CN102230768A - High-efficiency inclined shaft tunneling blasting method for red clay - Google Patents
High-efficiency inclined shaft tunneling blasting method for red clay Download PDFInfo
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Abstract
The invention relates to a high-efficiency inclined shaft tunneling blasting method for red clay. The method is characterized in that: a. arranging a couple of central holes (1) on the longitudinal middle section of a red clay full face; arranging three couples of cut-holes (2) on the peripheral full face of the couple of central holes; arranging a circle of auxiliary holes (3) on the peripheral full face of the three couples of cut-holes (2); arranging a group of bottom holes breadthwise from the middle to the sides on the bottom of the red clay full face; b. loading dynamites into the holes for first blasting; c. arranging at least one circle of secondary auxiliary holes (4) around the periphery of the auxiliary holes on the red clay full face; arranging a circle of contour holes (5) on the peripheral full face of the secondary auxiliary holes (4); arranging a group of secondary bottom holes (7) on each of the two sides of the bottom holes of the red clay full face respectively; and d. loading dynamites into the holes for second blasting. The invention has the advantages that after the blasting parameters are optimized, the utilization efficiency of the blast holes can grow from 70% at present to 90% and the utilization efficiency of a plurality of circulation blast holes even can reach 100%.
Description
Technical field
The present invention relates to the pit mining blasting method, the efficient blasting method of especially a kind of admaic earth incline sinking.
Background technology
Admaic earth is different with the principle of the fragmentation of general ground, and what catalase relied on is the synergy of explosive charge stress wave and gas, and the clay fragmentation mainly is the effect that relies on explosion gas.Because the compressibility of clay can stay the explosion pit after the explosion on the clay wall, this provides great convenience to fragmentation principle and the explosive charge characteristic that we study clay.Quick-fried hole shape is except that outside the Pass having with charge constitution, and is also relevant with burden.When the burden around the cartridge bag was big, explosion energy all was used to compress its clay on every side, and the cross section in its quick-fried hole is circular, and quick-fried hole size is more much bigger than the quick-fried hole size that pinpoint blasting stays.When having less burden around the cartridge bag, quick-fried hole cross section no longer is circular, and the then elongation downwards of semicircle along resistance in the direction of the smallest line shows that when burden is suitable explosion gas will make the clay around it break, and dish out along resistance in the direction of the smallest line.
When carrying out the inclined shaft full-face blast becoming the work of lane tunneling construction in the admaic earth layer, its main blasting parameter will be considered following content:
(1) cutting method.The tunnel Cut Blasting is approximately the free funnel explosion that places an order of equivalent piecemeal concentrated charge, and the snubber spacing mainly utilizes fracture area size that the bar shaped powder charge produces in medium for according to determining.
(2) the slotting centre bore is provided with and effect.Because the Cut Blasting clipping is big, has the part red soil floor to be difficult to dish out, and causes blast hole utilization factor lower.
(3) borehole depth.Mainly by the rock drilling ability and the decision of workman's operant level of test requirements document, jewel hole facility, also relevant with quick-fried back unsupported back span, unsupported back span directly influences the supporting and the safe construction of country rock to borehole depth.
(4) explosion elementary errors time and firing order.When implementing short-delay blasting in the red soil floor, longitudinal wave velocity is about 1200～2000m/s in the argillic horizon, on same relative distance and cartridge bag basis, the compression phase length of the stress wave that produces in the red soil floor is longer mutually than the compression of stress wave in the lithosphere, in the closer scope of cartridge bag, the particle movement speed of red soil floor, displacement are bigger than lithosphere, and energy-flux density is little, after the too compacting and detonation not exclusively maybe can not be detonated of the blast hole projectile filling that the detonates stress wave that can be detonated earlier.Test is found, the explosion of group's cartridge bag is about 0.6～0.7m in the red soil floor, the displacement of red soil floor reaches more than the 5mm, even to 10mm, so big displacement is more much bigger than big gun interporal lacuna, the explosive that will detonate after will causing is compacted, cause miss-firing or detonation, therefore rationally elementary errors time and firing order are the key factors of restriction blasting efficiency, have both guaranteed that the previous time period detonating charge provided the scope of freedom for the explosive of next time period, the explosive that detonates after preventing again is compacted, and causes miss-firing or detonation.
Summary of the invention
Purpose of the present invention is exactly for the blasting method that overcomes existing general ground can not be used for the defective of admaic earth, and provides a kind of admaic earth incline sinking efficient blasting method.
