LU101599B1 - Grouting reinforcement method for ground drilling to coal seam broken roof and grouting apparatus - Google Patents
Grouting reinforcement method for ground drilling to coal seam broken roof and grouting apparatus Download PDFInfo
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- LU101599B1 LU101599B1 LU101599A LU101599A LU101599B1 LU 101599 B1 LU101599 B1 LU 101599B1 LU 101599 A LU101599 A LU 101599A LU 101599 A LU101599 A LU 101599A LU 101599 B1 LU101599 B1 LU 101599B1
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- grouting
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- material suction
- high pressure
- coal seam
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- 239000003245 coal Substances 0.000 title claims abstract description 52
- 238000005553 drilling Methods 0.000 title claims abstract description 51
- 230000002787 reinforcement Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 100
- 239000000463 material Substances 0.000 claims abstract description 92
- 238000009792 diffusion process Methods 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 33
- 239000007924 injection Substances 0.000 claims description 33
- 238000011010 flushing procedure Methods 0.000 claims description 25
- 239000003921 oil Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 5
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 239000011268 mixed slurry Substances 0.000 claims description 3
- 239000002952 polymeric resin Substances 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 238000007789 sealing Methods 0.000 abstract description 6
- 239000011440 grout Substances 0.000 abstract description 3
- 239000011435 rock Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009430 construction management Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
- E21D23/0481—Supports specially adapted for use in combination with the placing of filling-up materials
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
A grouting reinforcement method for ground drilling to coal seam broken roof and a grouting apparatus are provided in the present invention. The present invention adopts the method for grouting reinforcement by drilling from ground to coal seam broken roof, which has a larger operation space, don't need special hole sealing reduces the technical difficulty of drilling and grouting and overcomes the disadvantages of original underground grouting, that is, there is larger limit on drilling angle, grouting range is small, the hole sealing is difficult, the grout is easy to flow out, and the grouting effect is bad and the like. The method for grouting of the present invention comprises arranging density, depth and diameter of boreholes and drilling holes in turn according to the situation of coal seam broken roof and ground; selecting suitable grouting material and grouting using the grouting device in the present invention. In the grouting device is of the present invention, the raw material is sucked up using metering pump so that proportion of raw material is accuracy, and a pressure gauge and flowmeter are disposed so that grouting pressure and quantity of flow are stable and controllable. The diffusion area of slurry is large, the grouting effect is good and porous grouting achieves the full cover on the broken roof, the overall strength of 20 extremely thick and quite thick coal seam broken roof is greatly improved.
Description
BL-5122 LU101599
DESCRIPTION Grouting reinforcement method for ground drilling to coal seam broken roof and grouting apparatus Field of Invention The present invention belongs to the field of grouting reinforcement of coal seam broken roof, relates to a method for preventing the caving of extremely thick broken roof from influencing working face hydraulic support and coal wall, and specially relates to a method for grouting reinforcement by drilling from ground to coal seam broken roof with super-large thickness. Background of the Invention There are quite thick immediate roofs above the working face of part of the coal mines in China and the roofs are breakable. It mainly has characteristics that the thickness of rock stratum is large, the strengthen of rock stratum is low, the development degree of fracture is high, the integrity is poor, self-stability is low and the like, which cause hidden dangers in the exploitation process, for example, roof fall phenomenon appears for the working face roofs and roadway roofs, rib spalling of coal wall, roof leakage and roof fall, crushing of hydraulic support appear in the trigonum. The main factors causing the phenomena include poorly physical and mechanical properties of the roof rock stratum itself, repeated disturbance of work face mining and local structure and the like. The exposure time allowed for the working face broken roof is short and the exposure area thereof is small. If the timely support and control can’t be done, roof leakage accident will happen and scope of roof leakage will be larger and larger. The control needs to be performed previously before the roof leakage happens locally in order to prevent the accident of leakage and collapse from occurring at the broken roof. The methods of strengthening geological exploration, strengthening 1
BL-5122 LU101599 construction management, advance support, advance support at the structure, drilling and grouting at the roadway and the like are mainly adopted in the prior technology to perform the support and control of broken roofs. However, the broken roof can’t be controlled completely effectively, especially when the working face has thicker breakable roof, adopted drilling in the shaft bottom and grouting has a general effect. Firstly, the breakable roof has a larger thickness and the engineering quantity is large; secondly, there is larger limit on construction angle of the underground drilling and the drilling is quite difficult to meet the design requirements, which cause a bad grouting effect; lastly, The grouting range is small, the hole sealing is difficult, the grout is easy to flow out, and the grouting effect is bad for the underground drilling on the roof. Therefore, an improved technical solution needs to be provided against the shortcomings of the above prior art.
