AU2017410433A1 - Water disaster prevention and treatment design method for mine taking coal bed as main aquifer - Google Patents
Water disaster prevention and treatment design method for mine taking coal bed as main aquifer Download PDFInfo
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- AU2017410433A1 AU2017410433A1 AU2017410433A AU2017410433A AU2017410433A1 AU 2017410433 A1 AU2017410433 A1 AU 2017410433A1 AU 2017410433 A AU2017410433 A AU 2017410433A AU 2017410433 A AU2017410433 A AU 2017410433A AU 2017410433 A1 AU2017410433 A1 AU 2017410433A1
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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
- E21F16/00—Drainage
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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
- E21F11/00—Rescue devices or other safety devices, e.g. safety chambers or escape ways
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
A water disaster prevention and treatment design method for a mine taking a coal bed as a main aquifer. By determining the water discharge amount of a working face water discharging system, whether working face partial syncline exists, and whether a working face roof scouring zone and adjacent gobs exist, check computation and guarantee of the water discharge capacity of the working face are conducted and gob hydrops are discharged in advance. The method is applicable to underground coal mines, and is able to propose a specific water prevention and treatment measure according to information acquisition results of multiple objects and on the basis of a corresponding determination standard, provide early warning for multiple water-inrush types, reduce the loss caused by mine water disaster hazardous events, and even reduce casualties caused by the mine water disaster hazardous events.
Description
Water Disaster Prevention and Treatment Design Method for Mine Taking Coal Bed as Main Aquifer
Technical Field
The present invention relates to a water disaster prevention and control design method for a coal mine, particularly to a water disaster prevention and control design method for a mine where the coal seam is a main aquifer, which is applicable to be used for preventing downhole water disasters in a coal mine.
Background Art
The water inrush problem in coal mines is always a major technical problem restricting the safe production incoal mines in China. In order to solve that problem, water inrush prevention methods such as setting up waterproof coal rock pillars, dewatering and depressurization, and grouting transformation of rock formation have been developed in China and foreign countries. A hydrogeological characteristic of coal seam as a main aquifer is discovered for the first time in coal mines. There is no clear report on technology for water disaster prevention and control in such mines in China or foreign countries.
Contents of the Invention
Technical problem: with respect to the drawbacks in the prior art, the purpose of the present invention is to provide a water disaster prevention and control design method for a coal mine where the coal seam is a main aquifer, which consists of simple steps, can make judgment accurately and effectively reduce water disasters in the mines.
In view of the problems related with safe mining and water inrush prevention and control caused by a special hydrogeology that the coal seam is a main aquifer, the present invention provides a water disaster prevention and control design method for a mine where the coal seam is a main aquifer.
Technical Scheme: the water disaster prevention and control design method for mining at a mining face in a mine where the coal seam is a main aquifer in the present invention, comprising the following steps:
a. acquiring basic information on the mining face, including information on the drainage system at the mining face, information on local syncline at the mining face, erosion zone state of roof at the mining face and information on adjacent goaf;
b. making judgment on the drainage capacity of the mining face drainage system at the mining face periodically to obtain information on the drainage capacity and state of the drainage system, making judgment on the information of local syncline at the mining face to obtain information on the local syncline position and predicted uncovering length at the mining face, making i
judgment on the information of erosion zone of roof at the mining face to obtain information on the syncline position and predicted uncovering length, and making judgment on the information of adjacent goaf to obtain information on the water accumulation condition in the goaf;
c. carrying out calculation for the comprehensive information obtained in the preceding step, including the state of working condition of the drainage system, information on local syncline position and predicted uncovering length at the mining face, information on syncline position and predicted uncovering length, and information on water accumulation condition in the goaf, to obtain the drainage capacity at the current mining face;
d. utilizing conventional water prevention and control techniques to carry out advance dewatering of the accumulated water in the goaf for water prevention and control, according to the calculated drainage capacity at the current mining face.
The judgment criterion for the drainage capacity of the mining face drainage system is 100 to 150 m3/h; if the detected drainage capacity of the current mining face drainage system is lower than that value, the required drainage capacity at the current mining face has to be calculated, and the drainage equipment has to be replaced; if the drainage capacity of the mining face drainage system is higher than that value, it is required to further check whether the mining face drainage system operates normally.