The technical solution adopted for the present invention to solve the technical problems is:
The efficient blasting method of admaic earth incline sinking is characterized in that:
A. at place, the full face vertical middle section of admaic earth a pair of central eye is set, on the peripheral full section of a pair of central eye, three pairs of snubbers are set, on the peripheral full section of three pairs of snubbers, be provided with a circle reliever, eye at the bottom of the full section of admaic earth bottom is provided with a group by the intermediate lateral both sides;
B. in eyelet, load explosive, carry out onepull;
C. then, the above secondary reliever of a circle is set in the periphery of the full section reliever of admaic earth, on the peripheral full section of secondary reliever, is provided with a circle periphery hole, and be respectively equipped with one group of pair end eye in the both sides of the full section lower bottom of admaic earth eye;
D. in eyelet, load explosive, carry out secondary blasting.
On the basis of above-mentioned main technical schemes, can increase following further perfect technical scheme:
Described snubber wedge shape on the full section of admaic earth is dug, and preferably the horizontal sextant angle of its axis and the full face vertical middle section of admaic earth is 73 °, with the vertical angle of horizontal middle section be 90 °.
Described reliever wedge shape on the full section of admaic earth is dug, and preferably the horizontal sextant angle of its axis and the full face vertical middle section of admaic earth is 82 °, with the vertical angle of horizontal middle section be 90 °.
Eye of described end wedge shape on the full section of admaic earth is dug, and preferably the horizontal sextant angle of its axis and the full face vertical middle section of admaic earth is 87 °, with the vertical angle of horizontal middle section be 90 °.
Described secondary reliever wedge shape on the full section of admaic earth is dug, and preferably the horizontal sextant angle of its axis and the full face vertical middle section of admaic earth is 88 °, with the vertical angle of horizontal middle section be 90 °.
Described periphery hole wedge shape on the full section of admaic earth is dug, and preferably the horizontal sextant angle of its axis and the full face vertical middle section of admaic earth is 87 °, with the vertical angle of horizontal middle section be 90 °.
Eye wedge shape on the full section of admaic earth is dug at the described secondary end, and the horizontal sextant angle of its axis and the full face vertical middle section of admaic earth is 90 °, with the vertical angle of horizontal middle section be 85 °.
The snubber that at first detonates during onepull, the central eye of detonating after the time-delay, reliever, end eye.
The secondary reliever that at first detonates during secondary blasting, the periphery hole that detonates after the time-delay, eye of the secondary end.
The vertical depth of described central eye is 1900 ㎜～2100 ㎜.
The vertical depth of described snubber is than shallow 100 mm of central eye～200mm.
The vertical depth of described reliever is than shallow 100 mm of central eye～200mm.
The vertical depth of eye of the described end is than shallow 100 mm of central eye～200mm.
The vertical depth of described secondary reliever is than shallow 100 mm of central eye～200mm.
The vertical depth of described periphery hole is than shallow 100 mm of central eye～200mm.
The vertical depth of eye of the described secondary end is than shallow 100 mm of central eye～200mm.
Preferred mining No. 2 emulsions of described explosive.
The preferred 0.6kg of the explosive payload of described central eye.
The preferred 1.2kg of the explosive payload of described snubber.
The preferred 0.9kg of the explosive payload of described reliever.
The preferred 0.9kg of explosive payload of eye of the described end.
The preferred 0.9kg of the explosive payload of described secondary reliever.
The explosive payload of described periphery hole is 0.3 kg or 0.6kg.
The preferred 0.9kg of explosive payload of eye of the described secondary end.
After the invention has the beneficial effects as follows blasting parameters optimization, from on-the-spot record and statistics, the borehole number of split run circulation reduces 5 on existing basis, the split run cyclic advance is on average brought up to 1.72m by original 1.1m, blast hole utilization factor is arrived more than 90% by 70% original raising, and the circulation blast hole utilization factor that has reaches 100%.
Explosive consumption is reduced after the blasting parameters optimization, the original medication 31.7kg that amounts to of split run circulation, and the split run circulation amounts to medication 29.6kg behind the employing explosion prioritization scheme, and powder factor significantly is reduced to 1.25kg/m3 by original 1.69kg/m3.