SUMMARY An object of the present invention is to provide a method and grouting device for grouting reinforcement by drilling from ground to coal seam broken roof, for at least solving the problems that limit on construction angle is larger, the grouting range is small, the hole sealing is difficult, the grout is easy to flow out, and the grouting effect is bad and the like for drilling on the roof at present. In order to achieve the above-mentioned purpose, following technical solutions are provided in the present invention: A method for grouting reinforcement by drilling from ground to coal seam broken roof comprises the following steps of: step S1, drilling holes in turn according to situation of working face roof and ground; step S2, selecting a grouting material, determining grouting parameters and installing a grouting device; step S3, performing the grouting in turn. In the above-mentioned method for grouting reinforcement of drilling from 2
BL-5122 LU101599 ground to coal seam broken roof, preferably, the Step S1 particularly comprises the following steps of: step S11, determining density and arrangement form of boreholes and the diameter size of boreholes according to breaking situation of working face roof; step S12, determining depth of each of ground boreholes according to altitude and attitude of working face coal seam broken roof and the altitude of ground boreholes position; step S13, drilling holes in turn according to the direction of working face advance.
In the above-mentioned method for grouting reinforcement by drilling from ground to coal seam broken roof, preferably, the Step S2 particularly comprises the following steps of: step S21, selecting Malisan liquid polymer resin material as the grouting material, wherein material A and material B are proportioned by volume 1:1; step S22, taking samples and testing slurry diffusion radius y of the coal seam roof, fissure ratio » and effective filling coefficient of slurry in fissures; step S23, determining grouting pressure and quantity of grouting slurry; There are some differences in grouting pressure according to difference of lithology of coal seam roof, selection range of the grouting pressure is 5MPa~8MPa, and quantity of grouting slurry is calculated according to the slurry diffusion radius y and fissure rate n, Q=2nyHnp In the formula, Q - injection quantity of slurry; y - diffusion radius of the slurry; H - length of grouting section; n - fissure ratio; BL - effective filling coefficient of slurry in fissures, wherein value range of 6 is 0.3~0.9; step S24, installing the grouting device to prepare grouting. 3
BL-5122 LU101599 In the above-mentioned method for grouting reinforcement by drilling from ground to coal seam broken roof, preferably, in the step S3, pipelines are washed using lubricating oil immediately after grouting of each hole ends, so as to prevent mixed slurry from solidifying in the pipelines.
In the above-mentioned method for grouting reinforcement by drilling from ground to coal seam broken roof, preferably, the grouting device in the step S2 comprises: storage tanks comprising storage tank A and storage tank B for storing raw material of grouting slurry; material suction pipes comprising material suction pipe A and material suction pipe B, feed ends of which are connected with the discharge ports of the storage tank A and the storage tank B respectively, and discharge ends of which are connected with feed ends of a slurry mixing device; the slurry mixing device comprising a material suction pump and a stirring device for sucking up slurry and stirring and mixing, a discharge end of which is connected with a feed end of a mixture transporting pipe; the mixture transporting pipe, a discharge end of which is connected with an input end of a high pressure grouting pump; the high pressure grouting pump, an output end of which is connected with a feed end of a high pressure slurry transporting pipe; the high pressure slurry transporting pipe, a discharge end of which is connected with a joint of a high pressure slurry injection gun; the high pressure slurry injection gun, the other end of which is conical and enclosed in order to being put into a deep hole conveniently, a barrel of which is cylindrical and a barrel wall of which is uniformly arranged with grouting holes.
