CA2986062C - Fully mechanized mining-filling mixed mining working face filling section length determination method - Google Patents
Fully mechanized mining-filling mixed mining working face filling section length determination method Download PDFInfo
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- CA2986062C CA2986062C CA2986062A CA2986062A CA2986062C CA 2986062 C CA2986062 C CA 2986062C CA 2986062 A CA2986062 A CA 2986062A CA 2986062 A CA2986062 A CA 2986062A CA 2986062 C CA2986062 C CA 2986062C
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- filling
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- 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
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- 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
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
Abstract
Disclosed is a method for determining a length of a filling section in a fully mechanized mining-filling mixed mining working face wherein according to the production capacity requirement of the mine, total length of the working face is determined. According to the principle that the daily production amount of gangue in a rock protection layer working face is equal to the mass of filling material filled in a goaf of the filling section, a length range of working face of the filling section is preliminarily determined. The working face length of the filling section is determined according to the overlying rock fractures and strata movement characteristics of the on-site working face. The method promotes a "mining, selecting, filling and mining" integrated environment-friendly mining recycling mode, wherein the underground gangue in the coal mine does not go out of the mine, the gangue is cleaned, selected, and refilled into the goaf.
Description
FULLY MECHANIZED MINING-FILLING MIXED MINING WORKING FACE FILLING
SECTION LENGTH DETERMINATION METHOD
Technical Field The present invention relates to the technical field of filling coal mining, and more particularly to a method for determining a length of a filling section of a fully mechanized coal mining-filling mixed mining working face.
Related Art In recent years, as a coal mine green mining technology for solving the "three-under"
(i.e. under buildings, railways and water) coal mining problems, the solid filling coal mining technology has already been widely popularized and used in multiple mine areas in China and has successively liberated a great number of coal resources; meanwhile, underground waste rocks are not raised out of the mine, so that the stack of the waste rocks on the ground .. is reduced, and the pollution-free and green concept is further reinforced;
and more and more mine areas employ an underground coal separation technology to realize a green circular mining integration technology of separating the underground waste rocks and backfilling a gob with the separated waste rocks. However, with the high-strength mining of the coal resources, a lot of coal mines encounter coal seams with low permeability and high gas burst risk during the subsequent extension mining of the coal seam; and the mining of said coal seam is dangerous, and the mining cost of the coal seams is high, which severely affects the service life of the coal mine. Therefore, a technology for mining an upper rock protection layer, pre-extracting gas of a protected coal seam, utilizing the waste rocks of the rock protection layer as a filling material to backfill the gob of a protected layer and achieving a purpose of not raising the waste rocks out of the mine and simultaneously extracting the coal and the gas has emerged at the right moment; and in this technology, in consideration of a coal mine yield and a gas drainage effect, the protected layer is mined by employing a fully mechanized coal mining-filling mixed working face.
Date Recue/Date Received 2022-05-13 The reasonable design of a length of a filling section of the fully mechanized coal mining-filling mixed mining working face has important effects on the timely treatment of the underground waste rocks, successful implementation of the filling coal mining, the gas drainage effect, and the like. Therefore, the research on a method for determining the length of the filling section of the fully mechanized coal mining-filling mixed mining working face becomes an indispensable research means and research method for the fully mechanized coal mining-filling mixed mining under similar conditions and has important practical significance and wide application prospect.
SUMMARY
In view of the problems in the prior art, the present invention is directed to a method for determining a length of a filling section of a fully mechanized coal mining-filling mixed mining working face, which is simple, safe, reliable and high in performance of engineering appliance.
The method for determining the length of the filling section of the fully mechanized coal mining-filling mixed mining working face includes; firstly, designing a total length of a mixed working face according to the production capacity requirement of a mine; secondly, primarily designing a range of the length of the filling section of the fully mechanized coal mining-filling mixed mining working face according to a principle that a daily output of the waste rocks of a rock protection layer working face is equal to a mass of a filling material for filling a gob of the filling section of the fully mechanized coal mining-filling mixed mining working face; and finally, determining the length of a filling section working face according to the requirements of the development of on-site cover rock cracks of the mixed mining face and movement features of a rock stratum.
The daily output of the waste rocks produced by mining the rock protection layer is obtained through the following formula:
M2 = PV2 L2 H yr!
(1) in the formula:
SECTION LENGTH DETERMINATION METHOD
Technical Field The present invention relates to the technical field of filling coal mining, and more particularly to a method for determining a length of a filling section of a fully mechanized coal mining-filling mixed mining working face.
