CN117128820A - Vibration reduction blasting method for tunnel - Google Patents
Vibration reduction blasting method for tunnel Download PDFInfo
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- CN117128820A CN117128820A CN202311107862.XA CN202311107862A CN117128820A CN 117128820 A CN117128820 A CN 117128820A CN 202311107862 A CN202311107862 A CN 202311107862A CN 117128820 A CN117128820 A CN 117128820A
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- 238000005422 blasting Methods 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000002093 peripheral effect Effects 0.000 claims abstract description 31
- 238000013461 design Methods 0.000 claims abstract description 26
- 238000009412 basement excavation Methods 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 230000000977 initiatory effect Effects 0.000 claims abstract description 6
- 238000013507 mapping Methods 0.000 claims abstract description 4
- 238000007600 charging Methods 0.000 claims description 32
- 239000002360 explosive Substances 0.000 claims description 24
- 230000005641 tunneling Effects 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 11
- 238000004880 explosion Methods 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims 6
- 238000010276 construction Methods 0.000 abstract description 17
- 230000006378 damage Effects 0.000 abstract description 4
- 239000011435 rock Substances 0.000 description 10
- 238000005474 detonation Methods 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The application relates to the technical field of tunnel construction, and particularly discloses a vibration reduction blasting method for a tunnel, which comprises the following steps: step 1: determining a contour line and a central line of a tunnel excavation surface through a mapping instrument, dividing the excavation surface into an upper step, a middle step and a lower step, marking a blasthole position according to a blasthole design drawing, and forming a blasthole layout drawing on the excavation surface; step 2: drilling according to a blasthole layout, wherein the blasthole of the upper step comprises a cut hole, an auxiliary hole, a peripheral hole and a bottom plate hole which are sequentially detonated; the middle step and the lower step of the blast hole comprise auxiliary holes and peripheral holes; step 3: successively blasting an upper step, a middle step and a lower step according to the blasting design initiation sequence, wherein all peripheral holes are blasted by adopting a smooth surface; step 4: after blasting, the current blasting segment is excavated along the longitudinal extending direction of the tunnel. The aim at of this patent is solved current tunnel construction and is adopted traditional blasting mode, causes the destruction to adjacent building easily and influences, has reduced tunnel construction tunnelling efficiency's problem.
Description
Technical Field
The application relates to the technical field of tunnel construction, in particular to a vibration reduction blasting method for tunnels.
Background
With the rapid development of traffic industry in China, traffic engineering among cities is also receiving more and more attention. The tunnel is used as a node project in line engineering, the construction of the tunnel directly influences the completion time of the whole construction project, and the construction of the tunnel crossing mountain towns is faced with a plurality of technical problems and social problems compared with mountain tunnels. The existing tunnel construction mainly adopts a drilling and blasting method, namely a method for excavating rock through drilling, charging and blasting. The blasting stress wave generated when the explosive explodes in the mediums such as rock and soil can damage the surrounding structures to different degrees within a certain range. How to reduce the harm of blasting excavation to adjacent earth surface buildings and ensure the normal use of the adjacent earth surface buildings in the construction process.
