CN107289827A - The bilateral V-cut sinking and blasting method of Super-large-section tunnel - Google Patents
The bilateral V-cut sinking and blasting method of Super-large-section tunnel Download PDFInfo
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- CN107289827A CN107289827A CN201710685596.7A CN201710685596A CN107289827A CN 107289827 A CN107289827 A CN 107289827A CN 201710685596 A CN201710685596 A CN 201710685596A CN 107289827 A CN107289827 A CN 107289827A
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- cut
- snubber
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- top bar
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
Abstract
It is that Super-large-section tunnel to be excavated is divided into top bar and got out of a predicament or an embarrassing situation to be constructed the invention discloses a kind of bilateral V-cut sinking and blasting method of Super-large-section tunnel；Excavated for tunnel top bar Mining in Rock Mass to be excavated with the method for bilateral V-cut and segmentation millisecond delay explosion, bilateral V-cut refers to be arranged symmetrically both sides slotting region in the middle and lower part of top bar face center line both sides, each slotting region is the wedge shaped vertical cylindrical region of flat shape, the vallecular cavity of Cut Blasting formation is provided enough broken swollen spaces for follow-up all kinds of hole firings；Segmentation millisecond delay refers to the detonation for setting millisecond delay explosion to carry out all kinds of boreholes between row, has efficiency to improve the utilization rate of all kinds of boreholes, it is ensured that design drilling depth.
Description
Technical field
The invention belongs to rock mass in tunnel sinking and blasting field of engineering technology, more particularly, to extra-large cross-section mountain tunnel
Excavation Blasting.
Background technology
Because of the limitation of the conditions such as landform and line alignment, to meet current requirement during the roomy road crossing mountain ridge, tunnel breaks
Face area will often reach 100m2More than, belong to Super-large-section tunnel；Drilling and blasting method is dug as the most economic and efficient Rock Tunnel
Enter method, be just widely used at present among the excavation in all kinds of ground tunnels driving；For large cross-section tunnel and extra-large cross-section tunnel
The mode that road uses centre cut at present carries out Blasting Excavation.
In view of typically only having a scope of freedom during Upon Blasting for Tunnel Driving excavation, it is unfavorable for the broken of rock mass in tunnel and opens
Dig, therefore, it is necessary in setting snubber on tunnel excavation face, and detonated prior to other type boreholes, think other
Rock mass broken swollen offer sufficient space during follow-up hole firing.The mode of currently employed centre cut is attached in section center
Closely one slotting region of arrangement, but only arrange that a centre cut region can not be provided enough when tunnel excavation section is excessive
The broken swollen space of rock mass, cause to jump eye and periphery hole explosion when rock mass clamping action increase, blast hole utilizing factor reduction, it is difficult to
Design cycle drilling depth is reached, is easily caused that the constructing tunnel duration is delayed, constructing tunnel engineering cost will be significantly increased.
The content of the invention
The present invention is not enough wedge-shaped there is provided a kind of bilateral of Super-large-section tunnel present in above-mentioned prior art to avoid
Slotting sinking and blasting method, to form sufficiently large cavity for Super-large-section tunnel, it is to avoid the explosion folder such as follow-up reliever
Making increases, and improves blast hole utilization factor low, it is ensured that design drilling depth.
The present invention adopts the following technical scheme that to solve technical problem：
The characteristics of bilateral V-cut sinking and blasting method of Super-large-section tunnel of the present invention is：Will extra-large cross-section be excavated
Tunnel is divided into top bar and got out of a predicament or an embarrassing situation and constructed；For top bar Mining in Rock Mass to be excavated in tunnel is with bilateral V-cut and divides
The method of section millisecond delay explosion is excavated, and the bilateral V-cut refers in top bar face center line both sides
Bottom is arranged symmetrically both sides slotting region, and each slotting region is the wedge shaped vertical cylindrical region of flat shape, makes Cut Blasting
The vallecular cavity of formation can provide enough broken swollen spaces for follow-up all kinds of hole firings；The segmentation millisecond delay refers between row
Set millisecond delay explosion to carry out the detonation of all kinds of boreholes, improve the utilization rate of all kinds of boreholes.
