CN115306388A - Medium-length hole access filling mining method - Google Patents
Medium-length hole access filling mining method Download PDFInfo
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- CN115306388A CN115306388A CN202211080395.1A CN202211080395A CN115306388A CN 115306388 A CN115306388 A CN 115306388A CN 202211080395 A CN202211080395 A CN 202211080395A CN 115306388 A CN115306388 A CN 115306388A
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- length hole
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- 238000005065 mining Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005422 blasting Methods 0.000 claims abstract description 39
- 239000011435 rock Substances 0.000 claims abstract description 32
- 238000005553 drilling Methods 0.000 claims abstract description 22
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 238000011084 recovery Methods 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 230000000977 initiatory effect Effects 0.000 claims description 34
- 239000002360 explosive Substances 0.000 claims description 23
- 238000010276 construction Methods 0.000 claims description 7
- 238000004880 explosion Methods 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 3
- 238000005474 detonation Methods 0.000 claims description 3
- 238000005429 filling process Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a medium-length hole approach filling mining method, which belongs to the technical field of mining and comprises the steps of constructing an upper-layer rock drilling combined roadway and a lower-layer ore removal combined roadway, taking two layers as a mining unit, firstly mining the upper layer, constructing by adopting a drilling and blasting method during the mining of the upper layer, and adopting a full-section anchor net spraying support mode; when the upper-layer rock drilling approach is constructed to the designed position, constructing a cutting groove by adopting a drilling and blasting method; after the cutting groove is constructed, constructing a vertical hole, and after the whole route is filled, constructing the next route according to the mining sequence; filling after the two-layered recovery is finished; after all the upper and lower layers are completely stoped and filled, the layers are lifted to the upper and lower layers. According to the invention, the medium-length hole access filling mining is adopted aiming at the conditions that the rock is stable and not supported and the rock condition is poor, the mining and filling process is simple, the production efficiency is high, the targeted blasting is carried out according to the structures on two sides of the medium-length hole access, and the adaptability to ore bodies is wide.
Description
Technical Field
The invention relates to the technical field of mining, and discloses a filling mining method, in particular to a medium-length hole access filling mining method.
Background
The upward access filling method is characterized in that two layers are used as a stoping unit, the upper layer is stoped firstly, the anchor net is adopted to spray and reinforce the top plate, then the lower layer is stoped, filling is carried out after stoping of the two layers is finished, and stope blasting is carried out by taking the access of the top layer as a free surface.
Although the common sublevel access filling mining method avoids the mode that rock drilling and blasting operators work in the environment with a large exposed area of the top plate, if the rock is stable and not supported and the condition of the rock is poor, the top plate of the stope after blasting is extremely uneven, the phenomenon of hanging over dangerous rocks is common, the operation of knocking the side and asking the top is difficult to carry out, and the potential safety hazard is formed for the subsequent operation.
Disclosure of Invention
The invention provides a medium-length hole access filling mining method in order to overcome at least one of the defects. The purpose of the invention can be achieved by adopting the following technical scheme:
a medium-length hole access filling mining method specifically comprises the following steps:
a) Firstly constructing an upper-layer rock drilling combined roadway and a lower-layer ore removal combined roadway, taking two layers as a recovery unit, firstly mining the upper layer, constructing the upper layer by adopting a drilling and blasting method during mining of the upper layer, and adopting a full-section anchor net spraying support form as a support form;
b) When the upper-layer rock drilling approach is constructed to the designed position, constructing a cutting groove by adopting a drilling and blasting method;
c) After the construction of the cutting groove is finished, constructing a vertical hole, and after the filling of the whole approach is finished, performing the construction of the next approach according to the mining sequence;
d) Filling after the two-layered mining is finished;
f) After all the upper and lower layers of the stope are completely stoped and filled, the stope is lifted to the upper and lower layers, and the construction process is consistent with that of the lower layer.
