CN104847406A - Method for fracturing retained filled wall of adjacent coal face - Google Patents
Method for fracturing retained filled wall of adjacent coal face Download PDFInfo
- Publication number
- CN104847406A CN104847406A CN201510134567.2A CN201510134567A CN104847406A CN 104847406 A CN104847406 A CN 104847406A CN 201510134567 A CN201510134567 A CN 201510134567A CN 104847406 A CN104847406 A CN 104847406A
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- China
- Prior art keywords
- filled wall
- face
- coal
- fracturing
- filled
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Classifications
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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
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
- E21F15/04—Stowing mats; Goaf wire netting; Partition walls
Abstract
Disclosed is a method for fracturing a retained filled wall of an adjacent coal face. The method is applicable to continuous pressure relief mining of deep coal seam groups. The method comprises the steps that the arrangement mode and parameters of drilled holes and the explosive load are designed according to the size, the construction mode and the earlier-stage breakage state of the filled wall; one to three rows of downwards-inclined reused drilled holes for construction of the filled wall are retained by a leading coal face for the adjacent coal face in a roadway; one to two columns of drilled holes which are formed in the rear portion of the interior of an end hydraulic support are filled with slurry and explosives and are sealed; and the drilled holes which are formed in the rear portion of the interior of the end hydraulic support and filled with the explosives enter the position behind the coal face along with propulsion of the coal face, fracturing of the filled wall is enhanced through microcracks generated by the earlier-stage mine pressure of the filled wall, and finally the retained filled wall is fractured through the combination between the microcracks and the lagged mining-induced stress influence. According to the invention, the filled wall retained by the adjacent coal face in goaf can be fractured, and therefore the influence of the filled wall on stress concentration in an upper adjacent coal seam and a lower adjacent coal seam is effectively eliminated, the purpose of continuous pressure relief is achieved, and the potential safety hazard of adjacent coal seam mining is eliminated.
Description
Technical field
The present invention relates to the method that the adjacent coal-face of a kind of fracturing leaves over filled wall, be particularly useful for the continuous Depressurized mining of deep fractures group.
Background technology
Gob side entry retaining constructs the body of wall with certain supporting capacity along edge, goaf, remained by adjacent coal-face stope drift active workings, uses as the back production of this coal-face.It is one of key technology of the continuous Depressurized mining of deep fractures group, for solving the safety difficulties such as impulsion pressure, coal and gas prominent, high methane, highland pressure.
It is more and more general that gob side entry retaining body of wall constructed by current employing cement base class material, especially mining area, deep.The rapid hardening of cement base class body of wall is early strong, is aided with the reinforcement such as shear anchor arm, three-dimensional reinforcing rib means, substantially can ensures that two coal-face stope drift active workings normally use.Although cement base class body of wall is by twice mining influence germinating microfissure, but still continues to increase resistance, can not self destruction load-carrying properties, in upper and lower adjacent coal seam, define stress-concentrated area, do not reach the object of continuous release, remain the potential safety hazard of adjacent coal seam exploitation.Therefore, at present in the urgent need to providing a kind of method, when the back production of this coal-face, the adjacent coal-face of aggravation fracturing is retained in the filled wall in goaf, destroys its supporting capacity.
Summary of the invention
Technical problem: the object of the invention is the deficiency overcome in prior art, provides the adjacent coal-face of a kind of fracturing to leave over the method for filled wall.
Technical scheme: the method that the adjacent coal-face of fracturing of the present invention leaves over filled wall is as follows:
A, according to filled wall size, construct mode and early stage damage state based, design bore arrangement mode and parameter, explosive payload;
B, advanced coal-face, in lane to adjacent coal-face retain multiplexing filled wall construction 1 ~ 3 row tilt under to boring;
C, coal mining, charging synchronously carry out, and powder charge step pitch is not more than the passing step pitch of end hydraulic support, to 1 ~ 2 row well cementing powder charge at rear in the hydraulic support frames of termination; Described grouting slurry is mixed water by SCA-I or SCA-II type static fracturing agents and is made, and drilling orifice yellow mud or polyurethane foam carry out sealing of hole;
D, propelling along with coal-face, in end hydraulic support frame, the boring of rear powder charge enters coal-face rear, the bulbs of pressure are produced after 3 ~ 8h, utilize the microfissure of filled wall ore deposit in early stage pressure germinating, aggravation filled wall cracking, in conjunction with delayed mining induced stress impact, leave over filled wall finished breaking;
E, repetition step b, c, until the adjacent coal-face of fracturing.