The characteristics of bilateral V-cut sinking and blasting method of Super-large-section tunnel of the present invention, lies also in：Both sides slotting is set
The snubber in region is symmetrical with tunnel center, and the slotting center in each slotting region is 4.0- with the horizontal range of tunnel center line
4.5m, angle is 60 ° -65 ° between snubber and face；It is disposed adjacent in the outside in slotting region with snubber as auxiliary slotting
Eye, angle is 65 ° -80 ° between the auxiliary snubber and face；The angle in periphery hole and outline excavation face is 2 °, periphery hole
Eyeground is fallen within the outside of outline excavation face, and clear distance control between the two is not more than 0.1m；In periphery hole and neighbouring auxiliary snubber
Between reliever is set, be also equipped with reliever between two slotting regions, top bar base set bottom plate eye, it is each auxiliary
Eye and bottom plate eye is helped to be drilled with perpendicular to face；The snubber, auxiliary snubber, reliever and periphery hole it is each it is comfortable vertical into
Row is set, and the bottom plate eye is set in a row along the base of top bar.
The characteristics of bilateral V-cut sinking and blasting method of Super-large-section tunnel of the present invention, lies also in：Firing order is set
For：It is snubber first；Then it is followed successively by auxiliary snubber and reliever；It is afterwards again bottom plate eye, and without two side wall positions
The bottom plate eye at place；It is finally periphery hole, and the eye of the bottom plate comprising two side wall positions.
The characteristics of bilateral V-cut sinking and blasting method of Super-large-section tunnel of the present invention, lies also in：The snubber,
Delay is not less than 50ms between row when auxiliary snubber, reliever, bottom plate eye respectively queue quick-fried, between periphery hole and last detonation borehole
Delay is not less than 100ms.
The characteristics of bilateral V-cut sinking and blasting method of Super-large-section tunnel of the present invention, lies also in：The snubber,
Snubber, reliever and bottom plate eye is aided in use continuous charging structure, detonator is using millisecond delay detonating detonator in big gun
Eyeground portion is reversely ignited.
The characteristics of bilateral V-cut sinking and blasting method of Super-large-section tunnel of the present invention, lies also in：The periphery hole is adopted
Axial decoupling charge structure is used, powder stick is cut into 4-5cm each trifle vertically, and adjacent trifle is put with 40-50cm interval
Enter in periphery hole, explosive is detonated using primacord in periphery hole, primacord is quick-fried with main conduction outside aperture in each periphery hole
Rope is connected in " T " and carries out propagation of explosion, and detonating capsule is arranged on main biography primacord.
The characteristics of bilateral V-cut sinking and blasting method of Super-large-section tunnel of the present invention, lies also in：For drawing for step
It is to determine up/down steps interface on Super-large-section tunnel to be excavated first to divide, and is marked off using up/down steps interface
Bench excavation area and excavation area of getting out of a predicament or an embarrassing situation, with this determination top bar outline excavation and outline excavation of getting out of a predicament or an embarrassing situation.
The characteristics of bilateral V-cut sinking and blasting method of Super-large-section tunnel of the present invention, lies also in：Appeared on the stage for described
Rank outline excavation carries out photoface exploision, for the excavation area of getting out of a predicament or an embarrassing situation using horizontal shallow hole kerf blasting, is left office for described
Rank outline excavation carries out photoface exploision.
Compared with the prior art, the present invention has the beneficial effect that：
The present invention can effectively prevent in Super-large-section tunnel blasting process because Excavation blasting rock mass side amount is excessive and nothing
Method reaches that drilling depth is excavated in design, while when being excavated for Super-large-section tunnel rock blasting, can ensure that can form during Cut Blasting
Slotting cavity with enough volumes, provides enough rock mass broken swollen space for follow-up hole firing, effectively improves borehole utilization
The integrality and self-stable ability of rate and tunnel surrounding, effectively improve constructing tunnel efficiency, reduce construction cost.