In the above-mentioned grouting device for grouting reinforcement by drilling from ground to coal seam broken roof, preferably, the material suction pumps included in the slurry mixing device comprise a material suction pump A and a material suction pump B, which are connected to the discharge ends of the material suction pipe A and the material suction pipe B respectively. 4
BL-5122 LU101599 In the above-mentioned grouting device for grouting reinforcement by drilling from ground to coal seam broken roof, preferably, both the material suction pump A and material suction pump B are metering pumps and can accurately control the quantity of flow of suction material so as to control volume proportion of two slurries in the stirring device conveniently.
In the above-mentioned grouting device for grouting reinforcement by drilling from ground to coal seam broken roof, preferably, a pressure gauge for observing grouting pressure and a flow meter for observing grouting quantity of flow are disposed on the high pressure slurry transporting pipe.
In the above-mentioned grouting device for grouting reinforcement by drilling from ground to coal seam broken roof, preferably, the high pressure slurry injection gun comprises a joint, a grouting cylinder, and a conical closing head, the joint size of the high pressure slurry injection gun remains unchanged, and diameter and length of the injection cylinder and density of grouting holes are disposed with multiple sets of specifications.
In the above-mentioned grouting device for grouting reinforcement by drilling from ground to coal seam broken roof, preferably, the discharge port of the material suction pipe A and material suction pipe B are connected to feed ports of a three-way valve A and a three-way valve B respectively, discharge ports of the three-way valve A and three-way valve B are connected to input ends of the material suction pump A and material suction pump B respectively. The reversing ports of the three-way valve A and three-way valve B are connected to discharge ends of a flushing oil pipe A and a flushing oil pipe B respectively, and feed ends of the flushing oil pipe A and flushing oil pipe B are connected to discharge ports of flushing material tank, and both the three-way valve A and three-way valve B are converging three-way valves.
Compared to the closest prior art, the technical schemes provided in the invention have the following excellent effects: In the technical solutions provided in the present invention, the mechanical 5
BL-5122 LU101599 properties of the weak face of the broken roof rock stratum are effectively improved by drilling from ground to the broken roof of coal seam and grouting reinforcement, and the internal friction angle and cohesion of fissure of the rock stratum itself and interlamination are significantly improved by fully grouting.
Compared with the drilling from underground and grouting, the drilling from ground and grouting construction has strong purpose, large operation space, convenient operation, and large diffusion area of one time grouting, and no special hole sealing is required.
The technical difficulty of drilling and grouting is reduced, the grouting equipment is configured reasonably, the proportion of grouting slurries is uniform, the pressure is stable and controllable, the grouting effect is effectively improved, the overall strength of coal seam broken roof is greatly improved, and the certain workload is reduced.
The reinforcement effect on the extremely thick and quite thick coal seam broken roof is greatly improved.
Brief Description of the Drawings The drawings of the description constituting a part of the present application are used to provide further understanding to the present invention.
And the schematic examples of the present invention and the description thereof are used to explain the present invention, but not to constitute the undue limitation(s) to the present invention.
Wherein: Fig. 1 is the flow diagram of the grouting method in the particular examples of the present invention; Fig. 2 is the particular flow diagram of the step S1 in Fig. 1; Fig. 3 is the particular flow diagram of the step S2 in Fig. 1; Fig. 4 is the structural schematic diagram of the high pressure grouting device in the particular examples of the present invention; Fig. 5 is the structural schematic diagram of the high pressure slurry injection gun in the particular examples of the present invention; Fig. 6 is the schematic diagram of the roof and bottom of coal seam in the particular examples of the present invention; 6
BL-5122 LU101599 Fig. 7 is the schematic diagram of the arrangement of drilling from ground; In the Figure, 1, storage tank A; 2, storage tank B; 3, material suction pipe A; 4, material suction pipe B; 5, slurry mixing device; 6, mixture transporting pipe; 7, high pressure grouting pump; 8, high pressure slurry transporting pipe; 9, high pressure slurry injection gun; 10, liquid outlet of high pressure slurry injection gun; 11, ground borehole; 12, topsoil; 13, upper rock stratum of coal seam; 14, roof broken rock stratum; 15, coal seam; 16, flushing oil pipe A; 17, flushing oil pipe B; 18, flushing material tank.
Detailed description The present invention will be described in details hereinafter by referring to drawings and combining with examples. What needs to be illustrated is that the examples and the features in the examples of the present application can be combined one another under the condition without conflict.