If tunnels are excavated using conventional blasting, strong blasting vibrations may have a destructive effect on neighboring buildings. Currently, there are three main ways to reduce the detrimental effects of blasting: (1) reducing the vibration intensity of the blast seismic source; (2) blocking or cutting off the propagation path of the blasting vibration wave; (3) protecting the construction subject to blasting. Domestic engineering mainly reduces the detrimental effects of blasting in a first way. Although the blasting vibration can be controlled within the range required by safety regulations in a certain environment, the tunneling efficiency of the tunnel is reduced in a complex environment, and the construction cost is increased. In order to reduce vibration of existing buildings during blasting construction, a blasting method for ensuring construction quality and progress and reducing influence of construction on adjacent buildings on the basis of the existing blasting technology is required to be sought so as to ensure structural safety of the adjacent buildings.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a vibration reduction blasting method for a tunnel, which solves the problems that the prior tunnel construction adopts the traditional blasting mode, the damage to adjacent buildings is easy to influence, and the prior vibration reduction blasting mode reduces the tunneling efficiency of the tunnel construction. In order to solve the problems, the technical scheme adopted by the application is that the tunnel vibration reduction blasting method comprises the following steps:
step 1: determining a contour line and a central line of a tunnel excavation surface through a mapping instrument, dividing the excavation surface into an upper step, a middle step and a lower step, marking a blasthole position according to a blasthole design drawing, and forming a blasthole layout drawing on the excavation surface;
step 2: drilling according to a blasthole layout, wherein the blasthole of the upper step comprises a cut hole, an auxiliary hole, a peripheral hole and a bottom plate hole which are sequentially detonated; the middle step and the lower step of the blast hole comprise auxiliary holes and peripheral holes;
step 3: charging from top to bottom according to a blasthole design drawing, wherein the specific charge value of the upper step explosive is 1.0-1.3 kg/m 3 The specific consumption value of the explosive of the middle step and the lower step is 0.5-0.7 kg/m 3 Successively blasting an upper step, a middle step and a lower step according to the blasting design initiation sequence, wherein the peripheral holes of the upper step, the middle step and the lower step are subjected to smooth blasting;
step 4: after blasting, the current blasting segment is excavated along the longitudinal extension direction of the tunnel, the blasting tunneling of an upper step is advanced to a middle step, the blasting tunneling of the middle step is advanced to a lower step, the lengths of the upper step and the middle step are 10-15 m, and the blasting circulation footage is 270-300 cm.
Further, the cut hole adopts multi-stage compound wedge cut, the aperture of the cut hole is 40-45 mm, the inclination angle is 45-75 degrees, the drilling depth is 3.3-3.6 m, the hole bottom spacing is 55-65 cm, and the hole row spacing is 75-85 cm.
Further, the cut holes are symmetrically provided with 4 groups along the central line of the tunnel excavation surface, and the four groups of cut holes comprise 3 groups of blast holes which are mutually parallel along the vertical direction and 1 group of blast holes which are obliquely arranged.
Further, the hole depth of the peripheral holes is 2.9-3.1 m, the hole spacing is 65-75 mm, and the thickness of the photo-explosion layer is 45-55 cm.
Furthermore, the uncoupled charging mode is adopted for the peripheral holes, the uncoupled charging coefficient is 1.25-1.45, the spaced charging structure is adopted, the charging length of the peripheral holes is 1.5-1.7 m, the blocking length is 1.3-1.6 m, and the diameter of the explosive cartridge is 32mm.
Further, the hole depth of the auxiliary holes is 3.1-3.3 m, the hole bottom spacing of the auxiliary holes of the upper step is 85-95 cm, the hole row spacing is 75-85 cm, the hole bottom spacing of the auxiliary holes of the middle step and the lower step is 95-105 cm, and the hole row spacing is 85-95 cm.
Further, the auxiliary holes adopt a continuous charging structure, and the blocking length is not less than 0.6m.
The technical principle and beneficial effect that this scheme produced are:
1. the vibration speed of the newly-built tunnel blasting can be effectively reduced by adopting comprehensive vibration reduction technologies such as three-stage step blasting, multi-stage compound wedge-shaped slitting, photo-blasting layer control blasting and the like. Through on-site monitoring, the blasting vibration v=1.62 cm/s at 50m, and the maximum vibration speed of the building (constructed) on the ground surface of the depending engineering is controlled within 2cm/s, so that the related requirements of safety regulations are met;
2. the multistage compound wedge-shaped cutting design is adopted, compared with the straight hole cutting, the wedge-shaped cutting has fewer drilling holes than the straight hole cutting, so that the medicine loading amount per cycle is less, the size of a cutting cavity is larger, the free surface is more beneficial to expanding, the clamping force of rock around an auxiliary hole is reduced, and better blasting conditions are created for the auxiliary hole;
3. the number of half hole ratios after the blasting of the peripheral holes has a larger influence on surrounding rock, the flatness of two sides after the blasting also influences the arrangement and the drilling precision of the next drilling, and by adopting the blasting parameters designed by the application, the half hole ratios of the peripheral holes reach more than 90 percent, the wall surface is smooth and flat, and the phenomena of concave and convex are seldom generated;
4. by adopting the multi-stage compound wedge-shaped cut hole and the design of blasting parameters of peripheral holes, the flatness of the cut surface is improved, and a good drilling environment is created for the next tunneling cycle; the average single-cycle footage is 2.89m, the average blast hole utilization rate is 93.6%, the highest cyclic footage is 2.97m, the highest blast hole utilization rate is 98.7%, no residual hole exists, and the blasting tunneling efficiency is ensured.
