CN111396055B - 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 PDFInfo
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- CN111396055B CN111396055B CN202010210412.3A CN202010210412A CN111396055B CN 111396055 B CN111396055 B CN 111396055B CN 202010210412 A CN202010210412 A CN 202010210412A CN 111396055 B CN111396055 B CN 111396055B
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- 238000005065 mining Methods 0.000 title claims abstract description 185
- 239000003245 coal Substances 0.000 title claims abstract description 163
- 238000003825 pressing Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005553 drilling Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims description 12
- 238000012795 verification Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 6
- 239000011435 rock Substances 0.000 abstract description 5
- 230000002269 spontaneous effect Effects 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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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 spontaneous ignition of the overburden coal bed, rock mass landslide and the like.
Description
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 spontaneous combustion 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, due to the fact that 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 layer can be efficiently recycled, and potential safety hazards such as spontaneous combustion ignition and rock body landslide of the pressing coal layer 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.
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-pressing coal 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 spontaneous combustion ignition is eliminated, and the effect of improving the side slope safety is also 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 sequence numbers in the figures illustrate: 1-overburden, 2-mining coal bed, 3-chamber, 4-diamond coal pillar, 5-strip coal pillar, 6-drilling angle (alpha), 7-filling 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 combining the limit of the side wall coal pressing mining range and the mining depth of the coal mining machine,determining the drilling angle of the side wall 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:
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. 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. And determining the mining height of the chamber to be 4m, the mining width to be 3.3m, the mining depth to be not more than 150m/sin alpha and not more than 300m of the maximum mining depth of the side wall coal mining machine. The highwall coal-pressing mining chamber layout is characterized in that as shown in a longitudinal section schematic diagram of the strip mine highwall coal-pressing mining chamber layout in fig. 2, firstly, boundaries of an overlying strata 1 and a mining coal seam 2 in a highwall coal-pressing mining range are determined, and then, size parameters of a mining chamber 3 are comprehensively determined according to mining parameters of a highwall coal mining machine and the thickness of the mining coal seam 2.
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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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 |
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