AU2013358812B2 - Solid-filling coal mining method with two pre-excavated tunnels for advancing - Google Patents

Solid-filling coal mining method with two pre-excavated tunnels for advancing Download PDF

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Publication number
AU2013358812B2
AU2013358812B2 AU2013358812A AU2013358812A AU2013358812B2 AU 2013358812 B2 AU2013358812 B2 AU 2013358812B2 AU 2013358812 A AU2013358812 A AU 2013358812A AU 2013358812 A AU2013358812 A AU 2013358812A AU 2013358812 B2 AU2013358812 B2 AU 2013358812B2
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Australia
Prior art keywords
filling
mining
pre
coal
excavated
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AU2013358812A1 (en
Inventor
Xuejie DENG
Haiqiang JIANG
He Wang
Jixiong ZHANG
Qiang Zhang
Nan ZHOU
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China University of Mining and Technology
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China University of Mining and Technology
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Priority to CN201210527033.2A priority patent/CN102996131B/en
Application filed by China University of Mining and Technology filed Critical China University of Mining and Technology
Priority to PCT/CN2013/088632 priority patent/WO2014090108A1/en
Publication of AU2013358812A1 publication Critical patent/AU2013358812A1/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/04Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
    • E21D23/0481Supports specially adapted for use in combination with the placing of filling-up materials

Abstract

A solid-filling coal mining method with two pre-excavated tunnels for advancing. A mining roadway adopts an arrangement mode that the pre-excavated tunnels are taken as air return and inlet roadways and a gob-side entry retaining roadway is taken as a roadway for transporting filling materials and coal; coal extraction and gob backfilling are carried out by a comprehensive mechanical solid-filling coal mining process; and a coal mining method that a mining sequence is propelled by making a filling coal mining working face be back to the direction of transporting the coal to a mountain in a mining area is used. The pre-excavated tunnels are formed, by tunneling, before the extraction of the working face, and the gob-side entry retaining roadway is formed by optimally designed filling bodies beside the roadway along with the implementation of advancing filling coal mining operation along the working face. The coal mining method is simple in process, technically and completely realizes coal milling without pillars, and achieves high coal resource extraction rate. The coal mining method can not only solve the technical problems that a draw-back-type down-mining and up-filling working face cannot ensure a filling effect during a filling milling process of a mine with shortage of resources, but also materialize the comprehensive mechanical solid-filling coal mining of mines with limited geological conditions by virtue of an advancing up-milling and down-filling working face.