Related Art In recent years, as a coal mine green mining technology for solving the "three-under"
(i.e. under buildings, railways and water) coal mining problems, the solid filling coal mining technology has already been widely popularized and used in multiple mine areas in China and has successively liberated a great number of coal resources; meanwhile, underground waste rocks are not raised out of the mine, so that the stack of the waste rocks on the ground .. is reduced, and the pollution-free and green concept is further reinforced;
and more and more mine areas employ an underground coal separation technology to realize a green circular mining integration technology of separating the underground waste rocks and backfilling a gob with the separated waste rocks. However, with the high-strength mining of the coal resources, a lot of coal mines encounter coal seams with low permeability and high gas burst risk during the subsequent extension mining of the coal seam; and the mining of said coal seam is dangerous, and the mining cost of the coal seams is high, which severely affects the service life of the coal mine. Therefore, a technology for mining an upper rock protection layer, pre-extracting gas of a protected coal seam, utilizing the waste rocks of the rock protection layer as a filling material to backfill the gob of a protected layer and achieving a purpose of not raising the waste rocks out of the mine and simultaneously extracting the coal and the gas has emerged at the right moment; and in this technology, in consideration of a coal mine yield and a gas drainage effect, the protected layer is mined by employing a fully mechanized coal mining-filling mixed working face.
Date Recue/Date Received 2022-05-13 The reasonable design of a length of a filling section of the fully mechanized coal mining-filling mixed mining working face has important effects on the timely treatment of the underground waste rocks, successful implementation of the filling coal mining, the gas drainage effect, and the like. Therefore, the research on a method for determining the length of the filling section of the fully mechanized coal mining-filling mixed mining working face becomes an indispensable research means and research method for the fully mechanized coal mining-filling mixed mining under similar conditions and has important practical significance and wide application prospect.
SUMMARY
In view of the problems in the prior art, the present invention is directed to a method for determining a length of a filling section of a fully mechanized coal mining-filling mixed mining working face, which is simple, safe, reliable and high in performance of engineering appliance.
The method for determining the length of the filling section of the fully mechanized coal mining-filling mixed mining working face includes; firstly, designing a total length of a mixed working face according to the production capacity requirement of a mine; secondly, primarily designing a range of the length of the filling section of the fully mechanized coal mining-filling mixed mining working face according to a principle that a daily output of the waste rocks of a rock protection layer working face is equal to a mass of a filling material for filling a gob of the filling section of the fully mechanized coal mining-filling mixed mining working face; and finally, determining the length of a filling section working face according to the requirements of the development of on-site cover rock cracks of the mixed mining face and movement features of a rock stratum.
The daily output of the waste rocks produced by mining the rock protection layer is obtained through the following formula:
M2 = PV2 L2 H yr!
(1) in the formula:
2 2 - daily output of waste rocks of the rock protection layer, 1/day;
du- underground separation rate of waste rocks, %;
V2 - daily advancing rate of the protection layer working face, in/day, determined by a cutting pick of a coal mining machine and coal cutting times;
L2 - length of a protection layer stope face, m, determined by a length of a gas drainage borehole;
HY^ height of a rock stratum of the protection layer stope face, m, determined by a development depth of the coal floor crack;
71- rock density, t/m3.
The quantity of the filling materials for filling the filling section of the fully mechanized coal mining-filling mixed mining working face is obtained through the following formula:
= v1L1,H17, (2) in the formula:
M1- daily consumption of the waste rocks of the fully mechanized coal mining-filling mixed mining working face, t/day;
vt- daily advancing rate of the fully mechanized coal mining-filling mixed mining working face, m/day, determined by an annual yield;
- length of the filling section of the fully mechanized coal mining-filling mixed mining working face, in, determined by the output of the waste rocks and the conveying capacity of a scraper blade;
- finable height, m, determined by a suspension height of a conveyor and advanced sinking amount of a roof; and
du- underground separation rate of waste rocks, %;
V2 - daily advancing rate of the protection layer working face, in/day, determined by a cutting pick of a coal mining machine and coal cutting times;
L2 - length of a protection layer stope face, m, determined by a length of a gas drainage borehole;
HY^ height of a rock stratum of the protection layer stope face, m, determined by a development depth of the coal floor crack;
71- rock density, t/m3.
