CN112174616B - Underground consolidation material and method for loose coal rock mass in small kiln damage area - Google Patents
Underground consolidation material and method for loose coal rock mass in small kiln damage area Download PDFInfo
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- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims abstract description 8
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Classifications
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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
- C04B28/06—Aluminous 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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
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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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to the technical field of coal-rock mass consolidation, in particular to a loose coal-rock mass underground consolidation material in a small kiln damage area, wherein in a grouting material I, 55-60 parts of calcium sulphoaluminate cement, 38-43 parts of fly ash, 0.8-1.5 parts of sodium carbonate, 0.4-0.8 part of calcium sulfate and 0.2-0.5 part of calcium oxide are used as a component A; the component B comprises 35 to 45 percent of potassium diatomate and 55 to 65 percent of stannous octoate; the component A and the component B are mixed according to the volume ratio of 1:1 for use. In the grouting material II, the component C comprises the following components in parts by weight: 55-65 parts of clay, 30-37 parts of cement, 3-5 parts of coal gangue powder and 0.7-1.5 parts of gypsum; the component D is a mixture of 35 to 45 percent of accelerating agent, 35 to 45 percent of catalyst and 15 to 25 percent of suspending agent; the component C and the component D are mixed according to the volume ratio of 1:1 for use. The loose coal rock mass is consolidated, the bearing capacity of the roadway and the lateral supporting capacity of surrounding rocks are improved through reinforcement, and the safe and efficient tunneling and the recovery of the roadway and the working face in the later period are ensured. The invention also provides a loose coal rock mass underground consolidation method in the small kiln damage area.
Description
Technical Field
The invention relates to the technical field of coal-rock mass consolidation, in particular to a loose coal-rock mass underground consolidation material in a small kiln damage area and a consolidation method.
Background
Mine fire is one of main disasters threatening mine safety production in China, and 90% of underground coal fire in China belongs to small kiln destruction type according to incomplete statistics. Wherein the small kiln fire in the mine areas of Shanxi, Xinjiang, inner Mongolia and the like is widely distributed. The most direct consequence of the method is that the mining rate is low, which results in huge waste of coal resources, and the defects of mining disorder, incomplete data, disordered management and the like exist, which brings huge difficulty to the production of the integrated large-scale coal enterprises, and mainly shows the following aspects:
(1) the small coal kiln freely tunnels and mines in the coal seam to form a large number of criss-cross old goafs and old roadways;
(2) the mining mode with extremely low recovery rate such as roadway column type or short wall type is mostly adopted, and the top plate and the surrounding rocks in the goaf are not easy to collapse;
(3) the small-kiln goaf surrounding rock cracks develop, and the phenomena of roof leakage, wall caving, goaf collapse and the like are easily generated under the influence of mining, so that a large-range loose coal rock body is formed.
When the mine is excavated and passes through the small-kiln to mine the severe damage zone, receive complicated geological structure, the tectonic stress, the influence of factors such as supporting construction and parameter and water fluid dynamic action, loose coal rock mass on a large scale threatens the mining operation greatly, coal rock mass wholeness and original equilibrium state suffer destruction, coal rock mass appears different degree deformation and accompanies a large amount of energy release, weak face and fracture in the coal rock mass can further develop simultaneously, coal rock mass becomes not hard up, the inflation, come to press strong, it is broken, the deflection is big, the rheological time is long, present current coal rock mass stability control technique has some insurmountable drawbacks more, especially when mining the severe damage zone through the small-kiln, wherein:
(1) the traditional arch body support has the defects of complex construction process, high cost, limited adaptability and the like;
(2) the rigid support is only suitable for use places such as stable laneways, small roof pressure and the like;
(3) various kinds of flexible metal supports mainly made of U-shaped steel have high cost, and most flexible metal supports are easy to deform and damage due to poor construction quality, so that the pressure bearing effect is gradually lost;
(4) the anchor rod and anchor cable supporting technology cannot be well adapted to high stress, large deformation, roof fall, broken surrounding rock and roadways affected by mining.
