Method for increasing blasting vibration frequency of deep-hole bench

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, reducing control difficulty, and increasing safe permissible vibration speed

CN103322872AActive Publication Date: 2013-09-25WUHAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-09-25

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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.
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Description

Technical field

[0001] The invention belongs to the field of geotechnical engineering such as water conservancy and hydropower, mining and transportation, and relates to a method for improving the vibration frequency of deep hole step blasting. Background technique

[0002] In order to improve the efficiency of drilling and blasting, large-scale rock excavation and material yard mining generally adopt deep-hole bench blasting. The blasting vibration induced by deep hole step blasting has a higher peak velocity and lower frequency than shallow hole blasting. Previous studies have shown that the frequency of blasting vibration has an important impact on rock damage and the safety of nearby buildings (structures): the lower the vibration frequency, the greater the impact of blasting vibration. Drilling and blasting of rock, the number and location of initiating points are one of the important factors that affect the frequency of blasting vibration. Traditional initiation technolog...

Examples

Embodiment Construction

[0024] The present invention improves the position and number of initiation points, divides the charge section into N initiation sections (N≥1), and sets the initiation point at the midpoint of each initiation section.

[0025] Several specific embodiments of the present invention will be further described below in conjunction with the drawings.

[0026] see figure 1 , Is a schematic diagram of the central detonation, that is, the detonation method in the case of N=1. Under the premise of ensuring the effect of blasting and fragmentation, the detonation point is set at the midpoint of the charge section.

[0027] see figure 2 , Is a schematic diagram of two-point detonation, that is, the detonation method under the condition of N=2. Under the premise of ensuring the blasting and crushing effect, the charge section is equally divided into two detonation sections, and the two detonation points are set at the midpoint of each detonation section.

[0028] see image 3 , Is a schematic dia...