CN101363321A - Application method for horizontal V-shaped tunnel face for digging tunnel - Google Patents
Application method for horizontal V-shaped tunnel face for digging tunnel Download PDFInfo
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- CN101363321A CN101363321A CNA2008100461407A CN200810046140A CN101363321A CN 101363321 A CN101363321 A CN 101363321A CN A2008100461407 A CNA2008100461407 A CN A2008100461407A CN 200810046140 A CN200810046140 A CN 200810046140A CN 101363321 A CN101363321 A CN 101363321A
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Abstract
The present invention relates to a construction method for using a horizontal V-shaped tunnel face during tunneling. In the method, the value of bore diameter B is confirmed firstly; then the value of bore depth L and the V-shaped tunnel face inner oblique depth L1 are confirmed according to the arrangement of tapping equipments and construction schedule; an undercutting form is confirmed according to the rock hardness; the value of the V-shaped tunnel face inner oblique angle a is confirmed according to the undercutting form, the rock hardness, the joint development condition and the bore depth L; and finally, blasting operation is conducted after undercutting according to the bore diameter B, the bore depth L, the V-shaped tunnel face inner oblique depth L1, the V-shaped tunnel face inner oblique angle a and the selected undercutting form. The present invention improves the utilization rate of the blast bore greatly, reduces the waste of explosive and the quantity of bores and ensures that the single circulation drilling footage is possible to exceed the bore depth. The waste of explosive and the quantity of bores are reduced, so the cost is reduced greatly.
Description
Technical field
The present invention relates to a kind of job practices of tunnel excavation, the job practices that particularly horizontal V-shaped face uses in tunnel excavation.
Background technology
For a long time, tunnel excavation adopts concordant face always, and because the size and the quantity on the scope of freedom have tangible influence to demolition effect.Be subjected to the clamping action of rock big during concordant face explosion, explosion difficulty, powder factor height.
Summary of the invention
At the problems referred to above, the present invention has announced the application process of horizontal V-shaped face in a kind of tunnel excavation.This method step is as follows:
1) determines bore diameter B value;
2) determine oblique degree of depth L1 in drilling depth L value and the V-arrangement face according to slag tap equipment and construction speed arrangement;
3) determine cutting method according to formation hardness;
4) according to cutting method and formation hardness and joints development situation, drilling depth L, determine V-arrangement face inner bevel a value;
5) according to tiltedly degree of depth L1, V-arrangement face inner bevel a value and selected cutting method carry out slotting in bore diameter B, drilling depth L, the V-arrangement face;
6) after slotting is finished, carry out bursting work.
Wherein, V-arrangement face inner bevel a gets 25～40 ° when adopting V-cut; When adopting the straight hole slotting, get 30～50 °.And when formation hardness height, joint agensis, boring are dark, get big value,, joints development low, get the small value when boring is more shallow when formation hardness.Drilling depth L span is 0.5～0.95B, oblique degree of depth L in the V-arrangement face
1=(B/2) tg a.
Simultaneously, cutting method is for when formation hardness f≤8, and hole depth is not when being subjected to the tunnel section restriction, adopt the wedge type slotting, when the rock densification hard, f〉8, and joint agensis or drilling depth are subjected to tunnel section when restriction, or adopt the wedge type slotting and effect when relatively poor, adopt the straight hole slotting
The present invention has improved the blasting boreholes utilization rate greatly, has reduced explosive specific charge, has reduced drilling hole amount, and makes the single cycle drilling depth become possibility above drilling depth.Because the minimizing of explosive specific charge and drilling hole amount, cost also reduce greatly.
Description of drawings
Fig. 1 is the face horizontal sectional drawing by the slotting center;
Fig. 2 is each key element schematic diagram of V-arrangement face among the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done and to be explained in more detail.
The application process of horizontal V-shaped face in a kind of tunnel excavation, this method step is as follows:
1) determines bore diameter B value;
2) determine oblique degree of depth L1 in drilling depth L value and the V-arrangement face according to slag tap equipment and construction speed arrangement;
3) determine cutting method according to formation hardness;
4) according to cutting method and formation hardness and joints development situation, drilling depth L, determine V-arrangement face inner bevel a value;
5) according to tiltedly degree of depth L1, V-arrangement face inner bevel a value and selected cutting method carry out slotting in bore diameter B, drilling depth L, the V-arrangement face;
6) after slotting is finished, carry out bursting work.
In the explosion, the size on the scope of freedom and quantity have tangible influence to demolition effect, and scope of freedom area is more little, number is few more, and the clamping action of rock is big during explosion, the explosion difficulty, and powder factor increases.The position of face is also influential to explosion, and the projection of the powder charge in the big gun hole on face is bigger, more helps the detonation stresses wave reflection, and be more favourable to fractured rock.Powder charge when adopting concordant face in the big gun hole is vertical with face, and the projection on face is minimum, so the explosion and crushing scope is also very little; When the big gun hole became oblique to arrange with face, the projected area of powder charge on face was bigger, and the explosion and crushing scope is also bigger.