The quantity of the filling materials for filling the filling section of the fully mechanized coal mining-filling mixed mining working face is obtained through the following formula:
= v1L1,H17, (2) in the formula:
M1- daily consumption of the waste rocks of the fully mechanized coal mining-filling mixed mining working face, t/day;
vt- daily advancing rate of the fully mechanized coal mining-filling mixed mining working face, m/day, determined by an annual yield;
- length of the filling section of the fully mechanized coal mining-filling mixed mining working face, in, determined by the output of the waste rocks and the conveying capacity of a scraper blade;
- finable height, m, determined by a suspension height of a conveyor and advanced sinking amount of a roof; and
3 apparent density of loose waste rocks, t/m3.
For the primarily designed range of the length of the filling section of the fully M
mechanized coal mining-filling mixed mining working face, according to MI 2 , by combining the formula (I) and (2), the range of the length Lla of the filling section of the fully mechanized coal mining-filling mixed mining working face is obtained as:
,tiv2L2H
vi tic (3).
The length of the filling section working face is determined according to the development of the on-site cover rock cracks of the working face and the movement features of the rock stratum.
The method has the beneficial effects: the length of the mining filling section of the fully mechanized coal mining-filling mixed mining working face is one of important parameters for analyzing and designing the fully mechanized coal mining-filling mixed mining technology. The method determines the total length of the fully mechanized coal mining-filling mixed mining working face, primarily determines the range of the length of the filling section working face according to a principle that a daily output of the waste rocks produced by mining the rock protection layer is equal to the mass of the filling material for filling the filling section of the fully mechanized coal mining-filling mixed mining working face and finally determines the length of the filling section working face according to the requirements of the development of on-site cover rock cracks of the fully mechanized coal mining-filling mixed mining working face and the movement features of the rock stratum. The method is simple and practical, can provide engineering technological guidance to the popularization and application of the fully mechanized coal mining-filling mixed mining technology, further promotes a "separation and backfilling"
integrated green mining circulating mode for avoiding raising the underground waste rocks of the coal mine out of the mine, backfilling the gob with the separated waste rocks and efficiently backfilling and mining the coal, and enlarges the popularization and application range of the filling coal mining technology. Since the length of the filling section of the fully
For the primarily designed range of the length of the filling section of the fully M
mechanized coal mining-filling mixed mining working face, according to MI 2 , by combining the formula (I) and (2), the range of the length Lla of the filling section of the fully mechanized coal mining-filling mixed mining working face is obtained as:
,tiv2L2H
vi tic (3).
The length of the filling section working face is determined according to the development of the on-site cover rock cracks of the working face and the movement features of the rock stratum.
The method has the beneficial effects: the length of the mining filling section of the fully mechanized coal mining-filling mixed mining working face is one of important parameters for analyzing and designing the fully mechanized coal mining-filling mixed mining technology. The method determines the total length of the fully mechanized coal mining-filling mixed mining working face, primarily determines the range of the length of the filling section working face according to a principle that a daily output of the waste rocks produced by mining the rock protection layer is equal to the mass of the filling material for filling the filling section of the fully mechanized coal mining-filling mixed mining working face and finally determines the length of the filling section working face according to the requirements of the development of on-site cover rock cracks of the fully mechanized coal mining-filling mixed mining working face and the movement features of the rock stratum. The method is simple and practical, can provide engineering technological guidance to the popularization and application of the fully mechanized coal mining-filling mixed mining technology, further promotes a "separation and backfilling"
integrated green mining circulating mode for avoiding raising the underground waste rocks of the coal mine out of the mine, backfilling the gob with the separated waste rocks and efficiently backfilling and mining the coal, and enlarges the popularization and application range of the filling coal mining technology. Since the length of the filling section of the fully
4
5 mechanized coal mining-filling mixed mining working face can be reasonably and accurately designed, a theoretical determination method can be provided for the length of the filling section of the fully mechanized coal mining-filling mixed mining working face under similar conditions. The method is simple and easy, good in test effect and high in engineering practicability and application value.
According to an aspect of the invention, there is provided a method for determining a length of a filling section of a fully mechanized coal mining-filling mixed mining working face and forming the filling section of the determined length, said method comprising:
firstly, designing a total length of a fully mechanized coal mining-filling mixed working face according to the .. production capacity requirement of a mine; secondly, determining a range of a length of a filling section of the fully mechanized coal mining-filling mixed mining working face according to a daily output of waste rocks of a rock protection layer working face being equal to the mass of filling materials for filling a gob of the filling section of the fully mechanized coal mining-filling mixed mining working face; and determining the length of the filling section working face according to a length of a rock protection layer stope face and a height of a rock stratum of the rock protection layer stope face and then forming a filling section for the fully mechanized coal mining-filling working face that is of the determined length, wherein the daily output of the waste rocks mined from a rock protection layer is obtained through the following formula:
M2 = ,uv2L2H
(1) in the formula:
M2 - daily output of waste rocks of the rock protection layer, t/day;
underground separation rate of waste rocks, %;
112- daily advancing rate of the rock protection layer working face, m/day, determined by a cutting pick of a coal mining machine and coal cutting times;
Date Recue/Date Received 2021-10-08 5a L2 - length of the rock protection layer stope face, m, determined by a length of a gas drainage borehole;
H , - height of the rock stratum of the rock protection layer stope face, m, determined by a development depth of the coal floor crack; and 71- rock density, t/m3.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a design flow chart illustrating a method for determining a length of a filling section of a fully mechanized coal mining-filling mixed mining working face.
