CN103670413A - Method for slowing longwall mining pressure appearance of shallow coal seam below gully - Google Patents
Method for slowing longwall mining pressure appearance of shallow coal seam below gully Download PDFInfo
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- CN103670413A CN103670413A CN201210378536.8A CN201210378536A CN103670413A CN 103670413 A CN103670413 A CN 103670413A CN 201210378536 A CN201210378536 A CN 201210378536A CN 103670413 A CN103670413 A CN 103670413A
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Abstract
The invention belongs to the field of mineral engineering, and in particular relates to a method for slowing the longwall mining pressure appearance of a shallow coal seam below a gully. In order to solve the problem of longwall mining pressure appearance abnormality of the shallow coal seam below the gully, the invention proposes that the development situation of a ground surface gully needs to be taken into consideration as an important influence factor when shallow coal seam longwall mining is performed in a gully development area. According to a propagation angle and an overburden rock breaking angle, the mining influence area of the gully is divided into an influence-free area, an influence area and a strong influence area; the determination of the position of a stop line of gully-avoiding mining and the arrangement of a working surface of gully-along mining are based on the following principles: during the gully-avoiding mining, the position of the stop line is positioned out of the strong influence area; during the gully-along mining, the boundary position, close to one side of the gully, of the working surface is in the area where the overburden rock height is more than the fissure area height. The method involves few calculation parameters, facilitates field implementation, has high safety, and can be widely applied to large-scale safe mining of the shallow coal seam below the gully.
Description
Technical field
The invention belongs to Mineral Engineering field, be specifically related to slow down shallow buried coal seam broadwall ore deposit under coombe and press the method manifesting.
Background technology
Along with the continuous enforcement of China's development of the West Regions state basic policy, the developing focus of coal resources in China has started to shift to western part.Compare with southwestern coalfield, coalfield, northwest surface vegetation is sparse, water and soil conservation ability is weak, earth's surface water erosion serious, coombe in length and breadth, slope body occurrence changes greatly, landform is incoherent, relative relief has more than 100 meters, mostly is coombe development area.The adverse effect that surface relief produces seam mining is confirmed by increasing theoretical research and engineering practice.For example, in old mine coal column removal process, repeatedly there is the unexpected unstable phenomenon of irregular coal column in the safe group of Inner Mongol gouy, causes large area roof fall; In the progradation of new mine coal wall, stope can be pressed suddenly, and intensity surpasses old top first weighting, then advances after certain distance, returns to normal again, and theoretical unaccountable phenomenon is pressed in these conventional ore deposits, all relevant with Coal Face Passing Through earth's surface coombe.Under coombe during shallow buried coal seam broadwall, for a series of ore deposits such as hydraulic support pushed down, coal wall caving are serious, press and manifest abnormal phenomenon, there is the problem of poor stability, high cost in existing technical measures, has a strong impact on the safety in production of mine.
Summary of the invention
In order to solve shallow buried coal seam broadwall ore deposit pressure under coombe, manifest abnormal problem, the present invention proposes and slow down the method that under coombe, shallow buried coal seam broadwall ore deposit pressure manifests, the method is convenient to practical operation, can be widely used in the extensive safe working of coal resources under coombe.
For achieving the above object, the present invention adopts following technical scheme: while carrying out shallow buried coal seam broadwall in coombe development area, earth's surface coombe developmental state is considered as an important factor in order.According to mining effect angle and the disrumpent feelings angle of overlying strata, coombe is divided into without influence area, influence area and strong effect district the influence area of exploitation.When exploiting deployment, for reducing or avoiding the body activity of coombe slope on the impact of exploiting, by changing work plane the position of terminal mining line and adjusting advance of the face direction, avoid coombe exploitation (keeping away ditch exploitation) or move towards exploitation (along ditch exploitation) along coombe.Keep away the determining with arrange along ditch exploitation work plane should be according to following principle of ditch exploitation the position of terminal mining line: while keeping away ditch exploitation, work plane the position of terminal mining line should be positioned at outside coombe strong effect district; While exploiting along ditch, the boundary position of nearly ditch one side of work plane should be within overlying strata height be greater than the region of fissure zone height.
The present invention slows down the beneficial effect of pressure process for show in shallow buried coal seam broadwall ore deposit under coombe:
(1) can effectively slow down under coombe shallow buried coal seam broadwall ore deposit and press and manifest the impacts such as the hydraulic support pushed down, the coal wall caving that extremely cause be serious, ensure the safe working of mine;
(2) make up the deficiency of shallow buried coal seam broadwall method under current coombe;
(3) the method applicability is strong, easy to implement, can improve to greatest extent the rate of recovery of coal resources.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiments of the present invention are further described:
Accompanying drawing is the schematic diagram that the present invention slows down pressure process for show in shallow buried coal seam broadwall ore deposit under coombe.
