AU2014393189B2 - Method for filling open stope with aeolian sand in shallow coal seam in western desertified mining areas - Google Patents
Method for filling open stope with aeolian sand in shallow coal seam in western desertified mining areas Download PDFInfo
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- AU2014393189B2 AU2014393189B2 AU2014393189A AU2014393189A AU2014393189B2 AU 2014393189 B2 AU2014393189 B2 AU 2014393189B2 AU 2014393189 A AU2014393189 A AU 2014393189A AU 2014393189 A AU2014393189 A AU 2014393189A AU 2014393189 B2 AU2014393189 B2 AU 2014393189B2
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- 239000004576 sand Substances 0.000 title claims abstract description 123
- 238000005065 mining Methods 0.000 title claims abstract description 85
- 239000003245 coal Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000000737 periodic effect Effects 0.000 claims abstract description 14
- 239000011435 rock Substances 0.000 claims abstract description 14
- 238000011105 stabilization Methods 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 11
- 238000007790 scraping Methods 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 13
- 239000010410 layer Substances 0.000 claims description 10
- 230000033001 locomotion Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 230000006378 damage Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 2
- 230000009545 invasion Effects 0.000 description 6
- 239000007787 solid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- E21F15/06—Filling-up mechanically
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
- Earth Drilling (AREA)
Abstract
Provided is a method for filling an open stope with aeolian sand in a shallow coal seam in western desertified mining areas, which is suitable for a coal mining face having a better roof self-stabilization and being capable of forming an open stope of a certain size in the rear portion. By using the features of a small amount of work involved in drilling from the earth surface to the shallow coal seam and a good self-flowing performance of aeolian sand, drilling arrangement is conducted above an open stope (9) formed after a coal mining face (8) is mined, and the open stope is directly filled with aeolian sand, and is filled in stages prior to underground periodic weighting such that filling the open stope with aeolian sand is achieved. Because the western coal seam is shallowly buried and has a thick overlying loose layer and a thin bedrock, the amount of work involved in drilling is small, the cost is low, and the construction cycle is short. Moreover, the problems of overlying rock destruction and earth surface subsidence can be effectively solved, and inrushes of water and sand are relieved, improving the environment of the western mining areas. A new technical approach is created for green mining in the western desertified mining areas of our country, and has a high production efficiency, less equipment investment and a low filling cost.
Description
1 2014393189 27 Jun2016
METHOD FOR FILLING OPEN STOPE WITH AEOLIAN SAND IN SHALLOW COAL SEAM IN WESTERN DESERTIFIED MINING AREAS
Field of the Invention
The present invention relates to a method for filling an open stope with aeolian sand in 5 shallow coal seam in western desertified mining areas, which is especially suitable for a coal mining face having a better roof self-stabilization and being capable of forming an open stope of a certain size in the rear portion.
Background of the Invention
Western desertified mining areas have geological structural features including shallowly 0 buried coal seam, big mining thickness, thin bedrock and thick aeolian sand loose layer, and have hydrogeological features including locally thick aquiclude in the aeolian sand loose layer, and under this situation, the mining work may not only lead to overlying rock destruction and earth surface subsidence but also result in severe disaster accidents such as water invasion or sand inrush. Engineering practice has demonstrated that the working face or 5 tunnel may be buried owing to water invasion or sand inrush. Hence, water invasion and sand inrush have become one of the major hidden troubles that endanger the safety of coal mine. Filling mining is the most intuitive and effective solution against overlying rock destruction, earth surface subsidence, water invasion, and sand inrush etc.