In conclusion, the coal industry in China currently lacks a loose coal rock mass consolidation method based on the characteristic research of coal rock mass deformation damage instability.
Disclosure of Invention
In order to solve the problems, the invention provides a loose coal rock mass underground consolidation material in a small kiln damage area, which is used for consolidating the loose coal rock mass, effectively improving the stress structure and performance of a working face, a top plate and a surrounding rock, simultaneously improving the bearing capacity of a roadway and the lateral supporting capacity of the surrounding rock, ensuring the safe and efficient tunneling and recovery of the roadway and the working face at the later stage, reducing the repair rate of the roadway and reducing the maintenance cost of the roadway. The invention also provides a loose coal rock mass underground consolidation method in the small kiln damage area.
In order to achieve the purpose, the invention adopts the technical scheme that:
in the first technical scheme, the underground consolidation material of the loose coal rock mass in the small kiln damage area is a No. I grouting material which comprises a component A and a component B, wherein,
the component A comprises the following components in parts by weight: 55-60 parts of calcium sulphoaluminate cement, 38-43 parts of fly ash, 0.8-1.5 parts of sodium carbonate, 0.4-0.8 part of calcium sulfate and 0.2-0.5 part of calcium oxide;
the component B comprises 35 to 45 percent of potassium diatomate and 55 to 65 percent of stannous octoate;
the component A and the component B are mixed according to the volume ratio of 1: 1.
In the first technical scheme, the component A preferably comprises the following components in parts by weight: 57 parts of calcium sulphoaluminate cement, 41 parts of fly ash, 1 part of sodium carbonate, 06 parts of calcium sulfate and 0.4 part of calcium oxide; the component B comprises 40% of potassium diatomate and 60% of stannous octoate.
In the second technical proposal, the underground consolidation material of the loose coal rock mass in the small kiln damage area is a No. II grouting material which comprises a component C and a component D, wherein,
the component C comprises the following components in parts by weight: 55-65 parts of clay, 30-37 parts of cement, 3-5 parts of coal gangue powder and 0.7-1.5 parts of gypsum;
the component D is a mixture of 35 to 45 percent of accelerating agent, 35 to 45 percent of catalyst and 15 to 25 percent of suspending agent;
the component C and the component D are mixed according to the volume ratio of 1: 1.
In the second technical scheme, preferably, the accelerating agent is sodium gluconate-tripropylene alcohol, the catalyst is triethylene diamine, and the suspending agent is zircon powder.
In the second technical scheme, the component C preferably comprises the following components in parts by weight: 60 parts of clay, 35 parts of cement, 4 parts of coal gangue powder and 1 part of gypsum; the component D is a mixture of 40 percent of accelerating agent, 40 percent of catalyst and 20 percent of suspending agent.
In a third aspect, a method for consolidating loose coal rock mass downhole in a small-kiln failure zone, using the loose coal rock mass downhole consolidation material in a small-kiln failure zone as in the first aspect, and using the loose coal rock mass downhole consolidation material in a small-kiln failure zone as in the second aspect, comprises the steps of:
step 1, drilling a plurality of upward roof deep grouting holes and shallow slab deep grouting holes in a roof at the front end of a roadway, and drilling roadway upper side holes and roadway lower side holes in two sides of the roadway; drilling a top plate deep grouting hole and a top plate shallow grouting hole on the top of the roadway;
and (5) repeating the step 1 to the step 3 to finish the underground consolidation and the roadway tunneling of the loose coal rock mass in the small-kiln mining damage area.