Fig. 2 is a layout plan illustrating the fully mechanized coal mining-filling mixed mining working face.
Fig. 3 is a schematic diagram illustrating coal mining of a protection layer working face and the fully mechanized coal mining-filling mixed mining working face.
In the drawings: 1-self-propelled reversed loader; 2-filling belt-type conveyor; 3-scraper conveyor; 4-bottom-unloading conveyor; 5-unloading hole; 6-filling hydraulic support; 7-coal mining machine; 8-waste rock conveying roadway; 9-coal conveying roadway; L1-length of filling section working face; L2-length of falling section working face; L-total length of fully mechanized coal mining-filling mixed working face; 10-rock protection layer working face;
11-fully mechanized coal mining-filling mixed mining working face.
=
Date Recue/Date Received 2021-10-08 5b DETAILED DESCRIPTION
The present invention is further described below in combination with embodiments in the drawings:
As shown in Fig. 1 and Fig. 3, a method for determining a length Li of a filling section of a fully mechanized coal mining-filling mixed mining working face 11 includes:
firstly, coal mining parameters of a mine are determined according to a mining geological condition, and a total length L of the fully mechanized coal mining-filling mixed mining working face 11 is designed according to the production capacity of the mine; secondly, a range of the length Li of the filling length of the fully mechanized coal mining-filling Date Recue/Date Received 2021-10-08 mixed mining working face 11 is primarily determined according to a daily output of waste rocks of a rock protection layer working face 10 and daily consumption of the waste rocks of the filling section of the fully mechanized coal mining-filling mixed mining working face 11, and according to a principle that the filling materials for the protection layer working face and the fully mechanized coal mining-filling mixed mining working face are identical in mass; and finally, the length LI of the filling section of the fully mechanized coal mining-filling mixed mining working face 11 is determined according to a development height of the on-site cover rock cracks of the fully mechanized coal mining-filling mixed mining working face 11 and a gas drainage effect. The specific steps are as follows:
I. The total length L of the fully mechanized coal mining-filling mixed mining working face II is designed according to the production capacity requirement of the mine.
2. The daily output of the waste rocks of the rock protection layer working face 10 is calculated through the following formula:
m, pv2L2Hti (1) in the formula:
M2 - daily output of waste rocks of the rock protection layer, t/day;
P - underground separation rate of waste rocks, %;
V2 daily advancing rate of the protection layer working face, m/day, determined by a cutting pick of a coal mining machine and coal cutting times;
L2 " length of a protection layer stope face, m, determined by a length of a gas drainage borehole;
H "' height of a rock stratum of the protection layer stope face, m, determined by a development depth of the coal floor crack; and 71- rock density, t/m3.
According to an aspect of the invention, there is provided a method for determining a length of a filling section of a fully mechanized coal mining-filling mixed mining working face and forming the filling section of the determined length, said method comprising:
firstly, designing a total length of a fully mechanized coal mining-filling mixed working face according to the .. production capacity requirement of a mine; secondly, determining a range of a length of a filling section of the fully mechanized coal mining-filling mixed mining working face according to a daily output of waste rocks of a rock protection layer working face being equal to the mass of filling materials for filling a gob of the filling section of the fully mechanized coal mining-filling mixed mining working face; and determining the length of the filling section working face according to a length of a rock protection layer stope face and a height of a rock stratum of the rock protection layer stope face and then forming a filling section for the fully mechanized coal mining-filling working face that is of the determined length, wherein the daily output of the waste rocks mined from a rock protection layer is obtained through the following formula:
M2 = ,uv2L2H
(1) in the formula:
M2 - daily output of waste rocks of the rock protection layer, t/day;
underground separation rate of waste rocks, %;
112- daily advancing rate of the rock protection layer working face, m/day, determined by a cutting pick of a coal mining machine and coal cutting times;
Date Recue/Date Received 2021-10-08 5a L2 - length of the rock protection layer stope face, m, determined by a length of a gas drainage borehole;
H , - height of the rock stratum of the rock protection layer stope face, m, determined by a development depth of the coal floor crack; and 71- rock density, t/m3.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a design flow chart illustrating a method for determining a length of a filling section of a fully mechanized coal mining-filling mixed mining working face.
