CN110645854A - Pre-splitting blast hole for arranging initial mining hard roof of fully mechanized mining face and online detonating method - Google Patents
Pre-splitting blast hole for arranging initial mining hard roof of fully mechanized mining face and online detonating method Download PDFInfo
- Publication number
- CN110645854A CN110645854A CN201910931128.2A CN201910931128A CN110645854A CN 110645854 A CN110645854 A CN 110645854A CN 201910931128 A CN201910931128 A CN 201910931128A CN 110645854 A CN110645854 A CN 110645854A
- Authority
- CN
- China
- Prior art keywords
- blast
- hole
- mining
- charging
- holes
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
Abstract
The invention discloses a pre-splitting blast hole for arranging a primary mining hard roof of a fully mechanized mining face and a line detonation method, and belongs to the technical field of suspended roof treatment of the mining hard roof of a coal mine. The invention comprises the following steps: the first step is as follows: arranging blast holes in the primary mining incisions; secondly, arranging blast holes in the front lane and the auxiliary lane in advance; the third step: arranging additional blast holes; the fourth step: designing the parameters of charging and sealing the mud in the blast hole, and carrying out online detonation; the fifth step: and (5) reinforcing support of the primary roadway and the secondary roadway. The method has strong field operability, and can save the number of drilled holes, reduce the cost and shorten the construction period on the premise of ensuring the pre-splitting effect of the top plate.
Description
Technical Field
The invention relates to a pre-splitting blast hole for arranging a primary mining hard roof of a fully mechanized mining face and a line detonation method, and belongs to the technical field of suspended roof treatment of the mining hard roof of a coal mine.
Background
Due to the formation period of coal, the stratum activity in the later period and the like, one to a plurality of roof rock strata which are hard, complete and strong in self-supporting capacity exist on a coal seam, and the rock strata often cause that a large area of working face still remains to be exposed and does not collapse after being pushed for a long distance.
As is known, the large-area suspended ceiling in the goaf causes the large step pitch of primary and periodic incoming pressure of a working face, the strong mine pressure of the working face and a stoping roadway to appear, and the dynamic load coefficient of a roof plate to be large; accidents such as the support is crushed and crushed due to the sinking of the top plate step of the working face easily occur in the mining process, and severe impact is caused on the support; hurricanes can be caused when the large-area suspension top plate integrally falls down, the hurricanes can rush to the support, and the safety production of a working face is seriously threatened. Therefore, the hard top plate control is always a worldwide problem which needs to be broken by experts in China.
The deep hole blasting pre-splitting top plate is to artificially pre-fabricate a series of top plate cracks, so that the purpose of reducing the step distance of pressure or fracture is achieved. The core of the technology is the layout scheme of the blast holes, the unreasonable layout can cause insufficient joint cutting effect, and the poor effects of unsatisfactory top plate weakening effect, large explosive loading and the like can be achieved.
Because the top plate belongs to four-side fixed support before caving in the initial mining stage of the working face and is the stage in which the top plate is most difficult to collapse, the forced top-placing of the top plate by blasting in the initial mining stage is extremely necessary, and a good foundation is laid for reducing the periodic pressure step pitch in the later stage. Therefore, how to reasonably arrange the primary mining blast holes, the pre-splitting scheme and the blasting scheme needs further research so as to ensure the blasting and roof-caving effect.
Disclosure of Invention
The invention aims to provide a method for arranging pre-splitting blast holes on a primary mining hard roof of a fully mechanized mining face and detonating an online, which realizes manual forced caving of the hard roof.
The invention provides a method for arranging presplitting blast holes on a primary mining hard roof of a fully mechanized mining face and detonating an online, which comprises the following steps:
the first step is as follows: arranging blast holes in the initial mining incisions
In order to make the working face collapse as early as possible, after the working face hole cutting equipment is installed and a coal cutting knife is operated for 3-4 times, a space (the currently common roller cutting depth is 0.6-1m) of 1.8-4m is generated behind the cut hole, and two rows of blast holes are immediately arranged in the space for construction. But only at both ends, ranging approximately 1/4 degrees the length of the open hole, and requires two rows of blastholes arranged alternately in a three-hole pattern.
