CN105953670A - Rectangular tunnel full-section blasting excavation construction method - Google Patents
Rectangular tunnel full-section blasting excavation construction method Download PDFInfo
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- CN105953670A CN105953670A CN201610272258.6A CN201610272258A CN105953670A CN 105953670 A CN105953670 A CN 105953670A CN 201610272258 A CN201610272258 A CN 201610272258A CN 105953670 A CN105953670 A CN 105953670A
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- hole
- keyhole
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- blast hole
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Classifications
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- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a rectangular tunnel full-section blasting excavation construction method. The rectangular tunnel full-section blasting excavation construction method comprises the following steps that drilling and blasting are designed through the smooth blasting principle; cut holes, auxiliary holes, smooth blasting holes and encryption smooth blasting holes are sequentially formed from inside to outside and are blasted one by one according to the smooth blasting requirements; and a standard designed rectangular section is formed finally. The rectangular tunnel full-section blasting excavation construction method is applied to construction, except that a rectangular-section tunnel is constructed according to the smooth blasting requirements, gap narrowing measures are taken for the blast holes in the corners, and thus the smooth blasting effect is improved; and on-site quality inspection shows that the formed section size of the rectangular tunnel meets the design requirement, and the rock surface flatness is smaller than the deviation value required by the specification.
Description
Technical field:
The present invention relates to tunnel blasting construction field, particularly relate to a kind of rectangle tunnel full-face blast excavation construction method.
Background technology:
Tunnel is designed as circle, circular arch stalk shape, the shape of a hoof, avette etc. more, and rectangle tunnel is few.Phase is lacked for rectangle tunnel
The construction method answered and construction experience, the stable and safety of the cavern during how ensureing rectangle tunnel excavation is most important, this
Need exist for safe and reliable construction method.
Summary of the invention:
In order to make up prior art problem, it is an object of the invention to provide a kind of rectangle tunnel full-face blast excavation construction side
Method, improves Smooth Blasting Effects, and quality in site inspection shows, rectangle tunnel molding cross dimensions meets design requirement, scar
Flatness is less than the deviation value of code requirement.
Technical scheme is as follows:
Rectangle tunnel full-face blast excavation construction method, it is characterised in that comprise the steps:
1), utilize photoface exploision principle, carry out hole blasting design, be sequentially arranged from the inside to the outside keyhole, via hole, light blast hole and
Encryption light blast hole, requires to detonate one by one according to photoface exploision, ultimately forms the design rectangular cross section of standard；
2), keyhole: keyhole typically should be selected in the weak part of rock, makes full use of the structural plane of rock in section；If
Rock is homogenizing, when using V-cut, is typically located at Section Central；
The inclination angle of keyhole and the scope of operation depending on the hardness of rock and the undermining type of employing, general change 55 ° ~
Between 75 °；
The pitch-row of keyhole can be determined by formula: in B=2c+b formula,
The spacing in B two keyhole aperture；
B two keyhole bottom hole pitch from；
The air line distance at the bottom of c keyhole hole and aperture；
Inclined-hole cut explosive payload calculates: Q=qV/n
Q Cut Blasting lithologic unit volume explosive consumption (kg/m3)；
V vallecular cavity volume (m3)；
N=inclined-hole cut big gun hole count；
According to rectangular cross section feature, using inclined hole big gun hole cutting method, in the middle position of rectangular cross section, longitudinally spaced layout is many
Row keyhole；
3), via hole: via hole includes being centered around keyhole periphery evenly distributed on whole section, mainly includes multi-turn square
The interior via hole of shaped formation, the interior via hole periphery of outmost turns is additionally provided with the outer via hole of two row longitudinal arrangements；
Via hole outmost turns burden W is the 60% ~ 80% of borehole spacing；When using No. 2 rock ammonium-antimony explosives, W value takes 0.6 ~
0.8m；
4), light blast hole: light blast hole along along tunnel periphery and the outside rectangular in form that is arranged in via hole,
Light blast hole dip angle of hole tilts 2 ~ 3 ° laterally along hole wall, and light blast hole boring requirement spacing is uniformly generally 45 ~ 55 cm,
Camber angle is equal, and big gun hole is parallel to each other, and the degree of depth is consistent；
5), encryption light blast hole: encryption light blast hole belongs to light blast hole one class, and encryption light blast hole and light blast hole are together along tunnel perimeter
Surrounding rectangular-shaped, encryption light blast hole is distributed in four corners of rectangle, and each edge is intervally distributed with multiple smooth blast hole, adjacent light
Blast hole spacing is generally 25 ~ 35cm；
6), keyhole, via hole, light blast hole and encryption light blast hole need to be combined according to according to lithology, drilling machine and explosive property etc.
