CN104481568A - Fully mechanized caving face gob-side entry retaining process and ventilating method - Google Patents
Fully mechanized caving face gob-side entry retaining process and ventilating method Download PDFInfo
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- CN104481568A CN104481568A CN201410471041.9A CN201410471041A CN104481568A CN 104481568 A CN104481568 A CN 104481568A CN 201410471041 A CN201410471041 A CN 201410471041A CN 104481568 A CN104481568 A CN 104481568A
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- side entry
- entry retaining
- gob
- fully mechanized
- pier stud
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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
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention relates to a fully mechanized caving face gob-side entry retaining process and a ventilating method, and belongs to the technical field of mine supports and ventilating security. The process is applied to a high-gas thick-seam large-section roadway with poor conditions; an air inlet way, an air return way, a remained gob-side entry and a gas discharge way form an Y-I ventilating mode, and a problem of gas concentration exceeding limitation caused by corner methane accumulation on a coal mining working face is solved; the air return way behind a fully mechanized caving face is retained to serve as the gob-side entry, and gob-side entry retaining operation is performed, so that the mining without coal pillars is achieved, and the mining coefficient is ensured; a pier column serves as side way support, so that the side way supporting strength is improved; gangue is used for establishing an additional gangue wall on the outer side of the pier column of the side way support, so that the pressure on the pier column can be obviously reduced, and the impact of the roof fallen gangue in a gob on the pier column is avoided; and a layer of concrete is coated on a reinforcing steel bar net, so that air leakage of the gob is effectively avoided. The gob-side entry retaining process and the ventilating method are easy to implement and promote, and has excellent economic values.
Description
Technical field
The invention belongs to mine support and ventilation safety technical field, particularly relate to a kind of fully mechanized coal face gob side entry retaining technique and method of ventilation, be applicable to the fully mechanized coal face of high methane high seam.
Background technology
At present, when fully mechanized coal face exploitation high methane high seam, the coal-mining technique of application is comprehensive mechanization coal caving mining method, this coal-mining technique has that per unit area yield is high, utilization rate of equipment and installations is high and low cost and other advantages, but what adopt is but traditional U-shaped draft type, and adopting U-shaped draft type to there is obvious deficiency, Top Corner Gas on Coal Face very easily gathers and causes gas exceeding limit, brings great potential safety hazard to shaft production.
In order to solve the drawback that U-shaped draft type is brought, work plane adopts gob side entry retaining, along edge, goaf, original return airway is remained, forms Y type draft type, alleviate methane accumulation and transfinite, lower curtate work plane can also lack pick tunnel simultaneously, decreases the loss of coal.But edge air gallery technology is blanket is girdle and medium-thickness seam, in the high seam large section roadway that condition is poor, edge air gallery technology is still very difficult in supporting.Gob side entry retaining adopts grillage, pack wall to carry out roadside support in early days, although adopt this supporting method simple, the intensity of supporting is low, wood consumption is huge, and easily leak out in goaf, supporting is often subject to the extruding of erecting dense individual props spoil and topples over, and causes gob side entry retaining failure.
In order to reduce the inleakage in goaf, improve the intensity of supporting simultaneously, some mines are attempted adopting high water or paste body filling mode to carry out roadside support, but because filling process needs complete set and independently filling system, technical difficulty is large, and cost is higher, obturation is long for time of setting, initial setting strength is low, can not connect top in time, easily causes work plane worsening condition.
The fully mechanized coal face coal production of high methane, high seam is high, but gas emission is equally very large, a large amount of gas that goaf float coal discharges with contiguous pressure released seam can accumulate in the caving zone in goaf, and spread to coal-face upper corner, even if adopt the edge air gallery technology of girdle and medium-thickness seam, form Y type draft type, also cannot fundamentally solve methane accumulation and overrun issues.