Under described inclination to bore inclining angle be 10 ~ 25 °, aperture is 40 ~ 100mm, and pitch-row is 0.4 ~ 0.8m, and array pitch is 0.3 ~ 0.7m, eyelet apart from top, base plate 0.5 ~ 1.0m, the side, goaf of bottom hole pitch filled wall is 20 ~ 30cm.
The aqua ratio of described grouting slurry is 0.25 ~ 0.35, and the explosive payload of unit volume filled wall static breaking agent is 10 ~ 25kg.
Beneficial effect: owing to have employed technique scheme, the present invention compared with prior art: effective, cost is low, operates simple and easy, safe and reliable.Concrete advantage is as follows:
1) static fracturing agents expansion great efforts, utilize the microfissure of filled wall ore deposit in early stage pressure germinating, aggravation fracturing adjacent coal-face is retained in the filled wall in goaf, and in conjunction with the effect of delayed mining induced stress, makes filled wall finished breaking.Overlying strata can fully sink, and effectively eliminate body of wall and concentrate impact to the stress in upper and lower adjacent coal seam, achieve the object of continuous release, solve the potential safety hazard of adjacent coal seam exploitation.
2) in Static crushing process, do not produce slungshot, dust, waste gas, safety factor is high.
3) advance borehole is tilted 10 ~ 25 °, is convenient to workman's operation, and part make use of body of wall and easily occurs, along the characteristic of 45 ° of sloping section fragility tensile failures, effectively to have saved crushing power, reduced broken cost.
4) operation in the advanced coal-face of workman or end hydraulic support frame, job safety.
5) operation is simple, and handled easily, workman's operation intensity is low, and the activity duration is few.
Accompanying drawing explanation
Schematic top plan view when Fig. 1 is coal-face back production of the present invention;
Fig. 2 is that near end hydraulic support of the present invention, schematic diagram is arranged in boring;
Fig. 3 is wall body hole cross-sectional schematic of the present invention.
In figure: 1-filled wall; 2-holes; 3-coal-face; The adjacent coal-face of 4-; 5-static fracturing agents; 6-end hydraulic support; 7-yellow mud or polyurethane foam.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
The adjacent coal-face of fracturing of the present invention leaves over the method for filled wall, and concrete steps are as follows:
A, according to filled wall 1 size, construct mode and early stage damage state based, design boring 2 arrangement and parameter, explosive payload;
B, advanced coal-face 3, in lane to adjacent coal-face 4 retain multiplexing filled wall 1 construct 1 ~ 3 row tilt under to boring 2; Under described inclination to boring 2 angle of inclination be 10 ~ 25 °, aperture is 40 ~ 100mm, and pitch-row is 0.4 ~ 0.8m, and array pitch is 0.3 ~ 0.7m, eyelet apart from top, base plate 0.5 ~ 1.0m, the side, goaf of bottom hole pitch filled wall 1 is 20 ~ 30cm.
C, coal mining, charging synchronously carry out, and powder charge step pitch is not more than the passing step pitch of end hydraulic support 6, to be in the milk powder charge to 1 ~ 2 row boring 2 at rear in end hydraulic support 6 frame; Described grouting slurry is mixed water by SCA-I or SCA-II type static fracturing agents 5 and is made, and drilling orifice yellow mud or polyurethane foam 7 carry out sealing of hole; The aqua ratio of described grouting slurry is 0.25 ~ 0.35, and the explosive payload of unit volume filled wall 1 static breaking agent 5 is 10 ~ 25kg.