Fig. 2 is a layout plan illustrating the fully mechanized coal mining-filling mixed mining working face.
Fig. 3 is a schematic diagram illustrating coal mining of a protection layer working face and the fully mechanized coal mining-filling mixed mining working face.
In the drawings: 1-self-propelled reversed loader; 2-filling belt-type conveyor; 3-scraper conveyor; 4-bottom-unloading conveyor; 5-unloading hole; 6-filling hydraulic support; 7-coal mining machine; 8-waste rock conveying roadway; 9-coal conveying roadway; L1-length of filling section working face; L2-length of falling section working face; L-total length of fully mechanized coal mining-filling mixed working face; 10-rock protection layer working face;
11-fully mechanized coal mining-filling mixed mining working face.
=
Date Recue/Date Received 2021-10-08 5b DETAILED DESCRIPTION
The present invention is further described below in combination with embodiments in the drawings:
As shown in Fig. 1 and Fig. 3, a method for determining a length Li of a filling section of a fully mechanized coal mining-filling mixed mining working face 11 includes:
firstly, coal mining parameters of a mine are determined according to a mining geological condition, and a total length L of the fully mechanized coal mining-filling mixed mining working face 11 is designed according to the production capacity of the mine; secondly, a range of the length Li of the filling length of the fully mechanized coal mining-filling Date Recue/Date Received 2021-10-08 mixed mining working face 11 is primarily determined according to a daily output of waste rocks of a rock protection layer working face 10 and daily consumption of the waste rocks of the filling section of the fully mechanized coal mining-filling mixed mining working face 11, and according to a principle that the filling materials for the protection layer working face and the fully mechanized coal mining-filling mixed mining working face are identical in mass; and finally, the length LI of the filling section of the fully mechanized coal mining-filling mixed mining working face 11 is determined according to a development height of the on-site cover rock cracks of the fully mechanized coal mining-filling mixed mining working face 11 and a gas drainage effect. The specific steps are as follows:
I. The total length L of the fully mechanized coal mining-filling mixed mining working face II is designed according to the production capacity requirement of the mine.
2. The daily output of the waste rocks of the rock protection layer working face 10 is calculated through the following formula:
m, pv2L2Hti (1) in the formula:
M2 - daily output of waste rocks of the rock protection layer, t/day;
P - underground separation rate of waste rocks, %;
V2 daily advancing rate of the protection layer working face, m/day, determined by a cutting pick of a coal mining machine and coal cutting times;
L2 " length of a protection layer stope face, m, determined by a length of a gas drainage borehole;
H "' height of a rock stratum of the protection layer stope face, m, determined by a development depth of the coal floor crack; and 71- rock density, t/m3.
6 3. The quantity of the filling materials for filling the length A of the filling section of the fully mechanized coal mining-filling mixed mining working face 11 is calculated through the following formula:
Mi = v1LH1,7,c (2) in the formula:
Mi - daily consumption of the waste rocks of the fully mechanized coal mining-filling mixed mining working face, t/day;
v - daily advancing rate of the fully mechanized coal mining-filling mixed mining working face, m/day, determined by an annual yield;
- length of the filling section of the fully mechanized coal mining-filling mixed mining working face, m, determined by the output of the waste rocks and the conveying capacity of a scraper blade;
Hirt - tillable height, m, determined by a suspension height of a conveyor and advanced sinking amount of a roof; and 77. - apparent density of loose waste rocks, t/m3.
4. According to the principle of mass conservation, and the relation between the filling amount of the fully mechanized coal mining-filling mixed mining working face 11 and the output M1 M2 of the waste rocks of the rock protection layer working face 10, the length of the fully mechanized coal mining-filling mixed mining working face 11 is calculated, and according to the formula (I) and (2), the range of the length A of the filling section of the fully mechanized coal mining-filling mixed mining working face ills:
a iiv2L-211,77 (3);
5. The appropriate length LI of the filling section working face is determined
Mi = v1LH1,7,c (2) in the formula:
Mi - daily consumption of the waste rocks of the fully mechanized coal mining-filling mixed mining working face, t/day;
v - daily advancing rate of the fully mechanized coal mining-filling mixed mining working face, m/day, determined by an annual yield;
- length of the filling section of the fully mechanized coal mining-filling mixed mining working face, m, determined by the output of the waste rocks and the conveying capacity of a scraper blade;
Hirt - tillable height, m, determined by a suspension height of a conveyor and advanced sinking amount of a roof; and 77. - apparent density of loose waste rocks, t/m3.
