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Tunnel blasting intelligent hole distribution method

A tunnel and hole-laying technology, which is applied in blasting and other directions, can solve the problems of increasing the difficulty and cost of support construction, the mechanism of blasting action is not deep enough, and the rock cannot be broken efficiently, so as to achieve the overall blasting effect is safe and stable, easy to operate and load, The effect of reducing usage

Active Publication Date: 2020-09-22
NANJING INST OF RAILWAY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current research on the mechanism of blasting is still not deep enough, and the selection of design parameters in the blasting design cannot be given an accurate theoretical calculation method. Generally, the design parameters are based on experience or engineering analogy. When using traditional blasting methods, on the one hand It may cause the dissipation of detonation energy, which cannot efficiently and economically break rocks. On the other hand, detonation energy overflows, resulting in excessive rock fragmentation, which increases the difficulty and cost of support construction and reduces economic benefits.

Method used

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  • Tunnel blasting intelligent hole distribution method
  • Tunnel blasting intelligent hole distribution method
  • Tunnel blasting intelligent hole distribution method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a tunnel blasting intelligent hole layout method comprises the following steps:

[0034] (1) Peripheral hole 1 and positioning hole 11 are drilled, and positioning hole 11 is located at the centroid center of the excavation surface. Specifically, the cross method can be used for positioning;

[0035] (2) Next, the peripheral eye 1 and the positioning eye 11 are blasted. For the peripheral eye 1, the charge is blasted on a smooth surface, using an uncoupled charge structure; Blasting can effectively form rock cracks 5 around the positioning hole 11, which are used for the layout of the rear cutting hole 4 and auxiliary hole 3; the hole diameter of the positioning hole 11 is about 2 to 3 times that of the peripheral hole 1, and the specific needs are based on the nature of the rock mass. Make corresponding adjustments; when blasting, blast the peripheral eye 1 first, and then blast the positioning eye 11;

[0036] (3) Next, accurately locate t...

Embodiment 2

[0041] Such as Figure 4 As shown, it is basically the same as Embodiment 1, the difference is: when the tunnel width is too wide or the height is too high, when the blasting design is carried out, the tunnel plane is divided into different divisional surface blocks 12, and each divisional surface block 12 All can be regarded as a separate tunnel blasting excavation surface, the peripheral eyes are arranged according to the largest outer circle, and the positioning eyes 11 are arranged according to the particle centers of the divided surface blocks 12 . During the blasting, the blasting of the peripheral eye 1 is first carried out, and the positioning eye 11 is blasted in the order from top to bottom. For the upper positioning eye 11, the completion of the blasting of the lower positioning eye 11 is equivalent to forming the free surface. For different division surface blocks 12 The connection area of ​​the 12 can better form the extended crack 5, the layout of the cut hole 4 ...

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Abstract

The invention discloses a tunnel blasting intelligent hole distribution method which comprises the following steps: perforating periphery holes and positioning holes, blasting the periphery holes andthe positioning holes, precisely positioning and arranging cutting holes and auxiliary holes; blasting the cutting holes and the auxiliary holes; carrying out powder charge on the periphery holes according to smooth blasting; adopting a non-coupling charging structure to blast the periphery holes first; enabling the positioning holes to be at the center of the mass point of an excavation face, andadopting an energy-gathering hydraulic pressure blasthole device; and after blasting the positioning holes, according to the crack development direction, adopting a positioning device to determine the cutting hole positions, determining the auxiliary hole positions by combining with a calculation method, then, blasting the cutting holes, and finally blasting the auxiliary holes. According to thetunnel blasting intelligent hole distribution method, the blasthole positions are positioned through the crack development direction, the explosive detonation energy is utilized to the maximum, levelling of the overall outline is ensured after blasting the periphery holes, the explosive usage amount is greatly reduced, the economic cost and disturbance of blasting impact to surrounding rock mass are reduced, and the overall blasting effect is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an intelligent hole-laying method for tunnel blasting. Background technique [0002] The blasting construction for the tunnel face is mainly to blast the rock mass in the excavation part of the main body of the tunnel, and then arrange explosives on the tunnel design contour line to form a flat excavation surface. During the entire construction process of the tunnel, the quality of the blasting excavation effect will directly affect the progress of subsequent types of work, such as excessive tunnel excavation leading to support voids, under-excavation leading to insufficient lining thickness, and uneven contour lines leading to uneven initial lining surface , Excessively large crushed stones affect transportation efficiency, etc. Therefore, tunnel blasting technology has played a decisive role in tunnel construction progress, construction quality, construction safety...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04
Inventor 单鹏李润璞王霜
Owner NANJING INST OF RAILWAY TECH
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