The distance between blast holes is 1.5m, the row distance is 0.6-0.8 m (considering the position of a roof anchor rod and can be adjusted in the range), the distance between one row of blast holes close to the goaf side is 0.5-0.7 m from the goaf side (considering the position of the roof anchor rod and can be adjusted in the range), and the two rows of blast holes are alternately arranged. The diameter of the blast hole is determined according to the conditions of a drilling machine, a drilling tool and the like of a mine, but the total length of the blast hole is required to be more than 2 times of the thickness of the hard roof according to the thickness of the hard roof.
Secondly, arranging blast holes in the front and the auxiliary roadways in advance
And arranging a row of blast holes along the axial direction of the front roadway, wherein the distance between the blast holes is about 1.0m, and the distance from the blast holes to the outer wall is determined by considering the position of the roof bolt. The distance between the blast hole closest to the hole cutting and air mining side in the front lane and the hole cutting and air mining side is 1.4-1.6 m.
And arranging a row of blast holes along the axial direction of the front lane and the cutting hole, wherein the distance between the blast holes and the cutting hole goaf side wall is 1.4-1.6m, and the distance between the blast holes is about 0.6 m.
During initial mining, blast holes are continuously arranged from the cut hole end to the front 20-40m of the coal wall of the working face, and then the blast holes are sequentially arranged along with the advancing of the working face.
The arrangement of the blasting holes of the secondary lane is similar to that of the blasting holes of the primary lane.
The third step: arranging and supplementing blast holes
In order to improve the end head pre-splitting effect, a row of blast holes are arranged in the front of the working face coal wall within 3-5 m and perpendicular to the axial direction of the roadway in the primary roadway and the secondary roadway, and specific parameters are determined according to the conditions of the primary roadway and the secondary roadway of the mine.
The fourth step: and designing the parameters of charging and sealing the mud in the blast hole, and carrying out online detonation.
The blast hole charging and sealing parameters comprise the length of a blast hole (more than two times of the thickness of a hard top plate), the elevation angle of the blast hole (preferably 90 degrees), the aperture (generally 35-100mm according to the conditions of a drilling machine), the calculated charging length (which is greater than 1/2 of the length of the blast hole and less than 2/3), the calculated charging amount (calculated according to the depth of a drill hole, the length and the charging length, the charging difficulty is considered, the non-coupling coefficient of charging is set to be 1.2), the calculated sealing length (which is not less than 1/3 of the length of the blast hole and not more than 1/2), the number of charging rolls (the number of the charging rolls is determined according to the specification of the selected rolls and;
blasting by using an initiator, and carrying out batch charging and fractional blasting; one-batch gun line is connected in a mode of local parallel connection and overall series connection, and each time of detonation cannot exceed 10 gun holes at most;
the initiation sequence is from the cut-hole front lane to the auxiliary lane to carry out charging blasting in sequence, then the charging blasting is carried out in sequence from inside to outside in the auxiliary lane, and finally the charging blasting is carried out in sequence from inside to outside in the front lane;
the fifth step: reinforcing support for main lane and auxiliary lane
The support of the main lane and the auxiliary lane is strengthened within the range of 20-40m of the advance working face, 2-3 rows of single pillars are arranged within the range of the main lane and the auxiliary lane, and the distance between the single pillars is about 1 m.
The distance between the working face end support and the advance support is not more than 0.5 m.
The invention has the beneficial effects that:
the method has strong field operability, and can save the number of drilled holes, reduce the cost and shorten the construction period on the premise of ensuring the pre-splitting effect of the top plate.