Description

1 Solid-Filling Coal Mining Method with Two Pre-Excavated Tunnels for Advancing Field of the Invention The present invention relates to a solid-filling coal mining method with two pre-excavated tunnels for advancing, which is especially suitable for use at coal pillar 5 free gob-side entry retaining working faces in approximately horizontal medium thickness coal seams with comprehensive mechanized solid back-filling mining technique. Background of the Invention Comprehensive mechanized solid material back-filling mining technique is a 10 revolutionary back-filling mining technique. Since that technique is developed, it has been widely applied industrially at more than 20 working faces in over 10 mining areas in china, comprising Pingdingshan (beneath villages), Jining (beneath dense villages), Yanzhou (beneath large-size river banks), north of Anhui (beneath the fourth aquifer), Kailuan (beneath a railway network) etc, and the technique has outstanding advantages in 15 terms of improvement of recovery rate of coal resources, utilization of solid materials in coal mines and protection of buildings (constructions) in coal mines, and protection of land, waters, and ecological environment, etc., and has become the technique of first choice for exploiting coal resources beneath railroads, waters, and constructions and stagnant coal resources. Since the technique controls the movement of overlying rock 20 strata in the mining area by filling the mined-out space densely with solid materials and thereby controls the strata pressure behaviors and surface subsidence, the result of dense back-filling of the mined-out space is a key for successful implementation of the technique. However, the adaptability of the back-filling technique to the variation of coal seam inclination is limited, owing to the limitation of solid back-filling mining equipment 25 and filling technique, and an arrangement of upward mining and downward filling (uphill mining and downhill filling) has to be used as far as possible at the working face of solid back-filling mining, therefore, it may be a challenge to apply the back-filling technique 7079717_1 (GHMatters) P98338.AU DENISET 2 under specific geological conditions. Usually, the working face of comprehensive mechanized coal mining is arranged as a retreating way, and advances in the uphill transport (or uphill track) direction along the boundary of the section, but if the coal seam inclination varies severely in that direction, i.e., the mining/ back-filling working face has 5 to be in an arrangement of downward mining and upward filling (downhill mining and uphill filling), the application effect of the back-filling technique can't be ensured. Summary of the invention An embodiment of the present invention may provide a solid-filling coal mining method with two pre-excavated tunnels for advancing, which may be easy to operation and can 10 achieve a high recovery rate of coal resources, and may be easy to control the back-filling result. A first aspect of the invention provides a solid-filling coal mining method with two pre-excavated tunnels for advancing according, comprising the following steps: a. opening a cut from the uphill transport roadway, and tunneling in a coal body in a 15 direction from the uphill roadway to a boundary of the section to form a pre-excavated transport tunnel; b. opening a cut from the uphill track roadway, and tunneling in the coal body in a direction from the uphill roadway to the boundary of the section to form a pre-excavated track tunnel; 20 c. opening a cut from the pre-excavated transport tunnel or pre-excavated track tunnel to form a connecting tunnel, which connects the pre-excavated transport tunnel and the pre-excavated track tunnel; d. reserving protecting coal pillars, forming a cut hole at a boundary of the protection coal pillars, and deploying working face back-filling/mining equipment comprising coal 25 cutter, scraper conveyer, back-filling/mining hydraulic support, perforated bottom-dump 7079717_1 (GHMatters) P98338.AU DENISET 3 conveyer, and lifting platform in the cut hole; e. arranging a tunnel mining equipment comprising a crusher, a stage loader conveyer, and a transport belt conveyer in the pre-excavated transport tunnel; f arranging a tunnel filling equipment comprising a self-shift transfer conveyer and a s gangue transport belt conveyer in the pre-excavated track tunnel; g. advancing the back-filling/mining working face from the uphill roadway to the boundary of the section, and carrying out coal mining and filling operation in a pitch; h. constructing side filling constructions in the pre-excavated transport tunnel and pre-excavated track tunnel as the mining/ back-filling operation at the working face 10 proceeds, to accomplish the gob-side entry retaining work in a pitch; i. repeating the step g and h to carry out mining, filling, and gob-side entry retaining work gradually and cyclically in the next pitch, till the mining, filling, and gob-side entry retaining work for the working face is completed. An embodiment of the present invention may effectively solve a technical problem, i.e., 15 the back-filling effect cannot be ensured at downward mining/upward filling working faces in retreat arrangement in a back-filling mining process in coal mines in short of resources; with two-tunnel gob-side entry retaining technique, an embodiment of the present invention implements coal pillar-free mining and thereby improves the recovery rate of coal resources; with an advancing working face of upward mining and downward 20 filling arrangement, comprehensive mechanized solid back-filling mining is realized in coal mines where the mining work is restricted by geological conditions. In an embodiment of the present invention, since the mined-out space is filled with solid materials, the range of movement of the overlying rock strata in the mining area is effectively limited, the strata pressure behaviors and surface subsidence are effectively 25 controlled, and the safety of surface buildings/constructions is ensured. Thus, the method according to an embodiment of the present invention has unique technical advantages in 7079717_1 (GHMatters) P98338.AU DENISET 4 exploitation of the coal resources beneath railroads, waters, and constructions. Description of Drawings Embodiments of the invention will now be described by way of example only with reference to the accompanying non-limiting Figures, in which: 5 Fig.1 is a process-state diagram I of the method according to an embodiment of the present invention; Fig.2 is a process-state diagram II of the method according to t an embodiment of he present invention; Fig.3 is a layout diagram of a working face according to an embodiment of the present 10 invention. Among the figures: 1 - uphill transport roadway, 2 - uphill track roadway, 3 pre-excavated transport tunnel, 4 - pre-excavated track tunnel, 5 - reserved transport tunnel, 6 - reserved track tunnel, 7 - cut hole, 8 - protecting coal pillar, 9 - side filling construction, 10 - goaf filling construction, 11 - perforated bottom-dump conveyer, 12 15 transport belt conveyer, 13 - gangue transport belt conveyer, 14 - back-filling/mining hydraulic support, 15 - self-shift transfer conveyer, 16 - coal cutter, 17 - ramming mechanism, 18 - front scraper conveyer, 19 - discharge port, 20 - rear top beam of back-filling/mining hydraulic support, 21 - connecting tunnel, 22 - boundary of protecting coal pillars, 23 - lifting platform, 24 - crusher, 25 - stage loader conveyer 20 Embodiments Hereunder the present invention will be detailed in embodiments with reference to the accompanying drawings: The solid-filling coal mining method with two pre-excavated tunnels for advancing according to an embodiment of the present invention is as follows: first of all, opening a 25 cut from an uphill transport roadway 1, and tunneling in the coal body in a direction from 7079717_1 (GHMatters) P98338.AU DENISET 5 the uphill roadway to the boundary of the section to form a pre-excavated transport tunnel 3; opening a cut from an uphill track roadway 2, and tunneling in the coal body in a direction from the uphill roadway to the boundary of the section to form a pre-excavated track tunnel 4; stopping tunneling when the two pre-excavated tunnels are excavated to s the boundary of the section; then, opening a cut from the pre-excavated transport tunnel 3 or pre-excavated track tunnel 4 to form a connecting tunnel 21, which connects the pre-excavated transport tunnel 3 and the pre-excavated track tunnel 4; air is taken in from the pre-excavated transported tunnel 3 and returned from the pre-excavated track tunnel 4, so as to form an initial ventilation system; 10 Reserving a protecting coal pillars 8, opening a cut hole 7 at the boundary 22 of the protecting coal pillars to also connect the pre-excavated transport tunnel 3 and the pre-excavated track tunnel 4, to form a ventilation system of the back-filling/mining working face; and arranging a key working face back-filling/mining equipment comprising a coal cutter 16, a scraper conveyer 18, a back-filling/mining hydraulic 15 support 14, a perforated bottom-dump conveyer 11, and a lifting platform 23 in the cut hole 7; arranging a tunnel key mining equipment comprising a crusher 24, a stage loader conveyer 25, and a transport belt conveyer 12 in the pre-excavated transport tunnel 3; arranging a tunnel key filling equipment comprising a self-shift transfer conveyer 15 and a gangue transport belt conveyer 13 in the pre-excavated track tunnel 4; after the 20 equipment installation is completed, beginning to advance forward the back-filling/mining working face, and carrying out mining, filling, and gob-side entry retaining work gradually and cyclically, to accomplish an upward mining and downward filling process; The steps of gradual and cyclic coal mining, filling, and gob-side entry retaining work are 25 as follows: according to the normal cycle, first of all, beginning the coal cutter 16 and cut the coal seam with the normal footage (0.6m cutting depth), and then moving in turn the back-filling/mining hydraulic support 14, the scraper conveyer 18, and transport equipment in the reserved transport tunnel 5, to accomplish the mining procedures; 7079717_1 (GHMatters) P98338.AU DENISET 6 second, beginning in turn the perforated bottom-dump conveyer 11, self-shift transfer conveyer 15, gangue transport belt conveyer 13 that are suspended below the rear top beam 20 of the back-filling/mining hydraulic support and the transport equipment in the reserved track tunnel 6 to transport solid materials (gangue, fly ash, etc.); beginning the 5 ramming mechanism 17 on the back-filling/mining hydraulic support 14 to tamp the solid materials discharged from the discharge port 19 of the perforated bottom-dump conveyer, to accomplish the filling procedures for the goaf filling constructions 10; as the mining/ back-filling work at the working face proceeds, construct side filling constructions 9 by piling up gangue bags or placing concrete manually in the two tunnels, to form new 10 reserved transport tunnel 5 and reserved track tunnel 6 respectively, so as to accomplish the gob-side entry retaining procedures in the pitch; lastly, repeat the above mining, filling, and gob-side entry retaining procedures in turn in the next pitch, to accomplish cyclic mining, filling, and gob-side entry retaining work gradually and cyclically; carry out upward mining and downward filling at the back-filling/mining working face 15 continuously, till the working face advances to the boundary of the section, so as to accomplish the coal mining work in the section, then, continue to the next working face. It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country. 20 In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the 25 presence or addition of further features in various embodiments of the invention. 7079717_1 (GHMatters) P98338.AU DENISET

