CN107255433A - The long drilling depth guide well photoface exploision excavating load of a kind of soft rock, dead-soft petrographic province major diameter surge shaft - Google Patents

The long drilling depth guide well photoface exploision excavating load of a kind of soft rock, dead-soft petrographic province major diameter surge shaft Download PDF

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Publication number
CN107255433A
CN107255433A CN201710549638.4A CN201710549638A CN107255433A CN 107255433 A CN107255433 A CN 107255433A CN 201710549638 A CN201710549638 A CN 201710549638A CN 107255433 A CN107255433 A CN 107255433A
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China
Prior art keywords
shaft
surge
surge shaft
hole
meters
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CN201710549638.4A
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CN107255433B (en
Inventor
彭鹏
单治钢
李华
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Powerchina Huadong Engineering Corp Ltd
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Powerchina Huadong Engineering Corp Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D1/00Blasting methods or apparatus, e.g. loading or tamping
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D3/00Particular applications of blasting techniques
    • F42D3/04Particular applications of blasting techniques for rock blasting

Abstract

A kind of soft rock of the present invention, the long drilling depth guide well photoface exploision excavating load of dead-soft petrographic province major diameter surge shaft, including(A)Long drilling depth guide well excavate and(B)The step of surge shaft is excavated.Wherein,(A)Include I. lay the first pilot shaft detonation of the blast hole of first pilot shaft, II., the first pilot shafts of III. slag tap, the small step of IV. located level blast holes;(B)Include V. and lay the small step that the blast hole of surge shaft, VI. surge shafts are detonated, VII. surge shafts are slagged tap.By way of explosion hole site, setting firing order, the hole depth for designing each blast hole, aperture and the burst strength of arranging first pilot shaft and surge shaft, the problem of before solution due to the thorough peeling of country rock and concrete lining that explosion, excavation are caused repeatedly, cracking, chip off-falling, realize Smooth Blasting Effects, it is disposable to excavate shaping, slag tap from top to bottom, improve form of construction work, improve operating efficiency, driving progress has been effectively ensured, the duration is shortened, the safety of personnel and equipment is also ensure that.