Drawings
FIG. 1 is a design drawing of a blast hole of a cutting hole and an auxiliary roadway;
FIG. 2 is a design drawing of a hole cutting and main roadway blast hole;
FIG. 3 is a cross-sectional view of an incision A-A;
FIG. 4 is a cross-sectional view of an incision B-B;
FIG. 5 is a C-C section view of the secondary roadway blast hole design;
FIG. 6 is a cross-sectional view of a front roadway blast hole design E-E;
FIG. 7 is a D-D section view of the secondary roadway blast hole design;
FIG. 8 is a F-F section view of a front roadway blast hole design;
FIG. 9 is a schematic view of a pre-fractured blast hole charging configuration;
FIG. 10 is a schematic diagram of a front roadway side blasting sequence;
FIG. 11 is a schematic diagram of a secondary roadway-side blasting sequence;
FIG. 12 is a schematic view of a front roadway advanced reinforcement support;
FIG. 13 is a schematic view of a secondary roadway advanced reinforcement support;
in the figure, 1-incision; 2-secondary lane; 3-inner upper; 4-hydraulic support; 5-a front lane; 6-blast hole; 7-anchor rod; 8-emulsion explosive; 9-electric detonator; 10-water stemming; 11-wet blasting soil; 12-leg line; 13-pi beam. a represents a mining side, b represents a stoping side, c represents a tail, d represents a pre-splitting distance, e represents a head, f represents a main lane, and g represents a secondary lane.
Detailed Description
The invention will be described in further detail with reference to the embodiments of the sequoyite, but the scope of the invention is not limited to these embodiments, and all changes or equivalent substitutions that do not depart from the spirit of the invention are intended to be included within the scope of the invention.
1. The method for arranging the pre-splitting blast holes of the primary mining hard roof of the fully mechanized mining face and detonating the online comprises the following steps of:
the first step is as follows: arranging blast holes in the primary mining incisions.
After the working face hole cutting equipment is installed and the coal cutting is carried out for 3 cutters in a trial mode, a space (the depth of cut of the ore roller is 0.8m) of 2.4m is formed behind the cut hole, and two rows of blast holes are arranged in the space for construction. As shown in fig. 1 and fig. 2, two rows of blast holes are only arranged at two ends, the pre-splitting range of the secondary lane side cutting hole is 50m, the range of the front lane side cutting hole is 60m (the total length of the cutting hole is 240 m), and the two rows of blast holes are alternately arranged in a three-flower-hole mode. The distance between blast holes is 1.5m, and the row spacing is 0.6-0.8 m (considering the position of the roof bolt, the distance can be adjusted in the range). As shown in fig. 3 and 4, the blast holes are perpendicular to the roof, one row of blast holes close to the goaf side is 0.5-0.7 m away from the goaf side (considering the position of the roof anchor rod, the position can be adjusted in the range), and the two rows of blast holes are alternately arranged. According to the conditions of a drilling machine, a drilling tool and the like of a mine, the diameter of a blast hole is determined to be 42mm, the average thickness of the hard roof of the mine is 2.4m, and the total length of the blast hole is determined to be 7m and is more than 2 times of the thickness of the hard roof, namely more than 4.8 m.
The second step is that: arranging blast holes in advance in the main and auxiliary lanes
As shown in fig. 2, a row of blast holes are arranged along the axial direction of the main roadway, the distance between the blast holes is 1.0m, and the distance between the blast holes and the outer wall is 1.0-1.2 m (considering the position of the roof bolt, the position can be adjusted within the range). The distance between the blast hole closest to the hole cutting and air mining side in the front lane and the hole cutting and air mining side is 1.5 m.
And a row of blast holes are arranged behind the front lane support in the direction parallel to the axial direction of the cut hole, the distance between the blast holes and the cut hole goaf side wall is 1.5m, and the distance between the blast holes is 0.6 m.
As shown in fig. 2-8, blast holes are arranged continuously from the cut end to the front 30m of the coal wall of the working face during initial mining, and then are arranged in sequence as the working face advances.
The arrangement of blasting holes in the auxiliary lane is similar to that in the main lane, but the distance between the blasting holes and the outer wall needs to be adjusted according to ventilation facilities.