In the description of the present invention, the direction or position relationships indicated by the terms “longitudinal direction”, “lateral direction”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom” and the like are shown on the basis of drawings, and are merely for the purpose of describing the present invention conveniently but not requiring that the present invention must be constructed and operated in the specific orientation, and thus shall not be understood as the limitation to the present invention. The terms “being connected” and “connection” used in the present invention shall be generalized understood, for example, they may be either fixed connection or detachable connection, and may be either direct being connected or indirect being connected via intermediate component(s), the concrete meaning of the above terms may be understood according to specific condition(s) for those skilled in the art.
As shown in FIGS.1-7, a method and grouting device for grouting reinforcement by drilling from ground to coal seam broken roof are provided in the particular examples of the present invention.
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Bl-s122 LU101599 According to the examples of the present invention, a grouting device for grouting reinforcement by drilling from ground to coal seam broken roof is shown in FIG. 4. The device for grouting reinforcement comprises storage tanks, material suction pipes, flushing oil pipes, a flushing material tank 18, a slurry mixing device 5, a mixture transporting pipe 6, a high pressure grouting pump 7, a high pressure slurry transporting pipe 8, and a high pressure slurry injection gun 9.
The storage tanks are used for storing raw material of grouting slurry and the storage tanks comprise a storage tank A 1 and storage tank B 2. The storage tank A 1 and the storage tank B 2 are respectively used to store malisan A and malisan B, which are the grouting materials used in this example.
The material suction pipes comprise a material suction pipe À 3 and a material suction pipe B 4. The feed ends of the material suction pipe A 3 and material suction pipe B 4 are respectively connected to the discharge ends of the storage tank A 1 and storage tank B 2; and discharge ends of the material suction pipe A 3 and material suction pipe B 4 are respectively connected to feed ports of a three-way valve A and a three-way valve B; reversing ports of the three-way valve A and three-way valve B are connected to discharge ends of flushing oil pipe A 16 and flushing oil pipe B 17 respectively; feed ends of the flushing oil pipe A 16 and flushing oil pipe B 17 are connected to the discharge ports of the flushing material tank 18 respectively; Discharge ports of the three-way valve A and three-way valve B are respectively connected to feed ports of the material suction pump A and material suction pump B; and the materials sucked up can be switched by two converging three-way valves, achieving that the material suction process of grouting and the oil suction of flushing can be switched at any time.
The slurry mixing device 5 comprises a material suction pump and a stirring device for sucking up slurry in proportion and stirring and mixing the slurry sufficiently. Feed ends of the slurry mixing device 5 are connected to discharge ends of the material suction pipe A 3 and material suction pipe B 4 and feed ends of the slurry mixing device 5 are connected to feed ends of the mixture transporting pipe 6. Material suction pump of the slurry mixing device 5 adopts 8
Bl-s122 LU101599 two metering pumps with the same models, which are material suction pump A and material suction pump B respectively. Metering pumps are not affected by the inside pressure of the mixing device and can accurately control the quantity of flow of suction slurry so as to facilitate accurately controlling of the volume proportion of the two slurries in the stirring device.
A discharge end of the mixture transporting pipe 6 is connected to an input end of the high pressure grouting pump 7.
An output end of the high pressure grouting pump 7 is connected to the feed end of high pressure slurry transporting pipe 8.
A discharge end of the high pressure slurry transporting pipe 8 is connected to the high pressure slurry injection gun 9. In order to observe grouting pressure and grouting quantity of flow conveniently, a pressure gauge and a flow meter are disposed on the high pressure slurry transporting pipe.
One end of the high pressure slurry injection gun 9 is connected to the high pressure slurry transporting pipe, and the other end of the high pressure slurry injection gun 9 is of conical enclosed shape so as to be put into a deep hole conveniently. Barrel of high pressure slurry injection gun 9 is cylindrical and a barrel wall of the high pressure slurry injection gun 9 is uniformly arranged with grouting holes. The joint of the high pressure slurry injection gun 9 is unchanged in size so as to be connected to the high pressure slurry transporting pipe 8 conveniently. In order to coordinate different geological conditions and different borehole diameters, the diameters of the high pressure slurry injection gun 9 are 120mm, 200mm and 300mm, and the Length of the high pressure slurry injection gun 9 is equal to the thickness of broken roof minus the slurry diffusion radius 7.
