CN111396055A - Method for arranging side coal pressing mining chamber of strip mine - Google Patents

Method for arranging side coal pressing mining chamber of strip mine Download PDF

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Publication number
CN111396055A
CN111396055A CN202010210412.3A CN202010210412A CN111396055A CN 111396055 A CN111396055 A CN 111396055A CN 202010210412 A CN202010210412 A CN 202010210412A CN 111396055 A CN111396055 A CN 111396055A
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mining
coal
chamber
side wall
slope
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CN111396055B (en
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曾祥玉
王忠鑫
马培忠
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Ccteg Shenyang Engineering Co ltd
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Ccteg Shenyang Engineering Co ltd
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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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F15/00—Methods or devices for placing filling-up materials in underground workings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere

Abstract

The invention provides a method for arranging pit chambers for mining strip mine slope-pressing coal, which solves the problems of large coal pillar quantity and low recovery rate of slope-pressing resources in the traditional slope-pressing coal mining recovery mode, and adopts the technical scheme that the method comprises the following steps: step 1, determining chamber layout parameters, step 2, calculating the reserved width of a coal pillar, step 3, determining the drilling angle of a side wall coal mining machine, and step 4, verifying the parameters; step 5, chamber mining and filling: the first-stage mining of the side coal pressing chamber is firstly carried out, the chamber filling operation is carried out after the chamber mining in the same direction is completed, after the filling body is completely solidified, the second-stage mining is carried out by taking a compensation angle with the drilling angle of the original chamber as the drilling angle, the new chamber and the original chamber form a cross shape, and finally the chamber gob area is filled. The method obviously increases the effective mining total depth of the chamber, greatly improves the recovery rate of the side wall resources, and reduces the potential safety hazards of natural ignition of the overlying coal seam, rock mass landslide and the like.