Summary of the invention
For prior art Problems existing, the invention provides a kind of fully mechanized coal face gob side entry retaining technique and method of ventilation, the high methane high seam large section roadway that the condition that is applicable to is poor, and the supporting intensity of gob side entry retaining is high, effectively can prevent goaf air leaking, solve the gas exceeding limit problem that gas from being accumulated at corners on coal faces causes.
To achieve these goals, the present invention adopts following technical scheme: a kind of fully mechanized coal face gob side entry retaining technique and method of ventilation, comprise the steps:
Step one: arrange an air intake lane in fully mechanized coal face side, arranges a return airway at fully mechanized coal face opposite side;
Step 2: arrange a drawing-off gas lane in immediate roof or base object model, drawing-off gas lane and return airway are arranged in parallel;
Step 3: the return airway at fully mechanized coal face rear is remained as gob side entry retaining, and carry out gob-side entry retaining work;
Step 4: after gob-side entry retaining work completes, fresh wind flows into work plane by air intake lane and dilutes face gas, the dirty wind part being mixed with gas flows into return airway and gob side entry retaining, another part carries out return air by drawing-off gas lane, and then makes air intake lane and return airway, gob side entry retaining, drawing-off gas lane form " Y+I " type draft type of " enters three times ".
The concrete steps that the return airway at described fully mechanized coal face rear carries out gob side entry retaining are:
Step one: along with the advance of the face, determines the pre-installation position of pier stud in return airway, and installs hydraulic prop outside the pre-installation position of pier stud, carries out interim strengthening supporting;
Step 2: open a rectangle breach on the rib of tailentry side, and utilize anchor pole or anchor cable to carry out reinforce support;
Step 3: at the rear of working surface hydraulic support, utilizes anchor pole or anchor cable to mount steel mesh reinforcement;
Step 4: at the goaf side pile spoil bag near steel mesh reinforcement, form pack wall, wherein pack wall is anchored on base plate by firm anchor cable and baffle plate, prevents erecting dense individual props spoil from squeezing the pack wall that collapses, avoids pack wall to collapse to the impact of pier stud;
Step 5: spray a layer concrete on steel mesh reinforcement, prevent goaf air leaking;
Step 6: adopt artificial lifting or machinery operator to install pier stud, pier stud is installed on pre-installation position, and tight with the lumps of wood back of the body, make the lumps of wood and top coal rigid contact, pier stud installation;
Step 7: remove hydraulic prop;
Step 8: along with the continuation of work plane advances, repeats step one, two, three, four, five, six, seven, until whole working face mining terminates.
Described drawing-off gas lane is rectangular cross section, and lanewidth is 2 ~ 3m, and lane is high is 2 ~ 3m, is arranged in the work plane caving zone of immediate roof or base object model, adopts bolt-mesh-spurting supporting in the tunnel in drawing-off gas lane.
Described drawing-off gas lane vertically downward distance top coal is 2 ~ 4m, is 15 ~ 20m with return airway horizontal range L.
The installing space of described hydraulic prop is 0.5 ~ 2m.
The length of described rectangle breach is 2 ~ 3m, the width of rectangle breach is equal with the width of pack wall, the width of pack wall is 2 ~ 4m, pack wall distance pier stud is 0.2 ~ 0.5m, pier stud is the foam-filled reinforcing bar pier stud of concrete, pier stud diameter is 1 ~ 1.5m, the solid wood that the lumps of wood adopts compressive strength high and homogeneous.
The installing space of described anchor pole or anchor cable is 1 ~ 1.5m, and the length of anchor pole or anchor cable is 2 ~ 10m.
Described steel mesh reinforcement is the welded steel fabric of φ 5mm, and the size of mesh opening of welded mesh is 100 × 100m.
The length of described firm anchor cable is 6 ~ 10m, and the physical dimension of baffle plate is 500 × 500 × 5mm, and firm anchor cable arranges one every 3m.