Wherein, an outer diameter of the barrel of the high pressure injection gun is no less than an outer diameter of the high pressure slurry transporting pipe 8.
According to the examples in the present invention, as shown m FIG. 1, FIG.2 and FIG.3, a method for grouting reinforcement by ground borehole 11 to broken roof of coal seam 15 is provided in the present invention. The grouting processing method comprises the following steps of: 9
Bl-s122 LU101599 S1, drilling holes in turn according to the situation of working face roof and ground, comprising, sampling and testing roof thickness of the roof of the coal seam 15, slurry diffusion radius y, fissure ratio » and effective filling coefficient ß of slurry in the fissure; determining density and arrangement forms of boreholes and the diameter size of boreholes according to breaking situation of working face roof; the arrangement of boreholes density is determined according to the slurry diffusion radius y to make sure that the arranged boreholes density can just make slurry fully cover the broken roof of coal seam 15 after grouting, diameters of boreholes have three sizes of 120mm, 200mm and 300mm for selection, preferably 120mm; the relationship among the selected diameters of high pressure slurry injection gun 9, diameters of boreholes and fissure rate » is shown in table 1 below.
Table 1 the relationship between the selected diameters of high pressure slurry injection gun 9, diameters of boreholes and fissure rate » n<0.2 02<r<04 n>04 diameters of 120mm 200mm 300mm boreholes diameters of high 120mm 200mm 300mm pressure slurry injection gun The higher fissure rate » indicates the higher broken degree of roof, like that, the holes are more likely to be damaged when holes are drilledon the broken roof , thus the larger diameter of borehole is selected. The lower fissure rate n indicates the broken degree of roof is lower, stability of surrounding rock is better and the borehole is also more stable, so the common borehole size of 120mm can be selected.
Determining the depth of each ground borehole 11 according to the altitude and attitude of broken roof of coal seam 15 of the working face and the altitude of the ground borehole 11; measuring and calculating the difference value of altitude 10
BL-5122 LU101599 between the subface of broken roof of coal seam 15 of the working face and the position of the ground borehole 11. The difference value minus slurry diffusion radius y in the position is the depth of hole to be drilled at the position.
As shown in FIG. 6 and FIG. 7, holes are drilled line by line in turn according to the direction of working face advance. Drill bit of drilling equipment passes through the ground and goes downward through topsoil 12, upper rock stratum 13of coal seam in turn, and reaching to roof broken rock stratum 14 above the coal seam 15. After reaching the drilling depth, stopping drilling hole is stopped and drilling tool is drawn out, and then single drilling operation is completed.
Drilling the next hole in turn according to the same operational procedure.
S2, selecting a grouting material, determining grouting parameters and installing a grouting device Selecting Malisan liquid polymer resin material as the grouting material, wherein material A and material B are proportioned by volume 1:1; in this example, resin is selected as the A material, catalyst is selected as the B material. When the resin and catalyst are mixed together, reaction is generated to produce expansion and multiple mesh dense elastomer is produced. And when pushed by the high pressure and injected into the crevices of broken roof (closed cracks in coal rock stratum can be opened under the action of high pressure), it can extend along the crevices of broken roof until all the cracks (including cracks which are difficult to be perceived by naked eyes and cracks which are opened again under the action of high pressure) are filled. In this example, the selection of material A and material B is not in order, and it also can be done that catalyst is selected as the material A and resin is selected as the material B.
Determining grouting pressure and quantity of grouting slurry 0 ; There are some differences in grouting pressure according to difference of the roof lithology of different coal seams 15, a selection range of the grouting pressure is SMPa~8MPa, and quantity of grouting slurry is calculated according to the slurry diffusion radius y and fissure rate n, Q=2ny Hnp 11
BL-5122 LU101599 In the formula, Q - injection quantity of slurry; y - slurry diffusion radius; H - length of grouting section; n - fissure ratio; B - effective filling coefficient of slurry in the fissure, wherein value range of ß is 0.3~0.9; Preparing enough Malisan material according to injection quantity of slurry Q and installing the grouting device to prepare grouting.
