CN114542067A - Safe mining method for coal seam covered with hard rock stratum - Google Patents
Safe mining method for coal seam covered with hard rock stratum Download PDFInfo
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- CN114542067A CN114542067A CN202210045667.8A CN202210045667A CN114542067A CN 114542067 A CN114542067 A CN 114542067A CN 202210045667 A CN202210045667 A CN 202210045667A CN 114542067 A CN114542067 A CN 114542067A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/007—Drilling by use of explosives
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
Abstract
The invention discloses a safe mining method for a coal seam covered with a hard rock stratum, and aims to realize safe mining of the coal seam. Therefore, the coal seam safety mining method provided by the embodiment of the invention utilizes a roof drilling and blasting method to drill and blast a coal seam roof containing a large-thickness complete hard rock stratum in a mining overhead suspension in a working face roadway, and burst or cut off the large-thickness complete hard roof rock stratum; after blasting construction is completed, the working face hydraulic support group is pushed forwards to a coal wall face, then a coal mining machine carries out normal coal mining operation, after the working face hydraulic support group pushes a direct top drilling hole position, due to the action of blasting and drilling, a suspended top of a working face roadway collapses behind the working face hydraulic support group and is filled with a goaf, and pressure relief of a coal seam roof is realized; and repeating the steps until the safe exploitation of the whole coal seam is completed.
Description
Technical Field
The invention belongs to the technical field of coal seam mining, and particularly relates to a safe mining method for a coal seam covered with a hard rock stratum.
Background
When a large-thickness complete hard rock stratum is endowed in a certain height of a coal seam roof, the hard rock stratum does not rise to a suspended ceiling of a goaf after the working face is mined, high supporting stress is caused in a coal body near the goaf, the stability of a roadway in the coal body near the goaf is greatly influenced by the high supporting stress, and the roof is difficult to deeply burst in the goaf, so that the high supporting stress caused by the suspended ceiling rock stratum of the goaf in the coal body is eliminated or effectively reduced, the stability of surrounding rocks of the roadway is improved, the safe mining of the coal seam is realized, and the key problem to be solved at present is urgently solved.
Disclosure of Invention
The invention mainly aims to provide a safe mining method of a coal seam with an overlying hard rock stratum, and aims to realize safe mining of the coal seam.
Therefore, the safe mining method for the coal seam with the overlying hard rock stratum provided by the embodiment of the invention comprises the following steps:
drilling and blasting the coal seam roof containing the large-thickness complete hard rock stratum of the mined-out suspended roof in the roadway of the working face by using a roof drilling and blasting method, and bursting or cutting off the large-thickness complete hard roof rock stratum;
after blasting construction is completed, the working face hydraulic support group is pushed forwards to a coal wall face, then a coal mining machine carries out normal coal mining operation, after the working face hydraulic support group pushes a direct top drilling hole position, due to the action of blasting and drilling, a suspended top of a working face roadway collapses behind the working face hydraulic support group and is filled with a goaf, and pressure relief of a coal seam roof is realized;
and repeating the steps until the safe exploitation of the whole coal seam is completed.
Specifically, the drilling blasting process comprises the following steps:
according to the histogram of the coal bed roof, coal is alignedSampling the hard rock stratum of the roof, and performing a drilling simulation experiment on the sample obtained by sampling in an in-situ stress environment to obtain the simulated rock debris amount W of the unit drilling amount of the sample0；
In a coal mining field, a drilling machine is utilized to drive a drill rod to drill a conventional advanced blast hole inclined upwards towards a coal seam working face to a coal seam top plate, the drill rod penetrates through a hard rock stratum of the coal seam top plate, and the formula W is used0：W1＝r2：R2Obtaining the site equivalent rock debris quantity W of the unit drilling quantity of the hard rock stratum in the coal mining site1(ii) a Wherein R is the diameter of a drill bit of a coal mining site drill rod, and R is the diameter of the drill bit adopted in the simulation experiment;
the rock debris amount generated by the unit drilling amount in the drilling process of the drill rod in the coal mining field is monitored in real time, and the field equivalent rock debris amount W is obtained1Judging the range of the hard rock stratum of the coal seam roof along the direction of the conventional advanced blast hole;
carrying out reaming treatment on the range by using reaming equipment, and carrying out non-coupling charging blasting on the advanced blast hole so as to realize advanced pre-splitting of the coal seam roof;
wherein, the explosive loading at the reaming hole of the conventional advanced blast hole is larger than the conventional explosive loading, and the explosive loading of the other parts adopts the conventional explosive loading.