Beneficial effect of the present invention:
The present invention is applicable to the poor high methane high seam large section roadway of condition, and air intake lane and return airway, gob side entry retaining, drawing-off gas lane form " Y+I " type draft type of " enters three times ", solve the gas exceeding limit problem that gas from being accumulated at corners on coal faces causes; The return airway at fully mechanized coal face rear remains as gob side entry retaining by the present invention, and carry out gob-side entry retaining work, achieve without coal pillar mining, ensure that the coefficient of mining of coal, adopt pier stud to carry out roadside support, improve roadside support intensity, and utilize discarded spoil additional pack wall outside roadside support pier stud, significantly can reduce the pressure of pier stud, prevent erecting dense individual props spoil from producing pier stud and impact, steel mesh reinforcement is sprayed a layer concrete, effectively prevents goaf air leaking.Gob side entry retaining of the present invention and method of ventilation easily implement easy popularization, have good economic worth.
Accompanying drawing explanation
Fig. 1 is the work plane design sketch that have employed fully mechanized coal face gob side entry retaining technique of the present invention and method of ventilation;
Fig. 2 is A-A sectional view in Fig. 1;
Fig. 3 is B-B sectional view in Fig. 1;
In figure, 1-air intake lane, 2-return airway, 3-drawing-off gas lane, 4-gob side entry retaining, 5-immediate roof, 6-base object model, 7-pier stud, 8-hydraulic prop, 9-rectangle breach, 10-anchor pole or anchor cable, 11-working surface hydraulic support, 12-steel mesh reinforcement, 13-pack wall, 14-firm anchor cable, 15-baffle plate, 16-base plate, 17-caved gangue, 18-lumps of wood, 19-top coal, 20-lower curtate working face wall, 21-working face wall.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
A kind of fully mechanized coal face gob side entry retaining technique and method of ventilation, comprise the steps:
Step one: arrange an air intake lane 1 in fully mechanized coal face side, arranges a return airway 2 at fully mechanized coal face opposite side;
Step 2: arrange a drawing-off gas lane 3 in immediate roof 5 or base object model 6, drawing-off gas lane 3 and return airway 2 are arranged in parallel;
Step 3: the return airway 2 at fully mechanized coal face rear is remained as gob side entry retaining 4, and carries out gob-side entry retaining work;
Step 4: after gob-side entry retaining work completes, fresh wind flows into work plane by air intake lane 1 and dilutes face gas, the dirty wind part being mixed with gas flows into return airway 2 and gob side entry retaining 4, another part carries out return air by drawing-off gas lane 3, and then makes air intake lane 1 and return airway 2, gob side entry retaining 4, drawing-off gas lane 3 form " Y+I " type draft type of " enters three times ".
The concrete steps that the return airway at described fully mechanized coal face rear carries out gob side entry retaining are:
Step one: along with the advance of the face, determines the pre-installation position of pier stud 7 in return airway 1, and installs hydraulic prop 8 outside the pre-installation position of pier stud 7, carries out interim strengthening supporting;
Step 2: open a rectangle breach 9 on the rib of tailentry side, and utilize anchor pole or anchor cable 10 to carry out reinforce support;
Step 3: at the rear of working surface hydraulic support 11, utilizes anchor pole or anchor cable 10 to mount steel mesh reinforcement 12;
Step 4: at the goaf side pile spoil bag near steel mesh reinforcement 12, form pack wall 13, wherein spoil bag is filled spoil with the Nylon Bag being of a size of 500 × 250mm and is formed under mine, spoil bag transverse and longitudinal is staggered, pile up in " well " type, can avoid causing pack wall wall crazing because plane of weakness between spoil bag is comparatively large and topples over unstability under the abutment pressure of skewness;
In the middle part of pack wall 13, squeeze into gob floor 16 the firm anchor cable 14 that inclination angle is about 30 ° every 3m along tunnel, anchoring depth in base plate 16 is 2 ~ 4m, coordinate the firm pack wall 13 of baffle plate 15, prevent erecting dense individual props spoil 17 from squeezing the pack wall 13 that collapses, avoid pack wall 13 to collapse to the impact of pier stud 7;
Step 5: spray a layer concrete on steel mesh reinforcement 12, prevent goaf air leaking;
Step 6: adopt artificial lifting or machinery operator to install pier stud 7, be installed on pre-installation position by pier stud 7, and carry on the back tightly with the lumps of wood 18, makes the lumps of wood 18 and top coal 19 rigid contact, pier stud 7 installation;
Step 7: remove hydraulic prop 8;
Step 8: along with the continuation of work plane advances, repeat step one, two, three, four, five, six, seven, until whole working face mining terminates, fully mechanized coal face design sketch as shown in Figure 1, 2, 3.
