CN103061766B - Method for preventing and controlling coalbed rockburst through chemical reaction - Google Patents
Method for preventing and controlling coalbed rockburst through chemical reaction Download PDFInfo
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- CN103061766B CN103061766B CN201310010316.4A CN201310010316A CN103061766B CN 103061766 B CN103061766 B CN 103061766B CN 201310010316 A CN201310010316 A CN 201310010316A CN 103061766 B CN103061766 B CN 103061766B
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Abstract
The invention discloses a method for preventing and controlling coalbed rockburst through chemical reaction, which sequentially comprises the following steps: selecting a coalbed with rockburst disasters and a vitrinite reflectance of less than 0.6%; selecting a certain area in the coalbed to carry out hole drilling; blocking orifices of drilled holes; preparing an alkali solution; pumping the prepared alkali solution into the drilled holes to soak for a period of time; and monitoring in a slight shock, electromagnetic radiation or cuttings drilling mode so as to ensure that the outburst-proneness is eliminated, repeatedly carrying out soaking many times until the outburst-proneness is completely eliminated. Compared with the traditional physical rockburst prevention and control measures, and the traditional rockburst prevention and control measures, the method disclosed by the invention is not only good in rockburst prevention and control effect, but also convenient to construct, high in safety and low in cost, eliminates the outburst-proneness rapidly and thoroughly, avoids the defect that the traditional water injection and absorption speeds are slow, provides a new prevention and control method for low-rank coalbed rockburst, and has a broad application prospect in low-rank coalbeds.
Description
Technical field
The invention belongs to Safety of Coal Mine Production technical field, be specifically related to the method for a kind of chemical reaction control Bumping Pressure in Coal Layers.
Background technology
Along with the increase of mining depth, due to the acting in conjunction of geostatic stress, mining induced stress and tectonic stress, most of mine is subject to the threat of bump to some extent, the simultaneously Burst Tendency in coal seam itself, Mining technology condition and geologic(al) factor, manifesting of bump can be day by day serious, and pressure bump behavior is more and more frequent.Impact strength and destructiveness increasing, occur particularly frequent and strong when particularly mining depth reaches earth's surface 500 below m.
Bump serious threat Safety of Coal Mine Production, can cause digging space gross distortion destruction, personnel death and device damage, displacement etc.; Gas-bearing Coal Seams occurs coal seam or goaf gas also can be caused to pour out when impacting, and meets fire and easily causes gas explosion.Current China great majority are adopted dark larger colliery and have been occurred the dynamic phenomenons such as bump.
The method of current improvement bump mainly contains exploitation topping, coal-bed flooding, destressing borehole, roof break and relieving shot etc., and key reduces elasticity energy and the stress transfer peak value in coal seam, realizes weakening or shifting bump.Exploitation topping is difficult to carry out at single coal bed.At getting working face and tunnel control bump, coal-bed flooding and relieving shot are comparatively conventional, and the former limitation main manifestations is that the speed of the absorption water in coal seam is comparatively slow, and coal body elasticity can reduce insufficient; The latter easily brings out bump and coal and gas prominent, dangerous during miso-fire handling.
Summary of the invention
The present invention is for solving along with the colliery depth of excavation increases, rock blast hazard becomes increasingly conspicuous, current physics mode eliminates the limitation that bump exists, there is provided one to utilize aqueous slkali and low-order coal generation chemical reaction to reduce coal mechanics intensity and elasticity energy, eliminate the method for the chemical reaction control Bumping Pressure in Coal Layers of Bumping Pressure in Coal Layers.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: the method for chemical reaction control Bumping Pressure in Coal Layers, comprises the following steps successively:
(1), select to there is rock blast hazard and the coal seam of vitrinite reflectance < 0.6%;
(2), in coal seam, select certain area to hole, the quantity of boring, the degree of depth and direction meet even cloth hole requirement;
(3), by the port closing of boring;
(4), aqueous slkali is configured;
(5), the aqueous slkali infusion of configuration in boring, a period of time is soaked;
(6), adopt microseism, electromagnetic radiation or drilling cuttings mode to monitor, guarantee to eliminate Burst Tendency, repeat to soak repeatedly, until eliminate Burst Tendency completely;
(7), with conventional physical mode prevent and treat bump measure and compare, inspection chemical reaction mode prevents and treats the effect of bump.