S3, performing the grouting in turn:
Firstly, the high pressure slurry injection gun 9 with proper size is selected, is connected to the high pressure slurry transporting pipe 8, and is put into the borehole and is sent to the grouting position.
Secondly, valves of three-way valve A and three-way valve B are respectively rotated and connected to the material suction pipe A 3 and the material suction pipe B 4. Thirdly, the material suctionpump À and material suction pump B are adjusted to make their quantity of flow to be same, switch of the slurry mixing device 5 is turned on, the slurry is sucked up and evenly mixed to transport to the high pressure grouting pump 7. Then, the high pressure grouting pump 7 is opened for grouting, the pressure of the pressure gauge and flow quantity of flow meter on the high pressure slurry transportingpipe 8 are payed attention at any time during the grouting process.
When the flow quantity is less than 5L/min, the grouting continues to be performed steadily for 10-20min, when the pressure is stable at a high grouting pressure of about 8MPa, grouting is stopped and the injection gun is drawn out of the borehole.
Finally, the grouting pipeline is flushed.
The three-way valve A and the three-way valve B areconnected to the flushing oil pipe A 16 and the flushing oil pipe B 17 immediately after the end of the grouting, so that the flushing lubricating oil in the flushing material tank 18 is sucked into the grouting pipeline, cleans the pipeline to prevent the mixed slurry from solidifying in the pipeline; the grouting of the hole is completed, and the grouting of the next hole is performed.
In summary, thepresent invention also has the following beneficial technical effects:
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BL-5122 LU101599 In the technical solutions provided in the present invention, the mechanical properties of the weak face of the broken roof rock stratum are effectively improved by the drilling from ground to the coal seam broken roof and grouting reinforcement, the overall strength is improved, and the internal friction angle and cohesion of crack of the rock stratum itself and interlamination are significantly improved. Compared with the underground drilling and grouting, the ground drilling and grouting construction has strong purpose, large operation space, convenient operation, large diffusion area of one time grouting, and no special hole sealing is required. The technical difficulty of drilling and grouting is reduced, the grouting equipment is configured reasonably, the proportion of grouting slurry is precise and uniform, the pressure is stable and controllable, the grouting effect is effectively improved, the overall strength of the broken roof of coal seam is greatly improved, and the certain workload is reduced. The reinforcement effect on the extremely thick and quite thick coal seam broken roof is greatly improved.
What mentioned above are merely preferred example(s) of the present invention and are not used to limit the present invention. The present invention may have various alterations and changes for those skilled in the art. Any modification(s), equivalent substitution(s), improvement(s) and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
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Claims (10)
1. A method for grouting reinforcement by drilling from ground to coal seam broken roof, comprising: step S1, drilling holes in turn according to the situation of working face roof and ground; step S2, selecting a grouting material, determining grouting parameters and installing a grouting device; which particularly comprises: step S21, selecting Malisan liquid polymer resin material as the grouting material, wherein material A and material B are proportioned by volume 1:1; step S22, sampling and testing slurry diffusion radius y of the coal seam roof, fissure ratio » and effective filling coefficient ß of slurry in a fissure; step S23, determining grouting pressure and quantity of grouting slurry, in which there are some differences in grouting pressure according to difference of lithology of coal seam roof, selection range of the grouting pressure is 5MPa~8MPa, and quantity Q of grouting slurry is calculated according to the slurry diffusion radius y and the fissure rate n, Q = 27y nf ; in the formula: Q - injection quantity of slurry; y - slurry diffusion radius; H - length of grouting section; n - fissure ratio; B - effective filling coefficient of slurry in a fissure, wherein value range of 6 is 0.3~0.9; Step S24, installing the grouting device to prepare grouting; Step S3, performing the grouting in turn.
2. The method for grouting reinforcement by drilling from ground to coal seam broken roof according to claim 1, characterized in that, the step S1 particularly comprises the following steps of: 14
BL SZ LU101599 S11, determining the density, arrangement form and the diameter size of boreholes according to the breaking situation of working face roof; S12, determining depth of each of ground boreholes according to altitude and attitude of working face coal seam broken roof and altitude of ground borehole position; S13, drilling holes in turn according to the direction of working face advance.