4. According to the principle of mass conservation, and the relation between the filling amount of the fully mechanized coal mining-filling mixed mining working face 11 and the output M1 M2 of the waste rocks of the rock protection layer working face 10, the length of the fully mechanized coal mining-filling mixed mining working face 11 is calculated, and according to the formula (I) and (2), the range of the length A of the filling section of the fully mechanized coal mining-filling mixed mining working face ills:
a iiv2L-211,77 (3);
5. The appropriate length LI of the filling section working face is determined
7 according to the requirements on the development of the on-site cover rock cracks of the fully mechanized coal mining-filling mixed mining working face 11 and the gas extraction effect.
Embodiment 1: a JI15 coal seam of a mine is a coal seam with low permeability and high gas, a thickness of the coal seam is 3.2m, an average thickness of a JI14 coal seam of an upper protection coal seam is 0.5m, a distance from the .1114 coal seam to the 1115 coal seam is 13.5m, the length of the protection layer working face of the mine is designed at 150m, a mining height is 1.9m, 1.4m of rock stratum is mined, the gas of the protected layer coal seam is pre-extracted, and the waste rocks is backfilled to a gob of the filling section of a protected layer. The protected layer working face has a length of 218m, and is mined by employing a fully mechanized coal mining-filling mixed working face.
The design steps of the length of a filling section mined by the fully mechanized coal mining-filling mixed working face are as follows:
I. A calculation formula for a daily output of the waste rocks of the JI14-working face:
M, = pv,L,H
(1) in the formula:
2 - daily output of waste rocks of JI14-31010 working face, t/day;
11- underground separation rate of waste rocks, 65% to 100%;
v2- daily advancing rate, 2.4m/day;
L2 - length of the working face, 150m;
HY - height of a rock stratum, lAm;
77- rock density, 2.4t/m3.
2. Calculation formula for minimum consumption of the waste rocks of the 1115-working face:
Embodiment 1: a JI15 coal seam of a mine is a coal seam with low permeability and high gas, a thickness of the coal seam is 3.2m, an average thickness of a JI14 coal seam of an upper protection coal seam is 0.5m, a distance from the .1114 coal seam to the 1115 coal seam is 13.5m, the length of the protection layer working face of the mine is designed at 150m, a mining height is 1.9m, 1.4m of rock stratum is mined, the gas of the protected layer coal seam is pre-extracted, and the waste rocks is backfilled to a gob of the filling section of a protected layer. The protected layer working face has a length of 218m, and is mined by employing a fully mechanized coal mining-filling mixed working face.
The design steps of the length of a filling section mined by the fully mechanized coal mining-filling mixed working face are as follows:
I. A calculation formula for a daily output of the waste rocks of the JI14-working face:
M, = pv,L,H
(1) in the formula:
2 - daily output of waste rocks of JI14-31010 working face, t/day;
11- underground separation rate of waste rocks, 65% to 100%;
v2- daily advancing rate, 2.4m/day;
L2 - length of the working face, 150m;
HY - height of a rock stratum, lAm;
77- rock density, 2.4t/m3.
2. Calculation formula for minimum consumption of the waste rocks of the 1115-working face:
8 Htri, (2) in the formula:
- daily consumption of the waste rocks of the JI15-31010 working face, t/day;
daily advancing rate of the JI15-31010 working face, 2.4m/day;
- length of a working face filling section, m;
Hi- tillable height, 2.3m;
- apparent density of loose waste rocks, 1.85t/m3.
According to the design requirement, the daily consumption of the waste rocks of the 1115-31010 working face is greater than the daily output of the waste rocks of the JI14-31010 working face, i.e. Mt M.
;
H, By combining the formulas (1) and (2), an expression of the length of the filling section of the JI15-31010 working face:
yv2 11,17 vi tic (3) The separation rate of the waste rocks is calculated at 90% and substituted in the above formula to obtain that the minimum length of the filling section of the fully mechanized coal mining-filling mixed mining working face is 106m; and in consideration of the on-site application situation of a porous bottom-unloading conveyor and the development height of the on-site cover rock crack and the gas drainage effect, after the length of the filling section is greater than 124m, the development degree of the cover rock crack do not facilitate the gas extraction, finally the length LI of the filling section working face is determined as 120m, the length of the traditional fully mechanized coal mining section working face is 98m, and the total length of the fully mechanized coal mining-filling mixed mining working face is 218m.