Description

Method for arranging side coal pressing mining chamber of strip mine
Technical Field
The invention relates to the technical field of strip mining, in particular to a method for arranging an open-pit side coal-pressing mining chamber, which is suitable for arranging the mining chamber and reserving coal pillars.
Background
At present, in open pit mining in China, the side wall pressure covering coal resource amount is a part of the industrial reserve of an open pit coal mine, and is influenced by mining boundaries, slope angles and coal seam occurrence conditions, so that the side wall of the open pit coal mine with a nearly horizontal and slowly inclined coal seam has the phenomenon of pressure covering resource amount, and the side wall pressure covering resource is required to be effectively recycled to avoid resource waste. The traditional side slope coal-pressing mining and recovering mode mainly comprises the following steps: steep wall mining, side wall coal mining machine mining, well exposure coordinated mining and well working gallery mining, wherein the side wall coal mining machine mining mode is applied more generally, the mining chamber arrangement direction is generally perpendicular to the side wall of the strip mine, coal pillars are reserved among chambers, the chamber mouth is plugged after the chamber mining is finished, and potential safety hazards such as natural ignition, rock mass landslide and the like exist due to the influence of mining disturbance. The mining chamber arrangement method has the following problems: because the chamber is arranged on the vertical side, coal pillars between chambers are parallel to the chamber, and the reserved depth of the coal pillars is the same as the mining depth of the chamber, the coal pillar quantity is larger, and the recovery rate of the side-wall pressing resources is lower.
Disclosure of Invention
The invention aims to provide a method for arranging an open-pit mine slope coal pressing mining chamber. The problems that in a traditional side wall pressing coal mining and recycling mode, because coal pillars between chambers are parallel to the chambers, the reserved depth of the coal pillars is the same as the mining depth of the chambers, the quantity of the coal pillars is large, and the recycling rate of side wall pressing resources is low are solved, the coal bed can be efficiently recycled, and potential safety hazards such as natural ignition and rock body landslide of the pressing coal bed are reduced.
The technical scheme of the invention is as follows: the method for arranging the pit chamber for mining the strip mine slope coal comprises the following steps:
step 1, determining chamber layout parameters: firstly, marking the mining range of the slope coal pressing, and then comprehensively determining the mining width, the mining height and the mining depth of the chamber by combining the parameters of the slope coal mining machine and the occurrence conditions of the slope coal layer.
Step 2, calculating the coal pillar reserved width: formula B according to a.h.wilson theory1=（KB2+0.02 MH)/(4-K), calculating the width of the coal pillar, wherein B1Is the width of the coal pillar, m; b is2The width of the chamber is adopted, m; m is the chamber mining height M; h is occurrence depth, m; k is a safety factor; the mining width is determined by the width of a cutting head of the side wall coal mining machine, the mining height is comprehensively determined according to the thickness of a mining coal bed and the maximum mining height of the side wall coal mining machine, and the mining depth is comprehensively determined according to the mining coal bed thickness and the maximum mining depth of the side wall coal mining machine.
Step 3, determining the drilling angle of the side wall coal mining machine: determining the mining depth through the selected slope coal mining machine, and finally determining the drilling angle range of the slope coal mining machine by combining the slope coal pressing mining range.
Step 4, parameter verification: establishing a side pressure coal mining model by using numerical simulation software for establishing the side pressure coal mining model, inputting parameters formulated in the steps to perform mining simulation, analyzing the stability of the chamber, the coal pillar and the side slope, performing formulated parameter verification, and passing the verification if the safety requirement is met; and if the stability does not meet the safety requirement, returning to the step 1 to readjust the parameters.
Step 5, chamber mining and filling: firstly, performing first-stage mining of a side coal pressing chamber by using a side coal mining machine according to a determined drilling angle, withdrawing mining equipment to the outside of the chamber after the mining of the chamber is finished, moving the equipment to the next chamber port, and continuing mining according to the same drilling angle, wherein a strip-shaped coal pillar is reserved between the two chambers; when the chambers in the same direction are completely mined, chamber filling operation is carried out, and a goaf of the chamber is filled with gangue materials and cement filling materials, so that the coal wall is isolated from air and the stability of the side slope is enhanced; after the filling body is completely solidified, taking the original chamber opening as a starting point after reaching a certain supporting strength, and taking a supplementary angle with the drilling angle of the original chamber as a drilling angle to carry out second-stage mining to form a new chamber, wherein the new chamber and the original chamber form a cross shape, the new chamber can penetrate through part of strip-shaped coal pillars and filling bodies in the mining process, the original strip-shaped coal pillars are cut into diamond-shaped coal pillars, and if the extracted original coal contains too much filling material to influence the coal quality, washing treatment is needed; and finally, filling a chamber goaf after all chambers in the mining area are mined.