D, propelling along with coal-face 3, in end hydraulic support 6 frame, the boring 2 of rear powder charge enters coal-face 3 rear, the bulbs of pressure are produced after 3 ~ 8h, utilize the microfissure of filled wall 1 ore deposit in early stage pressure germinating, aggravation filled wall (1) cracking, in conjunction with delayed mining induced stress impact, leave over filled wall 1 finished breaking;
E, repetition step b, c, until complete the adjacent coal-face of fracturing.
Embodiment 1, the adjacent coal-face in certain ore deposit 4 retains multiplexing filled wall 1 wide × height=3m × 2.6m, adopt pumping C30 ointment material to construct, and be aided with shear anchor arm.During 3 back production of this coal-face, stress concentrates peak value to appear at first advance 13m, and the factor of stress concentration reaches 1.67, and herein, filled wall 1 total quality is good, and a small amount of crackle appears in surface.
Advanced coal-face 3 is apart from 30m, and to boring 2 construct 2 rows' inclinations to filled wall 1 in lane under, 15 °, angle of inclination, aperture 50mm, pitch-row 0.6m, array pitch 0.6m, eyelet distance top board 1.0m, apart from base plate 1.0m, bottom hole pitch filled wall 1 opposite side 25cm.
Coal mining, charging are synchronously carried out.Be not more than the principle of the passing step pitch of end hydraulic support 6 according to powder charge step pitch, the passing step pitch 0.6m of end hydraulic support 6, determine the 1 row well cementing powder charge to rear in end hydraulic support 6 frame.Adopt SCA-II type static fracturing agents 5, aqua is than about 0.3, and aperture stays about 10cm yellow mud 7 to carry out sealing of hole.Explosive payload 10 ~ the 25kg of unit volume filled wall 1 static breaking agent 5.
Along with the propelling of coal-face 3, the boring 2 of powder charge enters coal-face 3 rear, produces the bulbs of pressure after 3 ~ 8h, and utilize the microfissure of filled wall 1 ore deposit in early stage pressure germinating, aggravation filled wall 1 ftractures.In conjunction with delayed mining induced stress impact, leave over filled wall 1 finished breaking.
As shown in Figure 1, Figure 2, Figure 3 shows.
Claims (3)
1. the adjacent coal-face of fracturing leaves over a method for filled wall, it is characterized in that comprising the steps:
A, according to filled wall (1) size, construct mode and early stage damage state based, design boring (2) arrangement and parameter, explosive payload;
B, advanced coal-face (3), in lane to adjacent coal-face (4) retain multiplexing filled wall (1) construction 1 ~ 3 row tilt under to boring (2);
C, coal mining, charging synchronously carry out, and powder charge step pitch is not more than the passing step pitch of end hydraulic support (6), to 1 ~ 2 row boring (2) the grouting powder charge at rear in end hydraulic support (6) frame; Described grouting slurry is mixed water by SCA-I or SCA-II type static fracturing agents (5) and is made, and drilling orifice yellow mud or polyurethane foam (7) carry out sealing of hole;
D, propelling along with coal-face (3), in end hydraulic support (6) frame, the boring (2) of rear powder charge enters coal-face (3) rear, the bulbs of pressure are produced after 3 ~ 8h, utilize the microfissure of filled wall (1) ore deposit in early stage pressure germinating, aggravation filled wall (1) cracking, in conjunction with delayed mining induced stress impact, leave over filled wall (1) finished breaking;
E, repetition step b, c, until the adjacent coal-face of fracturing.
2. the adjacent coal-face of fracturing according to claim 1 leaves over the method for filled wall, it is characterized in that: under described inclination to boring (2) angle of inclination be 10 ~ 25 °, aperture is 40 ~ 100mm, pitch-row is 0.4 ~ 0.8m, array pitch is 0.3 ~ 0.7m, eyelet is apart from top, base plate 0.5 ~ 1.0m, and the side, goaf of bottom hole pitch filled wall (1) is 20 ~ 30cm.