Description

The long drilling depth guide well photoface exploision of a kind of soft rock, dead-soft petrographic province major diameter surge shaft is opened Digging method
Technical field
The present invention relates to Hydraulic and Hydro-Power Engineering technical field, and in particular to a kind of soft rock, dead-soft petrographic province major diameter surge shaft Long drilling depth guide well photoface exploision excavating load.
Background technology
In field of water conservancy, surge shaft is a kind of common hydraulic structure structure, the vertical depth of its built engineering Scope can be from more than ten meters to more than 400 meters, and diameter range is from several meters to tens meters.Surge shaft directly can provide hydrodynamic(al) for the hydraulic turbine Power, its excavation quality and smooth effect have a significant impact to the effect of exerting oneself in hydraulic turbine later stage, are directly connected to generated energy, even It is related to the operational efficiency in whole power station.
The object that the present invention is studied is the method for excavating major diameter surge shaft in soft rock, dead-soft petrographic province.Soft rock, ultimate soft rock Refer to that low intensity, porosity are big, degree of consolidation is poor, influenceed by construction face cutting and weathering significantly or containing a large amount of expansive clays The loose, scattered, soft of mineral, incompetent beds, the complicated geologic medium being naturally occurring, typically regard uniaxial compressive strength 30MP as boundary Determine the differentiation standard of soft rock and hard rock, soft rock, ultimate soft rock are then defined as less than 30MP.Work as major diameter(More than 10 meters)Surge shaft During in soft rock, dead-soft petrographic province, generally using conventional full face tunneling method for protecting support, with short drilling depth explosion, take from upper Under drilling and blasting method it is incremental.After each drilling depth explosion, the country rock for excavating border is highly prone to explosion influence, cracking, stripping Fall, chip off-falling, backbreak, even large area landslide phenomenon, serve as a contrast thorough work to the later stage and cause great difficulty, in addition, explosion shake repeatedly The thorough concrete of the dynamic country rock that thorough mistake has easily been served as a contrast to upper strata and lining causes the influence for deforming, ftractureing and caving in.This has a strong impact on Progress, cost, quality and the safety of surge shaft excavation construction.
The content of the invention
Improve form of construction work it is an object of the invention to provide one kind, improve operating efficiency, reduction construction risk, alleviation country rock The long drilling depth guide well smooth surface of soft rock, dead-soft petrographic province major diameter surge shaft with concrete lining peeling, cracking and chip off-falling problem is quick-fried Broken excavating load.
In order to achieve the above object, the present invention is achieved through the following technical solutions:
The long drilling depth guide well photoface exploision excavating load of a kind of soft rock, dead-soft petrographic province major diameter surge shaft, comprises the following steps:
(A)Long drilling depth guide well is excavated
First pilot shaft is laid in circular focal point of working, and with excavation face formation concentric structure, first pilot shaft cutting depth runs through pressure regulation Well, 1/3rd of the first a diameter of surge shaft diameter of pilot shaft;
I. the blast hole of first pilot shaft is laid
First pilot shaft circle centre position lays center blast hole, depth penetration surge shaft, whole powder charge;Distance center blast hole 0.8- 8 blast holes, depth penetration surge shaft, whole powder charge are uniformly laid at 1.2 meters using it as the center of circle;Distance center blast hole 1.6- 8 photoface exploision control holes, depth penetration surge shaft, whole powder charge are uniformly laid at 2.4 meters using it as the center of circle;
II. first pilot shaft detonation
Detonate photoface exploision control hole first, and detonate center blast hole and blast hole simultaneously after 0.5 second at interval;
III. first pilot shaft is slagged tap
Using the first pilot shaft country rock of steel fiber reinforced concrete spray shield, spray shield thickness is 8-10 centimetres;After concrete spray shield construction 48 hours, First pilot shaft is slagged tap from top to bottom;
IV. located level blast hole
In first pilot shaft tapping process, while the horizontal blasting hole parallel with circular excavation face is formerly laid in pilot shaft at the borehole wall, The number of plies in horizontal blasting hole runs through equal centered on its axis at surge shaft, first 0.8-1.2 meters of the pilot shaft well head of first layer distance The 8 horizontal blasting holes of even located level direction radially, lay downwards second layer level at 0.8-1.2 meters of first layer Blast hole, by that analogy untill laying completion bottom horizontal blasting hole;
(B)Surge shaft is excavated
V. the blast hole of surge shaft is laid
Uniformly lay 8 blast holes using it as the center of circle at 2.4-3.6 meters of surge shaft axis, depth penetration surge shaft, entirely Journey powder charge;Uniformly lay 8 blast holes using it as the center of circle at 3.2-4.8 meters of surge shaft axis, depth penetration surge shaft, Whole powder charge;Uniformly lay 8 blast holes using it as the center of circle at 4-6 meters of surge shaft axis, depth penetration surge shaft, entirely Journey powder charge;32 photoface exploision control holes are uniformly laid using it as the center of circle at 4.8-7.2 meters of surge shaft axis, depth is passed through Wear surge shaft, whole powder charge;
VI. surge shaft detonates
Detonate photoface exploision control hole first, and detonate horizontal blasting hole and blast hole simultaneously after 0.5 second at interval;
VII. surge shaft is slagged tap
Using steel fiber reinforced concrete spray shield surge shaft country rock, spray shield thickness is 20 centimetres, and petrous branch shield is entered as anchor pole using reinforcing bar, After steel fiber reinforced concrete spray shield construction 48 hours, surge shaft is slagged tap from top to bottom.
Further, the center blast hole aperture of first pilot shaft is 40mm, and burst strength is 0.08kg/T;Distance center explosion Blast hole aperture at hole 0.8-1.2 meters is 30mm, and burst strength is 0.08kg/T;At 1.6-2.4 meters of distance center blast hole Blast hole aperture be 80mm, burst strength be 0.03 kg/T.
Further, horizontal blasting hole aperture is 50mm, and burst strength is 0.06kg/T.