Brief description of the drawings
Fig. 1 is applied to top bar and elevational schematic of getting out of a predicament or an embarrassing situation when Super-large-section tunnel is excavated for the present invention；
Fig. 2 is applied to top bar and sectional schematic diagram of getting out of a predicament or an embarrassing situation when Super-large-section tunnel is excavated for the present invention；
Borehole arranges elevational schematic view when Fig. 3 is applied to Super-large-section tunnel sinking and blasting for the present invention；
Borehole arranges diagrammatic cross-section when Fig. 4 is applied to Super-large-section tunnel sinking and blasting for the present invention；
Fig. 5 is that the present invention is applied to blashole charge schematic diagram during Super-large-section tunnel sinking and blasting；
Fig. 6 is that the present invention is applied to borehole firing order schematic diagram during Super-large-section tunnel sinking and blasting；
Fig. 7 is that the present invention is applied to periphery photoface exploision eye charge constitution schematic diagram during Super-large-section tunnel sinking and blasting；
Label in figure：11 top bar excavation areas, 12 get out of a predicament or an embarrassing situation excavation area, 13 top bar faces, and 14 get out of a predicament or an embarrassing situation face,
15 up/down steps interfaces, 21 top bar outline excavations, 22 get out of a predicament or an embarrassing situation outline excavation, 30 snubbers, 31 auxiliary snubbers, and 32 is auxiliary
Eye is helped, 33 bottom plates eye, 34 periphery holes, 40 snubbers block section, and 41 snubber powder charges section, 42 auxiliary snubbers block section, and 43 is auxiliary
Snubber powder charge section is helped, 44 relievers block section, and 45 reliever powder charges section, 50 main biography primacords, 51 powder sticks are led in 52 boreholes quick-fried
Rope, 53 detonating capsules, 54 periphery holes block section.
Embodiment
The bilateral V-cut sinking and blasting method of Super-large-section tunnel is in the present embodiment：
As depicted in figs. 1 and 2, Super-large-section tunnel to be excavated is divided into top bar and got out of a predicament or an embarrassing situation and constructed, for
The division of step is to determine up/down steps interface 15 on Super-large-section tunnel to be excavated first, is demarcated using up/down steps
Face 15 marks off top bar excavation area 11 and excavation area 12 of getting out of a predicament or an embarrassing situation, with this determination top bar outline excavation 21 and excavation of getting out of a predicament or an embarrassing situation
Profile 22；Wherein, top bar is highly 7-9m, and height of getting out of a predicament or an embarrassing situation is not less than 4.5m, top bar face 13 and area of getting out of a predicament or an embarrassing situation
20m is pulled open between face 14, wall rock condition, supporting condition and construction level etc. are regarded in specific implementation and carries out structure adjusting.
Carried out for tunnel top bar Mining in Rock Mass to be excavated with the method for bilateral V-cut and segmentation millisecond delay explosion
Excavate, the bilateral V-cut refers to be arranged symmetrically both sides slotting area in the middle and lower part of top bar face center line both sides
Domain, each slotting region is the wedge shaped vertical cylindrical region of flat shape, and the vallecular cavity for enabling Cut Blasting formation is follow-up each
Class hole firing provides enough broken swollen spaces；The segmentation millisecond delay refers to set millisecond delay explosion to carry out respectively between row
The detonation of class borehole, improves the utilization rate of all kinds of boreholes, reduces the not enough negative effect to Upon Blasting for Tunnel Driving of detonator section, from
And tunnel single explosion cyclic advance is improved, weaken because vibrating negative effect caused by detonator section lazy weight, improve tunnel
Road surrounding rock stability, it is ensured that constructing tunnel is smoothed out, and is conducive to controlling and is reduced constructing tunnel cost.
Referring to Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the snubber 30 in both sides slotting region is set to be symmetrical with tunnel center, each slotting
The slotting center in region and the horizontal range of tunnel center line are 4.0-4.5m, between snubber 30 and face angle be 60 °-
65°；It is disposed adjacent in the outside in slotting region with snubber as auxiliary snubber 31, angle between auxiliary snubber 31 and face
For 65 ° -80 °；The angle in periphery hole 34 and outline excavation face is 2 °, and periphery hole eyeground is fallen within the outside of outline excavation face, and both
Between clear distance control be not more than 0.1m；Multiple rows of reliever 32 is set between periphery hole 34 and neighbouring auxiliary snubber 31, two
Reliever 31 is also equipped between individual slotting region, bottom plate eye 33, each reliever 32 and bottom plate eye are set on the base of top bar
33 are drilled with perpendicular to face；Snubber 30, auxiliary snubber 31, reliever 32 and each leisure of periphery hole 34 are vertically in a row set
Put, bottom plate eye 33 along the base of top bar into one it is single set；Because top bar face is arcuate surface, in top bar face
Middle and upper part position at be additionally provided with multiple rows of top reliever 35.