3. the adjacent coal-face of fracturing according to claim 1 leaves over the method for filled wall, it is characterized in that: the aqua ratio of described grouting slurry is 0.25 ~ 0.35, and the explosive payload of unit volume filled wall (1) static breaking agent (5) is 10 ~ 25kg.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510134567.2A CN104847406B (en) | 2015-03-25 | 2015-03-25 | Method for fracturing retained filled wall of adjacent coal face |
| AU2015387618A AU2015387618B2 (en) | 2015-03-25 | 2015-11-30 | Method for fracturing filler wall left behind in adjacent coal-mining face |
| PCT/CN2015/095914 WO2016150188A1 (en) | 2015-03-25 | 2015-11-30 | Method for fracturing filler wall left behind in adjacent coal-mining face |
| ZA2017/01756A ZA201701756B (en) | 2015-03-25 | 2017-03-10 | Method for fracturing filler wall left behind in adjacent coal-mining face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510134567.2A CN104847406B (en) | 2015-03-25 | 2015-03-25 | Method for fracturing retained filled wall of adjacent coal face |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104847406A true CN104847406A (en) | 2015-08-19 |
| CN104847406B CN104847406B (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510134567.2A Active CN104847406B (en) | 2015-03-25 | 2015-03-25 | Method for fracturing retained filled wall of adjacent coal face |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN104847406B (en) |
| AU (1) | AU2015387618B2 (en) |
| WO (1) | WO2016150188A1 (en) |
| ZA (1) | ZA201701756B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016150188A1 (en) * | 2015-03-25 | 2016-09-29 | 中国矿业大学 | Method for fracturing filler wall left behind in adjacent coal-mining face |
| CN107035370A (en) * | 2017-05-05 | 2017-08-11 | 太原理工大学 | One kind cuts top pressure relief method for gob side entry retaining static crushing |
| CN110761792A (en) * | 2019-12-02 | 2020-02-07 | 六盘水师范学院 | Old hole cutting device for coal face and application method |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761543B (en) * | 2016-12-02 | 2019-07-19 | 淮北矿业股份有限公司 | A method of drilling misses section by goaf |
| CN109252891B (en) * | 2018-11-05 | 2023-09-19 | 徐州中矿大贝克福尔科技股份有限公司 | Paste filling continuous flexible sealing device and isolation method |
| CN113217093B (en) * | 2021-06-21 | 2024-04-16 | 扬州中矿建筑新材料科技有限公司 | Foldable framework film bag filling wall/body for gob-side entry retaining and construction method |
| CN114856567A (en) * | 2022-05-16 | 2022-08-05 | 中国矿业大学(北京) | Method for determining layout position of coal seam mining roadway under short-distance variable-interval condition |
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2015
- 2015-03-25 CN CN201510134567.2A patent/CN104847406B/en active Active
- 2015-11-30 WO PCT/CN2015/095914 patent/WO2016150188A1/en active Application Filing
- 2015-11-30 AU AU2015387618A patent/AU2015387618B2/en not_active Ceased
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2017
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| WO2016150188A1 (en) * | 2015-03-25 | 2016-09-29 | 中国矿业大学 | Method for fracturing filler wall left behind in adjacent coal-mining face |
| CN107035370A (en) * | 2017-05-05 | 2017-08-11 | 太原理工大学 | One kind cuts top pressure relief method for gob side entry retaining static crushing |
| CN110761792A (en) * | 2019-12-02 | 2020-02-07 | 六盘水师范学院 | Old hole cutting device for coal face and application method |
| CN110761792B (en) * | 2019-12-02 | 2023-05-16 | 六盘水师范学院 | Overold cutting device for coal face and application method |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2015387618B2 (en) | 2018-11-01 |
| ZA201701756B (en) | 2019-06-26 |
| CN104847406B (en) | 2017-04-12 |
| AU2015387618A1 (en) | 2017-07-06 |
| WO2016150188A1 (en) | 2016-09-29 |
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Inventor after: Pan Dongjiang Inventor after: Zhang Nong Inventor after: Lv Chuangxin Inventor after: Han Changliang Inventor after: Xue Fei Inventor before: Zhang Nong Inventor before: Pan Dongjiang Inventor before: Lv Chuangxin Inventor before: Han Changliang Inventor before: Xue Fei |
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