Specifically, the working face hydraulic support group is composed of a plurality of hydraulic supports arranged side by side along the extending direction of the working face roadway.
Specifically, the conventional advanced blast holes are arranged on a local high mine pressure area of the coal seam, and are arranged in parallel at set intervals along the extending direction of the working face of the coal seam.
Specifically, the included angle between the conventional advanced blast hole and the horizontal plane is 60-75 degrees.
Specifically, the depth of the conventional pilot borehole exceeds the hard rock layer by 30-50 cm.
Specifically, an annular groove is formed in the drill rod, the reaming equipment comprises a plurality of reaming plates which are uniformly distributed in the annular groove and used for reaming, and a driving cylinder which drives the reaming plates to radially expand or contract to protrude or be accommodated in the annular groove, and each reaming plate is provided with a plurality of cutting teeth.
Specifically, the number of the driving cylinders is the same as that of the hole expansion plates, one end of each driving cylinder is fixedly connected with the drill rod, and the other end of each driving cylinder is fixedly connected with the inner side of the corresponding hole expansion plate.
Specifically, the driving cylinder adopts an oil cylinder.
Specifically, a rock debris collecting hopper is arranged under the conventional advanced blast hole on the drilling machine, and a displacement sensor for measuring the drilling depth of the drill rod is arranged on the drilling machine.
Specifically, the drilling machine is further provided with a weighing meter for weighing the collected rock debris.
Compared with the prior art, at least one embodiment of the invention has the following beneficial effects: the method comprises the steps of drilling and blasting the coal seam roof of the large-thickness complete hard rock stratum on the goaf suspended ceiling in a working face roadway, bursting or cutting off the large-thickness complete hard roof rock stratum, enabling the goaf suspended ceiling to collapse behind a working face hydraulic support group, enabling the goaf to be filled with caving gangue, achieving pressure relief of the coal seam roof, and supporting the rock stratum of the overlying fracture zone, so that safe mining of the coal seam is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of conventional advanced blast hole construction according to an embodiment of the present invention;
FIG. 2 is a schematic representation of a reaming apparatus according to embodiments of the invention after expansion;
FIG. 3 is a schematic representation of a reaming apparatus according to embodiments of the invention after retraction;
FIG. 4 is a sectional view taken along line A-A of FIG. 3;
wherein: 1. a coal seam roof; 101. a hard rock formation; 102. a common rock formation; 2. a drilling machine; 201. a drill stem; 3. a coal seam working face; 4. conventional advanced blast holes; 5. a reaming device; 501. expanding the hole plate; 502. a drive cylinder; 503. a cutting pick; 6. an annular groove; 7. a rock debris collecting hopper; 8. a displacement sensor; 9. a weighing meter; 10. a working face hydraulic support group; 11. a working face roadway; 12. and (4) collecting the goaf.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, a safe mining method for a coal seam with an overlying hard rock stratum comprises the steps of utilizing a roof drilling and blasting method to drill and blast a coal seam roof 1 which is mined in a working face roadway 11 and contains a large-thickness complete hard rock stratum 101, and bursting or cutting off the large-thickness complete hard roof rock stratum; after blasting construction is completed, the working face hydraulic support group 10 is pushed forwards to a coal wall face, then a coal mining machine carries out normal coal mining operation, after the working face hydraulic support group 10 pushes a direct top drilling position, due to blasting and drilling, a suspended top of a working face roadway 11 collapses behind the working face hydraulic support group 10 and is filled with a goaf 12, and pressure relief of a coal seam roof 1 is realized; and repeating the steps until the safe exploitation of the whole coal seam is completed.
In the embodiment, in the working face roadway 11, the coal seam roof 1 of the large-thickness complete hard rock layer 101 suspended on the goaf is drilled and blasted, and the large-thickness complete hard roof rock layer is burst or cut off, so that the goaf suspended roof collapses behind the working face hydraulic support group 10, the goaf 12 is filled with the collapse waste rock, the pressure relief of the coal seam roof 1 is realized, and the rock layer with the overlying fissures is supported, and the safe mining of the coal seam is realized.