In figure: 1-keeps away ditch exploitation work plane and stops adopting position, and 2-exploits nearly ditch side work plane boundary position along ditch, top, 3-coombe slope, the line of demarcation in 4-influence area and strong effect district, I-is without influence area, II-influence area, III-strong effect district, δ-mining effect angle,
-overlying strata are disrumpent feelings angle, the fissure zone height of h-position 2 correspondences, the overlying strata height of H-position 2 correspondences.
The specific embodiment
When exploiting deployment, for reducing or avoiding the impact of coombe slope body activity on exploitation, by changing work plane the position of terminal mining line and adjusting advance of the face direction, realization keeps away ditch and exploits or exploit along ditch.
With reference to accompanying drawing, keep away ditch when exploitation, according to mining effect angle (δ), overlying strata are disrumpent feelings angle
coombe is divided into without influence area (I), influence area (II) and strong effect district (III) the influence area of exploitation.Mining effect angle (δ) and the disrumpent feelings angle of overlying strata
can consult and obtain by the field data in each mining area.When top, coombe slope (3) is subject to mining influence, the line of demarcation of work plane Ji Wu influence area, residing position (I) and influence area (II); By top, coombe slope (3), do the disrumpent feelings angle of overlying strata
, corresponding position (4) is the line of demarcation of influence area (II) and strong effect district (III).Work plane the position of terminal mining line (1) should be positioned at outside coombe strong effect district (III).While exploiting along ditch, the boundary position (2) of nearly ditch one side of work plane should be within overlying strata height (H) be greater than the region of fissure zone height (h).Overlying strata height (H) can obtain by consulting the borehole data in mining area.The feature that while considering shallow buried coal seam broadwall under the body of coombe slope, fissure zone is grown, in conjunction with UDEC numerical result, laboratory results of Physical and coombe, grow the field measurement data (10～14 times that fissure zone height is mining height) of mining area shallow buried coal seam broadwall, the design formulas of fissure zone height (h): h=10.9M+10.62 while obtaining shallow buried coal seam broadwall under the body of coombe slope.
In formula: h-fissure zone height, m.
M-mining height, m.
Claims (3)
1. the present invention slows down the method that under coombe, shallow buried coal seam broadwall ore deposit pressure manifests, it is characterized in that: when exploiting deployment, for reducing or avoiding the impact of coombe on exploitation, by changing work plane the position of terminal mining line and adjusting advance of the face direction, realize and keep away ditch exploitation or exploit along ditch.
2. according to claim 1ly slow down shallow buried coal seam broadwall ore deposit under coombe and press the method manifesting, it is characterized in that: while keeping away ditch exploitation, according to mining effect angle (δ), overlying strata are disrumpent feelings angle
coombe is divided into without influence area (I), influence area (II) and strong effect district (III) the influence area of exploitation.Work plane the position of terminal mining line (1) should be positioned at outside coombe strong effect district (III).
3. according to claim 1ly slow down shallow buried coal seam broadwall ore deposit under coombe and press the method manifesting, it is characterized in that: while exploiting along ditch, the boundary position (2) of nearly ditch one side of work plane should be within overlying strata height (H) be greater than the region of fissure zone height (h).
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| CN201210378536.8A CN103670413B (en) | 2012-09-21 | 2012-09-21 | Under slowing down coombe, the method manifested is pressed in shallow buried coal seam broadwall ore deposit |
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| CN201210378536.8A CN103670413B (en) | 2012-09-21 | 2012-09-21 | Under slowing down coombe, the method manifested is pressed in shallow buried coal seam broadwall ore deposit |
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| CN103670413A true CN103670413A (en) | 2014-03-26 |
| CN103670413B CN103670413B (en) | 2016-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115860314A (en) * | 2023-02-14 | 2023-03-28 | 北京科技大学 | Method and system for preventing and treating coal seam working surface impact danger based on surface gully |
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| US4887935A (en) * | 1987-12-23 | 1989-12-19 | Bochumer Eisenhutte Heintzmann Gmbh & Co. Kg | Method of controlling the movement of a longwall excavation front, especially the face or breast of a coal seam |
| RU2341657C1 (en) * | 2007-06-15 | 2008-12-20 | Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт имени Г.В. Плеханова (технический университет)" | Method of prevention of development entries in coal bed areas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115860314A (en) * | 2023-02-14 | 2023-03-28 | 北京科技大学 | Method and system for preventing and treating coal seam working surface impact danger based on surface gully |
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