The judgment criterion for judging whether the mining face drainage system operates normally is whether there is any failure in the mining face drainage system; if there is no failure in the drainage system, normal construction can be carried out at the mining face; if there is any failure in the drainage system, an early warning is conducted, and relevant work for ensuring the drainage capacity at the mining face is carried out.
Whether there is any local syncline at the mining face is judged; if there is no local syncline at the mining face, normal construction can be carried out at the mining face; if there is any local syncline at the mining face, it is required to further determine the local syncline position at the mining face and whether the predicted uncovering length is greater than or smaller than a judgment criterion value.
The judgment criterion value for the syncline position and predicted uncovering length is 50 to 100 meters; if the predicted uncovering length of the syncline is smaller than that value, normal construction can be carried out at the mining face; if the predicted uncovering length of the syncline is greater than that value, an early warning is provided, check calculation of the drainage capacity at the mining face and security work are carried out.
Whether there is any roof erosion zone is ascertained by field survey; if there is no roof erosion zone, normal construction can be carried out at the mining face; if there is any roof erosion zone, it is required to further determine the position of the roof erosion zone and whether the predicted uncovering length is greater than or smaller than a criterion value.
The judgment criterion for the position of the roof erosion zone and predicted uncovering length is 50 to 100 meters; if the predicted uncovering length of the roof erosion zone is smaller than that value, normal construction can be carried out at the mining face; if the predicted uncovering length of the roof erosion zone is greater than that value, an early warning is conducted, check calculation of the drainage capacity at the mining face and security work are carried out.
Whether there is any adjacent goaf is investigated; if there is no adjacent goaf, normal construction can be carried out at the mining face; if there is any adjacent goaf, it is required to further determine the water accumulation condition in the adjacent goaf.
The water accumulation condition in the adjacent goaf is judged and whether water accumulation exists in the adjacent goaf is investigated; if there is no water accumulation in the adjacent goaf, normal construction can be carried out at the mining face; if there is any water accumulation in the adjacent goaf, it is required to further investigate the position and volume of the accumulated water in the adjacent goaf and the advance dewatering situation.
Whether advance dewatering has been carried out is judged according to a result of field survey; if advance dewatering has been carried out, normal construction can be carried out at the mining face; if no advance dewatering has been carried out, an early warning is provided, and advance dewatering work and inspection and acceptance work are carried out.
Beneficial effects: the present invention utilizes multi-interdisciplinary to make a breakthrough in the prior art and thereby solves the problems of water disaster prevention and control in a mine where the coal seam is a main aquifer. The method provided in the present invention can provide early warnings against different forms of water inrush, can reduce losses resulted from dangerous events such as water disasters in a mine, even can reduce personnel casualties resulted from dangerous events such as water disasters in a mine, and fills up a gap in the water disaster prevention and control design method under a special geologic condition that the coal seam is a main aquifer; in the present invention, detailed information of the mining face is acquired, and a judgment module judges and selects water prevention and control measures,thus an early warning system and corresponding countermeasures are provided for tunneling and mining directly in an aqueous coal seam, and thereby safe tunneling and mining is guaranteed. The method provided in the present invention is an effective measure for water disaster prevention and control for a coal seam that is a main aquifer, the method is simple and linear, employs a reasonably designed scheme, and has low implementation cost and high practical operability.
Brief Description of Drawings
Fig. 1 is a flow chart of the water disaster prevention and control design method for a mine where the coal seam is a main aquifer according to the present invention.
Embodiments
Hereunder the present invention will be further detailed in an embodiment with reference to the accompanying drawings.