At present, filling mining techniques applied in coal mines in China and foreign countries are 0 mainly classified into three types by the filling material: solid filling technique (e.g., filling with gangue, fly ash, loess, etc.), paste or quasi-paste filling technique and high water or ultra-high water material filling technique. These three techniques have solved the above problem at different levels, wherein, the solid filling technique is widely applied, owing to its advantages such as high mechanization level and high recovery ratio, etc. However, at 5 present, for solid filling, drift sand wells are usually arranged in a surface plant, but some mining areas are far away from the surface plant; consequently, the underground material transport route is very long, the material transport capacity is inadequate, and the reliability of the material transport system is severely compromised; in addition, the limited down-hole space and transport capacity are occupied, thus the production efficiency is not high. 30 Moreover, a lot of equipments need to be invested and the cost is high. It is of great practical significance to develop an aeolian sand filling method in western desertified mining areas. Such method has wide application prospects.
Contents of the Invention
It would be advantageous to solve the problems existed in the current filling techniques, and 35 provide a method for filling an open stope with aeolian sand in shallow coal seam in western desertified mining areas, which utilizes aeolian sand filling to solve the problems such as overlying rock destruction, earth surface subsidence, water invasion and sand inrush, etc., and thereby improve production efficiency, reduce equipment invest and decrease filling cost.
The present invention provides a method for filling an open stope with aeolian sand in 40 shallow coal seam in western desertified mining areas, wherein, it comprises the following steps: 2 2014393189 27 Jun2016 a. determining technical parameters of a coal mining face and drift sand wells, according to coal seam occurrence characteristic and mining technical conditions; b. distributed fixed drilling: drilling a plurality of drift sand wells leading to the ground surface at an appropriate interval above the coal mining face and an open stope formed 5 after mining; c. transporting materials quantitatively from ground surface: arranging sand scraping winches around the drift sand well on the ground surface, transporting peripheral aeolian sand target into the drift sand well, controlling flow rate of aeolian sand, and ensuring stability and safety of the drift sand well and its surrounding; 0 d. cyclic operation at the working face: filling the open stope in stages prior to underground periodic weighting as the coal mining operation advances , so as to achieve filling the open stope with aeolian sand; if the gravitational flow property of aeolian sand is poor, a movable shuttle flattening system is arranged to assist the filling operation; the movable shuttle flattening system 5 comprises a sand scraping winch, scraper buckets, pulleys, and a pulley track; the scraper buckets are connected to the sand scraping winch and the pulleys through steel wire ropes respectively, the pulley track is deployed on the roof of a gob side entry at both sides of the coal mining face, a winch track is deployed on the floor of the gob side entry, and the sand scraping winch rides on the winch track; as the coal mining face advances, the 0 scraper buckets are controlled for reciprocating shuttle motion in open stope, so as to uniformly flatten the sand pile formed below the drift sand well by material feeding and fill open stope timely; after filling the open stope, the sand scraping winch is moved towards the coal mining face along the winch track, and the pulleys are moved towards the coal mining face along the pulley track simultaneously. 5 Optionally, drifting diameter of the drift sand well is not lower than equivalent diameter do when aeolian sand falls; here, the equivalent diameter d0 = 0.02y[~A , wherein, A is coal yield capacity, the drifting diameter is usually 200~400mm, and flow rate of aeolian sand is usually 0.04~0.20m3/s.
Optionally, the length of the coal mining face is subject to the limitation of rope capacity 30 of the underground sand scraping winch, and is usually not greater than 100m.
Optionally, if the width of the open stope along the strike is wide and the roof selfstabilization is poor, temporary support mean is utilized to increase the roof strength and to extend the time of self-stabilization.
Optionally, the spacing between drift sand wells is subject to limitation of rope capacity 35 of the underground sand scraping winch, and is usually not greater than 100m and not lower than 5~15m.