- daily consumption of the waste rocks of the JI15-31010 working face, t/day;
daily advancing rate of the JI15-31010 working face, 2.4m/day;
- length of a working face filling section, m;
Hi- tillable height, 2.3m;
- apparent density of loose waste rocks, 1.85t/m3.
According to the design requirement, the daily consumption of the waste rocks of the 1115-31010 working face is greater than the daily output of the waste rocks of the JI14-31010 working face, i.e. Mt M.
;
H, By combining the formulas (1) and (2), an expression of the length of the filling section of the JI15-31010 working face:
yv2 11,17 vi tic (3) The separation rate of the waste rocks is calculated at 90% and substituted in the above formula to obtain that the minimum length of the filling section of the fully mechanized coal mining-filling mixed mining working face is 106m; and in consideration of the on-site application situation of a porous bottom-unloading conveyor and the development height of the on-site cover rock crack and the gas drainage effect, after the length of the filling section is greater than 124m, the development degree of the cover rock crack do not facilitate the gas extraction, finally the length LI of the filling section working face is determined as 120m, the length of the traditional fully mechanized coal mining section working face is 98m, and the total length of the fully mechanized coal mining-filling mixed mining working face is 218m.
9
Claims (3)
1. A method for determining a length of a filling section of a fully mechanized coal mining-filling mixed mining working face and then forming the filling section of the determined length, said method comprising: firstly, designing a total length of a fully mechanized coal mining-filling mixed working face according to the production capacity requirement of a mine; secondly, determining a range of a length of the filling section of the fully mechanized coal mining-filling mixed mining working face according to a daily output of waste rocks of a rock protection layer working face being equal to the mass of filling materials for filling a gob of the filling section of the fully mechanized coal mining-filling mixed mining working face; and determining the length of the filling section working face according to a length of a rock protection layer stope face and a height of a rock stratum of the rock protection layer stope face and then forming the filling section for the fully mechanized coal mining-filling working face that is of the determined length, wherein the daily output of the waste rocks mined from a rock protection layer is obtained through the following formula:
M2 =11v2L211,71 ( I) in the formula:
M2 - daily output of waste rocks of the rock protection layer, t/day;
underground separation rate of waste rocks, %;
v2 - daily advancing rate of the rock protection layer working face, m/day, determined by a cutting pick of a coal mining machine and coal cutting times;
L2 - length of the rock protection layer stope face, m, determined by a length of a gas drainage borehole;
H - height of the rock stratum of the rock protection layer stope face, m, determined by a development depth of the coal floor crack; and 71- rock density, t/m3.
M2 =11v2L211,71 ( I) in the formula:
M2 - daily output of waste rocks of the rock protection layer, t/day;
underground separation rate of waste rocks, %;
v2 - daily advancing rate of the rock protection layer working face, m/day, determined by a cutting pick of a coal mining machine and coal cutting times;
L2 - length of the rock protection layer stope face, m, determined by a length of a gas drainage borehole;
H - height of the rock stratum of the rock protection layer stope face, m, determined by a development depth of the coal floor crack; and 71- rock density, t/m3.
2. The method for determining the length of the filling section of the fully mechanized coal mining-filling mixed mining working face according to claim 1, wherein a quantity of filling materials for filling the filling section of the fully mechanized coal mining-filling mixed working face is obtained through the following formula:
MI = (2) in the formula:
1 - daily consumption of the waste rocks of the fully mechanized coal mining-filling mixed mining working face, t/day;
VI - daily advancing rate of the fully mechanized coal mining-filling mixed mining working face, m/day, determined by an annual yield;
- length of the filling section of the fully mechanized coal mining-filling mixed mining working face, m, determined by the output of the waste rocks and the conveying capacity of a scraper blade;
Hla - fillable height, m, determined by a suspension height of a conveyor and advanced sinking amount of a roof; and 71, - apparent density of loose waste rocks, t/m3.
MI = (2) in the formula:
1 - daily consumption of the waste rocks of the fully mechanized coal mining-filling mixed mining working face, t/day;
VI - daily advancing rate of the fully mechanized coal mining-filling mixed mining working face, m/day, determined by an annual yield;
- length of the filling section of the fully mechanized coal mining-filling mixed mining working face, m, determined by the output of the waste rocks and the conveying capacity of a scraper blade;
Hla - fillable height, m, determined by a suspension height of a conveyor and advanced sinking amount of a roof; and 71, - apparent density of loose waste rocks, t/m3.