Preferably, the medium-length hole cutting groove adopts a detonating network formed by connecting a detonating cord and a detonating tube in parallel.
Preferably, the medium-length hole cutting groove adopts a explosive charging structure initiated by a detonating cord.
Preferably, each hole of the main blasting hole is detonated by two detonating tubes, and finally the detonating cord of the side hole is detonated by the detonating tubes
Preferably, when the two sides of the medium-length hole approach are the original rocks, medium-length hole presplitting blasting is adopted, positive-row blasting is adopted, the explosive charging structure is formed by double-priming explosive-bag blasting, and the line connection mode is series-parallel connection.
Preferably, when the medium-length hole is blasted in a row hole mode, the blasting edge holes are superior to other blast holes in blasting initiation each time.
Preferably, the side holes are 300mm away from the side wall, the angle is 87 degrees, the lower openings of the blast holes are arranged on the route contour line, and the distance between the side holes is 800mm.
Preferably, when the filling body and the original rock are respectively arranged on two sides of the medium-length hole access way, L-shaped detonation of the medium-length hole is adopted, and presplitting blasting of the medium-length hole is adopted.
Preferably, one side of the original rock is subjected to presplitting initiation firstly, one side of the filling body is subjected to delayed initiation, the charging structure is formed by initiating with double initiating explosive packages, and the connection mode is series-parallel connection.
Preferably, when both sides of the medium-length hole access are filling bodies, medium-length hole V-shaped initiation is adopted, the explosive charging structure is double-initiation explosive bag initiation, and the connection mode is series-parallel connection.
The invention has the beneficial technical effects that: according to the disclosure, the medium-length hole access filling mining method adopts medium-length hole access filling mining aiming at the conditions that rocks are stable and not supported and the rock conditions are poor, the mining and filling process is simple, the production efficiency is high, targeted blasting is performed according to the structures on two sides of the medium-length hole access, and the adaptability to ore bodies is wide.
Drawings
In the drawings, the following are given by way of example and without limitation:
fig. 1 shows a front view of a mine room plan for deep hole cut and fill mining in an embodiment of the invention;
FIG. 2 shows a plan view of a chamber of deep hole cut and fill mining in an embodiment of the invention;
FIG. 3 shows a top view of a medium-length hole chamber blasthole arrangement of an embodiment of the invention;
FIG. 4 shows a front view of a medium-length hole chamber blasthole arrangement of an embodiment of the invention;
FIG. 5 shows a schematic diagram of a detonation network of an embodiment of the invention;
FIG. 6 shows a schematic of the charge configuration of hole g of FIG. 5 of the present invention;
FIG. 7 shows a schematic of the charge configuration of holes h, i, j and k of FIG. 5 of the present invention;
FIG. 8 shows a schematic diagram of a middle-deep hole route waist-pack initiation line with a filling body and a raw rock on two sides respectively according to an embodiment of the invention;
fig. 9 shows a schematic diagram of a medium-length hole access waist pack initiation line with filling bodies on two sides according to an embodiment of the invention.
In the figure: the method comprises the following steps of 1, 2, a cutting groove, 3, a mine boundary, 4, a blasting pile, 5, an anchor rod, 6, a rock drilling roadway, 7, a blast hole, 8, a raw rock, 11, 12, a rock drilling roadway, 13, a mine room, 21, an explosion fuse and 22, wherein the blasting pile is used as a blasting hole.
Detailed Description
In the following detailed disclosure, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced, and in which, in order to make the technical aspects of the invention more clear and apparent to those skilled in the art, the embodiments described below are not limited thereto, but the invention will be described in further detail with reference to the examples and drawings.