In the third aspect, it is preferable that the punching position and angle of the top plate deep grouting hole are as follows:
the first top plate deep grouting hole is spaced from the roadway side by a distance L2The position forms an included angle theta with the trend of the roadway and a tilted included angle beta with the roadway;
a second top plate deep grouting hole which is 2L away from the first top plate deep grouting hole1The included angle theta between the position and the trend of the roadway and the included angle 90 degrees between the position and the trend of the roadway are included, and the second top plate deep grouting hole is positioned in the middle of the trend of the roadway;
a third top plate deep grouting hole which is 2L away from the second top plate deep grouting hole1The position of the inclined angle theta is inclined to the roadway, and the inclined angle beta is inclined to the roadway.
In the third aspect, preferably, the punching positions and angles of the top plate shallow grouting holes are as follows:
the first top plate shallow grouting hole is L away from the top plate deep grouting hole in the front end trend of the roadway top plate3Position, inclined upper distance lane slope L1+L2The position forms an included angle theta with the trend of the roadway;
a second shallow roof grouting hole 2L apart from the first shallow roof grouting hole along the roadway1The position and the heading of the roadway form an included angle theta;
the included angles between the first top plate shallow grouting hole and the roadway inclination angle between the second top plate shallow grouting hole and the roadway inclination angle are both 90 degrees.
In the third technical solution, preferably, the punching positions and angles of the lateral holes at the upper part of the roadway and the lateral holes at the lower part of the roadway are as follows:
side holes at the upper part of the roadway: the distance h between the deep grouting holes and the top plate of the tunnel is arranged on the same cross section of the deep grouting holes on two sides of the tunnel1The included angle alpha is formed between the position and the horizontal direction;
side holes at the lower part of the roadway: the distance h from the opening position of the side hole at the upper part of the roadway to the direction of the roadway bottom plate is arranged on the same cross section of the two sides of the roadway and the deep grouting hole2And the angle alpha is formed with the horizontal direction.
In a third technical scheme, preferably, the heading included angle between the top plate deep grouting hole and the roadway is the same as the heading included angle theta between the top plate shallow grouting hole and the roadway.
The beneficial effects of the invention are as follows:
the technology of the patent obviously improves the mechanical structure and performance of the loose coal rock mass, improves the bearing capacity of a roadway top plate and the lateral supporting capacity of surrounding rocks, overcomes the defects of long ground drilling construction distance, easy dislocation of a drill rod and long time in a downhole close-distance drilling grouting mode, creates favorable conditions for subsequent mine roadway tunneling, makes up the defects of large construction amount, poor construction environment, high labor intensity of workers, long construction period and the like of the existing temporary supporting technology of a wedge, a pipe shed, an I-shaped steel shed, a metal net and a steel strip and the like, does not need to operate in a caving dangerous area, ensures the safety of field operation, reduces the repair rate and the maintenance cost of the roadway, the economic benefit of the coal mine is improved.
Drawings
FIG. 1 is a schematic diagram of the arrangement of grouting holes in the cross section of a roadway when the method for consolidating loose coal and rock mass in a small kiln damage area is implemented.
Fig. 2 is a sectional view taken along line a-a of fig. 1.
Fig. 3 is a sectional view taken along line B-B of fig. 1.
The reference numerals include:
in the figure: 1-laneway; 2-side holes at the upper part of the roadway; 3-side holes at the lower part of the roadway; 4-top plate deep grouting holes; 5-grouting holes on the shallow part of the top plate; 6-loose coal-rock area; 7-top-off region.
Detailed Description
In order to make the purpose, technical solution and advantages of the present technical solution more clear, the present technical solution is further described in detail below with reference to specific embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present teachings.
Example 1
A loose coal rock mass underground consolidation material in a small kiln damage area is a No. I grouting material, the No. I grouting material comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 55-60 parts of calcium sulphoaluminate cement, 38-43 parts of fly ash, 0.8-1.5 parts of sodium carbonate, 0.4-0.8 part of calcium sulfate and 0.2-0.5 part of calcium oxide; the component B comprises 35 to 45 percent of potassium diatomate and 55 to 65 percent of stannous octoate; the component A and the component B are mixed according to the volume ratio of 1: 1.