Set firing order be：It is snubber 30 first；Then it is followed successively by and aids in snubber 31, reliever 32, top auxiliary
Help eye 35；It is afterwards again bottom plate eye 33, and without the bottom plate eye at two side wall positions；It is finally periphery hole 34, and includes both sides
The bottom plate eye of abutment wall position；The firing order of each row's reliever 32 is progressively detonated by slotting regional center towards periphery；On each row
The firing order of portion's reliever 35 is progressively detonated by the centrally directed periphery of top bar face, the row top reliever of the bottom one and
The row's reliever of outermost one detonates simultaneously, 1., 2., 3., 4., 5., 6., 7., 8. and to be 9. sequentially characterized as each blasthole in Fig. 6
Firing order.
Delay is not less than 50ms, periphery between being arranged when setting snubber, auxiliary snubber, reliever, bottom plate eye respectively to queue quick-fried
Delay between eye and last detonation borehole is not less than 100ms；Photoface exploision is carried out for top bar outline excavation 21, for leaving office
Rank excavation area 12 uses horizontal shallow hole kerf blasting, and for getting out of a predicament or an embarrassing situation, outline excavation 22 carries out photoface exploision.
In specific implementation, the cyclic advance 3.0-3.5m of Tunnel Blasting is set；
The depth of snubber is compared with cyclic advance depth 20-30cm, snubber array pitch 45cm-55cm, and snubber eyeground is away from 20-
30cm, snubber eye mouth is away from 4.0-5.0m；The depth of snubber is aided in compared with cyclic advance depth 20-30cm；Periphery hole eye mouth is located at
On tunnel excavation border, periphery hole eyeground is deeply consistent with cyclic advance away from border 10-15cm, periphery hole is excavated, periphery hole eye
Spacing 0.45-0.55m, the quick-fried thickness degree 0.6-0.8m of periphery eye；Bottom plate eye eye mouthful is located at tunnel top bar and boundary of getting out of a predicament or an embarrassing situation
On face, bottom plate eye eyeground is away from away from excavation border 10-15cm, bottom plate eye spacing 1.0-1.1m, explosion thickness 0.9-1.1m；Reliever
Spacing 0.9-1.1m, reliever array pitch 0.8-1.0m.
As shown in Figure 4 and Figure 5, snubber, auxiliary snubber, reliever and bottom plate eye are filled using continuous in the present embodiment
Medicine structure, borehole diameter is 40-42mm, and powder stick is No. 2 rock emulsion explosives that specification is φ 32mm × 300mm, aperture big gun
Mud is clogged, and detonator detonator is arranged at borehole bottom, and detonator is carried out anti-using millisecond delay detonating detonator in borehole bottom
To ignition；Snubber powder charge section 40 shown in Fig. 4 in each snubber blocks section 41 by snubber and blocked；Each auxiliary slotting
Auxiliary snubber powder charge section 43 is to block section 42 by auxiliary snubber to be blocked in eye；Reliever powder charge section 45 in each reliever
It is to block section 44 by reliever to be blocked.
As shown in fig. 7, in the present embodiment periphery hole using axial decoupling charge structure, powder stick be specification for φ 32mm ×
300mm No. 2 rock emulsion explosives, by primacord, peripherally eye total length is put into and leaves 40-50cm in aperture, will using sharp knife
Powder stick is cut into 4-5cm each trifle vertically, and adjacent trifle is put into periphery hole with 40-50cm intervals, longitudinal not coupled systemes
Number is that explosive is detonated using primacord in 5.8-6.0, periphery hole, i.e., be evenly distributedly bundled in borehole powder stick 51 and lead
On quick-fried rope 52, primacord 52 is connected in " T " with main biography primacord 50 outside aperture and carries out propagation of explosion, detonating capsule in each periphery hole
53 are arranged on main biography primacord 50, and it is the stemming no less than 40cm that periphery hole, which blocks section 54,.
The present invention is carried out as follows for Super-large-section tunnel tunneling construction：
Step 1：According to tunnel excavation section, tunnel top bar excavation area 11 and top bar outline excavation 21 are determined, and
Get out of a predicament or an embarrassing situation and excavation area 12 and get out of a predicament or an embarrassing situation outline excavation 22；
Step 2：Millisecond time-delay sinking and blasting between eye is carried out in top bar excavation area, border is excavated to top bar and carries out smooth surface
Explosion；
Step 3：After the completion of excavation of getting out of a predicament or an embarrassing situation, horizontal shallow hole kerf blasting is carried out and to leaving office for excavation area of getting out of a predicament or an embarrassing situation
Carry out photoface exploision in rank border.