The inventor further researches and discovers that the conventional advanced blast hole and the conventional explosive loading amount adopted by the current drilling and blasting method are used for blasting and presplitting, the blasting and cracking effect can be realized on the common rock stratum, but the blasting and cracking effect is poor due to insufficient explosive loading amount on the hard rock stratum, secondary blasting is generally needed or the explosive loading amount is integrally increased, but the explosive loading amount of the blast hole is increased due to insufficient explosive loading space on the conventional advanced blast hole, large-diameter drilling is generally needed, so that the expected effect of presplitting of the hard rock stratum is achieved, but the drilling speed of the large-diameter drilling is inevitably reduced, the advance of the working face is delayed, and the high-yield and high-efficiency mining of the working face is restricted. And the increase of the loading amount can cause the transition and cracking of the common rock stratum, even cause the common rock stratum to directly collapse, and seriously affect the coal mining safety. In addition, the current roof drilling and blasting method carries out drilling and blasting according to a stratum histogram, and in a real stratum, the deposition environment difference, the geological structure and the like have the effects of huge rock stratum distribution difference, which causes the coal bed and rock stratum distribution nonuniformity, so that the current stratum histogram can only provide reference, and the method is lack of sufficient guidance for fine blasting and drilling construction.
Therefore, the invention further improves the drilling and blasting method, and the specific improvement process is as follows:
according to the histogram of the coal seam roof 1, sampling the large-thickness complete hard rock stratum 101 of the coal seam roof 1, and performing a drilling simulation experiment on a sample obtained by sampling under an in-situ stress environment to obtain the simulated rock debris quantity W of the unit drilling quantity of the sample0；
In a coal mining site, a drilling machine 2 is used for driving a drill rod 201 to drill a conventional advanced blast hole 4 which inclines upwards towards a coal seam working face 3 to a coal seam roof 1, and the drill rod 201 penetrates through a hard rock layer 101 of the coal seam roof 1 and is according to a formula W0：W1＝r2：R2Obtaining the site equivalent rock debris quantity W of the unit drilling quantity of the hard rock layer 101 on the coal mining site1(ii) a Wherein, R is the diameter of a drill bit of the coal mining site drill rod 201, and R is the diameter of the drill bit adopted in the simulation experiment;
the rock debris amount generated by the unit drilling amount in the drilling process of the coal mining site drill rod 201 is monitored in real time, and the site equivalent rock debris amount W is obtained1Judging the range of the hard rock layer 101 of the coal seam roof 1 in the direction of the conventional advanced blast hole 4, carrying out hole expansion treatment on the range by using a hole expansion device 5, and carrying out non-coupling charging blasting on the advanced blast hole so as to realize advanced pre-splitting of the coal seam roof 1; wherein, the explosive loading at the reaming hole of the conventional advanced blast hole 4 is larger than the conventional explosive loading, and the explosive loading at the other parts adopts the conventional explosive loading.
Referring to fig. 1, after the blasting presplitting construction is completed, a working face hydraulic support group 10 is pushed forward to a coal seam working face 3, then a coal mining machine carries out normal coal mining operation, after the working face hydraulic support group 10 pushes a conventional advanced blast hole 4 position of a direct roof (when a rock stratum closest to a support is away), the direct roof will span a section in a goaf 12 under the action of blasting and drilling, then the roof of the coal seam collapses in the goaf 12 layer by layer along with continuous forward pushing of coal mining during hydraulic pressure, the roof cutting risk of the roof is avoided, meanwhile, the roof is promoted to collapse in time, the high mine pressure risk is avoided, the production condition of the roof is eliminated, and the risk of efficiently, accurately and quickly processing the high mine pressure is further achieved.
In the embodiment, the rock debris amount generated by the unit drilling amount in the drilling process of the coal mining site drill rod 201 is monitored in real time, and the part of the advanced blast hole needing reaming is accurately determined according to the obtained site equivalent rock debris amount, so that a charging space is provided for differentiated charging, each rock stratum of the coal seam roof 1 has a good blasting pre-splitting effect, the hole forming speed can be ensured, and high-yield and high-efficiency mining of a working face is realized; in addition, compare and directly rely on stratum histogram to obtain the reaming position of leading big gun hole, the accurate location of hard rock stratum 101 can be realized to this application, provides the basis for the accurate high-efficient blasting of coal seam roof 1.
In some embodiments, in order to ensure the safety of coal mining, the conventional advanced blast holes 4 are arranged on a local strong mine pressure area of the coal seam, and are arranged in a plurality of positions at set intervals side by side along the extending direction of the coal seam working face 3. In addition, after comprehensively considering the influence factors such as the drilling length, the construction speed and the like, the included angle between the conventional advance blast hole 4 and the horizontal plane is preferably selected to be 60-75 degrees, the depth of the conventional advance blast hole 4 is set for the purpose of fracturing the overlying hard rock layer 101, and about 30-50cm is recommended to exceed the hard rock layer 101.
