A Method of Raising the Vibration Frequency of Deep Hole Bench Blasting

A technology of step blasting and vibration frequency, which is applied in the field of geotechnical engineering, can solve the problems of not considering the active control of blasting vibration frequency, etc., and achieve the effect of avoiding blasting dynamic instability, increasing safe permissible vibration speed, and reducing rock mass damage

Active Publication Date: 2015-08-19
WUHAN UNIV
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Problems solved by technology

Traditional detonation technology does not consider the active control of blasting vibration frequency

Method used

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  • A Method of Raising the Vibration Frequency of Deep Hole Bench Blasting
  • A Method of Raising the Vibration Frequency of Deep Hole Bench Blasting
  • A Method of Raising the Vibration Frequency of Deep Hole Bench Blasting

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Embodiment Construction

[0023] The invention improves the position and quantity of the detonation point, divides the charging section into N detonation sections (N≥1), and sets the detonation point at the midpoint of each detonation section.

[0024] Several specific implementations of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] See figure 1 , is the schematic diagram of the initiation of the middle part, that is, the initiation method in the case of N=1. On the premise of ensuring the blasting fragmentation effect, the initiation point is set at the middle point of the charge section.

[0026] See figure 2 , is a schematic diagram of two-point initiation, that is, the initiation method in the case of N=2. On the premise of ensuring the blasting fragmentation effect, the charge section is divided into two initiation sections, and the two initiation points are respectively set at the midpoint of each initiation section.

[0027] See ...

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PUM

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Abstract

The invention discloses a method for increasing blasting vibration frequency of a deep-hole bench. The method includes steps of distributing blast holes as blasting requirements, completing a charging structure in the blast holes, dividing a charging section into N (N>1) detonating sections and setting detonating points in middles of different detonating sections, and detonating by means of detonators, wherein the length of the detonating sections is not less then twice of the damage radius. By the method, blasting vibration frequency of rocks in the range of 20-110 m around a blasting source can be increased, damage degree of the rocks is reduced, natural frequency of neighboring buildings can be avoided, and blasting power unstability due to resonance of the neighboring buildings is avoided. The method can be used for blasting excavation construction in rock engineering fields such as water conservancy and hydropower, mines and traffics.

Description

technical field [0001] The invention belongs to the fields of geotechnical engineering such as water conservancy and hydropower, mining and transportation, and relates to a method for increasing the vibration frequency of deep-hole step blasting. Background technique [0002] In order to improve drilling and blasting efficiency, large-scale rock mass excavation and stockyard mining generally adopt deep hole bench blasting. The blasting vibration induced by deep hole blasting has higher peak velocity and lower frequency than shallow hole blasting. Previous studies have shown that blasting vibration frequency has an important impact on rock mass damage and the safety of adjacent buildings (structures): the lower the vibration frequency, the greater the impact of blasting vibration. For rock drilling and blasting, the number and location of blasting points are one of the important factors affecting the blasting vibration frequency. Traditional detonation technology does not c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00
Inventor 卢文波周俊汝陈明严鹏
Owner WUHAN UNIV
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