CN111236940A - Method for safely and efficiently passing reverse fault group on fully mechanized coal mining face - Google Patents
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Abstract
The invention relates to the field of coal mining, and discloses a method for safely and efficiently passing a fully mechanized mining face through an inverse fault group. The technology provides technical support for the fully mechanized coal mining face to pass through the reverse fault group under similar conditions.
Description
Technical Field
The invention relates to the field of coal mining, in particular to a method for a fully mechanized coal mining face to safely and efficiently pass through a reverse fault group.
Background
The method has the advantages that during the crossheading tunneling period of the fully-mechanized mining face, a reverse fault (the fall is larger than 3 meters) is exposed and directly influences the mining of the working face or the reverse fault exists along the mining direction through detection data analysis, when the mining of the working face is greatly influenced, the fault area of the fully-mechanized mining face is generally abandoned, the mining is not organized, the coal and gas outburst accidents can be avoided, the coal resource waste is large, the economic benefit is poor, and the development of the fully-mechanized mining face through the technology of the reverse fault area is influenced. In order to reduce resource waste caused by geological abnormality in the stoping process of a fully mechanized mining face, a stoping technology of a reverse fault affected area needs to be used as a first task of mine attack difficulty. Therefore, there is a need for a method for safely and efficiently constructing a fully mechanized coal mining face through a reverse fault group to improve the utilization rate of coal resources.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: the method for the fully mechanized mining face to safely and efficiently pass through the reverse fault group is provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a construction method for a fully mechanized mining face to safely and efficiently pass through a reverse fault group comprises the following steps:
s1, comprehensively analyzing data such as exposed fault of crossheading roadway excavation, drilling construction coverage and the like, and analyzing potential problems of the fully mechanized coal mining face through a reverse fault area;
s2, firstly, covering construction kilometer drill holes in the fully mechanized face reverse fault group influence area by using a directional drilling machine, then, covering construction bedding drill holes in the fully mechanized face reverse fault influence area by using a common drilling machine, and eliminating outburst of a reverse fault triangular belt and an upper tray and a lower tray;
s3, calculating the reverse fault data according to the drilling covering condition of the fully mechanized coal mining face, and determining the thickness of coal left at the bottom of the working face according to a construction scheme;
s4, when the fully mechanized mining face is subjected to cyclic prediction in the reverse fault area, comprehensively analyzing the fault extension condition by combining the constructed drilling hole, the fault condition revealed on site and the known fault forecast according to the coal body condition of the working face and the working face section schematic diagram drawn by the geodetic management part, and determining the positions and the number of the construction prediction holes and the detection holes and performing construction; when the prediction hole and the detection hole are constructed, if abnormal conditions occur, the encrypted drilling hole is constructed in the abnormal area for covering;
s5, before a reverse fault area is mined on a coal face, drilling holes in a roadway of a crossheading in advance; the measure holes and the drill holes in the working face construction are used as grouting holes for grouting, so that the coal body is reinforced, and abnormal gas emission caused by broken and side-striped coal body is prevented; and eliminating outburst of the construction discharge hole on a fault area during recovery.
In the step S4, the abnormal condition includes a change in coal thickness, a change in coal volume, or a fault plane being exposed.
The coal thickness variation means that the thickness variation of the coal body is more than 0.5 m; the coal body changes, namely soft coal appears or is broken and does not develop; the exposed fault plane refers to the appearance of cutting waste rock and remaining bottom coal.
The aperture of the prediction hole is 42mm, and the hole depth is 5-10 m; the aperture of the detection hole is 42mm, the hole depth is 10 m, the aperture of the discharge hole is 75mm, and the hole depth is not less than 15 m.
Compared with the prior art, the invention has the following beneficial effects: the comprehensive treatment scheme of full-coal-thickness coverage of the upper, middle and lower parts is realized by adopting a directional drilling machine to construct kilometer drill holes and a common drilling machine to construct bedding long drill holes to eliminate outburst of the reverse fault triangular belt and the upper and lower discs in the reverse fault (group) area of the fully-mechanized mining working face, an analysis mode of mutual verification of site and data is established by constructing the prediction holes and the detection holes, and the outburst of the construction discharge holes is eliminated for the fault area during mining, so that gas of the fully-mechanized mining working face does not change abnormally during mining of the reverse fault group area, the mining efficiency is improved, and the fully-mechanized mining working face is ensured to pass through the reverse fault group area safely and efficiently. The invention provides technical support for the fully-mechanized coal mining face to pass through the reverse fault group, and provides powerful technical guarantee for the mining of other fully-mechanized coal mining faces in geological abnormal areas in future.