The invention has the advantages and beneficial effects that:
(1) according to the arrangement method of the pit chamber for strip mine side coal pressing mining, provided by the invention, the parameters of the pit chamber, the width of the coal pillar and the drilling angle are reasonably determined, the strip-shaped coal pillar is finally converted into the diamond-shaped coal pillar, the originally remained strip-shaped coal pillar part is converted into mining coal seam resources, the effective mining total depth of the pit chamber is obviously increased, and the side resource recovery rate is greatly improved.
(2) According to the arrangement method of the strip mine side coal pressing mining chamber, the communication between air and coal pillars is isolated by filling the original chamber and the new chamber gob area, the hidden danger of natural ignition is eliminated, and meanwhile, the effect of improving the side slope safety is very obvious.
(3) The method for arranging the pit chamber for mining the open-pit mine slope pressed coal provided by the invention has no technical research in China at present, and the method fills the blank of the mining technology of the open-pit mine slope pressed coal in China.
Drawings
The invention will be further explained with reference to the drawings.
Fig. 1 is a flow diagram of the strip mine highwall coal mining chamber arrangement method of the present invention;
fig. 2 is a schematic longitudinal cross-sectional view of a strip mine highwall coal-pressing mining chamber arrangement provided by the present invention;
FIG. 3 is a schematic transverse cross-sectional view of a chamber layout for a first stage of mining conditions of the engineering evolution process provided by the present invention;
fig. 4 is a schematic transverse cross-sectional view of a first stage mining chamber fill state of the engineering evolution process provided by the present invention;
FIG. 5 is a schematic transverse cross-sectional view of a chamber layout for a second stage mining state of the engineering evolution process provided by the present invention;
fig. 6 is a schematic transverse cross-sectional view of a second stage mining chamber fill state of the engineering evolution process provided by the present invention.
The numbers in the figure illustrate 1-overburden, 2-mined coal, 3-chamber, 4-diamond coal, 5-bar coal, 6-drilling angle (α), 7-pack material.
Detailed Description
The invention is described in detail with reference to fig. 1-6. The embodiment of the invention relates to a method for arranging a side-slope coal-pressing mining chamber of a strip mine, the production strip mine is completely internally drained, the distance between a working side and an internal drainage soil yard is 150m, a side-slope coal-pressing mining area is determined at one side end side, the length of the area is 3.0km, the width of the area is 0.15km, and the area of the area is 0.45km2. The area comprises a layer of mined coal seam 2, the average thickness of the coal seam is 4m, the dip angle of the coal seam is 1-3 degrees, the average thickness of the overlying strata 1 is 30m, and the side slope angle is 32 degrees. The invention is applied to the implementation of the highwall coal-pressing mining project. As shown in fig. 1, the main steps are: firstly, determining the arrangement parameters of the side wall coal pressing mining chamber; calculating the reserved width of the coal pillar according to parameters such as the physical and mechanical properties of the side pressing coal rock, the occurrence depth of the coal bed, the width of the chamber, the height of the chamber and the like; then determining the drilling angle of the side wall coal mining machine by combining the limit of the side wall coal pressing mining range and the mining depth of the coal mining machine; performing parameter verification, returning if the stability does not meet the safety requirement, and readjusting the parameters; and (3) carrying out chamber mining and filling, carrying out filling operation after chamber mining in the same direction is finished, and finally carrying out chamber mining by taking the supplementary angle of the previously determined drilling angle as a new drilling angle, wherein the strip-shaped coal pillars can penetrate through part of the coal pillars and the filling bodies in the chamber mining process in the direction to cut the strip-shaped coal pillars into rhombic coal pillars.
The method specifically comprises the following steps:
the method comprises the following steps of 1, determining chamber arrangement parameters, namely firstly drawing a side wall coal pressing mining range, and then comprehensively determining the mining width, the mining height and the mining depth of the chamber by combining parameters of a side wall coal mining machine and side wall coal seam occurrence conditions, wherein the mining width is determined by the width of a cutting head of the side wall coal mining machine, the mining height is comprehensively determined according to the thickness of a mining coal seam and the maximum mining height of the side wall coal mining machine, the mining depth is comprehensively determined according to the side wall coal pressing mining range and the maximum mining depth of the side wall coal mining machine, the mining height of the chamber is determined to be 4m, the mining width is 3.3m, the mining depth is not more than 150m/sin α, and the maximum mining depth is not more than 300m, the side wall coal pressing mining chamber arrangement is determined, and as shown in a longitudinal section schematic diagram of the open pit side coal pressing mining chamber arrangement, firstly, the boundaries of an overlying rock stratum 1 and a mining 2 in the side wall coal mining range are determined, and then the size parameters of the mining chamber 3 are comprehensively determined according.
