CN104712338A - Thick seam fully-mechanized caving faces double-layer hard-and-thick strata advance presplitting method - Google Patents

Thick seam fully-mechanized caving faces double-layer hard-and-thick strata advance presplitting method Download PDF

Info

Publication number
CN104712338A
CN104712338A CN201510019896.2A CN201510019896A CN104712338A CN 104712338 A CN104712338 A CN 104712338A CN 201510019896 A CN201510019896 A CN 201510019896A CN 104712338 A CN104712338 A CN 104712338A
Authority
CN
China
Prior art keywords
rock stratum
thick rock
hard thick
hole
hard
Prior art date
Application number
CN201510019896.2A
Other languages
Chinese (zh)
Inventor
秦广鹏
蒋金泉
曹静
张培鹏
Original Assignee
山东科技大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 山东科技大学 filed Critical 山东科技大学
Priority to CN201510019896.2A priority Critical patent/CN104712338A/en
Publication of CN104712338A publication Critical patent/CN104712338A/en

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C37/00Other methods or devices for dislodging with or without loading
    • E21C37/06Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
    • E21C37/12Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D3/00Particular applications of blasting techniques
    • F42D3/04Particular applications of blasting techniques for rock blasting

Abstract

The invention discloses a thick seam fully-mechanized caving faces double-layer hard-and-thick strata advance presplitting method, which relates to the technical field of coal mine safety. According to the invention, a presplitting mode of double-layer hard-and-thick strata low fragmentation, high fracture, hydraulic fracturing and mine pressure refracturing is designed, problem of difficult inbreak of the double-layer hard-and-thick strata can be solved, construction material consumption is less, engineering work load is less, manpower and material resources can be saved, production cost is reduced, enforcement effect is obvious, and the method has high practical application value.