As shown in Fig. 1, the water disaster prevention and control design method for mining at a mining face in a mine where the coal seam is a main aquifer in the present invention, comprising the following steps:
a. acquiring basic information on the mining face, including information on the drainage system at the mining face, information on local syncline at the mining face, information on erosion zone state of roof and adjacent goaf at the mining face;
b. making judgment on the drainage capacity of the mining face drainage system at the mining face periodically, wherein the judgment criterion for the drainage capacity of the mining face drainage system is 100 to 150 m3/h; if the detected drainage capacity of the current mining face drainage system is lower than that value, it is required to calculate the required drainage capacity at the current mining face and the drainage equipment has to be replaced; if the drainage capacity of the mining face drainage system is higher than that value, it is required to further check whether the mining face drainage system operates normally, and determine whether there is any failure in the mining face drainage system; if there is no failure in the drainage system, normal construction can be carried out at the mining face; if there is any failure in the drainage system, an early warning is conducted, and relevant work for ensuring the drainage capacity at the mining face is carried out, thus, the drainage capacity and state of the drainage system are obtained;
making judgment on the information of local syncline at the mining face to obtain information on the local syncline position and predicted uncovering length at the mining face and judge whether there is any local syncline at the mining face, if there is no local syncline at the mining face, normal construction can be carried out at the mining face; if there is any local syncline at the mining face, it is required to further determine the local syncline position and whether the predicted uncovering length at the mining face is greater than or smaller than a judgment criterion value, and determine the syncline position and the relationship between the predicted uncovering length and the judgment criterion value of 50-100m, if the predicted uncovering length of the syncline is smaller than that value, normal construction can be carried out at the mining face; if the predicted uncovering length of the syncline is greater than that value, an early warning is provided, and check calculation of the drainage capacity at the mining face and security work are carried out;
making judgment on roof erosion zone information at the mining face to obtain information on the syncline position and predicted uncovering length, wherein whether there is any roof erosion zone is ascertained by field survey; if there is no roof erosion zone, normal construction can be carried out at the mining face; if there is any roof erosion zone, it is required to further determine position of the roof erosion zone and whether the predicted uncovering length is greater than or smaller than the judgment criterion value of 50 to 100 meters; if the predicted uncovering length of the roof erosion zone is smaller than that value, normal construction can be carried out at the mining face; if the predicted uncovering length of the roof erosion zone is greater than that value, an early warning is conducted, check calculation of the drainage capacity at the mining face and security work are carried out;
making judgment on adjacent goaf information and investigating whether there is any adjacent goaf, if there is no adjacent goaf, normal construction can be carried out at the mining face; if there is any adjacent goaf, it is required to further determine the water accumulation condition in the adjacent goaf and investigate whether there is water accumulation in the adjacent goaf, if there is no water accumulation in the adjacent goaf, normal construction can be carried out at the mining face; if there is any water accumulation in the adjacent goaf, it is required to further investigate the position and volume of the accumulated water and the advance dewatering situation in the adjacent goaf; whether advance dewatering has been carried out is judged according to a result of field survey, if advance dewatering has been carried out, normal construction can be carried out at the mining face; if no advance dewatering has been carried out, an early warning is provided, and advance dewatering work and inspection and acceptance work are carried out;
c. carrying out check calculation for the comprehensive information obtained in the preceding steps, including the state of working condition of the drainage system, information on local syncline position and predicted uncovering length at the mining face, information on syncline position and predicted uncovering length, and information on water accumulation condition in the goaf, to obtain the drainage capacity at the current mining face;
d. utilizing conventional water prevention and control techniques to carry out advance dewatering of the accumulated water in the goaf for water prevention and control, according to the calculated drainage capacity at the current mining face.