Consult Fig. 1, as can be seen from the figure, face becomes the scope of freedom of two relative tilts by an original concordant scope of freedom, and the area on the scope of freedom also increases thereupon.In addition, it is a lot of behind the front-seat shot hole blasting to be that the free face area created of artillery salvo hole, back increases during also than concordant face, and the free face degree of depth that create in artillery salvo hole before the more important thing is all substantially exceeds at the bottom of the hole, gang drill hole, back, thereby makes the explosion clamping action reduce to minimum.A
1Residual hole is stayed in artillery salvo hole before during by concordant face; A
2For the V-arrangement face is arranged the free face that the hole of stretching tight increases for the back; A is the free face that the capable face of V increases during than concordant face.
No matter thus, adopt horizontal V-shaped face, be that scope of freedom quantity or scope of freedom area all improve a lot when adopting concordant face, thereby the clamping action during explosion also reduces greatly, improved demolition effect, reduces powder factor.In addition, horizontal V-shaped face becomes oblique with main blast hole, has increased the projected area of big gun hole on face, thereby has increased the broken scope of shot hole blasting, helps the improvement of demolition effect.
As Fig. 2, in the key element of V-arrangement face, a is the face inner bevel; L is the design drilling depth; L1 is the oblique degree of depth in the face; B is the tunnel excavation diameter.In order to obtain good demolition effect, must correctly determine above-mentioned face key element.
Repeatedly the construction practice shows that choosing of a value is relevant with cutting method, formation hardness, joints development situation and drilling depth.When adopting the wedge type slotting, a gets 25～40 °; When adopting the straight hole slotting, a gets 30～50 °; And when country rock hardness height, joint agensis, boring are dark, get big value, otherwise get the small value, its value size is also constantly adjusted according to condition of construction, to adapt to the country rock of continuous variation.The L value can be taken as: L=0.5～0.95B, its concrete value is relevant with equipment of slagging tap and construction speed arrangement etc.Oblique degree of depth L in the face
1=(B/2) tg a.
And in the construction, the layout of easer will be considered the hardness of rock.When formation hardness f≤8, and hole depth is not subjected to tunnel section when restriction, adopts the wedge type slotting, when the rock densification hard, f〉8, and joint agensis or drilling depth be when being subjected to the tunnel section restriction, or adopt the wedge type slotting and effect when relatively poor, adopts the straight hole slotting.
Zhao Shan crosses in the diversion works, being permitted the Ao import, when f is 10～12, adopts concordant face, hole depth 2.3m, and 20 of periods, drilling depth 33.6m, 52 ± 1 of hole counts, then the unit consumption of explosive is 2.8kg.m
-3, the utilization rate of boring then is 73.0%.
Equally,, adopt horizontal V-shaped face being permitted the Ao import when f is 10～12, hole depth 2.8m, 20 of periods, drilling depth 57.2m, 47 ± 1 of hole counts, then the unit consumption of explosive is 1.95kg.m
-3, the boring utilization rate is 102.1%
In the import of last peace tunnel, when f is 6～8, adopt concordant face, hole depth 2.3m, 20 of periods, drilling depth 34.0m, hole count 50 ± 1, then explosive specific charge is 2.1kg.m
-3, the boring utilization rate is 73.9%.
In last peace tunnel outlet, when f is 6～8, adopt horizontal V-shaped face, hole depth 2.3m, 20 of periods, drilling depth 34.0m, hole count 48 ± 1, then the unit consumption of explosive is 1.69kg.m
-3, the boring utilization rate is 99.1%.
Therefore, adopt horizontal V-shaped face to carry out tunnel excavation and can improve the blasting boreholes utilization rate greatly, reduce explosive specific charge, reduce drilling hole amount, and make single cycle drilling depth drilling depth become possibility above drilling depth.
Claims (6)
1. the application process of horizontal V-shaped face in the tunnel excavation is characterized in that this method step is as follows:
1) determines bore diameter B value;
2) determine oblique degree of depth L1 in drilling depth L value and the V-arrangement face according to slag tap equipment and construction speed arrangement;
3) determine cutting method according to formation hardness;
4) according to cutting method and formation hardness and joints development situation, drilling depth L, determine V-arrangement face inner bevel a value;
5) according to tiltedly degree of depth L1, V-arrangement face inner bevel a value and selected cutting method carry out slotting in bore diameter B, drilling depth L, the V-arrangement face;
6) after slotting is finished, carry out bursting work.
2. according to the application process of horizontal V-shaped face in the described a kind of tunnel excavation of claim 1, it is characterized in that described V-arrangement face inner bevel a gets 25～40 ° when adopting V-cut; When adopting the straight hole slotting, get 30～50 °.