Description

A kind of high seam fully mechanized coal face double-deck hard thick rock stratum Advance presplitting method
Technical field
The present invention relates to technical field of mine safety, specifically a kind of high seam fully mechanized coal face double-deck hard thick rock stratum Advance presplitting method.
Background technology
China's condition of coal seam occurrence is complicated, the coal seam belonging to tight roof accounts for about 1/3rd, and be distributed in the mining area of more than 50%, along with the development of comprehensive mechanical coal mining technology, have the fully-mechanized mining working of 38% to belong to come the strong tight roof of pressure, the large area outstanding dew characteristic of tight roof brings severe challenge to Mine Safety in Production.
The mechanical property many employings water filling in the past changing competent bed weakens top board, by the pressure break of water and softening, reduces rock mass strength and integrality, reaches the object of the easy inbreak of top board.But it is low that water filling also exists efficiency at present, the shortcomings such as some top board bating effect difference, improve efficiency, minimizing engineering quantity that water filling weakens top board, reduce the emphasis that water filling cost etc. is research and development water flood.
The integrality that blasting procedure caving destroys rock mass is a kind of feasible top board processing method, pre-explosion before wherein adopting, interference stoping work is less, but explosive energy dissipating is very large, and cost is higher, and particularly a large amount of explosives is in underground blasting, seriously polluted, the position of explosion is selected in top board tensile stress maximum region and the water component position that will control by the development from now on of this method, thus reduces borehole engineering amount and explosive consumption, reduces top board processing cost.Adopt shallow bore hole circulation caving and pace type Method With Longhole Roof Caving in rear explosion, interference stoping work, affects back production progress, is unfavorable for the mechanization production of high-yield and high-efficiency.
Although break in two lanes, top method does not affect stope production, and for the top board that some integrality is strong, caving effect is poor, and this method coordinates strong hydraulic support, still has certain scope of application, its essence is based on the control of high-drag support, and the disconnected top of explosion is for catching.And from taking the disconnected top of pace type under certain conditions, namely in the water component that support can bear, shape deep hole of fanning, the disconnected top of explosion, force top board by step pitch inbreak.
In the past to the effect of all single dependence water under high pressure of the process of tight roof or explosive, and do not consider the main pressure break effect of mine pressure to presplitting rock stratum, thus under equal regulation effect, engineering quantity is large, material cost is high.
Summary of the invention
For solving the technical problem of above-mentioned existence, the invention provides a kind of high seam fully mechanized coal face double-deck hard thick rock stratum Advance presplitting method, with working face mining lead abutment pressure for major contributor, on the basis utilizing explosive hard thick rock stratum presplit blasting process to high-low position, be aided with the high pressure water injection fracturing in presplitting crack, compared with the hard thick strata control method of routine, there is the advantage that engineering quantity is little, material consumption is few, implementation result is good.
A kind of high seam fully mechanized coal face double-deck hard thick rock stratum Advance presplitting method, is realized by following steps:
1) according to work plane covering hard thick rock stratum support conditions, calculating hard thick rock stratum breaking span, determining circulation explosive distance;
2) according to explosive property parameter and hard thick rock stratum physical and mechanical parameter, calculate blasting crack district scope, determine steel for shot parameter;
3), in work plane air intake lane and tailentry, in the hard thick rock stratum of low level, arrange fan-shaped rotary big gun hole along stope direction of propulsion, presplit blasting is carried out to the hard thick rock stratum of low level;
4) in work plane air intake lane and tailentry, in the hard thick rock stratum of a high position, arrange that trend blocks hole, be freely-supported supporting or free support condition by the boundary supports condition setting of hard for a high position thick rock stratum, carry out cracked to the hard thick rock stratum of a high position;
5) after the hard thick rock stratum presplit blasting of low level, select the fan-shaped rotary big gun hole of the hard thick rock stratum of low level as high pressure water injection hole, carry out high pressure water injection, further pressure break rock mass, expand the scope of rock crack development area.
In step 3), line at the bottom of hole, fan-shaped rotary big gun hole and top board natural fracture half O-X break and enclose triangle arc plate fissure zone and distribute basically identical.
The presplit blasting of the hard thick rock stratum of low level described in step 3) needs to stay the topping establishing 2-3 rice.
In step 4), trend blocks the hard Hou Yan top that to attain to a high place at the bottom of hole, big gun hole, blocks corresponding high-order hard thick rock stratum, big gun hole part carry out powder charge and controlled loading of explosive amount is no more than 60% of big gun hole length in trend.
The water injection pressure of step 5) mesohigh water injection hole is not less than 10Mpa, and single hole water injection time is not less than 60min.
Step 3), 4), 5) in the hard thick rock stratum explosion presplitting of high-low position and high pressure water injection all carry out beyond bearing pressure peak ranges.
The present invention devises the presplitting pattern of cracked, the high-order fracture of double-deck hard thick rock stratum low level, hydrofracturing, mine pressure fracturing quaternity again, by determining ahead work face bearing pressure scope, beyond bearing pressure scope, presplit blasting is implemented to hard thick rock stratum double-deck above high seam, realize effective inbreak of roof; By hard thick rock stratum breaking span under calculating different boundary support conditions, determine rational presplit blasting step pitch; Along work plane air intake lane and return airway, in the hard thick rock stratum of low level, arranging fan-shaped rotary big gun hole to advance of the face direction, realizing effective fragmentation of end, low level hard thick rock stratum, with adopting with emitting; Along work plane air intake lane and return airway, arrange that trend is blocked hole and blocked explosion to the hard thick rock stratum enforcement kerve of a high position, change the support conditions of high-order hard thick rock stratum, the effective revolution realizing high-order hard thick rock stratum is ruptured; High pressure water injection is implemented to presplitting deep hole after explosion, utilizes high hydraulic pressure to the further fracturing in quick-fried raw crack; Presplit blasting and high pressure water injection are all implemented beyond bearing pressure peak region, realize presplitting and hydraulic pressure crack further expanding under Action of Fixed Abutment Pressure, the real problem solving double-deck hard thick rock stratum and be difficult to inbreak, construction material consumption is few, engineering quantity is little, uses manpower and material resources sparingly, and reduces cost of production, implementation result is remarkable, is of very high actual application value.