Optionally, the array pitch of drift sand wells is consistent with the self-stabilization span of open stope in the direction of advancement of the coal mining face and the periodic weighting step pitch of the mining face, and is usually not greater than 10~40m, so as to 40 reduce transporting distance of aeolian sand in the direction of advancement of the coal mining face as far as possible; wherein, the periodic weighting step pitch of the working 3 2014393189 27 Jun2016 face is determined according to a formula LIS = h^RT/(3q) , wherein, LIS is the periodic weighting step pitch of the main roof, RT is the tensile strength of the main roof rock layer, q is the load on the main roof rock beams, and h is the single layer thickness of main roof rock layer. 5 Beneficial effects: In embodiments of the present invention, in consideration of the low workload of drilling from the ground surface to the shallow coal seam and the good selfflowing property of surface aeolian sand, drift sand wells are arranged above an open stope formed after mining at a coal mining face, so as to directly fill the open stope with aeolian sand and to achieve filling. The method provided in the present invention opens 0 up a novel technical approach for green mining in western desertified mining areas, and has advantages of high production efficiency, low equipment investment and low filling cost. Specifically, the advantages include: 1. With aeolian sand filling method, the problem of overlying rock destruction and earth surface subsidence can be effectively solved, water invasion and sand inrush can be 5 alleviated, and the environment in western mining areas can be improved; 2. Because the western coal seam is shallowly buried and has a thick overlying loose layer and a thin bedrock, the amount of work involved in drilling is small, the cost is low, and the construction cycle is short; in addition, the material transport route is greatly shortened, the down-hole space is not occupied essentially, and the production efficiency 0 is greatly improved; 3. Since aeolian sand is widely distributed in western desertified mining areas, it is to obtain materials from local sources and the filling cost can be reduced; 4. The movable shuttle flattening system is simple and easy to operate; after aeolian sand is flattened, open stope can be filled or partially filled efficiently; the void percentage is 5 low, the compactness is high, and the filling result is good; 5. The method is especially suitable for coal mining faces which has good roof self-stabilization and in the rear portion of which an open stope of certain size can be formed; in case of poor roof self-stabilization, temporary support means can be utilized.
Description of the Drawings 30 Fig. lisa top view illustrating the method for filling an open stope with aeolian sand in shallow coal seam in western desertified mining areas provided in the present invention;
Fig. 2 is a sectional view illustrating the method for filling an open stope with aeolian sand in shallow coal seam in western desertified mining areas provided in the present invention;
Fig. 3 is a perspective view illustrating the method for filling an open stope with aeolian sand 35 in shallow coal seam in western desertified mining areas provided in the present invention.
Among the figures: 1 - drift sand well, 2 - sand scraping winch, 3 - scraper bucket, 4 - pulley, 5 - pulley track, 6 - winch track, 7 - gob side entry, 8 - coal mining face, 9 - open stope.
Detailed Description of the Embodiments
Hereunder embodiments of the present invention will be described in detail in embodiments 40 with reference to the accompanying drawings. 4 2014393189 27 Jun2016
The method for filling an open stope with aeolian sand in shallow coal seam in western desertified mining areas provided in the present invention comprises the following steps: a. determining technical parameters of a coal mining face 8 and drift sand wells 1, according to coal seam occurrence characteristic and mining technical conditions; 5 b. distributed fixed drilling: drilling a plurality of drift sand wells 1 leading to the ground surface at an appropriate interval above the coal mining face 8 and an open stope 9 formed after mining; c. transporting materials quantitatively from ground surface: arranging sand scraping winches around the drift sand well 1 on the ground surface, transporting peripheral 0 aeolian sand target into the drift sand well 1, controlling flow rate of aeolian sand, and ensuring stability and safety of the drift sand well 1 and its surrounding; d. cyclic operation at the working face: filling the open stope 9 in stages prior to underground periodic weighting as the coal mining operation advances , so as to achieve filling the open stope with aeolian sand. 5 If the gravitational flow property of aeolian sand is poor, a movable shuttle flattening system is arranged to assist the filling operation; the movable shuttle flattening system comprises a sand scraping winch 2, scraper buckets 3, pulleys 4, and a pulley track 5; the scraper buckets 3 are connected to the sand scraping winch 2 and the pulleys 4 through steel wire ropes respectively, the pulley track 5 is deployed on the roof of a gob side 0 entry 7 at both sides of the coal mining face 8, a winch track 6 is deployed on the floor of the gob side entry, and the sand scraping winch 2 rides on the winch track 6; as the coal mining face 8 advances, the scraper buckets 3 are subjected to reciprocating shuttle motion in open stope 9, so as to uniformly flatten the sand pile formed below the drift sand well 1 by material feeding and fill open stope 9 timely; after filling the open stope 9, 5 the sand scraping winch 2 is moved towards the coal mining face 8 along the winch track 6, and the pulleys 4 are moved towards the coal mining face 8 along the pulley track 5 simultaneously.