Embodiment 1:
Taking the downhole tunneling and mining of a coal seam containing water in a coal mine as an example, the downhole tunneling and mining work is carried out in a main coal seam 2#, which is a main aquifer, at a burial depth of 350 m. There are many major water disasters and threats at the mining face, mainly including a local syncline zone and an erosion zone in Zhiluo formation, water in coal seam 2#, and water in roof. Under the combined action of various water sources, the volume of water inrush at the tunneling and mining face will be increased to 110 to 160 m3/h. If the drainage capacity at the mining face is insufficient or the drainage equipment fails, local water accumulation may occur and even the equipment may be flooded; furthermore, owing to a fact that a slow rise mining method is mainly used at the mining face of the coal mine, the tunneling and mining work at the mining face adjacent to the goaf at the west side is inevitably confronted with the threat of water accumulation in the goaf. If the accumulated water in the goaf is not drained off timely or the sealing of the connection roadway fails, an accident of goaf water inrush into the mining face may occur. In view of such a situation, detailed information of the mining face is acquired, and a judgment module is utilized to choose corresponding water prevention and control measures, through the following steps specifically:
a. the basic information of the tunnelling face 11213 is acquired, the acquired objects includes the tunnelling face drainage system, local syncline at the tunnelling face, and roof erosion zone and adjacent goaf at the tunnelling face;
b. the basic information of the tunnelling face 11213 is inputted into the judgment module, and water prevention and control measures for the tunnelling face are selected according to specific judgment criteria;
c. the judgment criterion forjudging the drainage capacity of the drainage system in the judgment module is 100 to 150 m3/h; if the drainage capacity of the drainage system at the tunnelling face
11213 is lower than that value, check calculation of the drainage capacity has to be carried out; if the drainage capacity of the drainage system at the tunnelling face 11213 is higher than that value, it is required to further check the operating state of the tunnelling face drainage system;
d. the judgment criterion for judging the operating state of the tunnelling face drainage system is whether the drainage system operates normally; if the drainage system at the tunnelling face 11213 operates normally, normal construction can be carried out at the tunnelling face; if the drainage system at the tunnelling face 11213 doesn't operate normally, an early warning is provided, and relevant work for ensuring the drainage capacity at the tunnelling face is carried out;
e. the judgment criterion for judging any local syncline at the tunnelling face in the judgment module is whether there is any local syncline at the tunnelling face, if there is no local syncline at the tunnelling face 11213, normal construction can be carried out at the tunnelling face; if there is any local syncline at the tunnelling face 11213, it is required to further determine the local syncline position and the predicted uncovering length at the tunnelling face;
f. the judgment criterion for the syncline position and predicted uncovering length is 50 to 100 m; if the predicted uncovering length of the syncline at the tunnelling face 11213 is smaller than that value, normal construction can be carried out at the tunnelling face; if the predicted uncovering length of the syncline at the tunnelling face 11213 is greater than that value, an early warning is provided, check calculation of the drainage capacity at the tunnelling face and security work are carried out;
g. the judgment criterion forjudging roof erosion zone in the judgment module is whether there is any roof erosion zone; if there is no roof erosion zone at the tunnelling face 11213, normal construction can be carried out at the tunnelling face; if there is any roof erosion zone at the tunnelling face 11213, it is required to further determine the position of the roof erosion zone and the predicted uncovering length;
h. the judgment criterion for position of the roof erosion zone and predicted uncovering length is 50 to 100 m, if the predicted uncovering length of the roof erosion zone at the tunnelling face 11213 is smaller than that value, normal construction can be carried out at the tunnelling face; if the predicted uncovering length of the roof erosion zone at the tunnelling face 11213 is greater than that value, an early warning is provided, check calculation of the drainage capacity at the tunnelling face and security work are carried out;
i. the judgment criterion forjudging adjacent goaf is whether there is any adjacent goaf, if there is no adjacent goaf at the tunnelling face 11213, normal construction can be carried out at the tunnelling face; if there is any adjacent goaf at the tunnelling face 11213, it is required to further determine the water accumulation condition in the adjacent goaf;
j. the judgment criterion for judging the state of water accumulation in the adjacent goaf is whether there is water accumulation in the adjacent goaf, if there is no water accumulation in the adjacent goaf at the tunnelling face 11213, normal construction can be carried out at the tunnelling face; if there is any water accumulation in the adjacent goaf at the tunnelling face
11213, it is required to further investigate the position and volume of the accumulated water and the advance dewatering situation in the adjacent goaf;
k. the judgment criterion forjudging advance dewatering in the adjacent goaf is whether advance dewatering has been carried out, if advance dewatering has been carried out, normal construction can be carried out at the tunnelling face; if no advance dewatering has been carried out, an early warning is provided, and advance dewatering work and inspection and acceptance work are carried out.