Accompanying drawing explanation
Fig. 1 rock stratum O-X type is disrumpent feelings form schematic diagram;
The cracked explosion schematic diagram in the hard thick rock stratum of Fig. 2 low level;
Fig. 3 high-order hard thick rock stratum kerve blocks explosion generalized section;
Fig. 4 high-order hard thick rock stratum kerve blocks blasting hole plane of arrangement schematic diagram;
The hard thick rock stratum presplitting big gun hole high pressure of Fig. 5 low level water filling schematic diagram again.
Detailed description of the invention
As Figure 1-5, this high seam fully mechanized coal face double-deck hard thick rock stratum Advance presplitting method, realizes as follows:
1) according to work plane covering hard thick rock stratum support conditions, calculating hard thick rock stratum breaking span, determining circulation explosive distance;
2) according to explosive property parameter and hard thick rock stratum physical and mechanical parameter, calculate blasting crack district scope, determine steel for shot parameter;
3), in work plane air intake lane 1 and return airway 2, in the hard thick rock stratum 6 of low level, arrange fan-shaped rotary big gun hole 4 along work plane 3 direction of propulsion, presplit blasting is carried out to the hard thick rock stratum 6 of low level;
4), in work plane air intake lane 1 and return airway 2, in the hard thick rock stratum 7 of a high position, arrange that trend blocks hole 5, be freely-supported supporting or free support condition by the boundary supports condition setting of hard for a high position thick rock stratum 7, carry out cracked to the hard thick rock stratum 7 of a high position;
5) after hard thick rock stratum 6 presplit blasting of low level, select the fan-shaped rotary big gun hole 4 of the hard thick rock stratum 6 of low level as high pressure water injection hole 8, carry out high pressure water injection, further pressure break rock mass, expand the scope of rock crack development area.
As preferred mode, in step 3), line and top board natural fracture half O-X at the bottom of hole, fan-shaped rotary big gun hole 4 break and enclose triangle arc plate fissure zone and distribute basically identical.
As preferred mode, the presplit blasting of the hard thick rock stratum 6 of low level described in step 3) needs to stay the topping establishing 2-3 rice.
As preferred mode, in step 4), trend blocks hard thick rock 7 top that to attain to a high place at the bottom of hole, big gun hole 5, blocks corresponding high-order hard thick rock stratum 7, big gun hole 5 part carry out powder charge and controlled loading of explosive amount is no more than 60% of big gun hole length in trend.
As preferred mode, the water injection pressure of step 5) mesohigh water injection hole 8 is not less than 10Mpa, and single hole water injection time is not less than 60min.
As preferred mode, step 3), 4), 5) in the hard thick rock stratum explosion presplitting of high-low position and high pressure water injection all carry out beyond bearing pressure peak ranges.
Describe the present invention below in conjunction with specific embodiment, a kind of high seam fully mechanized coal face double-deck hard thick rock stratum Advance presplitting method that the present invention sets forth, realizes especially by following steps:
(1) according to bilayer hard thick rock stratum physical and mechanical parameter, judge whether double-deck hard thick rock stratum is synchronized with the movement by following formula, different according to stope 3 covering hard thick rock stratum support conditions, calculate the breaking span of double-deck hard thick rock stratum, according to the rock stratum breaking span of theory calculate, select 1/3 ~ 1/4 of the theoretical breaking span in low level rock stratum as circulation explosive distance.
(2) according to explosive property parameter and hard thick rock stratum physical and mechanical parameter, calculate blasting crack district scope, determine steel for shot parameter;
(3) arrange that in work plane air intake lane 1 and tailentry 24 pairs, fan-shaped rotary big gun hole end regions top board carries out weakening blast overhead caving, the direction of propulsion of stope 3 is pointed in the hard thick rock stratum 6 presplit blasting fan-shaped rotary big gun hole 4 of low level, line at the bottom of preferably apertures and top board natural fracture half O-X break and enclose triangle arc plate fissure zone and distribute basically identical, carry out cracked to the hard thick rock stratum 6 of low level, construction working carries out in work plane air intake lane 1 and tailentry 2 simultaneously, also needs to arrange that presplitting deep hole carries out disconnected top to stope 3 central region top board.
Presplit blasting must ensure the integrality in coal seam, needs the topping of reserved 2-3m above top board, and blast hole projectile filling section must control side on the protection layer; and ensure sealing of hole segment length; avoid punching, ensure the effect of presplitting, avoid punching to the destruction of wall and top board simultaneously.
(4) along work plane air intake lane 1 and tailentry 2, arrange that trend blocks hole 5 in the hard thick rock stratum 7 of a high position, be freely-supported supporting or free support condition by the boundary supports condition setting of hard for a high position thick rock stratum 7, carry out cracked to the hard thick rock stratum 7 of a high position.
In the hard thick rock stratum 7 of a high position, preferably arrange that trend blocks big gun hole 5, trend blocks the top, hard thick rock stratum that should to attain to a high place at the bottom of hole, big gun hole 5, blocks corresponding high-order hard thick rock stratum 7, big gun hole 5 part carry out powder charge and controlled loading of explosive amount is no more than 60% of big gun hole length in trend.
(5) fan-shaped rotary big gun hole, low level hard thick rock stratum 4 is utilized, in the laggard horizontal high voltage water filling of hard thick rock stratum 6 presplit blasting of low level.In work plane air intake lane 1, tailentry 2 interval select low level fan-shaped rotary big gun hole 4 as high pressure water injection hole 8, rig is utilized original sealing of hole section again to be emptied, in orifice area, hole packer is installed, utilize coal-bed flooding pump to hard thick rock stratum 6 water filling of low level after presplitting, water injection pressure is not less than 10Mpa.When carrying out water filling to coal body, actual single hole water injection time is about 5-6min, and consider rock stratum water filling, actual single hole water injection time should be not less than 60min, or to be as the criterion calculating with rib and other scope water seepages.
The above-mentioned presplit blasting to the hard thick rock stratum 6 of low level and the hard thick rock stratum 7 of a high position and high pressure water injection are all implemented beyond bearing pressure peak region, utilize mine pressure to explosion presplitting crack and hydraulic pressure presplitting crack fracturing again.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited in above-mentioned citing, and the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.