Drawings
Fig. 1 is a design view of a blasthole according to the present application.
Fig. 2 is a delay design of an electronic detonator.
FIG. 3 is a schematic view of the blasting driving of the present application.
Fig. 4 is a schematic view of a multi-stage compound wedge slitting of the present application.
FIG. 5 is a schematic diagram of a peripheral hole charge configuration
Fig. 6 is a schematic diagram of an auxiliary hole charge configuration.
Detailed Description
The following is a further detailed description of the embodiments:
reference numerals in the drawings of the specification include: the explosive loading device comprises an upper step I, a middle step II, a lower step III, a cut hole 1, an auxiliary hole 2, a peripheral hole 3, a bottom plate hole 4, an explosive loading section 5, a filling section 6, a cartridge 7, a detonating cord 8 and an initiating explosive 9.
Example 1 this is shown in fig. 1, 2 and 3: a tunnel vibration reduction blasting method, comprising the following steps:
step 1: determining a contour line and a central line of a tunnel excavation surface through a mapping instrument, dividing the excavation surface into an upper step, a middle step and a lower step, marking a blasthole position according to a blasthole design drawing, and forming a blasthole layout drawing on the excavation surface; the number of the upper step blast holes is 86, the number of the middle step blast holes is 54, and the number of the lower step blast holes is 57;
step 2: drilling according to a blasthole layout, wherein the blasthole of the upper step comprises a cut hole 1, an auxiliary hole 2, a peripheral hole 3 and a bottom plate hole 4 which are sequentially detonated; the blast holes of the middle step II and the lower step III comprise auxiliary holes 2 and peripheral holes 3;
step 3: charging from top to bottom according to the design drawing of the blast hole, wherein the upper step I has a small free surface and a large unit consumption value, and takes 1.1kg/m 3 Because the free surfaces of the step II and the lower step III are relatively larger in the three-step method, the unit consumption value is smaller than that of the upper step, and 0.6kg/m is taken 3 Successively blasting an upper step I, a middle step II and a lower step III according to the blasting design initiation sequence, wherein the peripheral holes 3 of the upper step I, the middle step II and the lower step III all adopt lightBlasting the surface;
step 4: after blasting, the current blasting segment is excavated along the longitudinal extension direction of the tunnel, the blasting tunneling of the upper step I is advanced to the middle step II, the blasting tunneling of the middle step II is advanced to the lower step III, the step length of the upper step I and the middle step II is 10-15 m, the preferred embodiment is 10m, and the blasting circulation footage is 280cm.
Before charging, all blastholes after drilling are blasted by high-pressure air so as to ensure that broken stone particles are not generated in the blastholes and ensure blasting effect.
The blasting parameter design comprises a cut hole design, a peripheral hole design and an auxiliary hole design, wherein the cut hole 1 adopts a multi-stage compound wedge cut, the aperture is 42mm, the inclination angle is 75-45 degrees, 4 groups of cut holes 1 are symmetrically arranged along the central line of the tunnel excavation surface, the four groups of cut holes comprise 3 groups of blast holes which are mutually parallel along the vertical direction, and the inclination angle of the four groups of cut holes is 75 degrees. Design of the cut hole drilling depth L:3.5m, the hole bottom spacing is 60cm, the hole row spacing is 80cm, and the length of the filling section is 1.0m. The cut hole adopts a continuous charging structure, and the multi-stage compound cut form is shown in figure 4.
In the tunneling process, as only one free surface exists, the clamping force of surrounding rocks is large, and the blasting condition is difficult. Therefore, the selection of the slitting mode occupies a critical position, and the slitting mode directly affects the efficiency and cost of the whole tunnel driving. The multistage compound wedge-shaped slitting design is adopted, the cyclic drug loading amount is small, the slitting cavity is larger in volume, the free surface is more easily enlarged, and better blasting conditions are created for auxiliary holes.
