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Frequency spectrum overlaying based step blasting millisecond delay suppression and vibration reduction method

A step blasting and spectrum technology, applied in blasting, measuring devices, instruments, etc., can solve problems such as vibration disasters and improper selection of delay time, and achieve the effects of convenient operation, high degree of visualization, and reliable theoretical basis.

Active Publication Date: 2019-11-22
GUIZHOU UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a millisecond delay suppression and vibration reduction method for step blasting based on frequency spectrum superposition to solve the problem of frequent vibration disasters caused by improper selection of delay time in the millisecond delay blasting operation proposed in the background technology

Method used

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  • Frequency spectrum overlaying based step blasting millisecond delay suppression and vibration reduction method
  • Frequency spectrum overlaying based step blasting millisecond delay suppression and vibration reduction method
  • Frequency spectrum overlaying based step blasting millisecond delay suppression and vibration reduction method

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Embodiment 1

[0029] The blasting site leveling project in a certain city uses JL series digital electronic detonators and their detonation system for millisecond delay blasting construction. The blasting area is mainly composed of Maokou Formation limestone, with a Platts coefficient of 8-10. Sex is basically the same. On a relatively regular step at the earthwork leveling site, 4 rows of blastholes were drilled, with 12 holes in each row, a total of 48 holes. According to the on-site construction situation, the height of the steps is determined to be 9m, the blastholes are drilled vertically, the depth is 10m, the hole spacing is 3.5m, and the row spacing is 3m. The site plans to divide the 48 blastholes into 8 groups with 6 holes as a group. In order to prevent the seismic waves between adjacent groups from interfering with each other, the millisecond delay time between groups is set to 200ms.

[0030] Firstly, a single-hole blasting test is carried out. Four times of single-hole blast...

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Abstract

The invention discloses a frequency spectrum overlaying based step blasting millisecond delay suppression and vibration reduction method. The method comprises the following steps of carrying out a field single-pore blasting test to obtain corresponding blasting vibration data; importing the obtained vibration data into a Matlab, conducting Hilbert-Huang Transformation (HHT) to obtain a marginal spectrum diagram and a percentage energy distribution diagram of the vibration data and judging the blasting earthquake wave frequency range of a blasting zone during blasting operation through a single-pore blasting vibration frequency spectrum diagram; determining the reasonable detonation section number and the delay time within the obtained frequency range according to the formula derived on thebasis of the frequency spectrum overlaying principle; and carrying out a trial blasting test and adjusting related blasting parameters according to the blasting effect. Through the frequency spectrumoverlaying based step blasting millisecond delay suppression and vibration reduction method, the problem that the millisecond delay blasting delay time is difficult to select can be solved well, thedual indexes of the blasting vibration master oscillator frequency and the vibration amplitude serve as the standards for measuring the vibration reduction effect, and the one-sidedness that the blasting effect is evaluated through the single index is avoided.

Description

technical field [0001] The invention relates to the technical field of engineering blasting, in particular to a millisecond delay suppression and vibration reduction method for step blasting based on frequency spectrum superposition. Background technique [0002] With the continuous advancement of urbanization and infrastructure construction, blasting projects are getting closer and closer to existing buildings (structures) and urban residential areas. Disasters and accidents such as casualties occur frequently, making blasting vibration disasters become the main technical bottleneck restricting the application of blasting technology in geotechnical excavation engineering. [0003] With the popularization of high-precision digital electronic detonators, millisecond delay blasting technology, as a relatively efficient, environmentally friendly and safe vibration reduction technology, has been more and more widely used. The key to the millisecond delay blasting effect is the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00G01H17/00
CPCF42D1/00G01H17/00
Inventor 陶铁军万嗣鹏罗毅张西
Owner GUIZHOU UNIV
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