The third step: arranging and supplementing blast holes
In order to improve the end head pre-splitting effect, a row of blast holes are arranged in the front of the working face coal wall in the primary roadway and the secondary roadway within a range of 3-5 m and perpendicular to the axial direction of the roadway. The parameters of the West Qu mine replenishing blast holes are as follows:
as shown in fig. 5 and 6, a plurality of blast holes are added in the auxiliary roadway and are uniformly distributed, and the distance between the blast holes close to the inner wall and the inner wall is 0.5m and 700 mm. And a plurality of blast holes are added in the front roadway and are uniformly distributed, and the distance between the blast holes close to the inner wall and the inner wall is 0.3m and 800 mm.
The fourth step: designing the parameters of charging and sealing mud in blast hole, and detonating in line
The diameter of a blast hole is 42mm, the explosive is three-grade coal mine allowable emulsion explosive, the specification of a cartridge is phi 35 multiplied by 200mm, 200 g/cartridge, and the radial explosive charging decoupling coefficient is 1.2. A single borehole charge is shown in figure 9. Firstly, the emulsion explosive 8 is installed, then the electric detonator 9 is installed, and then the water stemming 10, the wet blasting soil 11 and the foot line 12 are installed.
18403 the working face is provided with 241 blast holes, the depth of the blast holes is 7m, and the blast holes are all vertical to the top plate. The total length of the construction blast hole is 1687 m. Wherein: and calculating the charge length of 5m and the mud sealing length of 2m for each blast hole.
The blast hole parameters and the charge amount are shown in Table 1-1.
TABLE 1-1 working face end head top plate weakening treatment blast hole parameter and calculated charge Meter
The working face blast hole drilling machine is initially constructed by adopting a jumbolter (the existing drilling machine on the mine can be used, and blast holes can be completed no matter what type). 1 PN-A type stemming machine, with stemming specification of phi 35mm multiplied by 200m, made of sand and loess. The explosive used for blasting the working face is three-level coal mine permitted emulsion explosive, the specification of the explosive cartridge is phi 35 multiplied by 200mm and 200 g/cartridge, and the detonator is a coal mine permitted 8# common instantaneous power generation detonator (or the same-section position). The equipment and initiating explosive devices required for blasting are summarized in Table 2-1.
TABLE 2-1 summary of initiating explosive devices required for pre-splitting blasting of top plate for initial mining
And (4) blasting by using an FD-200Z type detonator, and carrying out grouped charging and fractional blasting. One shot is connected in a line in a mode of local parallel connection and overall series connection, and at most, 10 blast holes cannot be exceeded during each time of detonation.
The initiation sequence is from the front lane to the secondary lane, then the secondary lane, and finally the front lane.
The initiation sequence is shown in fig. 10 and 11, and specifically includes:
(1) the method adopts the steps of charging in groups and blasting in multiple times. The primary blasting is carried out in a mode of local parallel connection and overall series connection.
(2) Before charging, the blast hole must be checked, and when the blast hole is deformed, charging is not carried out.
(3) The single-hole loading was tentatively 5 kg. On-site single-hole loading can be adjusted according to on-site actual conditions, and when the roof is hard and the roof-caving effect is not good, the loading can be increased under the condition that the length of the sealing mud is not less than 1.5 m.
(4) The number of blast holes for each time of initiation is temporarily not more than 10, and the number can be adjusted according to the actual situation on site, but the total explosive amount for each time of initiation is not more than 80 kg.
(5) The charged blast holes in shift must complete blasting in shift.
(6) The construction is carried out according to the arrangement diagram of blast holes and corresponding standards, and the painting marking can be carried out in advance on site.
The fifth step: reinforcing support for main lane and auxiliary lane
The front working face is 30m ahead to strengthen the support of the main lane and the auxiliary lane. As shown in fig. 12 and 13, 3 rows of single pillars are arranged within 30m of the working face in the main lane and the sub lane, and the pillar distance is 1m between the single pillars.
As shown in fig. 12, the first row in the front lane is 800mm away from the working face coal side, the second row is 800mm away from the first row, the third row is 800mm away from the safety side, and the pillar is provided with a pi-shaped beam 13. The main lane is influenced by equipment, the row spacing between the single bodies can be properly adjusted according to the field condition of the equipment, but the supporting quality and the supporting quantity must be ensured.