Step 2, calculating the coal pillar reserved width: according to the theory of A.H.Wilson (or called: A.H.Wilson), the formula B is used1=（KB2+0.02 MH)/(4-K), calculating the width of the coal pillar, wherein B1Is the width of the coal pillar, m; b is2The width of the chamber is adopted, m; m is the chamber mining height M; h is occurrence depth, m; k is a safety factor. The determined parameters of the chamber mining width, the mining height, the occurrence depth and the like are substituted into an A.H.Wilson theoretical calculation formula to obtain that the coal pillar width is 1.2m, as shown in figure 5, as the chamber can form a cross shape in the mining process, and part of strip-shaped coal pillars 5 can be cut into diamond-shaped coal pillars 4, the coal pillar width is temporarily increased to 1.5m for ensuring the stability of the chamber and a side slope.
Step 3, determining the drilling angle of the side wall coal mining machine: the mining depth of the selected side wall coal mining machine is limited by the mining efficiency and the navigation positioning precision, the mining depth of the side wall coal mining machine is also a determined numerical value once the brand and the model of the side wall coal mining machine are determined, the range of the drilling angle 6 (namely the included angle between the chamber and the slope surface of the side wall in the horizontal direction) of the side wall coal mining machine is comprehensively determined according to the mining depth numerical value and the geometric dimension of the mining range of the side wall coal pressing, and then the drilling angle of the side wall coal mining machine is determined to the maximum extent by combining the time-space relationship between the side wall coal pressing working side and the normal propelling working side of the strip mine. The maximum mining depth of the side wall coal mining machine selected in the embodiment is 300m, the efficiency is best within the depth range of mining 100-200 m, meanwhile, the tracking distance and the minimum safety distance of an inner soil discharge field and a working side are considered to be reserved, the width of a mining area is determined to be 100m, the maximization of the side wall coal pressing recovery rate is considered on the basis, and finally, the drilling angle 6 of the side wall coal mining machine is determined to be 70 degrees, namely the included angle between a chamber and a side wall surface in the horizontal direction is 70 degrees, and the drilling angle of the chamber in the other direction is 110 degrees.
Step 4, parameter verification: collecting physical and mechanical parameters of the slope coal rock by methods of investigation, statistics, experiments and the like, establishing a slope coal pressing exploitation model by using a flac-3D system or other conventional numerical simulation software for establishing the slope coal pressing exploitation model, inputting parameters formulated in the steps for exploitation simulation, analyzing the stability of the underground chamber, the coal pillar and the slope, performing formulated parameter verification, and performing slope coal pressing exploitation according to the formulated parameters through verification if the safety requirements are met; and if the stability does not meet the safety requirement, returning to the step 1 to readjust the parameters. And simulating that no stress concentration damage area exists, and performing slope coal pressing mining according to the formulated parameters.
Step 5, chamber mining and filling: as shown in fig. 3, firstly, a first-stage mining is carried out on a side coal pressing chamber 3 by using a side coal mining machine according to a determined drilling angle 6, the side coal mining machine starts to carry out the side coal pressing chamber mining at a drilling angle of 70 degrees, after the chamber mining is finished, mining equipment is withdrawn out of the chamber, then the side coal mining machine is moved to the next chamber port to continue mining according to the same drilling angle, and a strip-shaped coal pillar 5 is reserved between the two chambers; as shown in fig. 4, when the chamber is completely mined in the same direction, chamber filling operation is performed, and a goaf of the chamber is filled with gangue materials and cement filling materials 7, so that the coal wall is isolated from air and the stability of a side slope is enhanced; as shown in fig. 5, after the filling body is completely solidified, a second-stage mining is carried out by taking the original chamber opening as a starting point and taking a supplementary angle with the original chamber drilling angle 6 as a drilling angle of 110 degrees to form a new chamber, the new chamber and the original chamber form a cross shape, the new chamber can penetrate through part of strip-shaped coal pillars 5 and filling materials 7 in the mining process, the original strip-shaped coal pillars are cut into diamond-shaped coal pillars 4, if the extracted raw coal contains too much filling materials to affect the coal quality, washing treatment is required, and the extracted raw coal is separated into gangue and the filling materials through washing treatment to ensure the coal quality; finally, as shown in fig. 6, after the chambers in the mining area are completely mined, the new chamber gob area is filled to ensure the slope stability and prevent the spontaneous combustion of the slope coal seam.
In conclusion, the object of the present invention is achieved.