The designed hole depth of the peripheral holes is 3.0m, the hole spacing is 70mm, and the thickness of the photo-explosion layer is 50cm; the uncoupled charging mode is adopted, the uncoupled charging coefficient is 1.31, the spaced charging structure of the bamboo chips and the detonating cord 8 for binding the small-diameter explosive cartridges 7 at intervals is adopted, the charging structure of the peripheral holes 3 is shown in fig. 5, the charging length of the charging sections 5 of the peripheral holes 3 is 1.6m, the blocking length of the blocking sections 6 is 1.4m, the diameter of the explosive cartridges 7 is 32mm, the single-hole charging amount is 1.2kg, and the linear charging density is 0.4kg/m. The peripheral holes 3 are a row of holes which are detonated last in blasting, play a vital role in forming a tunnel section, the influence of the number of half hole ratios of the peripheral holes 3 on surrounding rock is large, the arrangement and the drilling precision of the next drilling hole are also influenced by the flatness of two sides after blasting, the blasting parameters designed by the scheme are adopted, the half hole ratios of the peripheral holes reach more than 90%, the wall surface is smooth and flat, and the phenomenon of concave and convex seldom occurs.
The hole depth of the auxiliary hole design is 3.2m, the hole bottom spacing of the auxiliary hole of the upper step is 90cm, the hole row spacing is 80cm, the hole bottom spacing of the auxiliary hole of the excavation surface of the middle step and the lower step is 100cm, and the hole row spacing is 90cm. The auxiliary hole 2 adopts a continuous charging structure, the initiating explosive 9 is wrapped near the tail end of the blast hole, the charging structure of the auxiliary hole 2 is shown in figure 6, and the blocking length of the blast hole is not less than 0.6m; the auxiliary hole blocking section of the upper step of the embodiment is 1.2m, the length of the charging section is 2.0m, the auxiliary hole blocking section of the middle step is 1.4m, the length of the charging section is 1.8m, 4 groups of auxiliary holes are shared from top to bottom in the lower step, and the lengths of the blocking sections of the 4 groups of auxiliary holes from top to bottom are 1.5m, 1.4m, 1.2m and 1.2m in sequence; the length of the charging sections of the 4 groups of auxiliary holes from top to bottom is sequentially 1.6m, 1.8m, 2.0m and 2.0m.
By adopting the tunnel vibration reduction blasting method, the vibration speed of the newly built tunnel blasting can be effectively reduced by adopting comprehensive vibration reduction technologies such as three-stage step blasting, multi-stage compound wedge-shaped slitting, photo-blasting layer control blasting and the like. Through on-site monitoring, the blasting vibration v=1.62 cm/s at 50m, and the maximum vibration speed of the building (constructed) on the ground surface of the depending engineering is controlled within 2cm/s, so that the related requirements of safety regulations are met. By adopting the multi-stage compound wedge-shaped cut hole and the design of blasting parameters of peripheral holes, the flatness of the cut surface is improved, and a good drilling environment is created for the next tunneling cycle; the average single-cycle footage is 2.89m, the blast hole utilization rate is 97.1%, the highest cyclic footage is 2.97m, the blast hole utilization rate is 98.7%, no residual hole appears, and the blasting tunneling efficiency is ensured.
The common explosives used in tunnel blasting are No. two rock emulsion explosives, viscous granular ammonium nitrate explosives, rock expanded ammonium nitrate explosives and rock powdery emulsion explosives. The emulsion explosive has good water resistance and high detonation velocity, and if the condition of excessive explosive loading occurs, the multiple explosive loading can be taken out by using a tool; the other explosive is powder, has poor water resistance, low detonation velocity and convenient charging, but the multi-charging explosive is not easy to be taken out if the multi-charging condition occurs. Based on the urban tunnel construction site environment of the embodiment, adjacent buildings are arranged on the periphery, and in order to ensure the safety of the adjacent buildings, phi 32mm rock emulsion explosive No. two is adopted.
In order to reduce the explosion vibration hazard to the greatest extent, the explosion detonator in the blast hole adopts a millisecond detonating tube detonator to detonate or adopts an electronic detonator to carry out delay explosion; namely, different sections of millisecond detonating tube detonators are respectively arranged in the blast holes according to the designed detonation sequence, or different delay times are set by using the electronic detonators, so that the detonation time of each blast hole is controlled, and the embodiment adopts the electronic detonators, and the delay design of each blast hole is shown in Table 2 in detail. The embodiment designs the detonating network connection mode of the detonating tubes to be clustered, namely after filling work is completed, detonators of the detonating tubes filled in all holes are bundled one by one according to design steps to detonate the steps step by step; or electronic detonators are used for detonating step by step, and the network diagram connection and the selection section of the detonating tube are respectively designed as shown in figure 1.