It can be understood that, in practical application, the wave impedance of the rock corresponding to each rock stratum of the coal seam roof 1 is obtained according to experiments, the detonation velocity can be calculated according to the matching relationship between the rock stratum wave impedance and the explosive impedance and the density of the selected explosive, the charge amount and the number of cartridges at the corresponding positions of the advance blastholes and each rock stratum can be determined, and meanwhile, the sizes of the conventional advance blastholes 4 and the hole expansion parts can be determined according to the spatial arrangement condition of the cartridges in the blasting design scheme.
Referring to fig. 2-4, in some embodiments, an annular groove 6 is formed on the outer wall of the front end of the drill rod 201, the reaming device 5 includes a plurality of reaming plates 501 uniformly distributed in the annular groove 6 for reaming, and a driving cylinder 502 for driving the plurality of reaming plates 501 to radially expand or contract to protrude or be received in the annular groove 6, and a plurality of cutting picks 503 are fixedly arranged on the outer side of each reaming plate. The reaming plate 501 is arc-shaped and made of a high-strength steel plate, and the cutting teeth 503 are firmly fixed on the reaming plate 501 in the modes of inlaying or welding and the like.
In this embodiment, when needs carry out the reaming to the big gun hole, only need remove reaming equipment 5 to the reaming position, utilize driving cylinder 502 to drive the radial expansion of reaming board 501 and make pick 503 hug closely the big gun hole inner wall all the time, later rig 2 drives drilling rod 201 idle running, can utilize pick 503 to carry out the rock drilling to the big gun hole inner wall to this reaming of realizing the big gun hole.
Referring to fig. 4, specifically, the number of the driving cylinders 502 is the same as that of the reaming plates 501, one end of each driving cylinder is fixedly connected with the drill rod 201, the other end of each driving cylinder is fixedly connected with the inner side of the corresponding reaming plate 501, the driving cylinders are connected with a control system of the drilling machine 2, and the movement of the driving cylinders is controlled by the control system of the drilling machine 2. Wherein, the driving cylinder can adopt an oil cylinder.
In addition, a steel wire mesh can be laid above the blasting area within the working face empty roof range, and the purpose of preventing broken stones on the surface of the top plate from splashing in the blasting process is achieved. Secondly, for convenient send the cartridge to reaming position, can with each cartridge one by one after tying up the propelling movement pole in advance, utilize the propelling movement pole with the cartridge individual propelling movement to big gun hole assigned position, the spatial arrangement of cartridge in the big gun hole can be for annular array arrangement, outermost cartridge can utilize the bonding glue to adhere on the big gun hole inner wall.
Referring to fig. 1, in other embodiments, a rock debris collecting bucket 7 is arranged under a conventional advanced blast hole 4 on a drilling machine 2, the rock debris in the drilling process can be collected by the rock debris collecting bucket 7, a displacement sensor 8 for measuring the drilling depth of a drill rod 201 is arranged on the drilling machine 2, the drilling amount of the drill rod 201 can be monitored in real time by the displacement sensor 8, a weighing meter 9 for weighing the collected rock debris is also arranged on the drilling machine 2, and the collected rock debris can be weighed by the weighing meter 9.
Referring to fig. 1, specifically, the overburden of the coal seam roof 1 is composed of a common rock layer 102 and a hard rock layer 101 sandwiched between the common rock layers 102, and by using the density difference between the hard rock layer 101 and the common rock layer 102, the amount of rock debris in the drilling process is subjected to a sudden change, so as to determine the starting point and the ending point of the hard rock layer 101 in the drilling process.
It should be explained that, in the actual design process, the rocks of different lithology of the overburden rock are obtained on site, the in-situ stress environment of different rock stratums is reduced in a laboratory, the small-diameter drill bit with the radius of r is used for carrying out in-situ drilling simulation to obtain the rock debris amount of each rock stratum unit drilling length, and then r is used for obtaining the rock debris amount of each rock stratum unit drilling length2：R2The rock debris quantity of the drill bit with the site diameter of R in unit drilling length is equivalent to the rock debris quantity of the drill bit with the site diameter of R, and the site equivalent rock debris quantity of different rock stratums is obtained.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A method for safely mining a coal seam overlying a hard rock formation, comprising:
drilling and blasting a coal seam roof (1) which is mined in an air suspension roof and contains a large-thickness complete hard rock stratum (101) in a working face roadway (11) by using a roof drilling and blasting method, and bursting or cutting off the large-thickness complete hard roof rock stratum;
after blasting construction is finished, the working face hydraulic support group (10) is pushed forwards to a coal wall face, then a coal mining machine carries out normal coal mining operation, after the working face hydraulic support group (10) pushes a direct top drilling hole position, due to blasting and drilling, a suspended top of a working face roadway (11) collapses behind the working face hydraulic support group (10) and is filled with a goaf (12), and pressure relief of a coal seam roof (1) is realized;
and repeating the steps until the safe exploitation of the whole coal seam is completed.