Preferably, the component A comprises the following components in parts by weight: 57 parts of calcium sulphoaluminate cement, 41 parts of fly ash, 1 part of sodium carbonate, 06 parts of calcium sulfate and 0.4 part of calcium oxide; the component B comprises 40% of potassium diatomate and 60% of stannous octoate.
A loose coal rock mass underground consolidation material in a small kiln damage area is a No. II grouting material, and the No. II grouting material comprises a component C and a component D, wherein the component C comprises the following components in parts by weight: 55-65 parts of clay, 30-37 parts of cement, 3-5 parts of coal gangue powder and 0.7-1.5 parts of gypsum; the component D is a mixture of 35 to 45 percent of accelerating agent, 35 to 45 percent of catalyst and 15 to 25 percent of suspending agent; the component C and the component D are mixed according to the volume ratio of 1: 1.
Preferably, the accelerating agent is sodium gluconate-tripropylene alcohol, the catalyst is triethylene diamine, and the suspending agent is zircon powder. Preferably, the component C comprises the following components in parts by weight: 60 parts of clay, 35 parts of cement, 4 parts of coal gangue powder and 1 part of gypsum; the component D is a mixture of 40 percent of accelerating agent, 40 percent of catalyst and 20 percent of suspending agent.
Specifically, the No. I grouting material is a two-component expansion foaming flame-retardant material and mainly utilizes the expansion filling characteristic, wherein the main components of the component A are calcium sulphoaluminate cement, fly ash, sodium carbonate, calcium sulfate and calcium oxide. Wherein, the calcium sulphoaluminate cement, the fly ash, the sodium carbonate, the calcium sulfate and the calcium oxide are respectively as follows in parts by weight in the component A: 58 parts, 40 parts, 1.1 parts, 0.55 part and 0.45 part. The component B mainly comprises potassium diatomate and stannous octoate, wherein the potassium diatomate and the stannous octoate in the component B respectively comprise the following components in percentage by mass: 40% and 60%. A. The two components B are mixed according to the volume ratio of 1:1, during grouting, the A, B material after mixing is fully mixed with water with the same volume, can quickly react to generate foam and quickly expand to 2-5 times of the volume, and after expansion, the mixture is hardened within a few minutes, and the compressive strength reaches about 0.3MPa after 20min of hardening.
The No. II grouting material is also a two-component organic mineral resin material and mainly utilizes the penetration consolidation characteristic of the two-component organic mineral resin material, wherein the component C mainly comprises clay, cement, coal gangue powder and gypsum, and the weight parts of the clay, the cement, the coal gangue powder and the gypsum in the component C are respectively as follows: 61 parts, 36 parts, 4.1 parts and 1.1 parts. The component D mainly comprises sodium gluconate isopropanol, triethylene diamine and zircon powder, wherein the sodium gluconate isopropanol, the triethylene diamine and the zircon powder respectively comprise the following components in percentage by mass: 40 percent, 40 percent and 20 percent, the two components are mixed according to the volume ratio of 1:1, during grouting, C, D material after mixing is fully mixed by water with the same volume, block polymer is generated by rapid reaction, the polymer can penetrate cracks and gaps to be solidified after entering coal rock mass, and is highly bonded with the coal rock mass, so that loose broken coal rock mass is bonded into a whole, and the material does not expand in water, does not react with water, has good bonding property in a moist coal rock layer, can penetrate gaps with width of more than 0.14mm, has super-strong permeability, short reaction time and controllability, has the reaction temperature of less than 99 ℃, and is flame-retardant and antistatic.