Closing and analyze, aperture is generally 40 ~ 45mm, and the degree of depth is generally 2.0 ~ 3.0m；
7), the calculating of explosive payload and distribution: take following methods to calculate explosive payload, the most first calculate a circulation with cubature formula
Total dosage, is then allocated by the blasting property in various types of big gun holes, then is checked in Blasting Practice and revise,
Until obtaining good demolition effect；
The formula calculating dose Q is
Q=qv
Total dosage of mono-explosion circulation of Q, Kg in formula；
Q explosion 1m3The consumption of rock explosive, Kg/ m3；
Mono-cyclic advance of V quick-fried fall rock cumulative volume, m3；Its value is
V=L.S
Wherein
L plans cyclic advance, m；
S excavation area, m2；
8), blasting sequence: ignite successively according to order from inside to outside.
Described rectangle tunnel full-face blast excavation construction method, it is characterised in that comprise the steps:
1), utilize photoface exploision principle, carry out hole blasting design, be sequentially arranged from the inside to the outside keyhole, via hole, light blast hole and
Encryption light blast hole, requires to detonate one by one according to photoface exploision, ultimately forms the design rectangular cross section of standard；
2), keyhole: keyhole typically should be selected in the weak part of rock, makes full use of the structural plane of rock in section；If
Rock is homogenizing, when using V-cut, is typically located at Section Central；
The inclination angle of keyhole and the scope of operation depending on the hardness of rock and the undermining type of employing, general change 55 ° ~
Between 75 °；
The pitch-row of keyhole, one refers to the orifice distance of every pair of keyhole distance in the scope of operation, and two refer to parallel two
Spacing distance to keyhole, can be determined by formula: in B=2c+b formula,
The spacing in B two keyhole aperture；
B two keyhole bottom hole pitch from；
The air line distance at the bottom of c keyhole hole and aperture；
Inclined-hole cut explosive payload calculates: Q=qV/n
Q Cut Blasting lithologic unit volume explosive consumption (kg/m3)；
V vallecular cavity volume (m3)；
N=inclined-hole cut big gun hole count；
According to rectangular cross section feature, using inclined hole big gun hole cutting method, in the middle position of rectangular cross section, longitudinally spaced layout is many
Row keyhole, generally longitudinal two row, each column interval is disposed with 3 holes；
3), via hole: via hole includes being centered around keyhole periphery evenly distributed on whole section, mainly includes multi-turn square
The interior via hole of shaped formation, the interior via hole periphery of outmost turns is additionally provided with the outer via hole of two row longitudinal arrangements；
Via hole outmost turns burden W is the 60% ~ 80% of borehole spacing；When using No. 2 rock ammonium-antimony explosives, W value takes 0.6 ~
0.8m；
4), light blast hole: light blast hole along along tunnel periphery and the outside rectangular in form that is arranged in via hole,
Light blast hole dip angle of hole tilts 2 ~ 3 ° laterally along hole wall, and light blast hole boring requirement spacing is uniformly generally 50cm, flare
Angle is equal, and big gun hole is parallel to each other, and the degree of depth is consistent；
5), encryption light blast hole: encryption light blast hole belongs to light blast hole one class, and encryption light blast hole and light blast hole are together along tunnel perimeter
Surrounding rectangular-shaped, encryption light blast hole is distributed in four corners of rectangle, and each edge is intervally distributed with multiple smooth blast hole, adjacent light
Blast hole spacing is generally 30cm；
6), keyhole, via hole, light blast hole and encryption light blast hole need to be combined according to according to lithology, drilling machine and explosive property etc.
Closing and analyze, aperture is generally 42mm, and the degree of depth is generally 2.5m；
7), the calculating of explosive payload and distribution: take following methods to calculate explosive payload, the most first calculate a circulation with cubature formula
Total dosage, is then allocated by the blasting property in various types of big gun holes, then is checked in Blasting Practice and revise,
Until obtaining good demolition effect；
The formula calculating dose Q is
Q=qv
Total dosage of mono-explosion circulation of Q, Kg in formula；
Q explosion 1m3The consumption of rock explosive, Kg/ m3；
Mono-cyclic advance of V quick-fried fall rock cumulative volume, m3；Its value is
V=L.S
Wherein
L plans cyclic advance, m；
S excavation area, m2；
8), blasting sequence: ignite successively according to order from inside to outside.