As shown in fig. 1-2, the medium-length hole access filling method is to construct an upper-layer rock drilling combined roadway and a lower-layer ore removal combined roadway at first, and to take the two layers as a mining unit, wherein the upper layer is mined firstly, the upper layer is constructed by a drilling and blasting method during mining, and the supporting mode is full-section anchor net spraying supporting. And when the upper-layer rock drilling approach is constructed to the designed position, constructing the cutting groove. And constructing the cutting groove by adopting a drilling and blasting method, after the construction of the cutting groove is finished, constructing a vertical hole by using an SDM90TS rock drilling trolley, and after the whole route is filled, performing the next route construction according to the mining sequence. Filling after the two-layered recovery is finished; after all the upper and lower layers of the stope are completely stoped and filled, the stope is lifted to the upper two layers, and the construction process is the same as that of the lower layer.
In the embodiment, according to the requirement of mining design, the upper layer of a one-step mining access of the common access filling mining method adopts the specification of 6.0mx3.5m, the lower layer adopts the specification of 6mx4m, the upper layer of the two-part mining access adopts the specification of 5.0 mx3.5m, and the lower layer adopts the specification of 5mx4 m. The upper layer of one-step mining route of the medium-length hole filling mining method adopts the specification of 6.0mx3.5m, the lower layer adopts the specification of 6mx7m, the upper layer of the two-part mining route adopts the specification of 5.0 mx3.5m, and the lower layer adopts the specification of 5x7 m.
The blast holes are arranged according to the lithological condition of the working face, and the parameters such as the number of the blast holes, the depth of the blast holes, the angle and the like are reasonably arranged. Emulsion explosive is used for blasting, and a detonating primer is selected for blasting.
The SDM90TS rock drilling trolley is used for medium-length holes, and the SDM90TS rock drilling trolley is matched with a phi 38 mm hollow six-edge steel drill and a phi 45 mm alloy drill bit.
The medium-length hole cutting groove adopts an initiation network formed by connecting an initiation cable and an initiation tube in parallel, the number of optical explosion holes is large, the initiation network is disordered by connecting the initiation tube with the initiation tube, leakage connection or infirm connection is easy to generate, a plastic tube is easy to damage, explosion rejection is generated, and the like, so that the explosive charging structure for initiating the initiation of the initiation cable is adopted, the safety of the initiation network of the initiation cable is good, the operation is simple, and the long-distance explosion propagation is stable. And (3) detonating each hole of the main detonating hole by adopting two detonating tubes, and finally detonating the detonating fuse of the side hole by using the detonating tubes.
As shown in fig. 3-5, stable surrounding rocks are arranged on two sides, the medium-length hole access adopts medium-length hole presplitting blasting and positive-row blasting, the charging structure adopts double-priming-cartridge blasting, and the line connection mode is series-parallel connection. When the medium-length hole is lined with holes for blasting, blasting side holes (pre-split holes) at each time is superior to other blast holes for blasting, the distance between each side hole and a side wall is 300mm, the angle is 87 degrees, the lower opening of each blast hole is on an approach contour line, the distance between the side holes is 800mm, non-coupling explosive charging is adopted, the explosive charging amount is 400g/m, explosive cartridges are dispersedly bound on a detonating cord, the adjacent distance between the dispersed explosive cartridges is 500mm, the clamping effect of the hole bottom is large, the explosive cartridge at the bottom is reinforced, and 4 explosive cartridges are placed at the bottom.
As shown in figure 6, the depth of the hole g is 6.5m, the length of the detonating cord is 7m, 15 explosive charges are filled in the whole hole, 2 explosive cartridges with diameter of 32 are filled in each meter, and 4 explosive cartridges with diameter of 32 are filled in the bottom 1m of the hole. As shown in FIG. 7, the depth of the holes h, i, j and k is 6.5m, the hole bottom is 1m filled with 3 cartridges with diameter of 32 mm, the hole bottom is 2m filled with a detonating cartridge composed of a detonating tube detonator and a cartridge, the hole top is blocked at 0-1.2 m, the hole top is 2.2m filled with a detonating cartridge composed of a detonating tube detonator and a cartridge, and ammonium nitrate fuel oil explosive is arranged between the two detonating cartridges.