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FIG. 1 is a geological profile analysis of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a construction kilometer drill hole covering a fully mechanized coal mining face reverse fault group affected area through a directional drilling machine in the embodiment of the invention;
FIG. 3 is a schematic diagram of covering construction bedding drilling of a region with poor extraction effect of kilometer drill holes in the fully mechanized coal mining face reverse fault influence range by using a common drilling machine in the embodiment of the invention;
FIG. 4 is a schematic diagram of the coverage of the fully mechanized coal mining face drill holes (kilometer drill holes + common drill holes) in the embodiment of the invention;
fig. 5 is a data table of a fully mechanized coal mining face according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all 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.
The invention provides a method for safely and efficiently passing a fully mechanized mining face through an inverse fault group, which is characterized in that a comprehensive treatment scheme of full coal thickness coverage of upper, middle and lower parts is realized by adopting a directional drilling machine to construct kilometer drill holes and a common drilling machine to construct bedding long drill hole to eliminate outburst of an inverse fault triangular belt and upper and lower discs in an inverse fault (group) area of the fully mechanized mining face, an analysis mode of mutual verification of site and data is established, and a construction discharge hole eliminates the outburst of the fault area, so that gas of the fully mechanized mining face does not change abnormally during the recovery of the inverse fault group area, the recovery efficiency is improved, and the safe and efficient passing of the fully mechanized mining face through the inverse fault group area is ensured. The technology provides technical support for the fully mechanized coal mining face to pass through the reverse fault group under similar conditions.
The concrete steps of the construction method for safely and efficiently passing the fully mechanized coal mining face through the reverse fault group are described below by taking a W2303 fully mechanized coal mining face of a certain coal mine as an example.
And S1, comprehensively analyzing data of exposed fault of crossheading roadway excavation, drilling construction coverage and the like, and analyzing potential problems of the fully mechanized coal mining face passing through a reverse fault area.
The ventilation management part, the ground survey management part, the drainage management part, the production technology management part and other parts comprehensively analyze data such as exposed faults of crossheading roadway tunneling and drilling construction coverage, analyze possible problems of the fully-mechanized coal mining face passing through a reverse fault area, make safeguard measures and ensure that the fully-mechanized coal mining face can realize safe and efficient mining in a reverse fault group area. The W2303 fully mechanized mining face is in an influence area of a reverse fault group (FW 23032-2, DF9 and Fw2302 x-2), and the geological analysis condition is shown in figure 1.
S2, firstly, using a directional drilling machine to cover and construct kilometer drill holes in the fully mechanized working face reverse fault group affected area, then using a common drilling machine to cover and construct bedding drill holes in the area with poor extraction effect of the kilometer drill holes in the fully mechanized working face reverse fault affected area according to the kilometer drill holes and extraction conditions, and eliminating outbursts of the reverse fault triangular belt and the upper and lower plates. The kilometer drilling hole is a long drilling hole constructed by using a directional drilling machine, the bedding drilling hole is a drilling hole from the coal seam constructed by using a common drilling machine to the coal seam, the extraction effect can be judged by calculating the extraction standard and comprehensively judging the coverage condition of the drilling hole, and a broken coal seam can be formed in a place with a poor extraction effect, so that outburst elimination can be realized by constructing the bedding drilling hole.
The method comprises the steps of covering the influence area of a fully mechanized mining face fault group (FW 23032-2, DF9 and Fw2302 x-2) by constructing kilometers of drill holes by using a directional drilling machine, covering the area with poor extraction effect of the kilometers of drill holes in the influence area of the fully mechanized mining face reverse faults by using a common drilling machine to construct bedding drill holes, and eliminating outbursts of the reverse fault triangular belt and the upper and lower discs. And a safe environment is provided for the fully mechanized mining face to rapidly pass through the reverse fault affected area.
Specifically, as shown in fig. 2, a W23032 roadway rock roadway 2# kilometer drill site construction kilometer drill hole performs comb-shaped covering and outburst elimination on a reverse fault FW23032-2 region; as shown in fig. 3, a W23031 roadway 12# kilometer drill site construction kilometer drilling hole realizes full coal thickness coverage and outburst elimination for the reverse fault DF9 area. As shown in fig. 4, a schematic view of the coverage of the fully mechanized coal mining face drill hole (kilometer drill hole + common drill hole).
And S3, calculating the reverse fault data according to the drilling covering condition of the fully mechanized mining face, and determining the thickness of the coal on the bottom of the working face according to the construction scheme.
After comprehensive analysis, the influence range, the extension condition and the bottom (top) coal remaining condition of the reverse fault on the working face of the fully mechanized coal mining working face during the mining period can be determined. As shown in fig. 5, is a data sheet of the fully mechanized coal mining face.