Further, the blast hole aperture at 2.4-3.6 meters of surge shaft axis is 40mm, and burst strength is 0.08 kg/T;Blast hole aperture at 3.2-4.8 meters of surge shaft axis is 40mm, and burst strength is 0.08 kg/T;Distance is adjusted Blast hole aperture at 4-6 meters of kill-job axis is 50mm, and burst strength is 0.06 kg/T;Apart from surge shaft axis 4.8- Photoface exploision control hole aperture at 7.2 meters is 80mm, and burst strength is 0.03 kg/T.
Further, it is used for a diameter of 28mm of reinforced anchor bolt of supporting after the completion of surge shaft explosion, enters rock depth for nine meters, Anchor pole spacing is 1.5m × 1.5m.
The present invention compared with prior art, has the advantages that:
A kind of soft rock of the present invention, the long drilling depth guide well photoface exploision excavating load of dead-soft petrographic province major diameter surge shaft using first pilot shaft and The excavation method of long drilling depth, blast hole installation position is reasonable, cover in place;Periphery photoface exploision hole aperture it is larger, dose compared with It is few, the disturbance to outside country rock can be reduced, smooth effect is realized;It is disposable to excavate shaping, slag tap from top to bottom, blasting efficiency Height, effect is good.
The present invention is being solved because the thorough peeling of country rock and concrete lining that explosion, excavation are caused repeatedly, cracking, chip off-falling are asked While topic, form of construction work is improved, operating efficiency is improved, driving progress has been effectively ensured, the duration is shortened, also ensure that Personnel and the safety of equipment.
Brief description of the drawings
Fig. 1 is a kind of soft rock of the invention, the long drilling depth guide well photoface exploision excavating load of dead-soft petrographic province major diameter surge shaft Blast hole lays floor map.
Fig. 2 is a kind of soft rock of the invention, the long drilling depth guide well photoface exploision excavating load of dead-soft petrographic province major diameter surge shaft Blast hole lays A-A ' profiles.
Fig. 3 is a kind of soft rock of the invention, the long drilling depth guide well photoface exploision excavating load of dead-soft petrographic province major diameter surge shaft Blast hole lays B-B ' profiles.
Embodiment
Below in conjunction with the accompanying drawings, embodiments of the invention are described in further detail.
So that a diameter of 12 meters, depth is 20 meters of surge shafts as an example, implement technical scheme.
A kind of long drilling depth guide well photoface exploision excavating load of soft rock, dead-soft petrographic province major diameter surge shaft, it is characterised in that bag Include following steps:
(A)Long drilling depth guide well is excavated
First pilot shaft is laid in circular focal point of working, and with excavation face formation concentric structure, first pilot shaft cutting depth runs through pressure regulation Well, 1/3rd of the first a diameter of surge shaft diameter of pilot shaft;
I. the blast hole of first pilot shaft is laid
First pilot shaft circle centre position lays center blast hole 301, and depth penetration surge shaft, aperture is 40mm, and whole powder charge, explosion is strong Spend for 0.08kg/T;8 blast holes 302 are uniformly laid at 301 1 meters of distance center blast hole using it as the center of circle, depth penetration is adjusted Kill-job, aperture is 30mm, and whole powder charge, burst strength is 0.08kg/T;Using it as the center of circle at 301 two meters of distance center blast hole 8 photoface exploision control holes 303 are uniformly laid, depth penetration surge shaft, aperture is 80mm, whole powder charge, and burst strength is 0.03 kg/T;
II. first pilot shaft detonation
Detonate photoface exploision control hole 303 first, and detonate center blast hole 301 and blast hole 302 simultaneously after 0.5 second at interval;
III. first pilot shaft is slagged tap
Using the first pilot shaft country rock of steel fiber reinforced concrete spray shield, spray shield thickness is 8-10 centimetres;After concrete spray shield construction 48 hours, First pilot shaft is slagged tap from top to bottom;
IV. located level blast hole
In first pilot shaft tapping process, while the horizontal blasting hole parallel with circular excavation face is formerly laid in pilot shaft at the borehole wall 308, aperture is 50mm, whole powder charge, and burst strength is 0.06kg/T, and the number of plies in horizontal blasting hole 308 runs through surge shaft, now For 20 layers, at first 1 meter of the pilot shaft well head of first layer distance centered on its axis uniform located level direction radially 8 Horizontal blasting hole 308, lays downwards second layer horizontal blasting hole 308 at 1 meter of first layer, is completed by that analogy until laying Untill 20th layer of horizontal blasting hole 308,160 horizontal blasting holes 308 altogether;
(B)Surge shaft is excavated
V. the blast hole of surge shaft is laid
8 blast holes 304, depth penetration surge shaft, aperture are uniformly laid using it as the center of circle at three meters of surge shaft axis For 40mm, whole powder charge, burst strength is 0.08 kg/T;It is uniform using it as the center of circle at four meters of surge shaft axis to lay 8 Individual blast hole 305, depth penetration surge shaft, aperture is 40mm, whole powder charge, and burst strength is 0.08 kg/T;Apart from surge shaft 8 blast holes are uniformly laid at five meters of axis using it as the center of circle, depth penetration surge shaft, aperture is 50mm, whole powder charge, quick-fried Broken intensity is 0.06 kg/T;32 photoface exploision control holes are uniformly laid using it as the center of circle at six meters of surge shaft axis 307, depth penetration surge shaft, aperture is 80mm, whole powder charge, and burst strength is 0.03 kg/T;
VI. surge shaft detonates
Detonation photoface exploision control hole 307 first, interval detonated simultaneously after 0.5 second horizontal blasting hole 308 and blast hole 304, 305、306;
VII. surge shaft is slagged tap
Using steel fiber reinforced concrete spray shield surge shaft country rock, spray shield thickness is 20 centimetres, and anchor pole, bolt diameter are used as using reinforcing bar For 28mm, it is 9 meters to enter rock depth, and anchor pole spacing is 1.5m × 1.5m, after steel fiber reinforced concrete spray shield is constructed 48 hours, surge shaft Slag tap from top to bottom.
For other diameters and the surge shaft of depth, the distance between blast hole should be controlled between 0.8-1.2 meters, ability Reach optimal Blasting Excavation effect.
Described above is only the preferred embodiment for the present invention, it is noted that for those skilled in the art, Without departing from the inventive concept of the premise, some improvements and modifications can also be made, these improvements and modifications also should be regarded as this In invention protection domain.