As shown in fig. 13, the first row in the sublevel is 800mm away from the sublevel, the second row is 800mm away from the first row, the third row is 800mm away from the working face coal side, and the pillar is provided with a pi-shaped beam 13.
The distance between the working face end support and the advance support is 0.3 m.
The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method for arranging presplitting blast holes on a primary mining hard roof of a fully mechanized mining face and detonating an online is characterized by comprising the following steps:
the first step is as follows: arranging blast holes in the initial mining incisions
In order to cause the top plate of the working face to collapse as early as possible, after the working face hole cutting equipment is installed and coal cutting is tried for 3-4 cutters, a space of 1.8-4m is generated behind the cut hole, and two rows of blast holes are arranged in the space for construction; the blast holes are only arranged at two ends;
secondly, arranging blast holes in the front and the auxiliary roadways in advance
Arranging a row of blast holes along the axial direction of the main roadway;
arranging a row of blast holes along the axial direction of the main roadway and the cutting hole;
arranging blast holes continuously from the cut hole end to the front 20-40m of the coal wall of the working face during the initial mining period, and then arranging the blast holes in sequence along with the advancing of the working face;
the arrangement of blasting holes of the auxiliary lane is the same as that of the main lane;
the third step: arranging and supplementing blast holes
In order to improve the end head pre-splitting effect, a row of blast holes are arranged in the front of the working face coal wall within 3-5 m and perpendicular to the axial direction of the roadway in the primary roadway and the secondary roadway, and the parameters of the blast holes are determined according to the conditions of the primary roadway and the secondary roadway of the mine;
the fourth step: designing blast hole, charging and sealing parameters, and detonating on line
The blast hole, charging and mud sealing parameters comprise blast hole length, blast hole elevation angle, aperture, charging length calculation, charging amount calculation, mud sealing length calculation and charging coil number;
blasting by using an initiator, and carrying out batch charging and fractional blasting; one-batch gun line is connected in a mode of local parallel connection and overall series connection, and each time of detonation cannot exceed 10 gun holes at most;
the initiation sequence is from the cut-hole front lane to the auxiliary lane to carry out charging blasting in sequence, then the charging blasting is carried out in sequence from inside to outside in the auxiliary lane, and finally the charging blasting is carried out in sequence from inside to outside in the front lane;
the fifth step: reinforcing support for main lane and auxiliary lane
And (3) strengthening the support of the primary roadway and the secondary roadway within the range of 20-40m of the advance working surface, and arranging single pillars within the range of the primary roadway and the secondary roadway.
2. The fully mechanized mining face primary mining hard roof arrangement pre-splitting blast hole and online detonating method according to claim 1, characterized in that: in the first step, pre-splitting blasting is carried out on the two ends of the open-off cut and the advance range of the two roadways by 30m in the initial mining stage of the working face, wherein the pre-splitting ranges behind the open-off cut are 1/4 of the length of the open-off cut, but 1/2 of the pre-splitting ranges in the middle of the open-off cut are not blasted, and two rows of blast holes are required to be alternately arranged in a three-hole mode.
3. The fully mechanized mining face primary mining hard roof arrangement pre-splitting blast hole and online detonating method according to claim 1, characterized in that: in the first step, the distance between blast holes is 1.5m, the row distance is 0.6-0.8 m, one row of blast holes close to the mining side is 0.5-0.7 m away from the mining side wall, and two rows of blast holes are alternately arranged; the diameter of the blast hole is 35-100mm, and the total length of the blast hole is more than 2 times of the thickness of the hard top plate.
4. The fully mechanized mining face primary mining hard roof arrangement pre-splitting blast hole and online detonating method according to claim 1, characterized in that: in the second step, a row of blast holes are required to be respectively arranged along the axial direction of the front lane and the cutting hole, the distance between the blast holes along the axial direction of the front lane is 1.0m, the distance between the blast hole closest to the cutting hole mining side in the front lane is 1.4-1.6m from the cutting hole mining side wall, the distance between the blast holes along the axial direction of the front lane and the cutting hole is 1.4-1.6m from the cutting hole mining side wall, and the distance between the blast holes is 0.6 m.