The medium-length hole blasting parameters are as follows:
as shown in fig. 8, one side is a filling body, the other side is stable surrounding rock, the medium-length hole access adopts medium-length hole L-shaped initiation, medium-length hole presplitting blasting is adopted, presplitting initiation is firstly carried out on one side of the original rock, delayed initiation is carried out on one side of the filling body, the charging structure is dual-initiation explosive-charge initiation, and the connection mode is series-parallel connection.
As shown in figure 9, the two sides are provided with filling bodies, the medium-length hole access is initiated in a V shape by adopting a medium-length hole, the charging structure is initiated by double initiating explosive packages, and the connection mode is series-parallel connection.
These and other changes can be made to the embodiments in light of the above detailed description, this written description including examples of the best mode to disclose the invention. The scope of the invention is defined by the appended claims, and not by the description of the invention, which is not to be limited thereto, and any person skilled in the art can, within the scope of the invention disclosed, substitute or modify the technical solutions and concepts of the present invention, all of which are within the scope of the invention.
Claims (10)
1. A medium-length hole access filling mining method is characterized by comprising the following steps:
a) Firstly constructing an upper-layer rock drilling combined roadway and a lower-layer ore removal combined roadway, taking two layers as a recovery unit, firstly mining the upper layer, constructing the upper layer by adopting a drilling and blasting method during mining of the upper layer, and adopting a full-section anchor net spraying support form as a support form;
b) When the upper-layer rock drilling approach is constructed to the designed position, constructing a cutting groove by adopting a drilling and blasting method;
c) After the cutting groove is constructed, constructing a vertical hole, and after the whole route is filled, constructing the next route according to the mining sequence;
d) Filling after the two-layered recovery is finished;
f) After all the upper and lower layers of the stope are completely stoped and filled, the stope is lifted to the upper and lower layers, and the construction process is consistent with that of the lower layer.
2. The medium-length hole access filling mining method according to claim 1, characterized in that the medium-length hole cutting groove adopts an initiation network with an initiation cord and an initiation tube connected in parallel.
3. The medium-length hole access filling mining method according to claim 1, characterized in that the medium-length hole cutting groove adopts a explosive charge structure initiated by an explosion wire.
4. The medium-length hole access cut-and-fill mining method of claim 3, wherein two detonating tubes are used for each hole of the main detonating hole, and finally the side hole detonating cords are initiated with the detonating tubes.
5. The medium-length hole access filling mining method according to claim 1, characterized in that medium-length hole presplitting blasting is adopted when the two sides of the medium-length hole access are the original rocks, positive-row blasting is adopted, the charging structure is double-detonating-cartridge blasting, and the line connection mode is series-parallel connection.
6. The medium-length hole access filling mining method according to claim 5, characterized in that during medium-length hole array blasting, blasting edge holes are initiated better than other blast holes each time.
7. The medium-length hole access cut-and-fill mining method according to claim 6, wherein the side holes are 300mm away from the highwall, the angle is 87 degrees, the blasthole entrances are on the access contour line, and the distance between the side holes is 800mm.
8. The medium-length hole access filling mining method according to claim 1, characterized in that when filling bodies and original rocks are respectively arranged on two sides of the medium-length hole access, L-shaped detonation of a medium-length hole is adopted, and presplitting blasting of the medium-length hole is adopted.
9. The medium-length hole access filling mining method according to claim 8, characterized in that one side of the original rock is subjected to presplitting initiation firstly, one side of the filling body is subjected to delayed initiation, the explosive charging structure is the initiation of double initiating explosive charges, and the connection mode is series-parallel connection.