The inventive method forms effective slotting cavity when Cut Blasting can be effectively ensured, rock mass is broken when being ensuing blast
It is swollen that enough expansion spaces are provided, the integrality and self-stable ability of all kinds of blast hole utilization factors and tunnel surrounding are improved, tunnel is added
Road single sinking and blasting drilling depth, improves constructing tunnel efficiency and reduces construction cost.The inventive method is successfully used in
Ji South 2nd Ring Road South Road east is prolonged among the construction in main projects pulp-water spring tunnel of engineering, left tunnel line total length 3101m, Tunnel Right
Line total length 3085.4m, unilateral tunnel is designed by Four-Lane Road, maximum excavation width 19.8m, and excavation height reaches 12.95m, is excavated disconnected
Face area is 208.43-219.78m2, wherein top bar excavation height is about 8.2m, and excavated section area is about 121m2.Barrel
Penetrating ground is mainly upper Pleistocene series silty clay, the Ordovician system and Cambrian limestone, dolomitic limestone and biocalcarenite, is enclosed
Riedel-treppe is not divided into III grade, IV grade, V grade of country rock, and tunnel uses separate structure pattern, and left and right width is at a distance of about 14-31m.Using
The inventive method progress pulp-water spring Super-large-section tunnel construction, it is 3.5m that drilling depth is excavated in design, and quick-fried rear actual measurement drilling depth reaches
3.36m, borehole effective rate of utilization reaches more than 96%, and tunnel surrounding is relatively smooth smooth after explosion, and quick-fried clinker degree is more equal
It is even to be beneficial to shipment.
Claims (8)
1. the bilateral V-cut sinking and blasting method of Super-large-section tunnel, it is characterized in that：
Super-large-section tunnel to be excavated is divided into top bar and getting out of a predicament or an embarrassing situation and constructed；
Excavated for tunnel top bar Mining in Rock Mass to be excavated with the method for bilateral V-cut and segmentation millisecond delay explosion,
The bilateral V-cut refers to be arranged symmetrically both sides slotting region in the middle and lower part of top bar face center line both sides, respectively drawn
Groove region is the wedge shaped vertical cylindrical region of flat shape, and the vallecular cavity for enabling Cut Blasting formation is that follow-up all kinds of boreholes are quick-fried
It is broken that enough broken swollen spaces are provided；The segmentation millisecond delay refers to set millisecond delay explosion to carry out all kinds of boreholes between row
Detonation, improves the utilization rate of all kinds of boreholes.
2. the bilateral V-cut sinking and blasting method of Super-large-section tunnel according to claim 1, it is characterized in that：Set
The snubber in both sides slotting region is symmetrical with tunnel center, the slotting center in each slotting region and the horizontal range of tunnel center line
For 4.0-4.5m, angle is 60 ° -65 ° between snubber and face；Supplemented by being disposed adjacent in the outside in slotting region with snubber
Snubber is helped, angle is 65 ° -80 ° between the auxiliary snubber and face；The angle in periphery hole and outline excavation face is 2 °,
Periphery hole eyeground is fallen within the outside of outline excavation face, and clear distance control between the two is not more than 0.1m；In periphery hole and neighbouring auxiliary
Reliever is set between snubber, reliever is also equipped between two slotting regions, bottom plate is set on the base of top bar
Eye, each reliever and bottom plate eye is drilled with perpendicular to face；The snubber, auxiliary snubber, reliever and periphery hole are each
Vertically setting in a row, the bottom plate eye is set in a row along the base of top bar.
3. the bilateral V-cut sinking and blasting method of Super-large-section tunnel according to claim 2, it is characterized in that：Set
Firing order is：It is snubber first；Then it is followed successively by auxiliary snubber and reliever；It is afterwards again bottom plate eye, and without both sides
Bottom plate eye at abutment wall position；It is finally periphery hole, and the eye of the bottom plate comprising two side wall positions.
4. the bilateral V-cut sinking and blasting method of Super-large-section tunnel according to claim 3, it is characterized in that：It is described
Delay is not less than 50ms, periphery hole and last detonation between row when snubber, auxiliary snubber, reliever, bottom plate eye respectively queue quick-fried
Delay between borehole is not less than 100ms.
5. the bilateral V-cut sinking and blasting method of Super-large-section tunnel according to claim 2, it is characterized in that：It is described
Snubber, auxiliary snubber, reliever and bottom plate eye use continuous charging structure, and detonator uses millisecond extension detonator thunder
Pipe is reversely ignited in borehole bottom.