Claims (6)

1. a high seam fully mechanized coal face double-deck hard thick rock stratum Advance presplitting method, be is characterized in that, realized by following steps:
1) according to work plane covering hard thick rock stratum support conditions, calculating hard thick rock stratum breaking span, determining circulation explosive distance;
2) according to explosive property parameter and hard thick rock stratum physical and mechanical parameter, calculate blasting crack district scope, determine steel for shot parameter;
3), in work plane air intake lane (1) and tailentry (2), in the hard thick rock stratum (6) of low level, arrange fan-shaped rotary big gun hole (4) along stope (3) direction of propulsion, presplit blasting is carried out to the hard thick rock stratum (6) of low level;
4) in work plane air intake lane (1) and tailentry (2), in the hard thick rock stratum (7) of a high position, arrange that trend blocks hole (5), be freely-supported supporting or free support condition by the boundary supports condition setting of hard for a high position thick rock stratum (7), carry out cracked to the hard thick rock stratum (7) of a high position;
5) after the presplit blasting of low level hard thick rock stratum (6), select the fan-shaped rotary big gun hole (4) of the hard thick rock stratum (6) of low level as high pressure water injection hole (8), carry out high pressure water injection, further pressure break rock mass, expand the scope of rock crack development area.
2. the double-deck hard thick rock stratum of a kind of high seam fully mechanized coal face according to claim 1 Advance presplitting method, it is characterized in that, in step 3), line at the bottom of fan-shaped rotary big gun hole (4) hole and top board natural fracture half O-X break and enclose triangle arc plate fissure zone and distribute basically identical.
3. the double-deck hard thick rock stratum of a kind of high seam fully mechanized coal face according to claim 1 and 2 Advance presplitting method, it is characterized in that, the presplit blasting of the hard thick rock stratum (6) of low level described in step 3) needs to stay the topping establishing 2-3 rice.
4. the double-deck hard thick rock stratum of a kind of high seam fully mechanized coal face according to claim 1 Advance presplitting method, it is characterized in that, in step 4), trend blocks hard thick rock (7) top that to attain to a high place at the bottom of big gun hole (5) hole, blocks corresponding high-order hard thick rock stratum (7) part in big gun hole (5) carry out powder charge and controlled loading of explosive amount is no more than 60% of big gun hole length in trend.
5. the double-deck hard thick rock stratum of a kind of high seam fully mechanized coal face according to claim 1 Advance presplitting method, it is characterized in that, the water injection pressure of step 5) mesohigh water injection hole (8) is not less than 10Mpa, and single hole water injection time is not less than 60min.
6. a kind of high seam fully mechanized coal face double-deck hard thick rock stratum Advance presplitting method according to claim 1,2,4 or 5, is characterized in that: in step (3), (4), (5), the hard thick rock stratum explosion presplitting of high-low position and high pressure water injection are all carried out beyond bearing pressure peak ranges.
CN201510019896.2A 2015-01-15 2015-01-15 Thick seam fully-mechanized caving faces double-layer hard-and-thick strata advance presplitting method CN104712338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510019896.2A CN104712338A (en) 2015-01-15 2015-01-15 Thick seam fully-mechanized caving faces double-layer hard-and-thick strata advance presplitting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510019896.2A CN104712338A (en) 2015-01-15 2015-01-15 Thick seam fully-mechanized caving faces double-layer hard-and-thick strata advance presplitting method

