and a slurry discharge pipe thereof, and slurry suction barrels (two open iron barrels);
3) pour component A and component B into respectively two and inhale thick liquid buckets to carry out intensive mixing to component A evenly, put into two respectively and inhale thick liquid buckets with two inhale thick liquid pipes, go out thick liquid manometer control component A, open the pneumatic pump and press 1:1, pumping the component A and the component B out through two groups of slurry suction pipes, mixing the components through a slurry discharge pipe, a one-way check valve, a three-way mixer, a grouting pipe and the like, and injecting the mixture into a rock stratum (coal seam) crack;
4) after the construction is finished, cleaning the pump and the pipeline of the pneumatic grouting pump by using a special cleaning agent, and cleaning the site;
5) the pneumatic grouting pump is placed in a stable place far away from a traffic key road.
The initial setting time of the component A and the component B after mixing is 20-60 s, the final setting time is 80-180 s, after the components A and the B are mixed and injected into cracks of a coal rock layer, chemical reaction is rapidly carried out, expansion is carried out, the expansion multiple is 8 times, and the components A and the B are cemented and cured with a coal rock body to generate a high-strength expansion consolidated body, so that the purpose of reinforcing or plugging is achieved, and after the coal rock layer is reinforced, the compressive strength is not less than 58Mpa, and the compressive strength is not less than 3.6 Mpa.
The application examples of the organic polymer double-liquid type grouting material for reinforcing coal and rock masses of the novel coal mine in the underground coal mine mainly comprise roadway roof and wall rear reinforcement, roadway coal wall caving, coal body reinforcement of a triangular area, coal roadway advanced reinforcement, working face coal wall reinforcement and the like;
the coal body is reinforced as shown in figure 2;
coal body strengthening precautions:
① drilling parameters are determined by site geological conditions, the aperture phi is 28-phi 45mm, the hole depth is 1-6 m, and the elevation angle is 15-45 degrees;
② determining the slurry diffusion radius, grouting amount and grouting pressure according to the field condition;
③ the grouting amount is determined by the hole depth and the number of cracks penetrated by the drilled hole, and the grouting amount is increased correspondingly when the drilled hole penetrates more cracks deeper;
④ the hole replacement or grouting stop is determined by the grouting pressure (working pressure of a pneumatic pump) and the raw material seepage, and when the grouting pressure rises to about 15MPa or the grouting amount is almost the same as the seepage amount, the hole replacement or grouting stop is determined.
The advance reinforcing process of the coal roadway and the reinforcing process of the coal wall of the working face are shown in figure 3;
advanced reinforcement considerations:
① the drilling parameters are determined by the field conditions;
② grouting amount is determined by coal seam fracture condition and hole distribution parameters;
③ paying attention to the opening force of the coal seam closed fracture, when the grouting pressure reaches a rated value, the hole replacement and grouting stop are determined according to the field situation;
④ the cloth holes should be taken into account at the shoulder because the cloth holes can prevent or reduce the occurrence of rib stripping.
In order to ensure the construction quality of chemical grouting and the safety of construction operation, the operation rules of the special design are made. Any person involved in grouting must be familiar with the protocol and ensure strict adherence in actual work.
1) Protective articles such as protective glasses, masks, rubber gloves and the like must be worn by grouting personnel during construction;
2) before construction, the construction site needs to knock the top, and after removing floating gangue dangerous rocks at the top and the side, drilling and grouting construction are carried out. When drilling holes at a high place and installing a grouting pipe, a stable and firm workbench needs to be built, a support needs to be firm, and people need to observe the support;
3) the front surface of the grouting pipe cannot face when the grouting pipe is operated, and the grouting valve needs to be opened after the pulse pressure in the grouting pipe is released;
4) people irrelevant to grouting and observers in front of grouting need to observe remotely outside a grouting reinforcement area by 10m, wear corresponding protective articles and contact with pumping personnel at any time;
5) a pumpersee must strictly observe the pump pressure all the time, pay attention to the pump condition and contact with a front observer at any time, and once abnormal conditions such as coal wall looseness, slurry leakage (slurry leakage) and sudden drop of grouting pressure are discovered, grouting should be stopped immediately, reasons are found out, and grouting construction is allowed to be recovered after measures are taken;
6) slurry preparation personnel should keep the slurry not to suck empty, observe the slurry sucking condition of the pump at any time and keep the mixture ratio of the two slurries to be moderate;
7) non-professional personnel cannot operate a grouting pump and a pulping machine so as to avoid accidents;
8) a certain amount of cleaning water is required to be provided in a working place, if serous fluid is carelessly splashed into skin or eyes, a large amount of clear water is required to be used for washing immediately, a serious person needs to seek medical treatment immediately, and a human body cannot contact with a chemical grouting material;
9) when the operations such as drilling, pipe burying, hole sealing, pipe connection and the like are carried out, the safety condition around the operation, particularly the maintenance condition of a head-on top plate, is required to be checked in advance, and the operation against the regulations cannot be carried out;
10) the connecting piece at the high-pressure end of the whole grouting system must be firmly connected by a regular connecting pin;
11) after grouting, cleaning the pipeline with clear water or engine oil immediately, and arranging the pumps, the pipelines and the like in order;
12) various materials which are easy to be affected with moisture need to have waterproof and moistureproof measures;
13) during grouting operation, the system needs to avoid or cover obstacles such as pipelines;
14) the pipeline hanging and material stacking on the construction site are orderly and orderly, and the cleaning is clean, so that the civilized production is well realized;
15) when other operations are carried out on site, grouting personnel stop operating, hide in a safety zone, and carry out construction after safety;
16) any person participating in grouting must be familiar with the operation regulations and operation regulation requirements related to the reinforced site, familiar with disaster avoidance routes and guaranteed to strictly comply with the actual work;
17) and (4) executing according to related terms of coal mine safety regulations, related operation regulations of mine prescription and operation regulations to the extent of inexhaustibility.