S4, when the fully mechanized mining face is subjected to cyclic prediction in the reverse fault area, comprehensively analyzing the fault extension condition by combining the constructed drilling hole, the fault condition revealed on site and the known fault forecast according to the coal body condition of the face and the working face section schematic diagram drawn by the geodetic management part, and determining the construction positions and the number of the prediction holes and the detection holes in each cycle. The prediction hole is a drilling hole constructed during prediction of the outburst risk of the working face, the hole diameter is 42mm, and the hole depth is 5-10 m. The detection holes are drilled holes for clearly detecting the extension condition of the fault, the hole diameter is 42mm, the detection holes are required to be constructed to the top and the bottom of a coal layer, and the coal thickness and the occurrence condition of the coal body in front of the mining surface are analyzed through detection data; when the prediction hole and the detection hole are constructed, if abnormal conditions occur, the encrypted drilling hole is constructed in the abnormal area to cover.
In the step S4, the abnormal condition includes a change in coal thickness, a change in coal volume, or a fault plane being exposed. The coal thickness variation means that the thickness variation of the coal body is more than 0.5 m; the coal body changes, namely soft coal appears or is broken and does not develop; the exposed fault plane refers to the appearance of cutting waste rock and remaining bottom coal.
S5, before a reverse fault area is mined on a coal face, drilling holes in a roadway of a crossheading in advance; the measure holes and the drill holes in the working face construction are used as grouting holes for grouting, so that the coal body is reinforced, and abnormal gas emission caused by broken and side-striped coal body is prevented; in addition, through the analysis mode of mutual verification of the site and data, the construction discharge hole eliminates the outburst on the fault layer area during the recovery, wherein the hole depth of the discharge hole is short, and the method is a measure hole of a local outburst prevention measure.
In addition, a consultation platform can be constructed, a firm and difficult communication group is established through calling a coordination meeting, a technical communication platform is constructed, the encountered problems and the problems which are possibly encountered can be consulted, related matters are coordinated among all service departments, and technical support is provided for the fully mechanized mining face to safely and quickly pass through the reverse fault area. Meanwhile, with the forward propulsion of the fully mechanized coal mining face, periodic summarization is periodically carried out. The comprehensive mining working face is mined to a position 20 meters away from the reverse fault, after the fault plane is exposed and after the fault area passes through, a coordination conference is held by a general engineer, and consultation is mainly carried out aiming at various problems and guarantee measures which are possibly met when the comprehensive mining working face is mined in the reverse fault area; when the problem which can not be solved is met in the back fault area mining period, after the related service department room requests the mine headquarters engineer, the related service department room calls a temporary coordination conference. And the conference summary of the coordination conference is used as an execution basis for the fully mechanized mining face to safely and efficiently pass through the reverse fault group.
An exchange group is established on exchange platforms such as WeChat and QQ, online exchange can be carried out all day long, and information is instantly shared. When abnormal conditions occur, the relevant business department room can provide a targeted solution in time. Accurate and error-free implementation site: when the fully mechanized coal mining face is mined to a position 20 meters away from the reverse fault area, technical personnel are organized by related business departments to follow up the shift on site, and whether abnormal changes exist in the aspects of coal occurrence, gas and the like of the working face is mainly determined; the construction unit is responsible for reporting information such as coal bodies, gas and the like of the working face to department rooms such as a dispatching command department and the like regularly by an inspection and acceptance staff of each work. When abnormal change occurs, the on-site acceptance staff and department office staff confirm the abnormal information together. And the double post report is executed, and the abnormal information is mastered more in place and more accurately.
And (3) executing strengthening measures in place: when the comprehensive mining working face performs each cycle prediction in the reverse fault area, the coal body situation of the working face is implemented by arranging the cadre to follow the shift by the outburst prevention team, and the positions and the number of the construction prediction holes and the detection holes are determined by referring to the working face section schematic diagram drawn by the ground survey management part. The whole coal thickness is covered by the prediction holes and the detection holes, and when the coal thickness changes (more than 0.5 m), the coal body changes (soft coal appears, the coal body is broken and does not grow), a fault plane is exposed (waste rock cutting occurs, bottom coal remains), and the like, encrypted drilling holes are constructed in abnormal areas for covering. And (4) before the coal face is stoped to the reverse fault area, drilling holes in the crossheading roadway in advance. The measure holes and the drill holes for working face construction are used as grouting holes for grouting, so that coal bodies are reinforced, and abnormal gas emission caused by broken and edge-broken coal bodies is prevented.
Safe and efficient passage through the reverse fault group: technical personnel collate field data and data to make a daily report of the progress of the fully mechanized mining face passing through the reverse fault (including the stoping progress, the gas condition of the working face during the stoping period, the gas exhausting and exhausting, the gas drainage, the outburst prevention measure execution, the coal body change of the working face, the extension of the reverse fault and the like), so that the stoping condition of the fully mechanized mining face can be intuitively known. Aiming at the current day extraction condition, an alternate day extraction plan and measures to be taken are determined, and a good foundation is laid for safely and efficiently passing through the reverse fault group.