In the progradation of work plane, drawing-off gas lane 3 can be caving with work plane and destroys, and keeps being communicated with the goaf moment, can discharge high concentration gas pressure relief rapidly and efficiently.
Described drawing-off gas lane 3 is rectangular cross section, and lanewidth is 2 ~ 3m, and lane is high is 2 ~ 3m, is arranged in the work plane caving zone of immediate roof 5 or base object model 6, adopts bolt-mesh-spurting supporting in the tunnel in drawing-off gas lane 3.
Described drawing-off gas lane 3 vertically downward distance top coal 19 is 2 ~ 4m, with return airway 2 horizontal range L be 15 ~ 20m (hypotelorism, the gas leakage of drawing-off gas lane is serious, hypertelorism, termination, tunnel from gas enrichment region too away from, effect is bad).
The installing space of described hydraulic prop 8 is 0.5 ~ 2m.
The length of described rectangle breach 9 is 2 ~ 3m, the width of rectangle breach 9 is equal with the width of pack wall 13, the width of pack wall 13 is 2 ~ 4m, pack wall 13 is 0.2 ~ 0.5m apart from pier stud 7, pier stud 7 is the foam-filled reinforcing bar pier stud of concrete, pier stud diameter is 1 ~ 1.5m, the solid wood that the lumps of wood 18 adopts compressive strength high and homogeneous.
The installing space of described anchor pole or anchor cable 10 is 1 ~ 1.5m, and the length of anchor pole or anchor cable 10 is 2 ~ 10m.
Described steel mesh reinforcement 12 is the welded steel fabric of φ 5mm, and the size of mesh opening of welded mesh is 100 × 100m.
The length of described firm anchor cable 14 is 6 ~ 10m, and the physical dimension of baffle plate 15 is 500 × 500 × 5mm.
Scheme in embodiment is also not used to limit scope of patent protection of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and is all contained in the scope of the claims of this case.
Claims (9)
1. fully mechanized coal face gob side entry retaining technique and a method of ventilation, is characterized in that: comprise the steps:
Step one: arrange an air intake lane in fully mechanized coal face side, arranges a return airway at fully mechanized coal face opposite side;
Step 2: arrange a drawing-off gas lane in immediate roof or base object model, drawing-off gas lane and return airway are arranged in parallel;
Step 3: the return airway at fully mechanized coal face rear is remained as gob side entry retaining, and carry out gob-side entry retaining work;
Step 4: after gob-side entry retaining work completes, fresh wind flows into work plane by air intake lane and dilutes face gas, the dirty wind part being mixed with gas flows into return airway and gob side entry retaining, another part carries out return air by drawing-off gas lane, and then makes air intake lane and return airway, gob side entry retaining, drawing-off gas lane form " Y+I " type draft type of " enters three times ".
2. a kind of fully mechanized coal face gob side entry retaining technique according to claim 1 and method of ventilation, is characterized in that: the concrete steps that the return airway at described fully mechanized coal face rear carries out gob side entry retaining are:
Step one: along with the advance of the face, determines the pre-installation position of pier stud in return airway, and installs hydraulic prop outside the pre-installation position of pier stud, carries out interim strengthening supporting;
Step 2: open a rectangle breach on the rib of tailentry side, and utilize anchor pole or anchor cable to carry out reinforce support;
Step 3: at the rear of working surface hydraulic support, utilizes anchor pole or anchor cable to mount steel mesh reinforcement;
Step 4: at the goaf side pile spoil bag near steel mesh reinforcement, form pack wall, wherein pack wall is anchored on base plate by firm anchor cable and baffle plate, prevents erecting dense individual props spoil from squeezing the pack wall that collapses, avoids pack wall to collapse to the impact of pier stud;
Step 5: spray a layer concrete on steel mesh reinforcement, prevent goaf air leaking;
Step 6: adopt artificial lifting or machinery operator to install pier stud, pier stud is installed on pre-installation position, and tight with the lumps of wood back of the body, make the lumps of wood and top coal rigid contact, pier stud installation;
Step 7: remove hydraulic prop;
Step 8: along with the continuation of work plane advances, repeats step one, two, three, four, five, six, seven, until whole working face mining terminates.
