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A method for rapid on-site determination of millisecond detonator delay accuracy based on blasting vibration test

A blasting vibration and rapid measurement technology, applied in blasting, offensive equipment, fuze, etc., can solve the problem of frequency localization when the signal cannot be expressed

Active Publication Date: 2016-03-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, the analysis of the blasting vibration signal is the basis for studying the control of blasting vibration. The traditional signal analysis is based on the Fourier Transform (Fourier Transform). Since the Fourier Transform uses a global transform, that is, it is either completely in the time domain, Either it is completely in the frequency domain, unable to express the time-frequency localization property of the signal, and this property is precisely the most fundamental and critical property of the non-stationary signal

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  • A method for rapid on-site determination of millisecond detonator delay accuracy based on blasting vibration test
  • A method for rapid on-site determination of millisecond detonator delay accuracy based on blasting vibration test
  • A method for rapid on-site determination of millisecond detonator delay accuracy based on blasting vibration test

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Experimental program
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Effect test

Embodiment 1

[0050]Determine the compressional wave velocity at the test site. A blast hole is arranged in the center of the test site, and a detonator with section number MS1 is filled in the hole, and three blasting vibration monitors A, B, and C are arranged at different distances from the blast hole to receive the stress wave from the explosion and monitor The angle between the instruments is 120°. Detonate the detonator, measure the time t when the stress wave arrives at the monitoring equipment and the distance S between the detonator and the monitor. Since the delay time of the detonator in the MS1 section is 0 ms, the propagation speed of the explosion stress wave in the rock can be obtained by using formula (2) .

[0051] In a wide, smooth and complete rock mass without cracks, two rows of blastholes are arranged with a row spacing of 5m. During the test, 5 blastholes are used in each row; the holes are vertically drilled with a diameter of 70mm and a depth of 1m. The distance i...

Embodiment 2

[0062] Determine the compressional wave velocity at the test site. A blast hole is arranged in the center of the test site, and a detonator with section number MS1 is filled in the hole, and three blasting vibration monitors A, B, and C are arranged at different distances from the blast hole to receive the stress wave from the explosion and monitor The angle between the instruments is 120°. Detonate the detonator, measure the time t when the stress wave arrives at the monitoring equipment and the distance S between the detonator and the monitor. Since the delay time of the detonator in the MS1 section is 0 ms, the propagation speed of the explosion stress wave in the rock can be obtained by using formula (2) .

[0063] In a wide flat and complete rock mass without cracks, a ring of blastholes is arranged, and 9 blastholes are used in the initial test; vertical drilling, the hole diameter is 70mm, the hole depth is 1m, and the included angle between the blastholes is 22.5°. ...

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Abstract

The invention discloses a method for onsite and rapid measurement of the delay accuracy of a millisecond detonator based on explosion vibration tests. The method comprises the following steps: (1) arranging blast holes; (2) simultaneously igniting and detonating detonators in all the blast holes with detonating cords after boring holes and loading powder; (3) receiving the explosion wave transmitted from the explosion and recording the waveform data; (4) analyzing the actually measured waveform from low frequency ranges to high frequency ranges by using the wavelet analysis method, calculating a time-energy density curve of the waveform with low frequency range, so as to obtain the accurate time at which every range of explosion vibration arrives, thereby finally obtaining the accurate delay of each detonator by subtracting the propagation time of an explosion stress wave in rock. The method has the advantage that multiple ranges of detonators are simultaneously arranged in the same explosion network; the delay time of each detonator can be measured at the same time; the method can be conveniently applied in an explosion construction field; the accuracy of the millisecond detonator can be dynamically measured in real time and the explosion network can be flexibly arranged according to different terrains of experimental fields.

Description

technical field [0001] The invention relates to a method for rapidly measuring the delay time of millisecond detonators in batches based on recording the arrival time of blasting vibrations, in particular to a method for quickly measuring the delay accuracy of millisecond detonators on the spot based on blasting vibration testing. Background technique [0002] With the further deepening of hydropower development in Southwest my country and the increasing depth of mining of mineral resources, underground engineering will be more and more used in various fields of national economic infrastructure, and most slope engineering involves the blasting of underground caverns Excavation. In recent years, with the continuous development of engineering practice, blasting technology and blasting vibration control measures have made great progress, but the complexity of rock and soil media has brought great difficulties to the research of blasting control technology. Under the environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42C21/00F42D1/00
Inventor 严鹏张晨卢文波张玉柱刘亮胡浩然陈明
Owner WUHAN UNIV