The invention have the advantage that
1, the present invention is with photoface exploision as principle, arranges big gun hole with rectangular cross section custom design, takes first burn cut hole, the most quick-fried
Broken via hole, the sequence of construction of last explosion light blast hole, due to the pattern that rectangular cross section is special, each corner must be arranged and add
Close smooth blast hole, to improve the blasting quality of rectangular cross section；
2, present invention process is applied in construction, and rectangular cross section tunnel molding cross dimensions meets design requirement, the wall after explosion
Face is smooth, meets quality inspection requirement.
Accompanying drawing illustrates:
Fig. 1 is the Excavation Blasting process schematic representation of the present invention.
Detailed description of the invention:
See accompanying drawing:
Rectangle tunnel full-face blast excavation construction method, comprises the steps:
1), utilize photoface exploision principle, carry out hole blasting design, be sequentially arranged from the inside to the outside keyhole, via hole, light blast hole and
Encryption light blast hole, requires to detonate one by one according to photoface exploision, ultimately forms the design rectangular cross section of standard；
2), keyhole: keyhole typically should be selected in the weak part of rock, makes full use of the structural plane of rock in section；If
Rock is homogenizing, when using V-cut, is typically located at Section Central；
The inclination angle of keyhole and the scope of operation depending on the hardness of rock and the undermining type of employing, general change 55 ° ~
Between 75 °；
The pitch-row of keyhole can be determined by formula: in B=2c+b formula,
The spacing in B two keyhole aperture；
B two keyhole bottom hole pitch from；
The air line distance at the bottom of c keyhole hole and aperture；
Inclined-hole cut explosive payload calculates: Q=qV/n
Q Cut Blasting lithologic unit volume explosive consumption (kg/m3)；
V vallecular cavity volume (m3)；
N=inclined-hole cut big gun hole count；
According to rectangular cross section feature, using inclined hole big gun hole cutting method, in the middle position of rectangular cross section, longitudinally spaced layout is many
Row keyhole；
3), via hole: via hole includes being centered around keyhole periphery evenly distributed on whole section, mainly includes multi-turn square
The interior via hole of shaped formation, the interior via hole periphery of outmost turns is additionally provided with the outer via hole of two row longitudinal arrangements；
Via hole outmost turns burden W is the 60% ~ 80% of borehole spacing；When using No. 2 rock ammonium-antimony explosives, W value takes 0.6 ~
0.8m；
4), light blast hole: light blast hole along along tunnel periphery and the outside rectangular in form that is arranged in via hole,
Light blast hole dip angle of hole tilts 2 ~ 3 ° laterally along hole wall, and light blast hole boring requirement spacing is uniformly generally 45 ~ 55 cm,
Camber angle is equal, and big gun hole is parallel to each other, and the degree of depth is consistent；
5), encryption light blast hole: encryption light blast hole belongs to light blast hole one class, and encryption light blast hole and light blast hole are together along tunnel perimeter
Surrounding rectangular-shaped, encryption light blast hole is distributed in four corners of rectangle, and each edge is intervally distributed with multiple smooth blast hole, adjacent light
Blast hole spacing is generally 25 ~ 35cm；
6), keyhole, via hole, light blast hole and encryption light blast hole need to be combined according to according to lithology, drilling machine and explosive property etc.
Closing and analyze, aperture is generally 40 ~ 45mm, and the degree of depth is generally 2.0 ~ 3.0m；
7), the calculating of explosive payload and distribution: take following methods to calculate explosive payload, the most first calculate a circulation with cubature formula
Total dosage, is then allocated by the blasting property in various types of big gun holes, then is checked in Blasting Practice and revise,
Until obtaining good demolition effect；
The formula calculating dose Q is
Q=qv
Total dosage of mono-explosion circulation of Q, Kg in formula；
Q explosion 1m3The consumption of rock explosive, Kg/ m3；
Mono-cyclic advance of V quick-fried fall rock cumulative volume, m3；Its value is
V=L.S
Wherein
L plans cyclic advance, m；
S excavation area, m2；
8), blasting sequence: ignite successively according to order from inside to outside.