[OH in described aqueous slkali
-] > 1 mol/L, aqueous slkali contacts with low order coal seam, namely chemical reaction occurs, and coal seam mechanical strength sharply reduces, and presents plasticity, loses Burst Tendency.
In described step (2), certain area refers to that digging produces stress and concentrates the position that maybe will produce stress and concentrate, or has the coal seam of Burst Tendency.
In described step (5), soak time is greater than 6 h, along with concentration and the soak time of corresponding raising aqueous slkali are improved in coal rank.
Compare content in described step (7) to comprise operating cost, eliminate the speed of Burst Tendency and construction fussy degree.
Adopt technique scheme, when aqueous slkali is injected into coal seam, due to the organic matter containing a large amount of similar humic acid in low-order coal, there is chemical reaction rapidly in both, organic matter is dissolved by extracting, and the mechanical strength of coal sharply reduces, and presents the coal grain even plastic state such as coal slime, elasticity can disappear substantially, loses Burst Tendency.How to reduce the mechanical strength of coal, brittle fracture is converted into plastic strain, the gathering eliminating elasticity energy is the key of Controlling of Coal Outburst, but the physical means such as the coal-bed flooding adopted at present, relieving shot and boring release can reduce the mechanical strength of coal, but reduction limitation, elasticity can also likely be assembled and discharge, and Burst Tendency of Coal Seam still exists.The present invention fully and fast can reduce the mechanical strength of coal, and coal body is completely in plasticity, and elasticity can lose the possibility of gathering, improves the prevention effect of Bumping Pressure in Coal Layers, reduces Safety of Coal Mine Production cost.
The present invention mainly for
r o, maxthe bump that the low order coal seam of < 0.6% exists is prevented and treated, not only overcome coal seam and absorb the slow feature of water speed, and in coal large amount of organic once contact with aqueous slkali and namely chemical reaction occur, the mechanical strength of coal sharply reduces, form class sapropelitic grain even coal slime, present plasticity completely, lose Burst Tendency.With conventional impact press compared with prophylactico-therapeutic measures, not only prevent and treat bump effective, and easy construction, safety are high, eliminate Burst Tendency speed fast and thorough, with low cost, avoid the drawback that traditional waterflood infiltration rate is slow, for low order Bumping Pressure in Coal Layers provides a kind of new prevention and controls, have broad application prospects in low order coal seam.
Detailed description of the invention
The method of chemical reaction control Bumping Pressure in Coal Layers of the present invention, comprises the following steps successively:
(1), select to there is rock blast hazard and the coal seam of vitrinite reflectance < 0.6%;
(2), in coal seam, select certain area to hole, the quantity of boring, the degree of depth and direction meet even cloth hole requirement; Described certain area refers to that digging produces stress and concentrates the position that maybe will produce stress and concentrate, or has the coal seam of Burst Tendency.
(3), by the port closing of boring;
(4), aqueous slkali is configured, [the OH in aqueous slkali
-] > 1 mol/L;
(5), the aqueous slkali infusion of configuration in boring, soak time is greater than 6 h, along with concentration and the soak time of corresponding raising aqueous slkali are improved in coal rank; In immersion process, aqueous slkali contacts with low order coal seam, namely chemical reaction occurs, and coal seam mechanical strength sharply reduces, and presents plasticity, loses Burst Tendency;
(6), adopt microseism, electromagnetic radiation or drilling cuttings mode to monitor, guarantee to eliminate Burst Tendency, repeat to soak repeatedly, until eliminate Burst Tendency completely;
(7), with conventional physical mode prevent and treat bump measure and compare, inspection chemical reaction mode prevents and treats the effect of bump; Relatively content comprises operating cost, eliminates the speed of Burst Tendency and construction fussy degree.