5. The fully mechanized mining face primary mining hard roof arrangement pre-splitting blast hole and online detonating method according to claim 1, characterized in that: in the fourth step, the explosive is required to be loaded in groups and exploded in multiple times; and the connection of one batch of cannons is required to be carried out in a mode of local parallel connection and overall series connection, and each time of detonation cannot exceed 10 cannon holes at most.
6. The fully mechanized mining face primary mining hard roof arrangement pre-splitting blast hole and online detonating method according to claim 1, characterized in that: in the fourth step, the length of the blast hole exceeds twice the thickness of the hard top plate, the elevation angle of the blast hole is 90 degrees, the aperture is 35-100mm, the calculated charging length is greater than 1/2 of the length of the blast hole and less than 2/3 of the length of the blast hole, the charging amount is calculated according to the depth of the drilled hole, the length of the drilled hole and the charging length, the sealing length is not less than 1/3 of the length of the blast hole and not more than 1/2, and the number of the charging rolls is determined according to the specification of the selectively purchased cartridges and the calculated charging amount.
7. The fully mechanized mining face primary mining hard roof arrangement pre-splitting blast hole and online detonating method according to claim 1, characterized in that: and in the fourth step, the detonation sequence is sequentially charged and blasted from the front lane to the auxiliary lane of the cutting hole, then the charging and blasting are sequentially performed from inside to outside in the auxiliary lane, and finally the charging and blasting are sequentially performed from inside to outside in the front lane.
8. The fully mechanized mining face primary mining hard roof arrangement pre-splitting blast hole and online detonating method according to claim 1, characterized in that: and in the fifth step, 2-3 rows of single supports are arranged in the main roadway and the auxiliary roadway for reinforcing support, the distance between every two single supports is 1m, and the distance between a working face end support and an advance support is required to be not more than 0.5 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910931128.2A CN110645854B (en) | 2019-09-29 | 2019-09-29 | Pre-splitting blast hole for arranging initial mining hard roof of fully mechanized mining face and online detonating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910931128.2A CN110645854B (en) | 2019-09-29 | 2019-09-29 | Pre-splitting blast hole for arranging initial mining hard roof of fully mechanized mining face and online detonating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110645854A true CN110645854A (en) | 2020-01-03 |
| CN110645854B CN110645854B (en) | 2022-03-04 |
Family
ID=68993073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910931128.2A Active CN110645854B (en) | 2019-09-29 | 2019-09-29 | Pre-splitting blast hole for arranging initial mining hard roof of fully mechanized mining face and online detonating method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110645854B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2283431C1 (en) * | 2005-04-28 | 2006-09-10 | Государственное образовательное учреждение высшего профессионального образования СИБИРСКИЙ ГОСУДАРСТВЕННЫЙ ИНДУСТРИАЛЬНЫЙ УНИВЕРСИТЕТ | Method for thick steep mineral seam mining along with goaf filling |
| CN106247876A (en) * | 2016-10-13 | 2016-12-21 | 太原理工大学 | High working face cuts greatly a blasting method for fully-mechanized mining working tight roof overhead caving |
| CN207063903U (en) * | 2017-08-04 | 2018-03-02 | 四川省华蓥山煤业股份有限公司绿水洞煤矿 | Cloth pore structure is administered on the outstanding top of high-dipping fully-mechanized mining working upper corner |
| CN108252651A (en) * | 2018-01-12 | 2018-07-06 | 新疆龟兹矿业有限公司 | The method of fully-mechanized mining working multi-point dispersion run-in index borehole presplitting top plate |