In specific implementation process:
Rectangle tunnel full-face blast excavation construction method, comprises the steps: to utilize photoface exploision principle, carries out boring quick-fried setting
Meter, has been sequentially arranged keyhole, via hole, light blast hole and encryption light blast hole from the inside to the outside, has required to rise one by one according to photoface exploision
Quick-fried, ultimately form the design rectangular cross section of standard；
1, design big gun hole site and aperture: according to rectangle tunnel size, determine each steel for shot position, see accompanying drawing.Big gun hole is straight
The smooth degree of rock drilling productivity ratio, big gun number of perforations, unit powder consumption and hole wall is all had an impact by footpath.Must be according to lithology, boring
Machinery and explosive property etc. are comprehensive to be analyzed, reasonable selection aperture.Through test, the blasthole diameter of Rectangular Tunnel is optimal with 42mm.
2, blast hole depth
According to parameters such as rectangular cross section size, machine drilling efficiency, explosive properties, tests determined blast hole depth with 2.5m is
Preferably.
3, steel for shot
(1) layout of keyhole
Keyhole is the hole first detonated in section, and its Kong Weiying is selected in the weak part of rock, in section to be made full use of
The structural plane of rock.If rock is homogenizing, when using V-cut, it is typically located at Section Central.
The inclination angle of keyhole and the scope of operation is the key that keyhole is arranged, its hardness according to rock and the slotting of employing
Depending on form.Typically change between 55 ° ~ 75 °.
The pitch-row of keyhole (orifice distance (distance in the scope of operation) referring to every pair of keyhole, two refer to parallel
The spacing distance of two pairs of keyholes) can be determined by following formula:
B=2c+b
In formula
The spacing in B two keyhole aperture
B two keyhole bottom hole pitch from
The air line distance at the bottom of c keyhole hole and aperture
Inclined-hole cut explosive payload calculates:
Q=qV/n
Q Cut Blasting lithologic unit volume explosive consumption (kg/m3);
V vallecular cavity volume (m3);
N=inclined-hole cut big gun hole count.
According to rectangular cross section feature, use inclined hole big gun hole cutting method, arrange that in the middle position of rectangular cross section two row are drawn
Slotted eye, each row arrange 3 holes.
(2) layout of via hole
Via hole arrange borehole spacing and the problem of minimum burden of mainly solving, burden W be borehole spacing 60% ~
80%, and evenly distributed on whole section.When using No. 2 rock ammonium-antimony explosives, W value takes 0.6 ~ 0.8m.
(3) layout of light blast hole
Light blast hole arranges boring along tunnel periphery, and dip angle of hole tilts 2 ~ 3 ° laterally along hole wall and (is easy to subsequent cycle boring cloth
Put and implement)；Light blast hole boring requirement spacing uniformly meets setting, and camber angle is equal, and big gun hole is parallel to each other, and the degree of depth is consistent.
Encryption light blast hole: due to the sectional form that rectangle is special, four corners of rectangle easily produce stress and concentrate existing
As, it is easy to during explosion destroy peripheral rock, it is difficult to form the rectangular cross section of standard.For improving rectangular cross section tunnel blasting effect
Really, encryption light blast hole must be arranged in each corner, and 3 the encryption blasting hole spacing being close to four corners must be little
In general light blast hole spacing, it is advisable with 30cm.
Rectangular cross section photoface exploision hole design parameter see table:
Table 1 rectangular cross section photoface exploision hole design parameter catalog
| Aperture (mm) | Spacing (cm) | Powder stick diameter (mm) | Explosive charge (g/m) |
| 42 | 3 encryption blasting hole spacing of four corners of 50(next-door neighbour are 30cm) | 20 | 200~250 |
4, the calculating of explosive payload and distribution
Reasonably dose should be according to the performance of the explosive used and quality, geological conditions, excavated section size, free face number
Total dosage of amount, blasthole diameter and the degree of depth and circulation requires to determine.Take following methods to calculate explosive payload, the most first use volume
Formula calculates total dosage of a circulation, is then allocated by the blasting property in various types of big gun holes, more real in explosion
Checked in trampling and revised, until obtaining good demolition effect.The formula calculating dose Q is
Q=qv
Total dosage of mono-explosion circulation of Q, Kg in formula;
Q explosion 1m3The consumption of rock explosive, Kg/ m3,
Mono-cyclic advance of V quick-fried fall rock cumulative volume, m3, its value is
V=L.S
Wherein
L plans cyclic advance, m；
S excavation area, m2。
5, blasting sequence is: by number order in figure, i.e. 12345.
