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Blasting network structure used for slight dynamite

A network structure and micro-seismic technology, applied in the field of blasting, can solve the problems of environmental damage around urban subways and unsuitable blasting of urban subways.

Inactive Publication Date: 2016-08-03
中铁二十二局集团第一工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the existing blasting technology is not suitable for urban subway blasting, and it will cause too much damage to the surrounding environment of urban subways.

Method used

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  • Blasting network structure used for slight dynamite
  • Blasting network structure used for slight dynamite
  • Blasting network structure used for slight dynamite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Such as figure 1 As shown, for the full-face smooth blasting of class II-III surrounding rock:

[0050] The diameter of the blasthole is d=32-42mm, and d=42mm in this embodiment.

[0051] The minimum resistance line w=(7-20)d. According to experience, the coefficient is 14, then: w=14×42=588mm, and w=600mm.

[0052] The layout of the blasthole:

[0053] Arrange the cutting eye 1 and the peripheral eye 4 first, and finally arrange the tunneling hole 2, and the tunneling hole 2 is evenly arranged.

[0054] Peripheral eye 4 spacing (α)

[0055] α=(0.6~0.8)w=0.67×600=400mm.

[0056] The blasthole depth is based on the cyclic footage, and the blasthole utilization rate is calculated as 0.9.

[0057] Take L=L0 / 0.9, L0—circular footage 1m (in actual construction, the loop footage should be determined according to factors such as surrounding rock conditions and grid spacing). Take L=1.11m.

[0058] Single hole charge

[0059] In tunnel blasting, different parts of the blasthole play differen...

Embodiment 2

[0090] Such as figure 2 As shown, for the smooth blasting of grade III-IV surrounding rock by the bench method:

[0091] The cyclic footage of the step method is considered as 0.5m, and the calculation method is the same as that of the full section method.

[0092] Parameter table of smooth blasting for upper and lower steps

[0093]

[0094]

[0095] Through monitoring, grasp the degree of impact of blasting on the supporting structure and surface buildings that have been constructed, which can be used to modify the drilling and blasting design to control the over-excavation and under-excavation and to protect the internal and external environment of the tunnel.

[0096] This application uses the TC-4850 blasting vibrometer produced by the Chengdu Zhongke Measurement and Control Company of the Chinese Academy of Sciences to monitor the blasting vibration velocity. The measuring points are respectively set at the vault and 1m below the arch toe. When monitoring in the cave, the dist...

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Abstract

The invention discloses a blasting network structure for microseismic blasting suitable for urban subway blasting engineering, which includes blastholes distributed on the blasting network, and the blastholes include peripheral holes, cutting holes, driving holes and floor holes. Cutting holes are arranged in the center of the blasting network structure, the peripheral holes, floor holes and driving holes are distributed in the periphery of the cutting holes in sequence, the driving holes are evenly distributed, and the hole spacing of the cutting holes is 1.5 times the hole pitch of the peripheral eye. This application aims at the characteristics of the complexity of urban subway construction compared with general railway tunnel construction. The design of the blasting network structure fully meets the requirements of urban subway construction, and will not damage surrounding facilities, which is safe and reliable.

Description

Technical field [0001] The invention relates to the field of blasting, in particular to a blasting network structure for micro-seismic blasting. Background technique [0002] As we all know, the use of explosive energy to destroy the original structure of a certain object, and to achieve different engineering purposes adopted by the arrangement and initiation method of an engineering technology. This technology involves many disciplines such as mathematics, mechanics, physics, chemistry and material dynamics, and engineering geology. As an energy source for engineering blasting, explosives contain huge amounts of energy. The energy released when 1 kilogram of ordinary industrial explosive explodes is 3.52×106 joules, the temperature is as high as 3000 ℃, the power generated by the rapid chemical reaction is 4.72×108 kilowatts, and the gas pressure is several thousand to more than ten thousand megapascals. Far exceeds the strength of ordinary substances. Under the action of thi...

Claims

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Application Information

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IPC IPC(8): F42D3/04F42D1/04
CPCF42D3/04F42D1/04
Inventor 张玉奇刘继鹏汤贵海刘小东庞前凤汪宇王亚维韩爽徐小燕武晓雷罗京川李伟涛邓小龙李海亮王兴华
Owner 中铁二十二局集团第一工程有限公司
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