Example 2
As shown in fig. 1-3, the method for consolidating loose coal rock mass in small-kiln damage area under well in the embodiment uses the loose coal rock mass consolidation materials in small-kiln damage area, i.e. grouting material i and grouting material ii, as proposed in embodiment 1, and comprises the following steps:
step 1, drilling a plurality of upward roof deep grouting holes 4 and shallow slab deep grouting holes in a roof at the front end of a roadway 1, and drilling roadway upper side holes 2 and roadway lower side holes 3 on two sides of the roadway 1; a top plate deep grouting hole 4 and a top plate shallow grouting hole 5 are punched in the top of the roadway 1, and the top plate shallow grouting hole 5 is punched in a roof caving area 7;
and (5) repeating the steps 1 to 3 to finish the underground consolidation of the loose coal rock mass in the small-kiln mining damage area and the tunneling of the roadway 1.
Specifically, the punching positions and angles of the top plate deep grouting holes 4 are as follows:
the first top plate deep grouting hole 4 is spaced from the roadway wall by a distance L2The position forms an included angle theta with the trend of the roadway 1 and forms an included angle beta with the trend of the roadway 1; a second top plate deep grouting hole 4 spaced 2L from the first top plate deep grouting hole 41The included angle theta between the position and the trend of the roadway 1 and the included angle between the position and the trend of the roadway 1 are 90 degrees, and the second top plate deep grouting hole 4 is positioned in the trend middle position of the roadway 1; a third top plate deep grouting hole 4 spaced 2L from the second top plate deep grouting hole 41The position of the inclined angle theta is inclined to the trend of the roadway 1, and the inclined angle beta is inclined to the roadway 1.
The punching positions and angles of the top plate shallow grouting holes 5 are as follows:
a first top plate shallow grouting hole 5 which is 4L away from the top plate deep grouting hole in the front end trend of the top plate of the roadway 13Position, inclined upper distance lane slope L1+L2The position forms an included angle theta with the trend of the roadway 1; a second shallow roof grouting hole 5 inclined at a distance 52L from the first shallow roof grouting hole along the roadway 11The position and the direction of the roadway 1 form an included angle theta; the inclined included angles between the first top plate shallow grouting hole 5 and the roadway 1 and between the second top plate shallow grouting hole 5 and the roadway 1 are both 90 degrees.
The included angle between the deep grouting hole 4 of the top plate and the roadway 1 is the same as the included angle theta between the shallow grouting hole 5 of the top plate and the roadway 1.
The punching positions and angles of the side holes 2 at the upper part of the roadway and the side holes 3 at the lower part of the roadway are as follows:
Example 3
The present example illustrates the method of consolidating loose coal rock mass downhole in a small-kiln mining failure zone in detail by combining example 1 and example 2 and referring to fig. 1-3.
Step A: designing and constructing a first circulation grouting drilling hole, which consists of a row of roadway walls, a top deep hole and a row of roadway top shallow holes and is alternately performed, wherein:
(1) the top plate deep grouting holes 4 are arranged in a row of three, and are constructed in a hole area formed after a loose coal rock mass of a top plate of a tunnel 1 in a small-kiln mining damaged area collapses, the inclination angles of the three top plate deep grouting holes 4 are all 60 degrees, the horizontal included angles of a left drilling hole, a middle drilling hole and a right drilling hole are respectively 220 degrees, 0 degrees and 70 degrees (symmetrically distributed along the direction of the tunnel 1), and the opening positions of the top plate deep grouting holes 4 on the left side and the right side are 41.2m away from the middle top plate deep grouting hole;
(2) two grouting holes 5 at the shallow part of the top plate are arranged in a row and are constructed in a loose coal-rock area 6 which is not collapsed, the hole opening position of the grouting holes is 0.5m away from the grouting hole 4 at the deep part of the top plate along the direction of the roadway 1, the inclined upper distance is 0.6m away from each of two sides of the grouting hole 4 at the deep part of the middle top plate, and the horizontal inclination angle and the azimuth angle of a drilling hole are the same as those of the grouting hole 4 at the deep part of the top plate;
(3) 1 both sides coal rock mass construction side opening in tunnel, one row is four, and each side is respectively two: the opening position of the side hole 2 at the upper part of the tunnel is 0.7m away from the top plate of the tunnel 1, and the horizontal inclination angle is 10 degrees; the opening position of the side hole 3 at the lower part of the roadway is 1.8m away from the top plate of the roadway 1, and the horizontal inclination angle is-10 degrees.