Present invention process is applied in construction, rectangular cross section tunnel except according to photoface exploision require construction in addition to, corner
Big gun hole take to reduce spacing measure, improve Smooth Blasting Effects, quality in site inspection shows, rectangle tunnel molding section chi
Very little meeting design requirement, scar flatness is less than the deviation value of code requirement.
Claims (2)
1. a rectangle tunnel full-face blast excavation construction method, it is characterised in that comprise the steps:
1), utilize photoface exploision principle, carry out hole blasting design, be sequentially arranged from the inside to the outside keyhole, via hole, light blast hole and
Encryption light blast hole, requires to detonate one by one according to photoface exploision, ultimately forms the design rectangular cross section of standard；
2), keyhole: keyhole typically should be selected in the weak part of rock, makes full use of the structural plane of rock in section；If
Rock is homogenizing, when using V-cut, is typically located at Section Central；
The inclination angle of keyhole and the scope of operation depending on the hardness of rock and the undermining type of employing, general change 55 ° ~
Between 75 °；
The pitch-row of keyhole can be determined by formula: in B=2c+b formula,
The spacing in B two keyhole aperture；
B two keyhole bottom hole pitch from；
The air line distance at the bottom of c keyhole hole and aperture；
Inclined-hole cut explosive payload calculates: Q=qV/n
Q Cut Blasting lithologic unit volume explosive consumption (kg/m3)；
V vallecular cavity volume (m3)；
N=inclined-hole cut big gun hole count；
According to rectangular cross section feature, using inclined hole big gun hole cutting method, in the middle position of rectangular cross section, longitudinally spaced layout is many
Row keyhole；
3), via hole: via hole includes being centered around keyhole periphery evenly distributed on whole section, mainly includes multi-turn square
The interior via hole of shaped formation, the interior via hole periphery of outmost turns is additionally provided with the outer via hole of two row longitudinal arrangements；
Via hole outmost turns burden W is the 60% ~ 80% of borehole spacing；When using No. 2 rock ammonium-antimony explosives, W value takes 0.6 ~
0.8m；
4), light blast hole: light blast hole along along tunnel periphery and the outside rectangular in form that is arranged in via hole,
Light blast hole dip angle of hole tilts 2 ~ 3 ° laterally along hole wall, and light blast hole boring requirement spacing is uniformly generally 45 ~ 55 cm,
Camber angle is equal, and big gun hole is parallel to each other, and the degree of depth is consistent；
5), encryption light blast hole: encryption light blast hole belongs to light blast hole one class, and encryption light blast hole and light blast hole are together along tunnel perimeter
Surrounding rectangular-shaped, encryption light blast hole is distributed in four corners of rectangle, and each edge is intervally distributed with multiple smooth blast hole, adjacent light
Blast hole spacing is generally 25 ~ 35cm；
6), keyhole, via hole, light blast hole and encryption light blast hole need to be according to total scores such as lithology, drilling machine and explosive properties
Analysis, aperture is generally 40 ~ 45mm, and the degree of depth is generally 2.0 ~ 3.0m；
7), the calculating of explosive payload and distribution: take following methods to calculate explosive payload, the most first calculate a circulation with cubature formula
Total dosage, is then allocated by the blasting property in various types of big gun holes, then is checked in Blasting Practice and revise,
Until obtaining good demolition effect；
The formula calculating dose Q is
Q=qv
Total dosage of mono-explosion circulation of Q, Kg in formula；
Q explosion 1m3The consumption of rock explosive, Kg/ m3；
Mono-cyclic advance of V quick-fried fall rock cumulative volume, m3；Its value is
V=L.S
Wherein
L plans cyclic advance, m；
S excavation area, m2；
8), blasting sequence: ignite successively according to order from inside to outside.