The section parameters of different steps are designed as shown in table 1, and the excavation circulation blasting parameters of three steps are designed as shown in table 2.
TABLE 1 different step section parameters
Table 2 three step excavation cycle blasting parameters
The foregoing is merely exemplary embodiments of the present application, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present application, and these should also be considered as the scope of the present application, which does not affect the effect of the implementation of the present application and the utility of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (7)
1. A tunnel vibration reduction blasting method is characterized in that: the method comprises the following steps:
step 1: determining a contour line and a central line of a tunnel excavation surface through a mapping instrument, dividing the excavation surface into an upper step, a middle step and a lower step, marking a blasthole position according to a blasthole design drawing, and forming a blasthole layout drawing on the excavation surface;
step 2: drilling according to a blasthole layout, wherein the blasthole of the upper step comprises a cut hole, an auxiliary hole, a peripheral hole and a bottom plate hole which are sequentially detonated; the middle step and the lower step of the blast hole comprise auxiliary holes and peripheral holes;
step 3: charging from top to bottom according to a blasthole design drawing, wherein the specific charge value of the upper step explosive is 1.0-1.3 kg/m 3 The specific consumption value of the explosive of the middle step and the lower step is 0.5-0.7 kg/m 3 Successively blasting an upper step, a middle step and a lower step according to the blasting design initiation sequence, wherein the peripheral holes of the upper step, the middle step and the lower step are subjected to smooth blasting;
step 4: after blasting, the current blasting segment is excavated along the longitudinal extension direction of the tunnel, the blasting tunneling of an upper step is advanced to a middle step, the blasting tunneling of the middle step is advanced to a lower step, the lengths of the upper step and the middle step are 10-15 m, and the blasting circulation footage is 270-300 cm.
2. A tunnel vibration damping blasting method according to claim 1, wherein: the multi-stage compound wedge-shaped cut is adopted for the cut hole, the aperture of the cut hole is 40-45 mm, the inclination angle is 45-75 degrees, the drilling depth is 3.3-3.6 m, the hole bottom spacing is 55-65 cm, and the hole row spacing is 75-85 cm.
3. A tunnel vibration damping blasting method according to claim 2, wherein: the utility model discloses a tunnel excavation face, including the tunnel excavation face, the downthehole line symmetry that follows the tunnel excavation face is equipped with 4 groups, four groups of downthehole holes include 3 groups of big gun holes that are parallel to each other along vertical direction to and 1 group big gun hole that the slope set up.
4. A tunnel vibration damping blasting method according to claim 1, wherein: the hole depth of the peripheral holes is 2.9-3.1 m, the hole spacing is 65-75 mm, and the thickness of the photo-explosion layer is 45-55 cm.
5. The tunnel vibration-damping blasting method according to claim 4, wherein: the uncoupled charging mode is adopted for the peripheral holes, the uncoupled charging coefficient is 1.25-1.45, the spaced charging structure is adopted, the charging length of the peripheral holes is 1.5-1.7 m, the blocking length is 1.3-1.6 m, and the diameter of the explosive cartridge is 31-33 mm.
6. A tunnel vibration damping blasting method according to claim 1, wherein: the hole depth of the auxiliary holes is 3.1-3.3 m, the hole bottom spacing of the auxiliary holes of the upper step is 85-95 cm, the hole row spacing is 75-85 cm, the hole bottom spacing of the auxiliary holes of the middle step and the lower step is 95-105 cm, and the hole row spacing is 85-95 cm.
7. The tunnel vibration-damping blasting method according to claim 6, wherein: the auxiliary holes adopt a continuous charging structure, and the blocking length is not less than 0.6m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311107862.XA CN117128820A (en) | 2023-08-30 | 2023-08-30 | Vibration reduction blasting method for tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311107862.XA CN117128820A (en) | 2023-08-30 | 2023-08-30 | Vibration reduction blasting method for tunnel |
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