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Method for measuring detonation pressure of explosive in blast hole

A measurement method and technology of detonation pressure, applied in the direction of measuring blasting force, etc., to achieve the effect of improving reliability, reliable test results, and suitable for large-dose testing

Active Publication Date: 2015-11-11
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of this invention is to provide a method for measuring the detonation pressure of explosives in actual blastholes to solve actual engineering needs

Method used

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  • Method for measuring detonation pressure of explosive in blast hole
  • Method for measuring detonation pressure of explosive in blast hole
  • Method for measuring detonation pressure of explosive in blast hole

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Embodiment 1

[0027] ①Prefabrication of the explosion pressure lumped sensor 7: take a PVC plastic pipe with a diameter of 110mm and a wall thickness of 3.0mm as the cylindrical shell container 1, in which the length of the charge section is 200mm, the length of the contrast medium section is 292mm, the contrast medium 4 is paraffin, and the continuous resistance wire probe The total length of the needle 3 is 492.5 mm, and the total resistance is 275 ohms. The calculated resistivity of the resistance wire probe per unit length is 275 Ω / 492.5 mm=0.5584 Ω / mm. First use a plastic sheet as the partition 2, fix the continuous resistance wire probe 3 on the central axis of the PVC pipe, then melt the paraffin, cast it in the 4th section of the contrast medium reserved at the 6 places at the end of the PVC pipe probe, and wait for the paraffin to solidify Remove the plastic partition 2, and measure the paraffin wax density as ρ W0 =0.88g / cm 3 , compared to its theoretical density of 0.917g / cm 3 ...

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Abstract

The invention provides a method for measuring the detonation pressure of an explosive in a blast hole. The method is characterized in that a continuous resistance wire probe is adopted as a sensing element for measuring detonation waves and shock waves; a contrast medium and a resistance wire probe are adopted to form a lumped sensor for explosive detonation testing; transmission trajectories of detonation waves of the explosive and transmission trajectories of shock waves in the contrast medium are measured; and detonation pressure of the explosive is calculated according to an impedance matching method principle. The lumped sensor can be directly arranged in a blast hole of actual engineering blasting and can simultaneously measure the detonation velocity and the detonation pressure of the explosive; since the test method only needs one test loop, the method can be conveniently used in an engineering field, is more economical and practical, and is suitable for tests under extreme conditions such as underwater blasting and large-explosive quantity explosion. With the test method adopted, the decaying process of the shock waves in the contrast medium can be observed continuously, and linear segments of the shock waves in the impedance matching method are not needed to be theoretically estimated, and therefore, test results are more reliable.

Description

technical field [0001] The invention belongs to the technical field of blasting, and relates to a method for measuring the detonation pressure of explosives, in particular to a method for directly measuring the detonation pressure of explosives in actual blastholes at the blasting site. Background technique [0002] Explosive detonation pressure abbreviation: Detonation pressure is an important parameter in explosives, explosion effect research, and blasting engineering. So far, people have developed many methods for measuring the detonation pressure of explosives, which can be roughly divided into two types: direct measurement and indirect comparative measurement. One of the typical methods of direct measurement of explosion pressure of explosives is the piezoresistive method of directly embedding pressure sensors such as manganese sheets in explosives [Xiong Changyan, Exploration of simultaneous measurement of explosion pressure by electromagnetic method and piezoresistive...

Claims

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Application Information

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IPC IPC(8): G01L5/14
Inventor 李晓杰王小红闫鸿浩王宇新孙明王亚鹏
Owner DALIAN UNIV OF TECH
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