Drifting diameter of the drift sand well 1 is not lower than equivalent diameter do when aeolian sand falls; here, the equivalent diameter d0 = 0.02*Ja , wherein, A is coal yield 30 capacity, the drifting diameter is usually 200~400mm, and flow rate of aeolian sand is usually 0.04~0.20m3/s.
The length of the coal mining face 8 is subject to the limitation of rope capacity of the underground sand scraping winch, and is usually not greater than 100m.
If the width of the open stope 9 along the strike is wide and the roof self-stabilization is 35 poor, temporary support means is utilized to increase the roof strength and to extend the time of self-stabilization.
The spacing between drift sand wells 1 is subject to limitation of rope capacity of the underground sand scraping winch, and is usually not greater than 100m and not lower than 5~15m. 40 The array pitch of drift sand wells 1 is consistent with the self-stabilization span of open stope 9 in the direction of advancement of the coal mining face 8 and the periodic 5 2014393189 27 Jun2016 weighting step pitch of the mining face, and is usually not greater than 10~40m, so as to reduce transporting distance of aeolian sand in the direction of advancement of the coal mining face as far as possible; wherein, the periodic weighting step pitch of the working face is determined according to a formula LIS = h-^RT/(3q) , wherein, LIS is the periodic 5 weighting step pitch of the main roof, RT is the tensile strength of the main roof rock layer, q is the load on the main roof rock beams, and h is the single layer thickness of main roof rock layer.
Example 1 (1) For a mine in the western region of China, it has a burial depth of approximately 65m, 0 the thickness of aeolian sand loose layer is approximately 45m, the thickness of the bedrock is approximately 20m, and the volumetric weight of coal γ is 1.3t/m3. The design length L of the coal mining face 8 is 90m, and the mining height H is 5.2m. The roof of open stope has good self-stabilization. The average periodic weighting step pitch is 15m, the array pitch of drift sand wells is 15m. Arrange as Fig. 1. In addition, a movable shuttle flattening system mainly 5 utilizing a sand scraping winch is arranged. 0 30 (2) One sand scraping winch 2 is arranged in every gob side entry 7 at both sides of the coal mining face 8, the volume of scraper bucket 3 is Vo= 1.2m3, the number n of scraper buckets 3 is 2, the rope capacity of the winch is 100m, the average working speed Vt of the scraper bucket 3 is 1.2m/s, the flattening filling operation time per day is 0.5d, the mining operation time per day is 0.5d, and annual working days is 330d; thus, the daily flattening volume can be calculated with a formula = n x Fa/(I/Vt). The volume of the sand pile formed by feeding is V=ir χ Η x r2/ 3, wherein, r = Hx cet s, a is the natural accumulating angle of aeolian sand, here, a=32°. According to the isometric partial filling principle, assume the compaction rate β is 0.8, the theoretical coal yield capacity at the mining face is and the maximum advancing velocity is 1¾ = J/[336 xHxl X y].