3. a kind of fully mechanized coal face gob side entry retaining technique according to claim 1 and method of ventilation, it is characterized in that: described drawing-off gas lane is rectangular cross section, lanewidth is 2 ~ 3m, lane is high is 2 ~ 3m, be arranged in the work plane caving zone of immediate roof or base object model, in the tunnel in drawing-off gas lane, adopt bolt-mesh-spurting supporting.
4. a kind of fully mechanized coal face gob side entry retaining technique according to claim 1 and method of ventilation, is characterized in that: described drawing-off gas lane vertically downward distance top coal is 2 ~ 4m, is 15 ~ 20m with return airway horizontal range L.
5. a kind of fully mechanized coal face gob side entry retaining technique according to claim 2 and method of ventilation, is characterized in that: the installing space of described hydraulic prop is 0.5 ~ 2m.
6. a kind of fully mechanized coal face gob side entry retaining technique according to claim 2 and method of ventilation, it is characterized in that: the length of described rectangle breach is 2 ~ 3m, the width of rectangle breach is equal with the width of pack wall, the width of pack wall is 2 ~ 4m, pack wall distance pier stud is 0.2 ~ 0.5m, pier stud is the foam-filled reinforcing bar pier stud of concrete, and pier stud diameter is 1 ~ 1.5m, the solid wood that the lumps of wood adopts compressive strength high and homogeneous.
7. a kind of fully mechanized coal face gob side entry retaining technique according to claim 2 and method of ventilation, is characterized in that: the installing space of described anchor pole or anchor cable is 1 ~ 1.5m, and the length of anchor pole or anchor cable is 2 ~ 10m.
8. a kind of fully mechanized coal face gob side entry retaining technique according to claim 2 and method of ventilation, is characterized in that: described steel mesh reinforcement is the welded steel fabric of φ 5mm, the size of mesh opening of welded mesh is 100 × 100m.
9. a kind of fully mechanized coal face gob side entry retaining technique according to claim 2 and method of ventilation, is characterized in that: the length of described firm anchor cable is 6 ~ 10m, and the physical dimension of baffle plate is 500 × 500 × 5mm, and firm anchor cable arranges one every 3m.