Claims (1)

1. A method for arranging pit chambers for strip mine slope coal pressing mining is characterized by comprising the following steps:
step 1, determining chamber layout parameters: firstly, marking a side wall coal pressing mining range, and comprehensively determining the mining width, the mining height and the mining depth of the chamber by combining parameters of a side wall coal mining machine and the occurrence conditions of a side wall coal bed;
step 2, calculating the coal pillar reserved width: formula B according to a.h.wilson theory1=（KB2+0.02 MH)/(4-K), calculating the width of the coal pillar, wherein B1Is the width of the coal pillar, m; b is2The width of the chamber is adopted, m; m is the chamber mining height M; h is occurrence depth, m; k is a safety factor; the mining width is determined by the width of a cutting head of the side wall coal mining machine, the mining height is comprehensively determined according to the thickness of a mining coal bed and the maximum mining height of the side wall coal mining machine, and the mining depth is comprehensively determined according to the mining coal bed thickness and the maximum mining depth of the side wall coal mining machine;
step 3, determining the drilling angle of the side wall coal mining machine: determining the mining depth through the selected slope coal mining machine, and finally determining the drilling angle range of the slope coal mining machine by combining the slope coal pressing mining range;
step 4, parameter verification: establishing a side pressure coal mining model by using numerical simulation software for establishing the side pressure coal mining model, inputting parameters formulated in the steps to perform mining simulation, analyzing the stability of the chamber, the coal pillar and the side slope, performing formulated parameter verification, and passing the verification if the safety requirement is met; if the stability does not meet the safety requirement, returning to the step 1 to readjust the parameters;
step 5, chamber mining and filling: firstly, performing first-stage mining of a side coal pressing chamber by using a side coal mining machine according to a determined drilling angle, withdrawing mining equipment to the outside of the chamber after the mining of the chamber is finished, moving the equipment to the next chamber port, and continuing mining according to the same drilling angle, wherein a strip-shaped coal pillar is reserved between the two chambers; when the chambers in the same direction are completely mined, chamber filling operation is carried out, and a goaf of the chamber is filled with gangue materials and cement filling materials, so that the coal wall is isolated from air and the stability of the side slope is enhanced; after the filling body is completely solidified, taking the original chamber opening as a starting point after reaching a certain supporting strength, and taking a supplementary angle with the drilling angle of the original chamber as a drilling angle to carry out second-stage mining to form a new chamber, wherein the new chamber and the original chamber form a cross shape, the new chamber can penetrate through part of strip-shaped coal pillars and filling bodies in the mining process, the original strip-shaped coal pillars are cut into diamond-shaped coal pillars, and if the extracted original coal contains too much filling material to influence the coal quality, washing treatment is needed; and finally, filling a chamber goaf after all chambers in the mining area are mined.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112796760A (en) * 2021-04-13 2021-05-14 中煤科工能源科技发展有限公司 Strip mine non-stripping mining method, device and system using side slope coal mining machine
CN113236254A (en) * 2021-06-25 2021-08-10 中国矿业大学 Filling mining method for end slope thick coal seam with large inclination angle of strip mine
CN114320298A (en) * 2022-01-05 2022-04-12 国家能源集团国源电力有限公司 Coal mining method

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CN104790956A (en) * 2015-03-13 2015-07-22 余绍泽 Remote control heading machine tunnel type or fully-mechanized top coal exploitation end slope coal technology
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CN109882240A (en) * 2019-03-29 2019-06-14 中国矿业大学 A kind of outdoor end side pressure coal filling mining system
CN109882179A (en) * 2019-03-29 2019-06-14 中国矿业大学 A kind of outdoor end side pressure coal filling mining design method
CN210105863U (en) * 2019-06-17 2020-02-21 杨瑞宙 Adopt cave filling structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104389606A (en) * 2014-09-23 2015-03-04 海西博奥工程有限公司 Novel mine mining technical scheme based on environment protection
CN104790956A (en) * 2015-03-13 2015-07-22 余绍泽 Remote control heading machine tunnel type or fully-mechanized top coal exploitation end slope coal technology
CN109026006A (en) * 2018-09-20 2018-12-18 内蒙古煤矿设计研究院有限责任公司 Exploitation open pit slope covers the new method of mineral products
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CN210105863U (en) * 2019-06-17 2020-02-21 杨瑞宙 Adopt cave filling structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112796760A (en) * 2021-04-13 2021-05-14 中煤科工能源科技发展有限公司 Strip mine non-stripping mining method, device and system using side slope coal mining machine
CN113236254A (en) * 2021-06-25 2021-08-10 中国矿业大学 Filling mining method for end slope thick coal seam with large inclination angle of strip mine
CN113236254B (en) * 2021-06-25 2022-06-14 中国矿业大学 Filling mining method for end slope thick coal seam with large inclination angle of strip mine
CN114320298A (en) * 2022-01-05 2022-04-12 国家能源集团国源电力有限公司 Coal mining method
CN114320298B (en) * 2022-01-05 2024-03-01 国家能源集团国源电力有限公司 Coal mining method

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