The theoretical coal yield capacity at the mining face calculated with the data is A=832,000t/a, and the maximum advancing velocity is tT0=4m/d. The equivalent diameter do of falling aeolian sand is calculated with the formula d0 = 0. 02λ[α , and the result is tlo= 180mm, The flow rate Q of falling aeolian sand is calculated with the formula Q = va x L x h /*.:>20e resuit is (7=0.045m3/s. Thus, the diameter of the drift sand well can be 250m, and the flow rate is controlled at 0.04-0.05m3/s. (3) A pulley track 5 is deployed on the roof of the gob side entry 7 at both sides of the coal mining face 8, a winch track 6 is deployed on the floor of the gob side entry 7, and the sand scraping winch 2 rides on the winch 6; as the coal mining face 8 advances, the scraper 35 buckets 3 are subjected to reciprocating shuttle motion in open stope 9, so as to uniformly flatten the sand pile formed below the drift sand well 1 by feeding and fill open stope 9 timely; after filling the open stope 9, the sand scraping winch 2 is moved towards the coal mining face 8 along the winch track 6, and the pulleys 4 are moved towards the coal mining face 8 along the pulley track 5 simultaneously. 40
Claims (6)
- Claims1. A method for filling an open stope with aeolian sand in shallow coal seam in western desertified mining areas, wherein, it comprises the following steps: a. determining technical parameters of a coal mining face and drift sand wells, according to coal seam occurrence characteristic and mining technical conditions; b. distributed fixed drilling: drilling a plurality of drift sand wells leading to the ground surface at an appropriate interval above the coal mining face and an open stope formed after mining; c. transporting materials quantitatively from ground surface: arranging sand scraping winches around the drift sand well on the ground surface, transporting peripheral aeolian sand target into the drift sand well, controlling flow rate of aeolian sand, and ensuring stability and safety of the drift sand well and its surrounding; d. cyclic operation at the working face: filling the open stope in stages prior to underground periodic weighting as the coal mining operation advances , so as to achieve filling the open stope with aeolian sand; if the gravitational flow property of aeolian sand is poor, a movable shuttle flattening system is arranged to assist the filling operation; the movable shuttle flattening system comprises a sand scraping winch, scraper buckets, pulleys, and a pulley track; the scraper buckets are connected to the sand scraping winch and the pulleys through steel wire ropes respectively, the pulley track is deployed on the roof of a gob side entry at both sides of the coal mining face, a winch track is deployed on the floor of the gob side entry, and the sand scraping winch rides on the winch track; as the coal mining face advances, the scraper buckets are subjected to reciprocating shuttle motion in open stope, so as to uniformly flatten the sand pile formed below the drift sand well by material feeding and fill open stope timely; after filling the open stope, the sand scraping winch is moved towards the coal mining face along the winch track, and the pulleys are moved towards the coal mining face along the pulley track simultaneously.
- 2. The method for filling an open stope with aeolian sand in shallow coal seam in western desertified mining areas according to claim 1, wherein, drifting diameter of the drift sand well is not lower than equivalent diameter dO when aeolian sand falls; here, the equivalent diameter, wherein, A is coal yield capacity, the drifting diameter is usually 200~400mm, and flow rate of aeolian sand is usually 0.04-0.20m3/s.
- 3. The method for filling an open stope with aeolian sand in shallow coal seam in western desertified mining areas according to claim 1, wherein, the length of the coal mining face 8 is subject to limitation of the rope capacity of the underground sand scraping winch, and is usually not greater than 100m.
- 4. The method for filling an open stope with aeolian sand in shallow coal seam in western desertified mining areas according to claim 1, wherein, if the width of the open stope along the strike is wide and the roof self-stabilization is poor, temporary support means is utilized to increase the roof strength and to extend the time of self-stabilization.
- 5. The method for filling an open stope with aeolian sand in shallow coal seam in western desertified mining areas according to claim 1, wherein, the spacing between drift sand wells is subject to limitation of rope capacity of the underground sand scraping winch, and is usually not greater than 100m and not lower than 5~15m.