Carry out short-delay blasting twice in strictness especially, it is other that the elementary errors time is controlled at a section, do not allow to jump section, the spacing arranged crosswise, and the height that has solved the explosion of the high-ductility admaic earth rate problem of miss-firing drops to present about 3% by the original rate of miss-firing 24%.
The present invention is further described below in conjunction with drawings and Examples.
Description of drawings:
Fig. 1 is that borehole of the present invention is arranged schematic diagram.
1. central eye among the figure, 2. snubber, 3. reliever, 4. secondary reliever, 5. periphery hole, 6. end eye, 7. secondary end eye.
The specific embodiment
The efficient blasting method of admaic earth incline sinking of the present invention, at first, the place is provided with a pair of central eye 1 in the full face vertical middle section of admaic earth, central eye 1 is arranged on place, vertical middle section with upper and lower relative position, the spacing of two central eye is preferably 500 ㎜, central eye is vertically dug on full section, digs the degree of depth and is preferably 2000 ㎜; On the peripheral full section of a pair of central eye 1, be provided with three pairs of snubbers 2, the three pairs of snubbers 2 with relative position, upper, middle and lower and in twos symmetrical manner be arranged on the both sides of a pair of central eye 1, the spacing of an any side two adjacent snubbers 2 is preferably 500 ㎜, snubber 2 wedge shape on the full section of admaic earth is dug, the horizontal sextant angle of preferred its axis and the full face vertical middle section of admaic earth is 73 °, with the vertical angle of horizontal middle section be 90 °, dig the degree of depth and be preferably 1900 ㎜; On the peripheral full section of three pairs of snubbers 2, be provided with a circle reliever 3, the quantity of reliever 3 determines according to full face area, preferred herein five relievers 3, five relievers 3 are distributed in the periphery of snubber 2 in fan-shaped mode, four both sides that are separately positioned on snubber 3 wherein, another is arranged on the place, vertical middle section of central eye 1 top, the spacing of two adjacent relievers 3 is preferably 600 ㎜, reliever 3 wedge shape on the full section of admaic earth is dug, the horizontal sextant angle of preferred its axis and the full face vertical middle section of admaic earth is 82 °, with the vertical angle of horizontal middle section be 90 °, dig the degree of depth and be preferably 1800 ㎜; Eye 6 at the bottom of the full section of admaic earth bottom is provided with one group by the intermediate lateral both sides, the quantity of end eye 6 is preferably three, one of them end eye 6 is arranged on the place, vertical middle section of central eye below, the spacing of two adjacent end eyes 6 is preferably 650 ㎜, end eye 6 wedge shape on the full section of admaic earth is dug, preferred its axis is 87 ° with the horizontal sextant angle of the full face vertical middle section of admaic earth, with the vertical angle of horizontal middle section be 90 °, the cutting degree of depth is preferably 1800 ㎜;
In each eyelet, load explosive, preferred mining No. 2 emulsions of explosive, the preferred 0.6kg of the explosive payload of central eye 1 wherein, the preferred 1.2kg of the explosive payload of snubber 2, the preferred 0.9kg of the explosive payload of reliever 3, the preferred 0.9kg of the explosive payload of end eye 6, after filling finishes, carry out onepull, the snubber 2 that at first detonates during onepull, the central eye of detonating after the time-delay 1, reliever 3, end eye 6.