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| CN201410471041.9A CN104481568B (en) | 2014-09-15 | 2014-09-15 | A kind of fully mechanized coal face gob side entry retaining technique and method of ventilation |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847387A (en) * | 2015-05-28 | 2015-08-19 | 四川川煤华荣能源股份有限公司大宝顶煤矿 | Construction method of roadside consolidation retained roadway |
| CN104948213A (en) * | 2015-05-11 | 2015-09-30 | 杭州金培科技有限公司 | Gob-side entry retaining method used for remote-control coal mining |
| CN104990831A (en) * | 2015-06-01 | 2015-10-21 | 中国矿业大学 | Experimental platform simulating goaf air leakage and plugging |
| CN105604552A (en) * | 2015-12-21 | 2016-05-25 | 冀中能源集团有限责任公司 | Solid material filling mining gob side entry retaining method |
| CN105956929A (en) * | 2016-05-11 | 2016-09-21 | 中国矿业大学 | Method for determining section size of half coal rock roadway in thin coal seam |
| CN106677804A (en) * | 2017-02-23 | 2017-05-17 | 山东建筑大学 | Gob-side entry retaining roadside support system and construction method thereof |
| CN108049896A (en) * | 2017-12-19 | 2018-05-18 | 河南力行科创矿山技术开发有限公司 | A kind of fully mechanized coal face gob-side entry retaining method |
| CN109098712A (en) * | 2018-08-29 | 2018-12-28 | 中国神华能源股份有限公司 | A kind of construction method of gob side entry retaining |
| CN109252884A (en) * | 2018-09-13 | 2019-01-22 | 辽宁工程技术大学 | A kind of gob side entry retaining working face Y type ventilation anti-disaster method of pressure regulation |
| CN110145363A (en) * | 2019-04-30 | 2019-08-20 | 中国矿业大学(北京) | A kind of Roof Control method realized fully mechanized coal face and be caving filling mining transition |
| CN112412459A (en) * | 2020-12-17 | 2021-02-26 | 贵州大学 | Special strip type filling mining method |
| CN114215592A (en) * | 2021-11-30 | 2022-03-22 | 中国矿业大学 | Green mining method for filling gangue and ultrahigh water material on longwall working face |
| CN114412500A (en) * | 2021-12-13 | 2022-04-29 | 国家能源集团宁夏煤业有限责任公司枣泉煤矿 | Coal face top roof supporting device |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104948213A (en) * | 2015-05-11 | 2015-09-30 | 杭州金培科技有限公司 | Gob-side entry retaining method used for remote-control coal mining |
| CN104847387A (en) * | 2015-05-28 | 2015-08-19 | 四川川煤华荣能源股份有限公司大宝顶煤矿 | Construction method of roadside consolidation retained roadway |
| CN104990831A (en) * | 2015-06-01 | 2015-10-21 | 中国矿业大学 | Experimental platform simulating goaf air leakage and plugging |
| CN105604552A (en) * | 2015-12-21 | 2016-05-25 | 冀中能源集团有限责任公司 | Solid material filling mining gob side entry retaining method |
| CN105956929B (en) * | 2016-05-11 | 2019-04-09 | 中国矿业大学 | A kind of method of determining girdle alternate heading cross dimensions |
| CN105956929A (en) * | 2016-05-11 | 2016-09-21 | 中国矿业大学 | Method for determining section size of half coal rock roadway in thin coal seam |
| CN106677804A (en) * | 2017-02-23 | 2017-05-17 | 山东建筑大学 | Gob-side entry retaining roadside support system and construction method thereof |
| CN108049896A (en) * | 2017-12-19 | 2018-05-18 | 河南力行科创矿山技术开发有限公司 | A kind of fully mechanized coal face gob-side entry retaining method |
| CN109098712A (en) * | 2018-08-29 | 2018-12-28 | 中国神华能源股份有限公司 | A kind of construction method of gob side entry retaining |
| CN109252884A (en) * | 2018-09-13 | 2019-01-22 | 辽宁工程技术大学 | A kind of gob side entry retaining working face Y type ventilation anti-disaster method of pressure regulation |
| CN110145363A (en) * | 2019-04-30 | 2019-08-20 | 中国矿业大学(北京) | A kind of Roof Control method realized fully mechanized coal face and be caving filling mining transition |
| CN110145363B (en) * | 2019-04-30 | 2024-03-29 | 中国矿业大学(北京) | Roof control method for realizing transition from fully mechanized mining face caving to filling mining |
| CN112412459A (en) * | 2020-12-17 | 2021-02-26 | 贵州大学 | Special strip type filling mining method |
| CN112412459B (en) * | 2020-12-17 | 2022-07-12 | 贵州大学 | Special strip type filling mining method |
| CN114215592A (en) * | 2021-11-30 | 2022-03-22 | 中国矿业大学 | Green mining method for filling gangue and ultrahigh water material on longwall working face |
| CN114412500A (en) * | 2021-12-13 | 2022-04-29 | 国家能源集团宁夏煤业有限责任公司枣泉煤矿 | Coal face top roof supporting device |
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