Smooth blasting method for tunneling

A technology of smooth blasting and tunneling, which is applied in blasting, tunneling, earthwork drilling and mining, etc. It can solve the problems that the health of construction workers on site is greatly affected, the ventilation time affects the efficiency of cycle footage, and the stability of surrounding rock is unfavorable. Achieve the effects of reducing the amount of explosives and drilling time, improving the utilization rate of blastholes, and improving construction efficiency

Pending Publication Date: 2022-02-01
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] At present, most of the smooth blasting holes are blasted at the same time. Simultaneous blasting of the smooth blasting holes will cause greater damage to the reserved rock mass, which is not conducive to the formation of a more stable slope wall, and the blasting vibration is also relatively large. , which is not conducive to the stability of the surrounding rock; secondly, more d

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  • Smooth blasting method for tunneling
  • Smooth blasting method for tunneling
  • Smooth blasting method for tunneling

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1: as Figure 1~2 As shown, a smooth blasting method for tunnel excavation adopts a peripheral light blasting hole charging structure with axially uncoupled water-interval energy-concentrating blasting, including the following specific steps:

[0040] 1) Determine the main blast zone and edge blast zone on the face of tunnel excavation, and open the main blast center hole in the center of the main blast zone (see figure 1 In a), a number of large-diameter hollow holes are symmetrically opened with the main blast central hole as the center, and several layers of main blast holes are symmetrically opened outside the large-diameter hollow holes and with the main blast central hole as the center (see figure 1 b, c and d) in b, several peripheral light blasting holes are opened in the edge detonation area (see figure 1 middle e);

[0041] The hole distance of the peripheral light blast hole is

[0042]

[0043]In the formula: K-explosion stress wave coeffici...

Embodiment 2

[0060] Embodiment 2: The rock properties of this embodiment are medium-hard rocks, the rock and soil properties are stable, and the joints and fissures are not developed;

[0061] Such as Figure 1~2 As shown, a smooth blasting method for tunnel excavation adopts a peripheral light blasting hole charging structure with axially uncoupled water-interval energy-concentrating blasting, including the following specific steps:

[0062] 1) According to the construction design requirements, determine the position of the main blast area and the reserved rock mass, determine the excavation contour line according to the position of the reserved rock mass, and determine the main blast area and edge detonation area of ​​the tunnel excavation face. The center of the main blast area is provided with a main blast center hole (see figure 1 In a), a number of large-diameter hollow holes are symmetrically opened with the main blast central hole as the center, and several layers of main blast ho...

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Abstract

The invention relates to a smooth blasting method for tunneling, and belongs to the technical field of blasting engineering. According to the method, a peripheral smooth blasting hole charging structure of axial non-coupling water interval shaped charge blasting is adopted, a main blasting area and an edge blasting area of a tunneling tunnel face are determined firstly, a main blasting center hole is formed in the center of the main blasting area, and a plurality of large-diameter empty holes are symmetrically formed with the main blasting center hole as the center; a plurality of layers of main blasting holes are symmetrically formed in the outer side of the large-diameter empty hole with the main blasting center hole as the center, and a plurality of peripheral smooth blasting holes are formed in the edge blasting area; an axial non-coupling main blasting hole charging structure is arranged in a main blasting center hole and a main blasting hole of the main blasting area, and a peripheral smooth blasting hole charging structure for axial non-coupling water interval shaped charge blasting is arranged in a peripheral smooth blasting hole; and the main blasting center hole, the main blasting holes and the peripheral smooth blasting holes are sequentially detonated hole by hole. The jet flow formed by the energy gathering groove and the water bag generate a 'water wedge' effect in the blasting process to promote the initial crack growth of the rock, and water mist is formed to reduce the dust concentration in the blasting process.

Description

technical field [0001] The invention relates to a smooth blasting method for tunnel excavation, which belongs to the technical field of blasting engineering. Background technique [0002] Smooth surface blasting usually refers to controlling the scope and direction of blasting to make the rock surface smooth and flat after blasting, to prevent cracking of the rock surface, to reduce the workload of over-excavation, under-excavation and support, to increase the stability of the rock wall, and to reduce blasting. It is a technology to control the excavation profile of the rock mass. The smooth blasting technology is used as a technical means to protect the reserved rock mass. Hole 2 detonates sequentially from the middle to both sides. As a technical means to protect the reserved rock mass, smooth blasting has been widely used and developed in the construction process of tunnels, slopes, nuclear power plants, etc. [0003] At present, most of the smooth blasting holes are bl...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04E21D9/00
CPCF42D1/00F42D3/04E21D9/006
Inventor 李洪超章逸锋张智宇武旭阳方程李恒
Owner KUNMING UNIV OF SCI & TECH
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