Claims (10)
1. A water disaster prevention and control design method for mining at a mining face in a mine where the coal seam is a main aquifer, comprising the following steps:
a. acquiring basic information on the mining face, including information on the drainage system at the mining face, information on local syncline at the mining face, and information on erosion zone state of roof at the mining face and adjacent goaf;
b. making judgment on the drainage capacity of the mining face drainage system at the mining face periodically to obtain information on the drainage capacity and state of the drainage system, making judgment on the information of local syncline at the mining face to obtain information on the local syncline position and predicted uncovering length at the mining face, making judgment on the information of roof erosion zone at the mining face to obtain information on the syncline position and predicted uncovering length, and making judgment on the information of adjacent goaf to obtain information on the water accumulation condition in the goaf;
c. carrying out check calculation for the comprehensive information obtained in the preceding steps, including state of working condition of the drainage system, information on local syncline position and predicted uncovering length at the mining face, information on syncline position and predicted uncovering length, and information on water accumulation condition in the goaf, to obtain the drainage capacity at the current mining face;
d. utilizing conventional water prevention and control techniques to carry out advance dewatering of the accumulated water in the goaf for water prevention and control, according to the calculated drainage capacity at the current mining face.
2. The water disaster prevention and control design method for a mine where the coal seam is a main aquifer according to claim 1, wherein: the judgment criterion for the drainage capacity of the mining face drainage system is 100 to 150 m3/h; if the detected drainage capacity of the drainage system at the current mining face is lower than that value, it is required to calculate the required drainage capacity at the current mining face, and the drainage equipment has to be replaced; if the drainage capacity of the drainage system at the mining face is higher than that value, it is required to further check whether the drainage system at the mining face operates normally.
3. The water disaster prevention and control design method for a mine where the coal seam is a main aquifer according to claim 2, wherein: the judgment criterion for judging the operating state of the drainage system at the mining face is whether there is any failure in the drainage system at the mining face; if there is no failure in the drainage system, normal construction can be carried out at the mining face; if there is any failure in the drainage system, an early warning is conducted, and relevant work for ensuring the drainage capacity at the mining face is carried out.
4. The water disaster prevention and control design method for a mine where the coal seam is a main aquifer according to claim 1, wherein: whether there is any local syncline at the mining face is judged; if there is no local syncline at the mining face, normal construction can be carried out at the mining face; if there is any local syncline at the mining face, it is required to further determine the local syncline position at the mining face and whether the predicted uncovering length is greater than or smaller than a judgment criterion value.
5. The water disaster prevention and control design method for a mine where the coal seam is a main aquifer according to claim 4, wherein: the judgment criterion value for the syncline position and predicted uncovering length is 50 to 100 m, if the predicted uncovering length of the syncline is smaller than that value, normal construction can be carried out at the mining face; if the predicted uncovering length of the syncline is greater than that value, an early warning is provided, check calculation of the drainage capacity at the mining face and security work are carried out.
6. The water disaster prevention and control design method for a mine where the coal seam is a main aquifer according to claim 1, wherein: whether there is any roof erosion zone is ascertained by field survey, if there is no roof erosion zone, normal construction can be carried out at the mining face; if there is any roof erosion zone, it is required to further determine position of the roof erosion zone and whether the predicted uncovering length is greater than or smaller than a judgment criterion value.
7. The water disaster prevention and control design method for a mine where the coal seam is a main aquifer according to claim 6, wherein: the judgment criterion for position of the roof erosion zone and predicted uncovering length is 50 to 100 m, if the predicted uncovering length of the roof erosion zone is smaller than that value, normal construction can be carried out at the mining face; if the predicted uncovering length of the roof erosion zone is greater than that value, an early warning is conducted, check calculation of the drainage capacity at the mining face and security work are carried out.
8. The water disaster prevention and control design method for a mine where the coal seam is a main aquifer according to claim 1, wherein: whether there is any adjacent goaf is investigated, if there is no adjacent goaf, normal construction can be carried out at the mining face; if there is any adjacent goaf, it is required to further determine the water accumulation condition in the adjacent goaf.
9. The water disaster prevention and control design method for a mine where the coal seam is a main aquifer according to claim 8, wherein: the water accumulation condition in the adjacent goaf is judged and whether water accumulation exists in the adjacent goaf is investigated, if there is no water accumulation in the adjacent goaf, normal construction can be carried out at the mining face; if there is any water accumulation in the adjacent goaf, it is required to further investigate the position and volume of the accumulated water and the advance dewatering situation in the adjacent goaf.