With the increasing of the coal mining scale and the mining depth in China, the demand of a coal mine production site on the variety of the grouting reinforcement material is increased day by day, and with the continuous development of the polymer material synthesis technology in China, the performance of the organic polymer double-liquid type grouting material product for the novel coal mine reinforcement coal rock body is further optimized, the product cost is further reduced, and the application of the organic polymer double-liquid type grouting material product in coal mine safety production and mine disaster control is more and more extensive.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The novel organic polymer double-liquid type grouting material for reinforcing coal and rock masses in coal mines is characterized by comprising a component A and a component B, wherein the component A comprises an additive, a combined polyol and an ether polymer compound, the component B comprises a polymethylene polyester polymer compound, and the additive comprises a reinforcing agent, an expanding agent, a flame retardant, a catalyst and a stabilizer.
2. The novel organic polymer two-liquid type grouting material for the coal mine reinforced coal rock mass as claimed in claim 1, wherein the component A comprises the following raw materials in parts by weight:
1-2 parts of an additive;
48 to 49 parts of a combination polyol and an ether polymer compound.
3. The novel organic polymer two-liquid type grouting material for reinforcing coal and rock mass in coal mines as claimed in claim 1, wherein the mixing ratio of the reinforcing agent, the expanding agent, the flame retardant, the catalyst and the stabilizer in the additive is 1:2:1:1: 2.
4. The novel organic polymer two-liquid type grouting material for the coal mine reinforced coal rock mass as claimed in claim 1, wherein the viscosity of component A is 280-300 mpa.s measured at 25 ℃, and the viscosity of component B is 150-200 mpa.s measured at 25 ℃.
5. The novel organic polymer two-liquid type grouting material for coal mine reinforced coal rock mass as claimed in claim 1, wherein the density of the component A is 1.1-1.2 g/cm measured at 25 ℃3The viscosity of the component B is 1.2 to 1.3g/cm measured at 25 DEG C3。
6. The novel organic polymer two-liquid type grouting material for the coal mine reinforced coal rock mass as claimed in claim 1, wherein the mixing ratio of the component A and the component B is 1:1 when the components are mixed for use.
7. The novel organic polymer two-liquid type grouting material for the coal mine reinforced coal rock mass as claimed in claim 1, wherein the mixing method of the component A and the component B in use is as follows: firstly, adding the component A into a pulp suction barrel, fully stirring and uniformly mixing the component A, then pumping out the component A by using a pneumatic grouting pump after uniformly mixing, and mixing the component A and the component B according to the proportion of 1:1 for use.
8. The novel organic polymer two-liquid type grouting material for the coal mine reinforced coal rock mass as claimed in claim 1, wherein the storage temperature is 5-30 ℃, and the storage period is 90 days.
9. The novel organic polymer two-liquid type grouting material for the coal mine reinforced coal rock mass as claimed in claim 1, characterized by comprising the following steps in use:
(1) moving the component A, the component B and a pneumatic pump to the underground of the coal mine;
(2) preparing a construction site and preparing construction equipment;
(3) preparing an air source, water and a cleaning agent, and simultaneously checking the states of a high-pressure pipe, a pneumatic pump and a mixer;
(4) punching a part to be filled, connecting equipment and flushing the equipment;
(5) grouting and sealing holes;
(6) hole-changing grouting, flushing pipelines and mixers;
(7) after filling, cleaning the pneumatic pump and the mixer by using a cleaning agent;
(8) and after the construction is finished, closing the air source and cleaning the site.
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