Publications (1)

Publication Number Publication Date
CN104712338A true CN104712338A (en) 2015-06-17

Family

ID=53412018

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510019896.2A CN104712338A (en) 2015-01-15 2015-01-15 Thick seam fully-mechanized caving faces double-layer hard-and-thick strata advance presplitting method

Country Status (1)

Country Link
CN (1) CN104712338A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108643910A (en) * 2018-05-04 2018-10-12 太原理工大学 A method of controlling caving for coal mine stope tight roof Advance presplitting
CN108732023A (en) * 2018-05-18 2018-11-02 西安科技大学 A kind of determination method of Coal Face with Greater Mining Height coal wall lead abutment pressure peak factor
CN110685691A (en) * 2019-11-16 2020-01-14 山东科技大学 Forced roof caving method for hard roof

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400035A (en) * 1980-04-15 1983-08-23 Tatabanyai Szenbanyak Process for the extraction of thick coal seams
CN1975113A (en) * 2005-11-28 2007-06-06 李继水 Coal mine pressed pulsed infusion technology
CN101644156A (en) * 2009-07-17 2010-02-10 中国矿业大学 Method for weakening coal-rock mass by hydraulic blasting and fracturing
CN102678120A (en) * 2012-05-18 2012-09-19 河南大有能源股份有限公司 Method for releasing pressure and removing danger of rock burst
CN103089269A (en) * 2013-01-23 2013-05-08 中国矿业大学 Method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power
CN103321642A (en) * 2013-05-06 2013-09-25 中国矿业大学 Gob-side entry retaining adjoining rock stabilizing method based on lateral rock formation pre-splitting control
CN103334790A (en) * 2013-07-23 2013-10-02 辽宁工程技术大学 High-pressure gas blasting-based coal seam roof advance presplitting method
CN103527198A (en) * 2013-10-21 2014-01-22 中国矿业大学 Hydraulic fracturing control method of cut tight roof/top coal
CN103924956A (en) * 2014-04-29 2014-07-16 西安科技大学 Advanced pre-splitting method for lump coal mining
CN103939101A (en) * 2014-04-29 2014-07-23 西安科技大学 Lump coal mining method
CN103939099A (en) * 2014-04-11 2014-07-23 中国矿业大学 Method for controlling strong shock risk coal seam group rock burst