- 6. The method for filling an open stope with aeolian sand in shallow coal seam in western desertified mining areas according to claim 1, wherein, the array pitch of drift sand wells is consistent with the self-stabilization span of open stope in the direction of advancement of the coal mining face and the periodic weighting step pitch of the mining face, and is usually not greater than 10~40m, so as to reduce transporting distance of aeolian sand in the direction of advancement of the coal mining face as far as possible; wherein, the periodic weighting step pitch of the working face is determined according to a formulawherein, LIS is the periodic weighting step pitch of the main roof, RT is the tensile strength of the main roof rock layer, q is the load on the main roof rock beams, and h is the single layer thickness of main roof rock layer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410191662.1A CN103939137B (en) | 2014-05-07 | 2014-05-07 | The drift-sand barnyard placement method of western desertification mining area shallow buried coal seam |
| CN201410191662.1 | 2014-05-07 | ||
| PCT/CN2014/079202 WO2015168972A1 (en) | 2014-05-07 | 2014-06-05 | Method for filling open stope with aeolian sand in shallow coal seam in western desertified mining areas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2014393189A1 AU2014393189A1 (en) | 2016-07-14 |
| AU2014393189B2 true AU2014393189B2 (en) | 2016-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| AU2014393189A Ceased AU2014393189B2 (en) | 2014-05-07 | 2014-06-05 | Method for filling open stope with aeolian sand in shallow coal seam in western desertified mining areas |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN103939137B (en) |
| AU (1) | AU2014393189B2 (en) |
| RU (1) | RU2635927C1 (en) |
| WO (1) | WO2015168972A1 (en) |
| ZA (1) | ZA201603501B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104816B (en) * | 2017-11-27 | 2019-07-05 | 西北矿冶研究院 | Upward mining method of steeply inclined thin ore body |
| CN109268063B (en) * | 2018-10-24 | 2020-10-16 | 新疆大学 | Method for constructing gob-side entry retaining roadway protection wall by using aeolian sand filling net cage |
| CN109519218B (en) * | 2018-10-24 | 2020-10-16 | 新疆大学 | Method for filling goaf by utilizing aeolian sand dry-type filling net cage bearing body |
| CN109322669B (en) * | 2018-12-04 | 2021-02-02 | 新疆大学 | Method for alternately filling rigid and flexible strips in inclined coal seam goaf without coal pillars and continuously mining |
| CN110145308B (en) * | 2019-06-21 | 2021-03-30 | 山东威斯特矿山工程科技股份有限公司 | Three-down coal mining method for layered stepping mining and filling of concentrated filling roadway of near-horizontal extra-thick coal seam |
| CN110145360A (en) * | 2019-06-21 | 2019-08-20 | 山东威斯特矿山工程科技股份有限公司 | A kind of tunnel intelligence gangue filling machine and placement method |
| CN113187544B (en) * | 2021-05-28 | 2023-05-26 | 辽宁科技大学 | Large underground goaf treatment method of beam type roof structure |
| CN115163072B (en) * | 2022-07-14 | 2024-07-02 | 中冶长天国际工程有限责任公司 | Method for constructing key layer of mining of 'three-lower' ore body and application thereof |
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2014
- 2014-05-07 CN CN201410191662.1A patent/CN103939137B/en active Active
- 2014-06-05 AU AU2014393189A patent/AU2014393189B2/en not_active Ceased
- 2014-06-05 WO PCT/CN2014/079202 patent/WO2015168972A1/en active Application Filing
- 2014-06-05 RU RU2016120684A patent/RU2635927C1/en not_active IP Right Cessation
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2016
- 2016-05-23 ZA ZA2016/03501A patent/ZA201603501B/en unknown
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|---|---|---|---|---|
| US4340254A (en) * | 1979-02-14 | 1982-07-20 | Tatabanyai Szenbanyak | Method of mining heavy coal seams in two or more benches |
| CN101806059A (en) * | 2010-04-02 | 2010-08-18 | 中铁二局股份有限公司 | Drilling, grouting and sand-throwing process of ground surface of mined-out region under highway |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103939137A (en) | 2014-07-23 |
| ZA201603501B (en) | 2017-07-26 |
| RU2635927C1 (en) | 2017-11-17 |
| WO2015168972A1 (en) | 2015-11-12 |
| AU2014393189A1 (en) | 2016-07-14 |
| CN103939137B (en) | 2015-12-02 |
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