3. The method for determining the length of the filling section of the fully mechanized coal mining-filling mixed mining working face according to claim 1 , wherein the designed range of the length 41 of the filling section of the fully mechanized coal mining-filling mixed mining working face, is obtained as:
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| CN201510925707.8A CN105464700B (en) | 2015-12-14 | 2015-12-14 | Fully mechanized mining filling mixed mining working face filling segment length determines method |
| PCT/CN2016/106335 WO2017101634A1 (en) | 2015-12-14 | 2016-11-18 | Fully mechanized mining-filling mixed mining working face filling section length determination method |
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| CN105912810B (en) * | 2016-04-29 | 2019-02-19 | 中国矿业大学 | A kind of filling with fully mechanized mining is mixed adopts face transition bracket supporting parameter design method |
| CN106761754A (en) * | 2017-03-31 | 2017-05-31 | 中国矿业大学 | A kind of girdle comprehensive mining and gas control network one cooperative control system and method |
| CN109057797A (en) * | 2018-09-30 | 2018-12-21 | 中国矿业大学 | A kind of mine, which picks up to fill, takes out mining Design method |
| CN109488301A (en) * | 2018-09-30 | 2019-03-19 | 中国矿业大学 | A kind of mine, which picks up, fills place's recovery method |
| CN109209380B (en) * | 2018-09-30 | 2020-10-30 | 中国矿业大学 | Design method for mining, selecting, filling and controlling |
| CN110145363B (en) * | 2019-04-30 | 2024-03-29 | 中国矿业大学(北京) | Roof control method for realizing transition from fully mechanized mining face caving to filling mining |
| CN110924944B (en) * | 2019-11-29 | 2020-09-22 | 北京科技大学 | Coal mine main roadway down-pressing coal segmented circulating filling mining method |
| CN113128044B (en) * | 2021-04-15 | 2022-04-12 | 辽宁工程技术大学 | Method for determining advancing mining step pitch of lateral mining working wall of soft rock opencast coal mine |
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| US5782539A (en) * | 1995-11-16 | 1998-07-21 | Peterson; Randall D. | Wall-to-wall surface mining process |
| RU2323339C2 (en) * | 2006-05-16 | 2008-04-27 | Станислав Александрович Кариман | Face equipment assembly |
| CN1936271B (en) * | 2006-08-21 | 2011-06-29 | 山东盛泉矿业有限公司 | Method for filling coal-steam-free extraction working surface goaf by coal mine waste rock |
| CN1963149B (en) * | 2006-11-17 | 2011-09-14 | 中国矿业大学 | Mining method for replacement of banded coal under building by waste rock |
| CN101586460B (en) * | 2009-06-02 | 2011-03-30 | 中国矿业大学 | Coal mining solid filling method |
| CN102865099B (en) * | 2012-08-29 | 2014-12-24 | 山西晋煤集团金鼎煤机矿业有限责任公司 | Under-building, under-railway and under-water mining filling process |
| CN102996131B (en) * | 2012-12-10 | 2014-10-29 | 中国矿业大学 | Solid-filling coal mining method with two pre-excavating tunnels for advancing |
| CN103670507B (en) * | 2013-02-04 | 2015-10-21 | 中国矿业大学 | A kind of defining method of high-dipping fully-mechanized mining working Gob Filling with Waste bandwidth |
| RU2553699C2 (en) * | 2013-10-23 | 2015-06-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Сибирский государственный индустриальный университет" | Method of methane capture during mining of coal layers by powered mining complex |
| CN103742148B (en) * | 2014-01-14 | 2016-08-17 | 山东科技大学 | The soft coal-mining method covering the descending waste filling of supporting of a kind of half-edge coal seam |
| CN104405437B (en) * | 2014-10-08 | 2016-05-18 | 中国矿业大学 | A kind of solid filling with combine the hybrid working face mining method of adopting |
| CN104775819B (en) * | 2015-03-27 | 2017-01-18 | 中国矿业大学 | Deep inclined coal seam mining roadway mine pressure control mining method |
| CN104963687B (en) * | 2015-07-09 | 2017-02-22 | 太原理工大学 | Method for recycling upper part residual coal and backfilling goaf by utilizing full-mechanized caving mining in extremely thick coal seam |
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| CN105134215A (en) * | 2015-09-25 | 2015-12-09 | 西安科技大学 | Local filling mining method for longwall face along strike of steeply dipping seam |
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