2. A method of safely mining a coal seam as claimed in claim 1, wherein: the drilling blasting comprises the following specific processes:
according to the histogram of the coal seam roof (1), sampling a hard rock stratum (101) of the coal seam roof (1), and performing a drilling simulation experiment on a sample obtained by sampling under an in-situ stress environment to obtain the simulated rock debris quantity W of the unit drilling quantity of the sample0；
In a coal mining site, a drilling machine (2) is used for driving a drill rod (201) to drill a conventional advance blast hole (4) which inclines upwards towards a coal seam working face (3) to a coal seam roof (1), the drill rod (201) penetrates through a hard rock stratum (101) of the coal seam roof (1), and the formula W is used0：W1＝r2：R2Obtaining the site equivalent rock debris quantity W of the unit drilling quantity of the hard rock layer (101) in the coal mining site1(ii) a Wherein R is the diameter of a drill bit of a coal mining site drill rod (201), and R is the diameter of the drill bit adopted in the simulation experiment;
the rock debris amount generated by the unit drilling amount in the drilling process of the coal mining site drill rod (201) is monitored in real time, and the site equivalent rock debris amount W is obtained1Judging the range of a hard rock stratum (101) of the coal seam roof (1) along the direction of a conventional advanced blast hole (4);
carrying out reaming treatment on the range by using reaming equipment (5), and carrying out non-coupling charging blasting on the advanced blast hole so as to realize advanced pre-splitting of the coal seam roof (1);
wherein, the explosive loading at the reaming hole of the conventional advanced blast hole (4) is larger than the conventional explosive loading, and the explosive loading of the other parts adopts the conventional explosive loading.
3. A method of safely mining a coal seam as claimed in claim 2, wherein: the conventional advanced blast holes (4) are arranged on a local strong mine pressure area of the coal seam and are arranged in parallel at set intervals along the extending direction of the working face (3) of the coal seam.
4. A method of safely mining a coal seam as claimed in claim 2, wherein: the included angle between the conventional advanced blast hole (4) and the horizontal plane is 60-75 degrees.
5. A method of safely mining a coal seam as claimed in claim 2, wherein: the depth of the conventional advance blast hole (4) exceeds the hard rock stratum by 30-50 cm.
6. A method of safely mining a coal seam as claimed in any one of claims 2 to 5 wherein: an annular groove (6) is formed in the drill rod (201), the hole expanding equipment (5) comprises a plurality of hole expanding plates (501) which are uniformly distributed in the annular groove (6) and used for expanding holes and a driving cylinder (502) which drives the hole expanding plates (501) to radially expand or contract so as to protrude or be accommodated in the annular groove (6), and a plurality of cutting teeth (503) are arranged on the outer side of each hole expanding plate (501).
7. A safe mining method for coal seams as claimed in claim 6, characterized in that: the number of the driving cylinders (502) is the same as that of the hole expansion plates (501), one end of each driving cylinder (502) is fixedly connected with the drill rod (201), and the other end of each driving cylinder is fixedly connected with the inner side of the corresponding hole expansion plate (501).
8. A safe mining method for coal seams as claimed in claim 6, characterized in that: the rock debris collecting hopper (7) is arranged under the conventional advanced blast hole (4) on the drilling machine (2), and a displacement sensor (8) for measuring the drilling depth of the drill rod (201) is arranged on the drilling machine (2).
9. A method of safely mining a coal seam as claimed in claim 8 wherein: and the drilling machine (2) is also provided with a weighing meter (9) for weighing the collected rock debris.
10. A method of safely mining a coal seam as claimed in any one of claims 2 to 5 wherein: the working face hydraulic support group (10) is composed of a plurality of hydraulic supports which are arranged side by side along the extending direction of the working face roadway (11).
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|---|---|---|---|---|
| CN116658163A (en) * | 2023-07-03 | 2023-08-29 | 中国矿业大学(北京) | Method for regulating and controlling caving gangue blocking degree of hard roof of goaf without coal pillar self-forming roadway |
| CN116658163B (en) * | 2023-07-03 | 2023-10-20 | 中国矿业大学(北京) | Method for regulating and controlling caving gangue blocking degree of hard roof of goaf without coal pillar self-forming roadway |
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| CN114542067B (en) | 2023-02-03 |
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