3. The method for grouting reinforcement by drilling from ground to of coal seam broken roof according to claim 1, characterized in that, in the step S3, pipelines immediately are washed using lubricating oil after grouting of each hole ends, so as to prevent mixed slurry from solidifying in the pipelines.
4. A grouting device used in the method for grouting reinforcement by drilling from ground to coal seam broken roof according to anyone of claim 1-3, comprising: storage tanks for storing raw material of grouting slurry, comprising a storage tank A and a storage tank B; material suction pipes, comprising a material suction pipe A and a material suction pipe B, wherein the feed ends of the material suction pipe A and the material suction pipe B are connected to the discharge ends of the storage tank A and the storage tank B respectively, and the discharge ends of the material suction pipe A and the material suction pipe B are respectively connected to feed ends of a slurry mixing device; the slurry mixing device comprising material suction pumps and a stirring device for sucking up slurry, stirring and mixing, wherein a discharge end of the slurry mixing device is connected to a feed end of a mixture transporting pipe; the mixture transporting pipe, a discharge end of which is connected to an input end of a high pressure grouting pump; 15
BLS122 LU101599 the high pressure grouting pump, an output end of which is connected to a feed end of a high pressure slurry transporting pipe; the high pressure slurry transporting pipe, a discharge end of which is connected to a feed end of a high pressure slurry injection gun; the high pressure slurry injection gun, the injection end of which is conical in order to be put into a deep hole conveniently, the barrel of which is cylindrical and a barrel wall of which is arranged with liquid outlets.
5. The grouting device according to claim 4, characterized in that, the material suction pumps comprise a material suction pump A and a material suction pump B, the material suction pump A and the material suction pump B are connected to discharge ends of the material suction pipe A and the material suction pipe B respectively.
6. The grouting device according to claim 5, characterized in that, both the material suction pump A and material suction pump B are metering pumps and can accurately control the quantity of flow of suction material to control a volume proportion of two slurries in the stirring device conveniently.
7. The grouting device according to claim 4, characterized in that, a pressure gauge for observing grouting pressure and a flow meter for observing grouting quantity of flow are disposed on the high pressure slurry transporting pipe.
8. The grouting device according to claim 4, characterized in that, the high pressure slurry injection gun comprises a joint, a grouting cylinder, and a conical closing head, and the diameter and length of the grouting cylinder and the density of grouting holes are disposed with multiple sets of specifications, the joint of the high pressure slurry injection gun is unchanged in size so as to be connected toa discharge end of the high pressure slurry transporting pipe.
16
BL3122 LU101599
9. The grouting device according to claim 8, characterized in that, an outer diameter of the barrel of the high pressure slurry injection gun is not less than an outer diameter of the high pressure slurry transporting pipe.
10. The grouting device according to claim 5, characterized in that, the discharge ends of the material suction pipe A and the material suction pipe B are connected to feed ends of a three-way valve A and a three-way valve B respectively, discharge ends of the three-way valve A and three-way valve B are connected to input ends of the material suction pump A and material suction pump B respectively; reversing ports of the three-way valve A and the three-way valve B are connected to discharge ends of a flushing oil pipe A and a flushing oil pipe B respectively; feed ends of the flushing oil pipe A and flushing oil pipe B are connected to discharge ports of a flushing material tank; and both the three-way valve A and three-way valve B are converging three-way valves. 17
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811053469.6A CN108979590A (en) | 2018-09-01 | 2018-09-01 | A kind of surface drilling to coal seam breaking roof grouting and reinforcing method and grouting device |