Rectangle tunnel full-face blast excavation construction method the most according to claim 1, it is characterised in that include walking as follows
Rapid:
1), utilize photoface exploision principle, carry out hole blasting design, be sequentially arranged from the inside to the outside keyhole, via hole, light blast hole and
Encryption light blast hole, requires to detonate one by one according to photoface exploision, ultimately forms the design rectangular cross section of standard；
2), keyhole: keyhole typically should be selected in the weak part of rock, makes full use of the structural plane of rock in section；If
Rock is homogenizing, when using V-cut, is typically located at Section Central；
The inclination angle of keyhole and the scope of operation depending on the hardness of rock and the undermining type of employing, general change 55 ° ~
Between 75 °；
The pitch-row of keyhole, one refers to the orifice distance of every pair of keyhole distance in the scope of operation, and two refer to parallel two
Spacing distance to keyhole, can be determined by formula: in B=2c+b formula,
The spacing in B two keyhole aperture；
B two keyhole bottom hole pitch from；
The air line distance at the bottom of c keyhole hole and aperture；
Inclined-hole cut explosive payload calculates: Q=qV/n
Q Cut Blasting lithologic unit volume explosive consumption (kg/m3)；
V vallecular cavity volume (m3)；
N=inclined-hole cut big gun hole count；
According to rectangular cross section feature, using inclined hole big gun hole cutting method, in the middle position of rectangular cross section, longitudinally spaced layout is many
Row keyhole, generally longitudinal two row, each column interval is disposed with 3 holes；
3), via hole: via hole includes being centered around keyhole periphery evenly distributed on whole section, mainly includes multi-turn square
The interior via hole of shaped formation, the interior via hole periphery of outmost turns is additionally provided with the outer via hole of two row longitudinal arrangements；
Via hole outmost turns burden W is the 60% ~ 80% of borehole spacing；When using No. 2 rock ammonium-antimony explosives, W value takes 0.6 ~
0.8m；
4), light blast hole: light blast hole along along tunnel periphery and the outside rectangular in form that is arranged in via hole,
Light blast hole dip angle of hole tilts 2 ~ 3 ° laterally along hole wall, and light blast hole boring requirement spacing is uniformly generally 50cm, flare
Angle is equal, and big gun hole is parallel to each other, and the degree of depth is consistent；
5), encryption light blast hole: encryption light blast hole belongs to light blast hole one class, and encryption light blast hole and light blast hole are together along tunnel perimeter
Surrounding rectangular-shaped, encryption light blast hole is distributed in four corners of rectangle, and each edge is intervally distributed with multiple smooth blast hole, adjacent light
Blast hole spacing is generally 30cm；
6), keyhole, via hole, light blast hole and encryption light blast hole need to be combined according to according to lithology, drilling machine and explosive property etc.
Closing and analyze, aperture is generally 42mm, and the degree of depth is generally 2.5m；
7), the calculating of explosive payload and distribution: take following methods to calculate explosive payload, the most first calculate a circulation with cubature formula
Total dosage, is then allocated by the blasting property in various types of big gun holes, then is checked in Blasting Practice and revise,
Until obtaining good demolition effect；
The formula calculating dose Q is
Q=qv
Total dosage of mono-explosion circulation of Q, Kg in formula；
Q explosion 1m3The consumption of rock explosive, Kg/ m3；
Mono-cyclic advance of V quick-fried fall rock cumulative volume, m3；Its value is
V=L.S
Wherein
L plans cyclic advance, m；
S excavation area, m2；
8), blasting sequence: ignite successively according to order from inside to outside.
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| CN201610272258.6A CN105953670A (en) | 2016-04-27 | 2016-04-27 | Rectangular tunnel full-section blasting excavation construction method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106403740A (en) * | 2016-11-25 | 2017-02-15 | 葛洲坝易普力四川爆破工程有限公司 | Method for accurately controlling direction of obliquely downward smooth blasting hole in excavating of structural surface |
| CN107218860A (en) * | 2017-06-26 | 2017-09-29 | 国家电网公司 | A kind of blasting method of IV class surrounding rocks tunnel smooth surface |
| CN109630132A (en) * | 2018-11-21 | 2019-04-16 | 中铁十二局集团有限公司 | Round jacked piles with small section outline excavation controls construction method |
| CN110595305A (en) * | 2019-08-08 | 2019-12-20 | 中铁二局第二工程有限公司 | Wave crest uncorrelated detonation method |
| CN113405417A (en) * | 2021-07-21 | 2021-09-17 | 四川公路桥梁建设集团有限公司 | Novel smooth blasting method suitable for unevenly broken rock mass |
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| CN110595305A (en) * | 2019-08-08 | 2019-12-20 | 中铁二局第二工程有限公司 | Wave crest uncorrelated detonation method |
| CN110595305B (en) * | 2019-08-08 | 2021-07-30 | 中铁二局第二工程有限公司 | Wave crest uncorrelated detonation method |
| CN113405417A (en) * | 2021-07-21 | 2021-09-17 | 四川公路桥梁建设集团有限公司 | Novel smooth blasting method suitable for unevenly broken rock mass |
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