| CN110206542A (en) * | 2019-04-16 | 2019-09-06 | 中国矿业大学(北京) | Suitable for mining in combined mining thick coal seam Sub-Level Caving without coal column self-contained lane recovery method |
-
2019
- 2019-09-29 CN CN201910931128.2A patent/CN110645854B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2283431C1 (en) * | 2005-04-28 | 2006-09-10 | Государственное образовательное учреждение высшего профессионального образования СИБИРСКИЙ ГОСУДАРСТВЕННЫЙ ИНДУСТРИАЛЬНЫЙ УНИВЕРСИТЕТ | Method for thick steep mineral seam mining along with goaf filling |
| CN106247876A (en) * | 2016-10-13 | 2016-12-21 | 太原理工大学 | High working face cuts greatly a blasting method for fully-mechanized mining working tight roof overhead caving |
| CN207063903U (en) * | 2017-08-04 | 2018-03-02 | 四川省华蓥山煤业股份有限公司绿水洞煤矿 | Cloth pore structure is administered on the outstanding top of high-dipping fully-mechanized mining working upper corner |
| CN108252651A (en) * | 2018-01-12 | 2018-07-06 | 新疆龟兹矿业有限公司 | The method of fully-mechanized mining working multi-point dispersion run-in index borehole presplitting top plate |
| CN110206542A (en) * | 2019-04-16 | 2019-09-06 | 中国矿业大学(北京) | Suitable for mining in combined mining thick coal seam Sub-Level Caving without coal column self-contained lane recovery method |
Non-Patent Citations (1)
| Title |
|---|
| 要华伟: "综放（采九放八）工作面安全初采技术研究", 《山西煤炭》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110645854B (en) | 2022-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102587916B (en) | A kind of ore caving afterwards filling mining methods | |
| CN113390308B (en) | Composite cut blasting structure and cut method thereof | |
| CN101441055A (en) | Presplit blasting method | |
| CN105952450B (en) | A kind of new method of the double stope collaboration exploitations in underground mine underground | |
| CN113154974B (en) | Tunnel roof pressing smooth blasting method | |
| CN110043269B (en) | Excavation construction process for tunnel body of highway tunnel | |
| CN101876520A (en) | Segment pre-blasting technology for steeply dipping hard coal seam roof | |
| CN110307762B (en) | Quick well forming method for courtyard based on deep hole-by-hole detonation technology | |
| CN111502662A (en) | Prevention and control method for deep pressure relief shallow part reinforcement of rock burst mine advanced coal body | |
| CN111043924B (en) | Efficient blasting method for blocking stemming of tunnel soft rock full-section multistage ultra-deep hole double-end stemming | |
| CN104929641A (en) | Treatment method applied to disaster of steeply dipping seam roof | |
| CN101539020A (en) | Upward layered mining method | |
| CN105569693A (en) | Underground stable rock stratum large-scale chamber construction method applied to medium-length hole blasting | |
| CN113686215A (en) | Rock roadway large-diameter double-hole charging accurate time-delay hole-by-hole vertical cut blasting method | |
| CN103233739A (en) | Mining method for thick and large ore pillar under filling body package | |
| CN212154765U (en) | Deep hole pre-splitting structure for fully mechanized mining face waste rock area | |
| CN110645854B (en) | Pre-splitting blast hole for arranging initial mining hard roof of fully mechanized mining face and online detonating method | |
| CN114935290B (en) | Pre-splitting blasting method for cutting single roadway and cutting deep hole on two sides of top-cutting retained roadway | |
| CN110671979A (en) | Controlled blasting method for forming cutting well by deep hole extrusion blasting | |
| CN110196002A (en) | A kind of safe and efficient blasting construction method of shaft wall hitch | |
| CN112964143B (en) | Three-time blasting method for hollow hole straight-hole cut | |
| CN104879128A (en) | Steep-dip ultra-thick coalbed mining technique based on top-coal advancing pre-detonation weakening | |
| CN113883978A (en) | Tunnel reserved contour protection rock curtain water pressure energy-gathering smooth blasting method | |
| CN112729029A (en) | Smooth blasting method for soft rock roadway | |
| CN112211639A (en) | One-step well completion method for high-depth large-section medium-deep hole |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |