CN112963150A - Steering method for super-huge open coal mine mining area produced in full-mechanized mode - Google Patents
Steering method for super-huge open coal mine mining area produced in full-mechanized mode Download PDFInfo
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- CN112963150A CN112963150A CN202110302743.4A CN202110302743A CN112963150A CN 112963150 A CN112963150 A CN 112963150A CN 202110302743 A CN202110302743 A CN 202110302743A CN 112963150 A CN112963150 A CN 112963150A
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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
- E21C41/26—Methods of surface mining; Layouts therefor
- E21C41/28—Methods of surface mining; Layouts therefor for brown or hard coal
Abstract
The invention discloses a full-mechanized production steering method for an oversize open pit coal mine mining area, which comprises the following steps: dividing an oversize open pit coal mine into a plurality of mining areas; determining the reasonable width of the second mining area; when the working face is pushed to the boundary of the deep boundary of the second mining area, turning is started; planning the dumping during the sector turning, and calculating the condition of the abandoned carrying distance of the stripped objects during the sector turning, so as to ensure that the turning mode is the optimal mode. The invention selects the most suitable mining area steering method in the ultra-large open coal mine produced in full mechanization based on the comparison of transition modes during three steering, overcomes the stage that the working line is gradually lengthened in the steering process of pure sector steering in the finally selected L-shaped sector, reduces the stripping ratio, balances the north-south steering angle of the working line, and has the advantages of good inner row follow-up effect, small steering outer discharge amount, short steering distance and the like.
Description
Technical Field
The invention belongs to the technical field of open-pit mining, and particularly relates to a steering method for a super-huge open-pit coal mine mining area through full-mechanized production.
Background
When the mine production develops to a certain degree, adjacent mining areas need to be communicated in order to ensure the mine yield, the problem of mining area transition can be involved in the communication process, during the transition period, the mining procedure, the steering mode and the like have great influence on the production cost of the strip mine, and the problems of raw coal connection shortage, increase of the elevation difference of the transport distance, shortage of the internal discharge space, difficult reclamation condition and the like can be encountered sometimes. The mining area turning mode directly influences the external discharge capacity, the discarded haul-off distance of stripped objects, the output continuation, the production stripping ratio and the like during the transition period of the strip mine, and the overall economic benefit of the strip mine is seriously influenced, so when the strip mine turns in the mining area, the turning mode is required to be demonstrated and researched in advance. However, there may be a plurality of technically feasible mining area transition modes under the determined conditions such as strip mine geological resource conditions, production processes, mining area division schemes, and the like. However, under the condition that various technologies are feasible, an optimal feasible mining area transition scheme is determined from the aspects of economic benefit, technical management and the like by combining the aspects of a mining process of the strip mine, an internal discharge mode, an exploitation transportation system, total plane arrangement of the strip mine and the like when a mining area transition mode is selected. If the schedule of the stripping project in the transition period is not properly arranged, the yield of the strip mine is reduced and even the production is stopped because the coal mining is not continuous. In the transition period, the development of the transportation system is complicated, and if the arrangement and the management are not proper, the transportation distance is increased, the transportation system is disordered, and the normal production of the strip mine is influenced.
Disclosure of Invention
Based on the defects of the prior art, the invention solves the technical problem of providing the steering method for the super-huge open pit coal mine mining area with full mechanical production, has simple steps and good use effect, and can shorten the mining time and improve the mining efficiency.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention provides a full-mechanized production steering method for an oversize open pit coal mine mining area, which comprises the following steps:
the method comprises the following steps: dividing an oversize open pit coal mine into a plurality of mining areas, wherein a first mining area is positioned in the middle of a mine field and is pushed to the southwest direction, the first mining area turns to the north to enter a second mining area for mining after reaching the western boundary, the north mining area of the open pit coal mine is divided in parallel, and the second mining area is pulled again when turning;
step two: determining the reasonable width of the second mining area;
step three: when the working face is pushed to the boundary of the deep boundary of the second mining area, turning is started;
step four: planning the dumping during the sector turning, and calculating the condition of the abandoned carrying distance of the stripped objects during the sector turning, so as to ensure that the turning mode is the optimal mode.
Preferably, in step three, the turning is started from the mining project position at the beginning of the sector turning, the mining project position at the 45 ° of the sector turning and the mining project position at the end of the sector turning, respectively.
Preferably, in step two, the production scale of the strip mine is reduced with the reduction of the advancing strength of the working face under the condition of a given width of the mining area of the strip mine.
From the above, the fully-mechanized production oversized open pit coal mine mining area steering method selects the most applicable mining area steering method in the fully-mechanized production oversized open pit coal mine based on comparison of transition modes during three steering, overcomes the step that the working line is gradually lengthened in the steering process of pure sector steering in the finally selected L-shaped sector, reduces the stripping ratio, balances the north-south steering angle of the working line, and has the advantages of good inner discharge follow-up effect, small steering outer discharge amount, short steering distance and the like.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with the preferred embodiments, together with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a flow chart of a fully mechanized production of a turning method for a super-huge open pit coal mine mining area of the present invention.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which form a part of this specification, and which illustrate, by way of example, the principles of the invention. In the referenced drawings, the same or similar components in different drawings are denoted by the same reference numerals.
As shown in figure 1, the fully-mechanized oversized open pit coal mining area steering method comprises the following steps:
1) the super-huge open pit coal mine is divided into a plurality of mining areas, the first mining area is positioned in the middle of the mine field and is pushed to the southwest direction, the first mining area turns to the north to enter the second mining area for mining after reaching the western boundary, the north mining area of the open pit coal mine is divided in parallel, and the ditch is pulled again when the first mining area turns to the north.
2) Determining the reasonable width of its two-mining area
The mining area width is one of important technical indexes of the opencast coal mine, and for the occurrence condition that the inclination angle of a coal layer of the opencast coal mine is nearly horizontal, the coal layer thickness, the mining area width and the annual propulsion strength of the opencast coal mine jointly determine the production scale of the opencast coal mine. When the annual propulsion strength of the opencast coal mine is fixed, the mining area width is increased, and the production scale of the opencast coal mine is increased; conversely, the production scale of the strip mine decreases with decreasing working face propulsion strength for a given width of the panel.
3) L-shaped sector steering mining
When the working face is pushed to the boundary line of the deep part of the second mining area, the turning is started. When the working face continues to advance towards the west at the position, the inner soil discharge field continues to normally follow and can cover the second mining area, and in order to avoid secondary stripping after turning, the north side of the inner soil discharge field stops integrally advancing towards the west at the position. At the moment, the propulsion strength of the south part of the mining and stripping working side is enhanced, so that the whole mining and stripping working face rotates clockwise. The working surface of the inner soil discharge yard also rotates clockwise along with the stripping working surface so as to follow up the soil discharge.
4) L-shaped fan-shaped turning dumping
As is known from mining studies on sector turning of strip mines, the stripping ratio suddenly increases during turning, and the stripping amount per year sharply increases, so that it is necessary to plan the dumping during sector turning, calculate the discarded haul-off distance of the stripped objects during sector turning, and ensure that the turning mode is the optimal mode.
For the second step, two methods are provided for determining the reasonable mining area width, wherein the economic rationality is used for determining the mining area width, and the technical feasibility is used for determining the mining area width
And researching the three key positions in the step three, namely the mining engineering position when the sector steering is started, the mining engineering position when the sector steering is 45 degrees and the mining engineering position when the sector steering is finished.
In the specific embodiment, a certain strip mine is divided into 5 mining areas, the first mining area is located in the middle of a mine field, the first mining area is propelled towards the west, and the first mining area is turned to the north by 90 degrees after reaching the western boundary and enters the second mining area for mining. The strip mine adopts a sector and right-angle steering mode to steer, and the steering is started when the coal working face is pushed to a boundary line at the deep part of the second mining area. When the working face continues to advance towards the west at the position, the inner soil discharge field continues to normally follow and can cover the second mining area, and in order to avoid secondary stripping after turning (the covering time is less than 5a), the north side of the inner soil discharge field stops integrally advancing towards the west at the position. At the moment, the propulsion strength of the south part of the mining and stripping working side is enhanced, so that the whole mining and stripping working face rotates clockwise. The working surface of the inner soil discharge yard also rotates clockwise along with the stripping working surface so as to follow up the soil discharge.
The earth surface of the first mining area is propelled towards the west, the slope expansion of the second mining area is started after the coal roof of the main coal mining layer reaches the western boundary, the lower part of the first mining area is strengthened to be propelled from the south to form sector steering, the slope expansion of the second mining area is completed, and the steering is finished. The specific operation is as follows:
the north is divided into three mining areas, the direction is changed from a first mining area to a second mining area, the surface mining range of the strip mine exceeds the western surface boundary of the second mining area, mining and discharging are tense during the direction changing period, and in order to reduce the external discharge capacity as much as possible, a steep slope mode is adopted to analyze the relation of mining and discharging during the direction changing period.
The steep slope pattern is as follows: the stope working side adopts a mode that 1 working flat disc and 1 transportation flat disc are combined with the step, and working equipment is arranged on two sides of the step to mine towards the middle part; the working side of the waste dump adopts a mode that 1 working platform and 1 transportation platform are combined into a step. When the steep slope is adopted, the slope angle of the whole slope of the working face is 10.8 degrees, and the slope angle of the step of the refuse dump is 17.2 degrees.
The following is set forth from three turn-by-turn positions:
1) steering start position
The inner dump work line can be propelled west near the steering shaft to the start position of steering.
2) Steering transition position
The turn transition position is the engineering position from the start of the turn to the completion of the turn. From turning to, the working face propelled towards the west gradually combines the walls, and gradually expands the walls towards the second mining area. Because the surface width of the second mining area is about 2.2km, the surface width of the first mining area is about 1.9km, and the stripping ratio is increased during the steering process.
Steering process position 01: the stripping steps above the top plate of the main mining coal seam (4 coal) are all combined, and the stripping steps above the 4 coal in the secondary mining area are all opened.
Steering process position 02: on the basis of the turning position 01, the working face of the first mining area starts to turn in a fan shape, the propulsion of the south working line is accelerated, and the end walls of the second mining area continue to be gradually opened.
Steering process position 03: on the basis of the turning position 02, the working face of the first mining area continues to turn in a fan shape, the propulsion of the south working line is accelerated, and the end slope of the second mining area continues to be opened.
Steering process position 04: on the basis of the turning position 03, the working face of the first mining area continues to turn in a fan shape, the propulsion of the south working line is accelerated, and the end slope of the second mining area continues to be opened. When the position is finished, the first mining area finishes mining, and the north part of the second mining area completely finishes slope expansion.
3) Steering completion position
When the position is turned to the transition position 04, the first mining area finishes mining, the second mining area finishes slope expansion, but because the inner drainage relation is tense, one side of the inner soil discharge field, which is close to the second mining area, is discharged to form the final inner soil discharge field slope surface during the turning transition period, so that when the second mining area continues to push to the north, the inner soil discharge field needs to be gradually restored to a normal working flat plate. And completing steering when the inner soil discharge field is completely restored to a normal working flat plate.
The average stripping ratio during steering obtained by the method is 5.92m3The stripping amount per year is about 118.40 Mm/t calculated according to the production scale of 20.0Mt/a3The turning time is about 8.6 years, the maximum turning discharge elevation is 1450 m and about 69.57Mm3The comprehensive lifting height of the stripping materials is reduced by 15m, the comprehensive transport distance is reduced by 2.2km, and the transportation cost is reduced by about 3.36 hundred million yuan.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (3)
1. A full-mechanized production steering method for an oversize open pit coal mine mining area is characterized by comprising the following steps:
the method comprises the following steps: dividing an oversize open pit coal mine into a plurality of mining areas, wherein a first mining area is positioned in the middle of a mine field and is pushed to the southwest direction, the first mining area turns to the north to enter a second mining area for mining after reaching the western boundary, the north mining area of the open pit coal mine is divided in parallel, and the second mining area is pulled again when turning;
step two: determining the reasonable width of the second mining area;
step three: when the working face is pushed to the boundary of the deep boundary of the second mining area, turning is started;
step four: planning the dumping during the sector turning, and calculating the condition of the abandoned carrying distance of the stripped objects during the sector turning, so as to ensure that the turning mode is the optimal mode.
2. The fully mechanized method of turning a super large open pit coal mine according to claim 1, wherein in step three, the turning is started from a mining project location at the beginning of the sector turning, a mining project location at 45 ° of the sector turning, and a mining project location at the end of the sector turning, respectively.
3. The method of turning a super large open pit coal mine according to claim 1, wherein in step two, the production scale of the open pit mine is decreased with the decrease of the working face pushing strength under the given conditions of the open pit coal mine mining area width.
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| CN202110302743.4A CN112963150A (en) | 2021-03-22 | 2021-03-22 | Steering method for super-huge open coal mine mining area produced in full-mechanized mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115964790A (en) * | 2023-01-06 | 2023-04-14 | 辽宁工程技术大学 | Method for determining degree of advance of strip mine coal mining working line under end slope mining condition |
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| US5782539A (en) * | 1995-11-16 | 1998-07-21 | Peterson; Randall D. | Wall-to-wall surface mining process |
| CN107687342A (en) * | 2017-08-21 | 2018-02-13 | 中国矿业大学 | A kind of open coal mine draws bucket shovel active line segmentation alternative expression exploiting field forward method |
| CN112364474A (en) * | 2020-09-18 | 2021-02-12 | 辽宁工程技术大学 | Mining scheme optimization method based on strip mine partition mining process |
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2021
- 2021-03-22 CN CN202110302743.4A patent/CN112963150A/en active Pending
Patent Citations (3)
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|---|---|---|---|---|
| US5782539A (en) * | 1995-11-16 | 1998-07-21 | Peterson; Randall D. | Wall-to-wall surface mining process |
| CN107687342A (en) * | 2017-08-21 | 2018-02-13 | 中国矿业大学 | A kind of open coal mine draws bucket shovel active line segmentation alternative expression exploiting field forward method |
| CN112364474A (en) * | 2020-09-18 | 2021-02-12 | 辽宁工程技术大学 | Mining scheme optimization method based on strip mine partition mining process |
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| 崔宏伟等: "平朔东露天矿采区转向方法研究", 《露天采矿技术》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115964790A (en) * | 2023-01-06 | 2023-04-14 | 辽宁工程技术大学 | Method for determining degree of advance of strip mine coal mining working line under end slope mining condition |
| CN115964790B (en) * | 2023-01-06 | 2024-04-09 | 辽宁工程技术大学 | Determination method for opencut mining working line propelling degree under end slope mining condition |
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