3. according to the application process of horizontal V-shaped face in the described a kind of tunnel excavation of claim 2, it is characterized in that, described V-arrangement face inner bevel a gets big value when formation hardness height, joint agensis, boring are dark,, joints development low when formation hardness, get the small value when boring is more shallow.
4. according to the application process of horizontal V-shaped face in the described a kind of tunnel excavation of claim 2, it is characterized in that described drilling depth L span is 0.5～0.95B.
5. according to the application process of horizontal V-shaped face in the described a kind of tunnel excavation of claim 2, it is characterized in that oblique degree of depth L in the described V-arrangement face
1=(B/2) tg a.
6. according to the application process of horizontal V-shaped face in the described a kind of tunnel excavation of claim 1, it is characterized in that, described cutting method is when formation hardness f≤8, and hole depth is not subjected to tunnel section when restriction, adopts the wedge type slotting, when the rock densification hard, f〉8, and joint agensis or drilling depth are subjected to tunnel section when restriction, or adopt the wedge type slotting and effect when relatively poor, adopt the straight hole slotting.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100461407A CN101363321A (en) | 2008-09-24 | 2008-09-24 | Application method for horizontal V-shaped tunnel face for digging tunnel |
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| CNA2008100461407A CN101363321A (en) | 2008-09-24 | 2008-09-24 | Application method for horizontal V-shaped tunnel face for digging tunnel |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101967977A (en) * | 2010-08-31 | 2011-02-09 | 中国水电顾问集团华东勘测设计研究院 | Construction method for controlling rock pillar type rock burst in process of double-head tunneling deep-buried tunnel transfixion |
| CN101975065A (en) * | 2010-09-15 | 2011-02-16 | 天地科技股份有限公司 | Method for measuring mining stress of coal mine tunnel |
| CN102226674A (en) * | 2011-05-26 | 2011-10-26 | 中国人民解放军理工大学工程兵工程学院 | Explosion method of dimension stone production in joint development rock |
| CN101769157B (en) * | 2010-01-21 | 2012-01-04 | 广东省长大公路工程有限公司 | Construction method for tunnel working face counterpressure treatment during tunnel excavation |
| CN103791789A (en) * | 2014-01-13 | 2014-05-14 | 河海大学 | Blasting construction method based on certain angle formed between boreholes and joints |
| CN104047609A (en) * | 2014-06-24 | 2014-09-17 | 四川省华蓥山煤业股份有限公司绿水洞煤矿 | Heavy pitch fully mechanized coal mining face open-off cut pilot drilling construction method |
| CN105604554A (en) * | 2015-12-22 | 2016-05-25 | 中国矿业大学 | Method for adjusting end face shapes of coal roadway driving working faces to maintain side and roof stability |
-
2008
- 2008-09-24 CN CNA2008100461407A patent/CN101363321A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769157B (en) * | 2010-01-21 | 2012-01-04 | 广东省长大公路工程有限公司 | Construction method for tunnel working face counterpressure treatment during tunnel excavation |
| CN101967977A (en) * | 2010-08-31 | 2011-02-09 | 中国水电顾问集团华东勘测设计研究院 | Construction method for controlling rock pillar type rock burst in process of double-head tunneling deep-buried tunnel transfixion |
| CN101967977B (en) * | 2010-08-31 | 2012-10-31 | 中国水电顾问集团华东勘测设计研究院 | Construction method for controlling rock pillar type rock burst in process of double-head tunneling deep-buried tunnel transfixion |
| CN101975065A (en) * | 2010-09-15 | 2011-02-16 | 天地科技股份有限公司 | Method for measuring mining stress of coal mine tunnel |
| CN102226674A (en) * | 2011-05-26 | 2011-10-26 | 中国人民解放军理工大学工程兵工程学院 | Explosion method of dimension stone production in joint development rock |
| CN103791789A (en) * | 2014-01-13 | 2014-05-14 | 河海大学 | Blasting construction method based on certain angle formed between boreholes and joints |
| CN103791789B (en) * | 2014-01-13 | 2015-06-03 | 河海大学 | Blasting construction method based on certain angle formed between boreholes and joints |
| CN104047609A (en) * | 2014-06-24 | 2014-09-17 | 四川省华蓥山煤业股份有限公司绿水洞煤矿 | Heavy pitch fully mechanized coal mining face open-off cut pilot drilling construction method |
| CN105604554A (en) * | 2015-12-22 | 2016-05-25 | 中国矿业大学 | Method for adjusting end face shapes of coal roadway driving working faces to maintain side and roof stability |
| CN105604554B (en) * | 2015-12-22 | 2018-04-06 | 中国矿业大学 | A kind of Driving Face in Coal Tunnel end face form that adjusts keeps the stable method in side top |
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Open date: 20090211 |