The embodiment of the invention is developed during the period from the stoping of the fully mechanized working face W2303 of the coal mine West well area to the stoping of the reverse fault FW23032-2 (with the fall of 4 meters), and is successfully tried out, and the fully mechanized working face only passes through the reverse fault FW23032-2 area within 24 days. The technology is applied to the fully mechanized mining working face of the West well area W2303 through the reverse fault DF9 (with the difference of 4 meters) and the Fw2302x-2 (with the difference of 2-3 meters), and is successfully applied. The W2303 fully mechanized mining face safely advances to 396 meters in the reverse fault group (FW 23032-2 (with a fall of 4 meters), DF9 (with a fall of 4 meters) and Fw2302x-2 (with a fall of 2-3 meters)) totally, 128 days (including the time of maintenance shift) are consumed, the daily recovery progress reaches 3.3 meters/day (4 cutters), and no abnormity such as gas and the like occurs. The amount of the coal recovered on the W2303 fully-mechanized coal mining face is increased by about 100 ten thousand tons, the construction frame removing channel, the new cutting hole and the installation cost of the mining face are saved by about 1500 ten thousand yuan, and the economic benefit is remarkable.
The fully-mechanized coal mining face safely and efficiently provides powerful technical support for the stoping of other fully-mechanized coal mining faces in geological abnormal areas in mines in future through a reverse fault group method. The application of the safe and efficient reverse fault group passing technology of the fully-mechanized coal mining face can greatly shorten the retention time of the fully-mechanized coal mining face in the reverse fault area, ensure that the fully-mechanized coal mining face can safely pass through the reverse fault area, simultaneously create remarkable economic benefits and reduce the waste of coal resources.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A method for safely and efficiently passing a reverse fault group on a fully mechanized coal mining face is characterized by comprising the following steps:
s1, comprehensively analyzing data such as exposed fault of crossheading roadway excavation, drilling construction coverage and the like, and analyzing potential problems of the fully mechanized coal mining face through a reverse fault area;
s2, firstly, covering construction kilometer drill holes in the fully mechanized face reverse fault group influence area by using a directional drilling machine, then, covering construction bedding drill holes in the fully mechanized face reverse fault influence area by using a common drilling machine, and eliminating outburst of a reverse fault triangular belt and an upper tray and a lower tray;
s3, calculating the reverse fault data according to the drilling covering condition of the fully mechanized coal mining face, and determining the thickness of coal left at the bottom of the working face according to a construction scheme;
s4, when the fully mechanized mining face is subjected to cyclic prediction in the reverse fault area, comprehensively analyzing the fault extension condition by combining the constructed drilling hole, the fault condition revealed on site and the known fault forecast according to the coal body condition of the working face and the working face section schematic diagram drawn by the geodetic management part, and determining the positions and the number of the construction prediction holes and the detection holes and performing construction; when the prediction hole and the detection hole are constructed, if abnormal conditions occur, the encrypted drilling hole is constructed in the abnormal area for covering;
s5, before a reverse fault area is mined on a coal face, drilling holes in a roadway of a crossheading in advance; the measure holes and the drill holes in the working face construction are used as grouting holes for grouting, so that the coal body is reinforced, and abnormal gas emission caused by broken and side-striped coal body is prevented; and eliminating outburst of the construction discharge hole on a fault area during recovery.
2. The method of claim 1, wherein the abnormal situation in step S4 includes a change in coal thickness, a change in coal volume, or an exposure of fault plane.
3. The method for safely and efficiently passing through the reverse fault group of the fully mechanized coal mining face according to claim 2, wherein the coal thickness variation is that the coal thickness variation is more than 0.5 m; the coal body changes, namely soft coal appears or is broken and does not develop; the exposed fault plane refers to the appearance of cutting waste rock and remaining bottom coal.
4. The method for safely and efficiently passing the reverse fault group of the fully mechanized mining face according to claim 1, wherein the hole diameter of the prediction hole is 42mm, and the hole depth is 5-10 m; the aperture of the detection hole is 42mm, the hole depth is 10 m, the aperture of the discharge hole is 75mm, and the hole depth is not less than 15 m.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112943251A (en) * | 2021-03-01 | 2021-06-11 | 中国神华能源股份有限公司哈尔乌素露天煤矿 | Mining method for nearly horizontal opencast coal mine passing through reverse fault |
| CN113027440A (en) * | 2021-04-13 | 2021-06-25 | 陕西中太能源投资有限公司 | Construction method for fully mechanized coal mining face crossing oblique fault |
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