Enumerate a specific embodiment below:
(1), the brown coal mine having Burst Tendency is selected; (2), boring is evenly arranged at coal-face; (3) traditional coal seam water filling sealing of hole mode used, is adopted to carry out sealing of hole; (4), down-hole configuration [OH
-the NaOH solution of]=2 mol/L; (5), by pumping into device the aqueous slkali of configuration is poured into each boring, injection rate equals the water injection rate of traditional coal seam, after soak time is greater than 6 h; (6), adopt electromagnetic radiation to monitor, guarantee that coal seam loses Burst Tendency completely, otherwise should repeat to soak repeatedly, until eliminate Burst Tendency completely; (7), according to construction operation cost, technique fussy degree and effect and the time of eliminating Burst Tendency of Coal Seam, contrast with the physics mode such as traditional coal seam water filling, relieving shot and boring release, inspection chemical mode prevents and treats the practical application effect of low-order coal bump.Contrast the effect of construction operation cost and elimination bump under the same conditions, if confirm that adopting NaOH solution to eliminate Burst Tendency not only can save construction cost, can also raise the efficiency, just show that this chemical mode control Bumping Pressure in Coal Layers technique has significant effect and promotional value in low coal rank.
Claims (4)
1. the method for chemical reaction control Bumping Pressure in Coal Layers, is characterized in that: comprise the following steps successively:
(1), select to there is rock blast hazard and the coal seam of vitrinite reflectance < 0.6%;
(2), in coal seam, select certain area to hole, the quantity of boring, the degree of depth and direction meet even cloth hole requirement;
(3), by the port closing of boring;
(4), aqueous slkali is configured;
(5), the aqueous slkali infusion of configuration in boring, a period of time is soaked;
(6), adopt microseism, electromagnetic radiation or drilling cuttings mode to monitor, guarantee to eliminate Burst Tendency, repeat to soak repeatedly, until eliminate Burst Tendency completely;
(7), with conventional physical mode prevent and treat bump measure and compare, inspection chemical reaction mode prevents and treats the effect of bump;
[OH in described aqueous slkali
-] > 1 mol/L, aqueous slkali contacts with low order coal seam, namely chemical reaction occurs, and coal seam mechanical strength sharply reduces, and presents plasticity, loses Burst Tendency.
2. the method for chemical reaction control Bumping Pressure in Coal Layers according to claim 1, it is characterized in that: in described step (2), certain area refers to that digging produces stress and concentrates the position that maybe will produce stress and concentrate, or has the coal seam of Burst Tendency.
3. the method for chemical reaction control Bumping Pressure in Coal Layers according to claim 1, is characterized in that: in described step (5), soak time is greater than 6 h, along with concentration and the soak time of corresponding raising aqueous slkali are improved in coal rank.
4. the method for chemical reaction control Bumping Pressure in Coal Layers according to claim 1, is characterized in that: compare content in described step (7) and comprise operating cost, eliminate the speed of Burst Tendency and construction fussy degree.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103470296B (en) * | 2013-09-03 | 2016-05-18 | 河南理工大学 | A kind of dust removing down-hole of coal mine method of utilizing aqueous slkali |
| CN104005766A (en) * | 2014-05-12 | 2014-08-27 | 山西蓝焰煤层气集团有限责任公司 | Chemical method for weakening of top coal |
| CN104358585B (en) * | 2014-11-29 | 2016-04-13 | 西安科技大学 | A kind of coal mass relief method of severe inclined thick coal seam |
| CN110630267B (en) * | 2019-09-23 | 2021-08-24 | 辽宁大学 | Water injection formula for reducing impact tendency of coal seam water injection and detection device for coal seam water injection effect |
| CN115492575A (en) * | 2022-09-20 | 2022-12-20 | 山东理工大学 | Alkali liquor modification and strengthening pressure relief method for coal bed rock burst drilling |
| CN117588261B (en) * | 2023-10-19 | 2024-04-16 | 西安科技大学 | Method for sensing ground stress concentration of coal mine tunnel digging and anchoring integrated working face |
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Patent Citations (5)
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| US4256568A (en) * | 1979-11-19 | 1981-03-17 | Exxon Research & Engineering Co. | Removal of phenols from phenol-containing streams |
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