Claims (5)

1. the long drilling depth guide well photoface exploision excavating load of a kind of soft rock, dead-soft petrographic province major diameter surge shaft, it is characterised in that including Following steps:
(A)Long drilling depth guide well is excavated
First pilot shaft is laid in circular focal point of working, and with excavation face formation concentric structure, first pilot shaft cutting depth runs through pressure regulation Well, 1/3rd of the first a diameter of surge shaft diameter of pilot shaft;
I. the blast hole of first pilot shaft is laid
First pilot shaft circle centre position lays center blast hole(301), depth penetration surge shaft, whole powder charge;Distance center blast hole (301)8 blast holes are uniformly laid at 0.8-1.2 meters using it as the center of circle(302), depth penetration surge shaft, whole powder charge;Distance Center blast hole(301)1.6-2.4 sentences it and uniformly lays 8 photoface exploision control holes for the center of circle(303), depth penetration pressure regulation Well, whole powder charge;
II. first pilot shaft detonation
Detonate photoface exploision control hole first(303), detonate center blast hole simultaneously after 0.5 second at interval(301)And blast hole (302);
III. first pilot shaft is slagged tap
Using the first pilot shaft country rock of steel fiber reinforced concrete spray shield, spray shield thickness is 8-10 centimetres;After concrete spray shield construction 48 hours, First pilot shaft is slagged tap from top to bottom;
IV. located level blast hole
In first pilot shaft tapping process, while the horizontal blasting hole parallel with circular excavation face is formerly laid in pilot shaft at the borehole wall (308), horizontal blasting hole(308)The number of plies run through at surge shaft, first 0.8-1.2 meters of the pilot shaft well head of first layer distance with its axis The 8 horizontal blasting holes of uniform located level direction radially centered on line(308), at 0.8-1.2 meters of first layer to Lower laying second layer horizontal blasting hole(308), complete bottom horizontal blasting hole until laying by that analogy(308)Untill;
(B)Surge shaft is excavated
V. the blast hole of surge shaft is laid
8 blast holes are uniformly laid using it as the center of circle at 2.4-3.6 meters of surge shaft axis(304), depth penetration pressure regulation Well, whole powder charge;8 blast holes are uniformly laid using it as the center of circle at 3.2-4.8 meters of surge shaft axis(305), depth Through surge shaft, whole powder charge;8 blast holes are uniformly laid using it as the center of circle at 4-6 meters of surge shaft axis, depth is passed through Wear surge shaft, whole powder charge;32 photoface exploision controls are uniformly laid using it as the center of circle at 4.8-7.2 meters of surge shaft axis Drilling(307), depth penetration surge shaft, whole powder charge;
VI. surge shaft detonates
Detonate photoface exploision control hole first(307), after 0.5 second while horizontal blasting hole of detonating of interval(308)And blast hole (304)(305)(306);
VII. surge shaft is slagged tap
Using steel fiber reinforced concrete spray shield surge shaft country rock, spray shield thickness is 20 centimetres, and petrous branch shield is entered as anchor pole using reinforcing bar, After steel fiber reinforced concrete spray shield construction 48 hours, surge shaft is slagged tap from top to bottom.
2. the long drilling depth guide well photoface exploision of a kind of soft rock according to claim 1, dead-soft petrographic province major diameter surge shaft is opened Digging method, it is characterised in that:The center blast hole of first pilot shaft(301)Aperture is 40mm, and burst strength is 0.08kg/T;Distance center Blast hole(301)Blast hole at 0.8-1.2 meters(302)Aperture is 30mm, and burst strength is 0.08kg/T;Distance center explosion Hole(301)Blast hole at 1.6-2.4 meters(303)Aperture is 80mm, and burst strength is 0.03 kg/T.