On the peripheral full section of reliever 3, be provided with the secondary reliever 4 more than the circle, the quantity of the number of turns of secondary reliever 4 and the secondary reliever 4 of every circle determines according to full face area, eight secondary relievers 4 of a preferred herein circle, eight secondary relievers 4 are distributed in the periphery of reliever 3 in fan-shaped mode, the spacing of an any side two adjacent pair relievers 4 is preferably 600 ㎜, secondary reliever 4 wedge shape on the full section of admaic earth is dug, the horizontal sextant angle of preferred its axis and the full face vertical middle section of admaic earth is 88 °, with the vertical angle of horizontal middle section be 90 °, dig the degree of depth and be preferably 1800 ㎜; On the peripheral full section of secondary reliever 4, be provided with a circle periphery hole, general 5 mouths of periphery hole are apart from tunnel-surrounding 100mm, decision tunnel profile is shaped, the quantity of periphery hole 5 determines according to full face area, preferred herein 12 periphery holes 5,12 periphery holes 5 are distributed in the periphery of secondary reliever 4 in fan-shaped mode, the spacing of two adjacent periphery holes 5 is preferably 500 ㎜, periphery hole 5 wedge shape on the full section of admaic earth is dug, the horizontal sextant angle of preferred its axis and the full face vertical middle section of admaic earth is 87 °, with the vertical angle of horizontal middle section be 90 °, dig the degree of depth and be preferably 1800 ㎜; Be respectively equipped with one group of eye of the secondary end 7 in the both sides of the full section lower bottom of admaic earth eye 6, the quantity of eye of the secondary end 7 is preferably four, eye 6 every sides in the end are provided with two, the spacing of the two adjacent eyes of the secondary end 7 of one side is preferably 650 ㎜, eye 7 of secondary end wedge shape on the full section of admaic earth is dug, preferred its axis is 90 ° with the horizontal sextant angle of the full face vertical middle section of admaic earth, with the vertical angle of horizontal middle section be 85 °, the cutting degree of depth is preferably 1800 ㎜;
Then, in each eyelet, load explosive, preferred mining No. 2 emulsions of explosive, the preferred 0.9kg of the explosive payload of wherein secondary reliever 4, the explosive payload of periphery hole 5 is 0.3 kg or 0.6kg, the secondary end, help the preferred 0.9kg of explosive payload of eye 7, after filling finishes, carry out secondary blasting, the secondary reliever 4 that at first detonates during secondary blasting, the periphery hole 5 that detonates after the time-delay, eye of the secondary end 7.
During construction:
(1) blasthole diameter, medicine footpath
In the drill bursting construction, explosive is the key factor of decision demolition effect, comprises explosive type, charge diameter, and according to on-site actual situations, explosive adopts mining No. 2 emulsions.
(2) blast hole depth
Blast hole depth mainly is the unsupported back span decision according to the boring ability of test requirements document, jewel hole facility, workman's operant level, safety requirements, the blast hole depth of snubber adopts 1.8m according to the site operation level, cyclic advance is expected to be 1.6 ~ 1.7m, the vertical depth of central eye 1 is than snubber 2, reliever 3 dark 100 ~ 200mm, and the vertical depth of snubber 2, reliever 3 is than periphery hole 5, secondary reliever 4, end eye 6, secondary end eye 70 ~ 100mm.
(3) slotting scheme, central eye 1
When implementing the medium-length hole blasting about 2m, change cutting method, borehole layout, its cutting method is decided on lithology, equipment preparation etc., advance of working cycle is less than adopting three pairs of V-cut eyes 2 and two pairs of wedge shape relievers 3 during driving in the soft rock of 1.8m or the soil layer, the centre adds 2 central eye 1, central eye 1 depth ratio snubber 2 dark 100～200mm, distance was in strict conformity with designing requirement at the bottom of the angle of snubber 2 should guarantee its orifice distance, hole, cutting method and snubber 2 arranged and comprised that the eye distance strictness undertaken by the medium-length hole blasting specification, guarantee the explosion cyclic advance.
(4) reliever 3, periphery hole 5
Reliever 3 comprises that looking the section size has three circle eyes, two circle eyes, mainly be to be used for continuing to enlarge slotting, reliever 3 spacings are 600mm, are arranged between snubber 2 and the periphery hole 5, and direction is basically perpendicular to working face, periphery hole 5 directly determines the quality that the tunnel profile is shaped, general 5 mouths of periphery hole are apart from tunnel-surrounding 100mm, and periphery hole 5 spacings are unsuitable excessive, are generally 500mm, be beneficial to guarantee the drift section profile, reduce brushing or whitewashing amount as far as possible.
(5) igniting primer position
The determining positions of igniting primer detonation direction of wave travel behind the explosive initiation, also determined the action time of detonation gas, experiment shows, having under the situation of good obstruction, when adopting indirect initiation, the shock wave that explosive produces and the energy of detonation gas are used for the destruction to the big gun hole wall more, greatly reduce the quantity that detonation gas sprays from the big gun hole, even in highly gassy mine, indirect initiation is safe and reliable, up-to-date safe coal rules have been cancelled under the coal mine the restriction of indirect initiation in the driving, are to improve slotting effect and blast hole utilization factor, adopt indirect initiation.