Claims (1)

1. A solid-filling coal mining method with two pre-excavated tunnels for advancing, comprising the following steps: a. opening a cut from an uphill transport roadway, and tunneling in a coal body in a 5 direction from the uphill roadway to a boundary of the section to form a pre-excavated transport tunnel; b. opening a cut from an uphill track roadway, and tunneling in the coal body in a direction from the uphill roadway to the boundary of the section to form a pre-excavated track tunnel; 10 c. opening a cut from the pre-excavated transport tunnel or pre-excavated track tunnel to form a connecting tunnel, which connects the pre-excavated transport tunnel and the pre-excavated track tunnel; d. reserving protecting coal pillars, opening a cut hole at a boundary of the protecting coal pillars, and arranging a working face back-filling/mining equipment comprising coal 15 cutter, a scraper conveyer, a back-filling/mining hydraulic support, a perforated bottom-dump conveyer, and a lifting platform in the cut hole; e. arranging a tunnel mining equipment comprising a crusher, a stage loader conveyer, and a transport belt conveyer in the pre-excavated transport tunnel; f. arranging a tunnel filling equipment comprising a self-shift transfer conveyer and a 20 gangue transport belt conveyer in the pre-excavated track tunnel; g. advancing the back-filling/mining working face from the uphill roadway to the boundary of the section, and carrying out coal mining and filling operation in a pitch; h. constructing side filling constructions in the pre-excavated transport tunnel and pre-excavated track tunnel as the mining/ back-filling operation at the working face 25 proceeds, to accomplish the gob-side entry retaining work in a pitch; 7079717_1 (GHMatters) P98338.AU DENISET 8 i. repeating the step g and h to carry out mining, filling, and gob-side entry retaining work gradually and cyclically in the next pitch, till the mining, filling, and gob-side entry retaining work for the working face is completed. 7079717_1 (GHMatters) P98338.AU DENISET
AU2013358812A 2012-12-10 2013-12-05 Solid-filling coal mining method with two pre-excavated tunnels for advancing Active AU2013358812B2 (en)

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CN201210527033.2 2012-12-10
CN201210527033.2A CN102996131B (en) 2012-12-10 2012-12-10 Solid-filling coal mining method with two pre-excavating tunnels for advancing
PCT/CN2013/088632 WO2014090108A1 (en) 2012-12-10 2013-12-05 Solid-filling coal mining method with two pre-excavated tunnels for advancing

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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
CN103362508B (en) * 2013-07-31 2015-04-15 六盘水师范学院 Mine development method
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CN102996131B (en) 2014-10-29
WO2014090108A1 (en) 2014-06-19
CN102996131A (en) 2013-03-27

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