6. the bilateral V-cut sinking and blasting method of Super-large-section tunnel according to claim 2, it is characterized in that：It is described
Periphery hole is cut into 4-5cm each trifle vertically using axial decoupling charge structure, powder stick, and adjacent trifle is with 40-50cm
Interval be put into periphery hole, explosive is detonated using primacord in periphery hole, in each periphery hole primacord outside aperture with
Main biography primacord is connected in " T " and carries out propagation of explosion, and detonating capsule is arranged on main biography primacord.
7. the bilateral V-cut sinking and blasting method of Super-large-section tunnel according to claim 1, it is characterized in that：For
The division of step is to determine up/down steps interface (15) on Super-large-section tunnel to be excavated first, utilizes up/down steps point
Interface (15) marks off top bar excavation area (11) and excavation area of getting out of a predicament or an embarrassing situation (12), with this determination top bar outline excavation (21) and
Get out of a predicament or an embarrassing situation outline excavation (22).
8. the bilateral V-cut sinking and blasting method of Super-large-section tunnel according to claim 7, it is characterized in that：For
The top bar outline excavation (21) carries out photoface exploision, quick-fried using horizontal shallow hole kerve for the excavation area of getting out of a predicament or an embarrassing situation (12)
It is broken, carry out photoface exploision for the outline excavation of getting out of a predicament or an embarrassing situation (22).
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| CN108894726A (en) * | 2018-07-23 | 2018-11-27 | 中铁十九局集团第六工程有限公司 | Three arm rock drilling jumbo full section of tunnel drilling operation methods |
| CN109341451A (en) * | 2018-11-09 | 2019-02-15 | 中铁二十二局集团轨道工程有限公司 | A kind of damped blasting of tunnels structure and construction |
| CN109839043A (en) * | 2019-03-15 | 2019-06-04 | 广西大学 | A kind of presplit blasting shock-dampening method |
| CN110608642A (en) * | 2019-09-20 | 2019-12-24 | 中铁二局第二工程有限公司 | Upper step bottom plate minimally invasive blasting structure and minimally invasive blasting excavation method for maintaining stability of tunnel steps |
| CN110617747A (en) * | 2019-09-20 | 2019-12-27 | 中铁二局第二工程有限公司 | Lower-step minimally invasive blasting method |
| CN113959283A (en) * | 2021-08-02 | 2022-01-21 | 贵州华昱乾城科技服务有限公司 | Blasting construction method for large-section tunnel |
| CN114719698A (en) * | 2022-05-13 | 2022-07-08 | 中铁四局集团有限公司 | Ultra-long lower step blasting construction method based on blasting refinement analysis |
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| 郭立君: "中硬岩隧道钻爆法快速施工方法探讨", 《岩土工程界》 * |
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| CN109341451A (en) * | 2018-11-09 | 2019-02-15 | 中铁二十二局集团轨道工程有限公司 | A kind of damped blasting of tunnels structure and construction |
| CN109839043A (en) * | 2019-03-15 | 2019-06-04 | 广西大学 | A kind of presplit blasting shock-dampening method |
| CN110608642A (en) * | 2019-09-20 | 2019-12-24 | 中铁二局第二工程有限公司 | Upper step bottom plate minimally invasive blasting structure and minimally invasive blasting excavation method for maintaining stability of tunnel steps |
| CN110617747A (en) * | 2019-09-20 | 2019-12-27 | 中铁二局第二工程有限公司 | Lower-step minimally invasive blasting method |
| CN110617747B (en) * | 2019-09-20 | 2022-04-15 | 中铁二局第二工程有限公司 | Lower-step minimally invasive blasting method |
| CN110608642B (en) * | 2019-09-20 | 2022-04-19 | 中铁二局第二工程有限公司 | Minimally invasive blasting excavation method for maintaining stability of tunnel step |
| CN113959283A (en) * | 2021-08-02 | 2022-01-21 | 贵州华昱乾城科技服务有限公司 | Blasting construction method for large-section tunnel |
| CN114719698A (en) * | 2022-05-13 | 2022-07-08 | 中铁四局集团有限公司 | Ultra-long lower step blasting construction method based on blasting refinement analysis |
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Effective date of registration: 20180525 Address after: 230023 No. 96 Wangjiang East Road, Anhui, Hefei Applicant after: China Tiesiju Civil Engineering Group Co., Ltd. Applicant after: Southwest Jiaotong University Address before: 230023 No. 96 Wangjiang East Road, Anhui, Hefei Applicant before: China Tiesiju Civil Engineering Group Co., Ltd. |