As described above, the diameter of the top plate shallow grouting hole 5 is 42mm, and the hole depth is 2.5 m; the diameter of a top plate deep grouting hole 4 is 32mm, and the hole depth is 8 m; the diameter of the side hole 2 at the upper part of the roadway and the diameter of the side hole 3 at the lower part of the roadway are 32mm, the hole depth is 5m, after the drilling construction is finished, a whole-course casing pipe is required to be laid, valves are arranged, other circulation is designed according to the rule, grouting and drilling are carried out, and the specific circulation frequency is determined by the caving range of the loose coal rock mass.
And B: transporting the No. I grouting material, the No. II grouting material and the grouting device to a safety zone near a grouting area, connecting the high-pressure rubber pipe to a grouting drill hole, and connecting the high-pressure rubber pipe with the S pipe valve through a quick connector; starting a spiral stirring part of a hopper of the grouting device while supplying water, pouring the component materials into the hopper according to the designed mixing proportion for stirring, then starting a pumping system and a hydraulic system of the grouting device, continuously feeding the fully mixed slurry materials into an S pipe under the alternate power action of two pumping oil cylinders, and finally pressing the slurry materials into a target filling area; in each cycle, the shallow part grouting holes 5 of the top plate are preferentially grouted, the deep part grouting holes 4 of the top plate are grouted later, and finally the side holes 2 at the upper part of the roadway and the side holes 3 at the lower part of the roadway are grouted. And grouting the single holes in sequence according to the sequence of firstly grouting the top plate and then grouting the surrounding rock. And filling a roof area with a grouting material I, and treating a surrounding rock area with a grouting material II.
And B, step B: and stopping injecting the materials after filling all the drill holes in the first circulation, flushing the whole grouting pipeline and the grouting pump by using clear water, and designing and constructing second circulation grouting drill holes after finishing grouting until the grouting filling of the 6 regions of the loose coal-rock body region in the mining damaged region of the whole small kiln is finished.
To clarify the meaning of some symbols in this example, the following explanation is added:
alpha, the included angle between the side hole at the upper part or the lower part of the roadway 1 and the horizontal direction;
beta, inclined included angles between the deep grouting holes 4 of the top plate and the roadway 1;
theta, forming an included angle between the deep grouting holes 4 of the top plate and the roadway 1;
h1the distance between the position of the opening of the side hole 2 at the upper part of the roadway and the top plate of the roadway 1;
h2the distance between the position of the hole of the side hole 2 at the upper part of the roadway and the position of the hole of the side hole 3 at the lower part of the roadway;
h3the distance between the position of the hole of the side hole 3 at the lower part of the roadway and the bottom plate of the roadway 1;
H. the height of a roadway 1;
L1the inclined distance of the roadway 1 is arranged between the positions of the holes formed in the top plate deep grouting holes 4 and the top plate shallow grouting holes 5;
L2distance between the top plate deep grouting hole 4 and the roadway side;
L3the heading distance of the roadway 1 is between the positions of the holes formed by the top plate deep grouting holes 4 and the top plate shallow grouting holes 5;
and the width of an L roadway 1.
The foregoing is only a preferred embodiment of the present invention, and many variations in the detailed description and the application scope will be apparent to those skilled in the art based on the spirit of the present invention, and all changes that fall within the scope of the protection of the present patent will be made without departing from the spirit of the present invention.