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| LU101599B1 true LU101599B1 (en) | 2020-03-03 |
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| LU101599A LU101599B1 (en) | 2018-09-01 | 2019-03-28 | Grouting reinforcement method for ground drilling to coal seam broken roof and grouting apparatus |
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| CN (1) | CN108979590A (en) |
| LU (1) | LU101599B1 (en) |
| WO (1) | WO2019228041A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108979590A (en) * | 2018-09-01 | 2018-12-11 | 安徽理工大学 | A kind of surface drilling to coal seam breaking roof grouting and reinforcing method and grouting device |
| CN110985058B (en) * | 2019-12-26 | 2021-03-23 | 安徽理工大学 | Grouting reinforcement method for fault fracture zone of coal face |
| CN111810196B (en) * | 2020-07-15 | 2022-02-11 | 中勘资源勘探科技股份有限公司 | Method for reinforcing broken top plate through ground grouting |
| CN112459744A (en) * | 2020-11-25 | 2021-03-09 | 安徽铜冠（庐江）矿业有限公司 | Hole sealing system and hole sealing method for geological prospecting drill hole |
| CN112727395B (en) * | 2020-12-24 | 2023-03-24 | 北京大地高科地质勘查有限公司 | Test and grouting reinforcement system for bearing water layer above coal seam roof |
| CN113482664A (en) * | 2021-08-17 | 2021-10-08 | 华能铜川照金煤电有限公司西川煤矿分公司 | Pressure concentration area surrounding rock grouting reinforcement method |
| CN114412512A (en) * | 2022-01-24 | 2022-04-29 | 渭南陕煤启辰科技有限公司 | Remote rapid and accurate grouting construction device and using method |
| CN116752934B (en) * | 2023-08-21 | 2023-10-20 | 中煤科工集团沈阳研究院有限公司 | Drilling inner wall spraying hole protection technology |
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| SU711292A1 (en) * | 1978-06-16 | 1980-01-25 | Университет Дружбы Народов Имени Патриса Лумумбы | Method of working thick gently sloping coal beds |
| CN201722699U (en) * | 2010-07-17 | 2011-01-26 | 中铁十二局集团第二工程有限公司 | Injection gun device for chemical grout water shutoff construction |
| CN102230382B (en) * | 2011-05-20 | 2013-03-06 | 中国矿业大学 | Progressive shielding booster-type grouting and reinforcing technology for baseboard |
| CN102704933B (en) * | 2012-05-25 | 2014-10-29 | 中国矿业大学 | Isolated-section grouting filling coal-mining method for mining overburden rock |
| CN102877858B (en) * | 2012-09-26 | 2015-07-01 | 安徽理工大学 | Reinforcing method for crushed top plate of coal face |
| CN103758538B (en) * | 2014-01-26 | 2016-03-02 | 山东科技大学 | A kind of breaking roof Collapsed zone grouting filling analog simulation method |
| CN104179511A (en) * | 2014-08-13 | 2014-12-03 | 淮南矿业(集团)有限责任公司 | Novel hole arrangement grouting method for enabling ground pre-grouting reinforcing roadway to penetrate through surrounding rocks at fault fracture zone |
| CN104533452B (en) * | 2014-12-05 | 2016-08-24 | 中国矿业大学 | A kind of underground coal mine crushes coal body stagewise grouting strengthening method |
| CN104775816B (en) * | 2015-02-27 | 2017-04-26 | 中国矿业大学 | Isolated grouting-filling mining method for overburden rock without village migration under cut-side local pressed-coal conditions |
| CN104929666A (en) * | 2015-04-30 | 2015-09-23 | 中国矿业大学 | Top breaking gob-side entry retaining method for tender roofs |
| CN107013182A (en) * | 2017-03-22 | 2017-08-04 | 枣庄矿业(集团)付村煤业有限公司 | The long-armed pumping water into coal hole plugging equipment of extra-high voltage and its application method |
| CN107740677A (en) * | 2017-09-22 | 2018-02-27 | 中煤科工集团西安研究院有限公司 | A kind of broken soft seam concordant directional long borehole gas pumping method for crossing working face |
| CN107816352A (en) * | 2017-10-16 | 2018-03-20 | 安徽理工大学 | A kind of method of the hard thick top plate pressure relief erosion control of waterpower cutting |
| CN108049899A (en) * | 2017-12-06 | 2018-05-18 | 中国矿业大学(北京) | A kind of gob side entry driving thin coal pillar breaking surrounding rock reinforcement means |
| CN108979590A (en) * | 2018-09-01 | 2018-12-11 | 安徽理工大学 | A kind of surface drilling to coal seam breaking roof grouting and reinforcing method and grouting device |
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2018
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2019
- 2019-03-28 WO PCT/CN2019/080109 patent/WO2019228041A1/en active Application Filing
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| CN108979590A (en) | 2018-12-11 |
| WO2019228041A1 (en) | 2019-12-05 |
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