(6) firing order
Full section adopts and punchinges for twice, two sections detonator short-delay blastings of twice powder charge, i.e. once boring, two sections blasting cap initiations of end eye 6 in the middle of the three pairs of snubbers 2, five relievers 3, central eye 1 and three.After forming vallecular cavity, carry out secondary reliever 4, periphery hole 5, eye of the secondary end 7 is punchinged, a powder charge, two sections blasting cap initiations, effectively control is because of crossing long millisecond detonating, thereby make the shot hole blasting stress wave that detonates earlier to after the detonate detonation that powder stick extruding in the big gun hole causes, the generation of the phenomenon of miss-firing.
Claims (10)
1. the efficient blasting method of admaic earth incline sinking is characterized in that:
A. at place, the full face vertical middle section of admaic earth a pair of central eye (1) is set, on the peripheral full section of a pair of central eye, three pairs of snubbers (2) are set, on the peripheral full section of three pairs of snubbers (2), be provided with a circle reliever (3), in the full section of admaic earth bottom by centre eye (6) at the bottom of both sides laterally are provided with a group;
B. in eyelet, load explosive, carry out onepull;
C. then, the periphery of the full section reliever of admaic earth be provided with one the circle more than secondary reliever (4), on the peripheral full section of secondary reliever (4), be provided with a circle periphery hole (5), and be respectively equipped with one group of secondary end eye (7) in the both sides of the full section lower bottom of admaic earth eye;
D. in eyelet, load explosive, carry out secondary blasting.
2. the efficient blasting method of admaic earth incline sinking according to claim 1, it is characterized in that: described snubber (2) wedge shape on the full section of admaic earth is dug, the horizontal sextant angle of preferred its axis and the full face vertical middle section of admaic earth is 73 °, with the vertical angle of horizontal middle section be 90 °.
3. the efficient blasting method of admaic earth incline sinking according to claim 1, it is characterized in that: described reliever (3) wedge shape on the full section of admaic earth is dug, the horizontal sextant angle of preferred its axis and the full face vertical middle section of admaic earth is 82 °, with the vertical angle of horizontal middle section be 90 °.
4. the efficient blasting method of admaic earth incline sinking according to claim 1, it is characterized in that: eye of the described end (6) wedge shape on the full section of admaic earth is dug, the horizontal sextant angle of preferred its axis and the full face vertical middle section of admaic earth is 87 °, with the vertical angle of horizontal middle section be 90 °.
5. the efficient blasting method of admaic earth incline sinking according to claim 1, it is characterized in that: described secondary reliever (4) wedge shape on the full section of admaic earth is dug, the horizontal sextant angle of preferred its axis and the full face vertical middle section of admaic earth is 88 °, with the vertical angle of horizontal middle section be 90 °.
6. the efficient blasting method of admaic earth incline sinking according to claim 1, it is characterized in that: described periphery hole (5) wedge shape on the full section of admaic earth is dug, the horizontal sextant angle of preferred its axis and the full face vertical middle section of admaic earth is 87 °, with the vertical angle of horizontal middle section be 90 °.
7. the efficient blasting method of admaic earth incline sinking according to claim 1, it is characterized in that: described secondary end eye (7) wedge shape on the full section of admaic earth is dug, the horizontal sextant angle of its axis and the full face vertical middle section of admaic earth is 90 °, with the vertical angle of horizontal middle section be 85 °.
8. the efficient blasting method of admaic earth incline sinking according to claim 1 is characterized in that: described explosive adopts mining No. 2 emulsions.
9. the efficient blasting method of admaic earth incline sinking according to claim 1 is characterized in that: the snubber (2) that at first detonates during onepull, the central eye of detonating after the time-delay (1), reliever (3), end eye (6).
10. the efficient blasting method of admaic earth incline sinking according to claim 1 is characterized in that: the secondary reliever (4) that at first detonates during secondary blasting, the periphery hole (5) that detonates after the time-delay, secondary end eye (7).