10. The medium-length hole access filling mining method according to claim 1, characterized in that when both sides of the medium-length hole access are filling bodies, medium-length hole V-shaped initiation is adopted, the explosive charging structure is double-initiation explosive bag initiation, and the connection mode is series-parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211080395.1A CN115306388A (en) | 2022-09-05 | 2022-09-05 | Medium-length hole access filling mining method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211080395.1A CN115306388A (en) | 2022-09-05 | 2022-09-05 | Medium-length hole access filling mining method |
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| CN115306388A true CN115306388A (en) | 2022-11-08 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251773A (en) * | 2011-06-22 | 2011-11-23 | 大冶有色金属股份有限公司 | Route type upward horizontal layered filling mining method suitable for extremely complex ore body mining |
| CN102518438A (en) * | 2012-01-06 | 2012-06-27 | 中南大学 | Roof regeneration medium-length hole ore blast backfill mining method |
| CN102808622A (en) * | 2012-08-03 | 2012-12-05 | 西北矿冶研究院 | Method for recovering ore pillar by medium-length hole and deep hole combined blasting technology |
| CN103206215A (en) * | 2013-04-11 | 2013-07-17 | 中南大学 | Precontrol top upward access cut-and-filling stopping method |
| CN103982183A (en) * | 2014-05-23 | 2014-08-13 | 山东黄金矿业(莱州)有限公司三山岛金矿 | Method for recovering broken ore body by access sub-step roof popping |
| CN109236295A (en) * | 2018-11-14 | 2019-01-18 | 中南大学 | A kind of three step stoping methods suitable for Deep Thick large ore deposit |
| RU2693806C1 (en) * | 2018-11-19 | 2019-07-04 | Федеральное государственное бюджетное учреждение науки Институт горного дела Уральского отделения Российской академии наук (ИГД УрО РАН) | Method of driving mine workings |
| CN111005721A (en) * | 2019-11-25 | 2020-04-14 | 南华大学 | Mining method of steeply inclined medium-thickness ore body |
| CN111550244A (en) * | 2020-05-11 | 2020-08-18 | 武汉理工大学 | Mining method for layered strips of gently inclined ore body |
| CN113154973A (en) * | 2021-05-07 | 2021-07-23 | 中国华冶科工集团有限公司 | Mining blasting method |
-
2022
- 2022-09-05 CN CN202211080395.1A patent/CN115306388A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251773A (en) * | 2011-06-22 | 2011-11-23 | 大冶有色金属股份有限公司 | Route type upward horizontal layered filling mining method suitable for extremely complex ore body mining |
| CN102518438A (en) * | 2012-01-06 | 2012-06-27 | 中南大学 | Roof regeneration medium-length hole ore blast backfill mining method |
| CN102808622A (en) * | 2012-08-03 | 2012-12-05 | 西北矿冶研究院 | Method for recovering ore pillar by medium-length hole and deep hole combined blasting technology |
| CN103206215A (en) * | 2013-04-11 | 2013-07-17 | 中南大学 | Precontrol top upward access cut-and-filling stopping method |
| CN103982183A (en) * | 2014-05-23 | 2014-08-13 | 山东黄金矿业(莱州)有限公司三山岛金矿 | Method for recovering broken ore body by access sub-step roof popping |
| CN109236295A (en) * | 2018-11-14 | 2019-01-18 | 中南大学 | A kind of three step stoping methods suitable for Deep Thick large ore deposit |
| RU2693806C1 (en) * | 2018-11-19 | 2019-07-04 | Федеральное государственное бюджетное учреждение науки Институт горного дела Уральского отделения Российской академии наук (ИГД УрО РАН) | Method of driving mine workings |
| CN111005721A (en) * | 2019-11-25 | 2020-04-14 | 南华大学 | Mining method of steeply inclined medium-thickness ore body |
| CN111550244A (en) * | 2020-05-11 | 2020-08-18 | 武汉理工大学 | Mining method for layered strips of gently inclined ore body |
| CN113154973A (en) * | 2021-05-07 | 2021-07-23 | 中国华冶科工集团有限公司 | Mining blasting method |
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