3. the long drilling depth guide well photoface exploision of a kind of soft rock according to claim 1, dead-soft petrographic province major diameter surge shaft is opened Digging method, it is characterised in that:Horizontal blasting hole(308)Aperture is 50mm, and burst strength is 0.06kg/T.
4. the long drilling depth guide well photoface exploision of a kind of soft rock according to claim 1, dead-soft petrographic province major diameter surge shaft is opened Digging method, it is characterised in that:Blast hole at 2.4-3.6 meters of surge shaft axis(304)Aperture is 40mm, and burst strength is 0.08 kg/T;Blast hole at 3.2-4.8 meters of surge shaft axis(305)Aperture is 40mm, and burst strength is 0.08 kg/T;Blast hole at 4-6 meters of surge shaft axis(306)Aperture is 50mm, and burst strength is 0.06 kg/T;Distance Photoface exploision control hole at 4.8-7.2 meters of surge shaft axis(307)Aperture is 80mm, and burst strength is 0.03 kg/T.
5. the long drilling depth guide well photoface exploision of a kind of soft rock according to claim 1, dead-soft petrographic province major diameter surge shaft is opened Digging method, it is characterised in that:It is used for a diameter of 28mm of reinforced anchor bolt of supporting after the completion of surge shaft explosion, enters rock depth for nine meters, Anchor pole spacing is 1.5m × 1.5m.
CN201710549638.4A 2017-07-07 2017-07-07 A kind of soft rock, the long drilling depth guide well photoface exploision excavating load of dead-soft petrographic province major diameter surge shaft Active CN107255433B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101349064A (en) * 2008-08-26 2009-01-21 中国水利水电第五工程局 Construction method of hydroelectric power station surge chamber vertical shaft under soft rock geological condition
CN101487376A (en) * 2009-02-14 2009-07-22 中国葛洲坝集团股份有限公司 One-time excavation construction method for large-diameter large-depth pressure regulating well pilot shaft
CN102445117A (en) * 2011-12-06 2012-05-09 兰州大学 V-notch blasting and smooth blasting combination control blasting procedure
CN102494570A (en) * 2011-12-06 2012-06-13 兰州大学 Energy collecting blasting and smooth surface blasting combined control blasting method
CN105041325A (en) * 2015-07-13 2015-11-11 长沙理工大学 Construction method of high-tension water-rich extra-large-section weak breccia tunnel
CN105714748A (en) * 2016-02-22 2016-06-29 中国水利水电第十一工程局有限公司 Excavating construction method for surge shaft in gravel and sandy soil layer
CN106194195A (en) * 2016-07-22 2016-12-07 中铁建大桥工程局集团第五工程有限公司 Collapsible Loess District large cross-section tunnel three step is without remaining core soil in advance construction method
CN106643361A (en) * 2016-12-22 2017-05-10 中建八局第二建设有限公司 Construction method for excavating upper drift heading and lower drift heading in two side walls of ultra-large subsurface tunnel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101349064A (en) * 2008-08-26 2009-01-21 中国水利水电第五工程局 Construction method of hydroelectric power station surge chamber vertical shaft under soft rock geological condition
CN101487376A (en) * 2009-02-14 2009-07-22 中国葛洲坝集团股份有限公司 One-time excavation construction method for large-diameter large-depth pressure regulating well pilot shaft
CN102445117A (en) * 2011-12-06 2012-05-09 兰州大学 V-notch blasting and smooth blasting combination control blasting procedure
CN102494570A (en) * 2011-12-06 2012-06-13 兰州大学 Energy collecting blasting and smooth surface blasting combined control blasting method
CN105041325A (en) * 2015-07-13 2015-11-11 长沙理工大学 Construction method of high-tension water-rich extra-large-section weak breccia tunnel
CN105714748A (en) * 2016-02-22 2016-06-29 中国水利水电第十一工程局有限公司 Excavating construction method for surge shaft in gravel and sandy soil layer
CN106194195A (en) * 2016-07-22 2016-12-07 中铁建大桥工程局集团第五工程有限公司 Collapsible Loess District large cross-section tunnel three step is without remaining core soil in advance construction method
CN106643361A (en) * 2016-12-22 2017-05-10 中建八局第二建设有限公司 Construction method for excavating upper drift heading and lower drift heading in two side walls of ultra-large subsurface tunnel

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