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Cited By (13)
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| CN102494571A (en) * | 2011-12-11 | 2012-06-13 | 中建八局大连建设工程有限公司 | Construction method for damped blasting of tunnels |
| CN102519325A (en) * | 2011-12-30 | 2012-06-27 | 大同煤矿集团有限责任公司 | Coal mine semi-coal-rock roadway smoothwall blasting method |
| CN103148749A (en) * | 2013-03-25 | 2013-06-12 | 姬云峰 | Symmetrical double-rotation blasting method |
| CN103670423A (en) * | 2013-11-14 | 2014-03-26 | 中铁隧道集团有限公司 | Method for excavating tunnel in layered phyllite body |
| CN103868420A (en) * | 2014-03-31 | 2014-06-18 | 江西稀有金属钨业控股集团有限公司 | Mine gallery driving cut blasting method |
| CN104180729A (en) * | 2014-08-20 | 2014-12-03 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Method for arrangement of blast holes of driving working face of driving trolley and detonator grading |
| CN104819670A (en) * | 2015-05-19 | 2015-08-05 | 重庆交通建设(集团)有限责任公司 | Pre-drilling mesopore shaft excavation blasting method |
| WO2017092306A1 (en) * | 2015-12-03 | 2017-06-08 | 中车建设工程有限公司 | Medium-length hole large cross-section composite cut blasting structure and method |
| CN110259460A (en) * | 2019-06-21 | 2019-09-20 | 铜陵有色金属集团股份有限公司 | A kind of inclined chute forming method of kaolin suspension |
| CN110924957A (en) * | 2019-12-26 | 2020-03-27 | 重庆能投渝新能源有限公司 | Blast hole arrangement mode and blast hole construction method for all-rock roadway small-section roadway |
| CN111022062A (en) * | 2019-12-06 | 2020-04-17 | 首钢滦南马城矿业有限责任公司 | Construction method for clay layer section of ramp |
| CN112254598A (en) * | 2020-10-16 | 2021-01-22 | 重庆大学 | Hard rock large-section trolley tunneling control blasting method |
| CN113465460A (en) * | 2021-06-25 | 2021-10-01 | 嵩县山金矿业有限公司 | Two-step mining control blasting method for underground downward access of mine |
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| CN102494571A (en) * | 2011-12-11 | 2012-06-13 | 中建八局大连建设工程有限公司 | Construction method for damped blasting of tunnels |
| CN102519325A (en) * | 2011-12-30 | 2012-06-27 | 大同煤矿集团有限责任公司 | Coal mine semi-coal-rock roadway smoothwall blasting method |
| CN103148749B (en) * | 2013-03-25 | 2015-08-05 | 姬云峰 | A kind of symmetrical double-rotation blasting method |
| CN103148749A (en) * | 2013-03-25 | 2013-06-12 | 姬云峰 | Symmetrical double-rotation blasting method |
| CN103670423A (en) * | 2013-11-14 | 2014-03-26 | 中铁隧道集团有限公司 | Method for excavating tunnel in layered phyllite body |
| CN103670423B (en) * | 2013-11-14 | 2016-04-06 | 中铁隧道集团有限公司 | A kind of method of tunneling on stratiform phyllite rock mass |
| CN103868420A (en) * | 2014-03-31 | 2014-06-18 | 江西稀有金属钨业控股集团有限公司 | Mine gallery driving cut blasting method |
| CN104180729A (en) * | 2014-08-20 | 2014-12-03 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Method for arrangement of blast holes of driving working face of driving trolley and detonator grading |
| CN104819670A (en) * | 2015-05-19 | 2015-08-05 | 重庆交通建设(集团)有限责任公司 | Pre-drilling mesopore shaft excavation blasting method |
| WO2017092306A1 (en) * | 2015-12-03 | 2017-06-08 | 中车建设工程有限公司 | Medium-length hole large cross-section composite cut blasting structure and method |
| CN110259460A (en) * | 2019-06-21 | 2019-09-20 | 铜陵有色金属集团股份有限公司 | A kind of inclined chute forming method of kaolin suspension |
| CN110259460B (en) * | 2019-06-21 | 2021-01-05 | 铜陵有色金属集团股份有限公司 | Inclined chute forming method of high-pass shaft |
| CN111022062A (en) * | 2019-12-06 | 2020-04-17 | 首钢滦南马城矿业有限责任公司 | Construction method for clay layer section of ramp |
| CN111022062B (en) * | 2019-12-06 | 2022-09-16 | 首钢滦南马城矿业有限责任公司 | Construction method for clay layer section of ramp |
| CN110924957A (en) * | 2019-12-26 | 2020-03-27 | 重庆能投渝新能源有限公司 | Blast hole arrangement mode and blast hole construction method for all-rock roadway small-section roadway |
| CN112254598A (en) * | 2020-10-16 | 2021-01-22 | 重庆大学 | Hard rock large-section trolley tunneling control blasting method |
| CN113465460A (en) * | 2021-06-25 | 2021-10-01 | 嵩县山金矿业有限公司 | Two-step mining control blasting method for underground downward access of mine |
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Application publication date: 20111102 |