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400035A (en) * 1980-04-15 1983-08-23 Tatabanyai Szenbanyak Process for the extraction of thick coal seams
CN1975113A (en) * 2005-11-28 2007-06-06 李继水 Coal mine pressed pulsed infusion technology
CN101644156A (en) * 2009-07-17 2010-02-10 中国矿业大学 Method for weakening coal-rock mass by hydraulic blasting and fracturing
CN102678120A (en) * 2012-05-18 2012-09-19 河南大有能源股份有限公司 Method for releasing pressure and removing danger of rock burst
CN103089269A (en) * 2013-01-23 2013-05-08 中国矿业大学 Method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power
CN103321642A (en) * 2013-05-06 2013-09-25 中国矿业大学 Gob-side entry retaining adjoining rock stabilizing method based on lateral rock formation pre-splitting control
CN103334790A (en) * 2013-07-23 2013-10-02 辽宁工程技术大学 High-pressure gas blasting-based coal seam roof advance presplitting method
CN103527198A (en) * 2013-10-21 2014-01-22 中国矿业大学 Hydraulic fracturing control method of cut tight roof/top coal
CN103939099A (en) * 2014-04-11 2014-07-23 中国矿业大学 Method for controlling strong shock risk coal seam group rock burst
CN103924956A (en) * 2014-04-29 2014-07-16 西安科技大学 Advanced pre-splitting method for lump coal mining
CN103939101A (en) * 2014-04-29 2014-07-23 西安科技大学 Lump coal mining method

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
李冰冰等: "综放工作面初采强制放顶技术应用及优化措施", 《煤炭技术》 *
秦广鹏等: "硬厚岩层破断机理薄板分析及控制技术", 《采矿与安全工程学报》 *
秦广鹏等: "综放工作面初采期顶煤深孔爆破弱化试验研究", 《煤炭科学技术》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108643910A (en) * 2018-05-04 2018-10-12 太原理工大学 A method of controlling caving for coal mine stope tight roof Advance presplitting
CN108732023A (en) * 2018-05-18 2018-11-02 西安科技大学 A kind of determination method of Coal Face with Greater Mining Height coal wall lead abutment pressure peak factor
CN108732023B (en) * 2018-05-18 2020-09-11 西安科技大学 Method for determining advanced support pressure peak coefficient of coal wall of large mining height stope
CN110685691A (en) * 2019-11-16 2020-01-14 山东科技大学 Forced roof caving method for hard roof
CN110685691B (en) * 2019-11-16 2020-12-01 山东科技大学 Forced roof caving method for hard roof

Similar Documents

Publication Publication Date Title
Yuan Theory and practice of integrated coal production and gas extraction
CN103590831B (en) A kind of gentle dip is thin-the novel mining methods of middle thickness orebody
Ye et al. Study on hydraulic-controlled blasting technology for pressure relief and permeability improvement in a deep hole
CN105240013B (en) Broadwall N00 engineering methods
CN103924956B (en) A kind of lump coal exploitation Advance presplitting method
CN102914226B (en) Hollow-hole rhombic parallel cut blasting damping method
CN101975064B (en) Mechanical continuous mining method for gently inclined thin ore body
CN103195466B (en) A kind of directed hydraulic pressure demolition improves the method for gas permeability of coal seam
CN101644156B (en) Method for weakening coal-rock mass by hydraulic blasting and fracturing
CN102635356B (en) Medium-length hole mining method in multiple blasting free faces of high dipping thin veins
CN101832149B (en) Method for extracting coal seam gas by underground heat injection
CN101105129B (en) Mining environment reconstructed continuous mining afterwards filling mining method
Sotskov et al. Investigation of the rock massif stress strain state in conditions of the drainage drift overworking
CN104806244B (en) Filling mining method for slant middle-thick ore body
CN102536239B (en) Long-wall working face coal pillar-free mining method
CN102778182B (en) Beside-roadway topping pressure relief method of roadway driving along gob of small coal pillar influenced by dynamic pressure
Huang et al. Cavability control by hydraulic fracturing for top coal caving in hard thick coal seams
CN104481539B (en) From kerve tight-face blasting caved stopes
CN105735993B (en) A kind of method of the preventing and treating tight roof type bump based on carbon dioxide explosion
AU2013354613B2 (en) Method of local filling to control surface subsidence in worked-out area
CN104989405B (en) Mining steeply dipping coal seam bump orients prevention and controls
CN104863629A (en) Method for extracting gas from separation layer below overlying strata, draining water and grouting through combined drill hole
CN102493806B (en) Mechanized continuous mining method for wall-type gentle-inclined thin ore body
CN102678117B (en) Directional hydraulic fracturing method based on energizing blasting
CN102748029B (en) Segmented mining method

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20150617

WD01 Invention patent application deemed withdrawn after publication