Claims (2)
1. A method for consolidating loose coal rock mass in a small-kiln mining damage area is characterized by comprising the following steps:
step 1, drilling a plurality of upward roof deep grouting holes and roof shallow grouting holes in a roof at the front end of a roadway, and drilling roadway upper side holes and roadway lower side holes in two sides of the roadway;
step 2, placing the No. I grouting material into a hopper assembly of a grouting device, adding water with the same volume, stirring, then injecting the mixture into a deep grouting hole of a top plate and a shallow grouting hole of the top plate one by one, and then flushing the grouting device and a pipeline by clear water; placing the No. II grouting material into a hopper assembly of a grouting device, adding water with the same volume, stirring, injecting the mixture into a side hole at the upper part of a roadway and a side hole at the lower part of the roadway one by one, and finally flushing the grouting device and a pipeline by clear water;
the No. I grouting material comprises a component A and a component B, wherein,
the component A comprises the following components in parts by weight: 55-60 parts of calcium sulphoaluminate cement, 38-43 parts of fly ash, 0.8-1.5 parts of sodium carbonate, 0.4-0.8 part of calcium sulfate and 0.2-0.5 part of calcium oxide;
the component B comprises 35 to 45 percent of potassium diatomate and 55 to 65 percent of stannous octoate;
the component A and the component B are mixed according to the volume ratio of 1:1 for use;
the grouting material II comprises a component C and a component D, wherein,
the component C comprises the following components in parts by weight: 55-65 parts of clay, 30-37 parts of cement, 3-5 parts of coal gangue powder and 0.7-1.5 parts of gypsum;
the component D is a mixture of 35 to 45 percent of accelerating agent, 35 to 45 percent of catalyst and 15 to 25 percent of suspending agent;
mixing the component C and the component D according to a volume ratio of 1: 1;
step 3, after the slurry is injected for 6-8 hours, the top plate of the small-kiln mining damaged area and the loose coal rock mass of the surrounding rocks at the two sides are solidified, and then the roadway tunneling work is started;
repeating the steps 1 to 3 to finish the underground consolidation and the tunnel excavation of the loose coal rock mass in the small-kiln mining damage area;
the punching positions and angles of the top plate deep grouting holes are as follows:
the first top plate deep grouting hole is spaced from the roadway side by a distance L2The position forms an included angle theta with the trend of the roadway and a tilted included angle beta with the roadway;
a second top plate deep grouting hole which is 2L away from the first top plate deep grouting hole1The included angle theta between the position and the trend of the roadway and the included angle 90 degrees between the position and the trend of the roadway are included, and the second top plate deep grouting hole is positioned in the middle of the trend of the roadway;
a third top plate deep grouting hole with a distance of 2L from the second top plate deep grouting hole1The position forms an included angle theta with the trend of the roadway and a tilted included angle beta with the roadway;
the punching positions and angles of the top plate shallow grouting holes are as follows:
the first top plate shallow grouting hole is L away from the top plate deep grouting hole in the front end trend of the roadway top plate3Position, inclined upper distance lane slope L1+L2The position forms an included angle theta with the trend of the roadway;
a second shallow roof grouting hole 2L apart from the first shallow roof grouting hole along the roadway1The position and the heading of the roadway form an included angle theta;
inclined included angles between the first top plate shallow grouting hole and the roadway and included angles between the second top plate shallow grouting hole and the roadway are both 90 degrees;
the punching positions and angles of the side holes at the upper part of the roadway and the side holes at the lower part of the roadway are as follows:
side holes at the upper part of the roadway: the distance h between the deep grouting holes and the top plate of the tunnel is arranged on the same cross section of the deep grouting holes on two sides of the tunnel1The included angle alpha is formed between the position and the horizontal direction;
side holes at the lower part of the roadway: the distance h from the open hole position of the side hole at the upper part of the roadway to the direction of the roadway bottom plate is arranged on the same cross section of the two sides of the roadway and the deep grouting hole2And the angle alpha is formed with the horizontal direction.
2. The method for consolidating loose coal rock mass in a small-kiln mining failure area under the well according to claim 1, characterized in that: and the moving included angle between the deep grouting hole of the top plate and the roadway is the same as the moving included angle theta between the shallow grouting hole of the top plate and the roadway.
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