10. The water disaster prevention and control design method for a mine where the coal seam is a main aquifer according to claim 9, wherein: whether advance dewatering has been carried out is judged according to a result of field survey, if advance dewatering has been carried out, normal construction can be carried out at the mining face; if no advance dewatering has been carried out, an early warning is provided, and advance dewatering work and inspection and acceptance work are carried out.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710256250.5A CN106968707B (en) | 2017-04-19 | 2017-04-19 | Design method for preventing and controlling water damage of mine with coal seam as main water-containing layer |
| CN201710256250.5 | 2017-04-19 | ||
| PCT/CN2017/087330 WO2018192067A1 (en) | 2017-04-19 | 2017-06-06 | Water disaster prevention and treatment design method for mine taking coal bed as main aquifer |
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| AU2017410433A1 true AU2017410433A1 (en) | 2019-11-28 |
| AU2017410433B2 AU2017410433B2 (en) | 2021-03-11 |
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| Country | Link |
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| CN (1) | CN106968707B (en) |
| AU (1) | AU2017410433B2 (en) |
| RU (1) | RU2729291C1 (en) |
| WO (1) | WO2018192067A1 (en) |
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| CN108468566B (en) * | 2018-03-26 | 2019-11-26 | 中煤科工集团西安研究院有限公司 | Empty crystal really visits and puts method mine based on underground pencil directional drilling always |
| CN110675273B (en) * | 2019-10-15 | 2022-08-12 | 神华神东煤炭集团有限责任公司 | Method for judging water and sand bursting disasters of coal face |
| CN111577382A (en) * | 2020-04-14 | 2020-08-25 | 河北昕佳工程勘查设计有限公司 | Water damage prevention and comprehensive water resource utilization method for karst big water iron mine in Hebei Handan chen region |
| CN114837739A (en) * | 2022-01-24 | 2022-08-02 | 中国矿业大学(北京) | Coal-water-heat collaborative co-mining and water disaster heat damage treatment system |
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| SU676737A1 (en) * | 1978-06-26 | 1979-07-30 | Всесоюзный научно-исследовательский институт горной геомеханики и маркшейдерского дела | Method of reducing inflow of water into mine workings |
| CN101008317A (en) * | 2006-01-27 | 2007-08-01 | 李维熙 | Coal mine safety disaster-resistant type automatic main drainage system |
| US8381726B2 (en) * | 2006-08-16 | 2013-02-26 | Rescue Air Systems, Inc. | Safety system and method of an underground mine |
| KR100883400B1 (en) * | 2008-06-05 | 2009-02-12 | 경인시설안전기술단(주) | Water leak detecting and safety diagnosis device for tunnel |
| US20090316530A1 (en) * | 2008-06-18 | 2009-12-24 | Jerry Bunyard | Bi-directional seismic communication system and method |
| KR20120089017A (en) * | 2011-02-01 | 2012-08-09 | 김태환 | Key stone monitoring system and tunnel construction method thereof |
| CN103742145B (en) * | 2013-12-24 | 2016-01-20 | 山东新阳能源有限公司 | Colliery rich water abnormal area water prevention method |
| CN103899356A (en) * | 2014-02-21 | 2014-07-02 | 北京华安奥特科技有限公司 | Integrated information system for monitoring, early warning, management and control of mine water disasters |
| CN105930634A (en) * | 2016-04-06 | 2016-09-07 | 中国神华能源股份有限公司 | Mine water disaster early warning method |
| CN106089296B (en) * | 2016-06-16 | 2018-09-18 | 陕西省煤田地质有限公司 | A kind of prevention and treatment method of roof absciss layer water |
| CN106246224A (en) * | 2016-08-11 | 2016-12-21 | 山东科技大学 | Mine water disaster at-once monitor early warning system |
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- 2017-04-19 CN CN201710256250.5A patent/CN106968707B/en active Active
- 2017-06-06 AU AU2017410433A patent/AU2017410433B2/en active Active
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| RU2729291C1 (en) | 2020-08-05 |
| WO2018192067A1 (en) | 2018-10-25 |
| CN106968707B (en) | 2020-01-21 |
| CN106968707A (en) | 2017-07-21 |
| AU2017410433B2 (en) | 2021-03-11 |
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