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The Study of Detonation Performance of Detonation Cord under Condition of Decouple Charge

Author: HuHaiYan
Tutor: ShiXiuZhi
School: Central South University
Course: Underground space resources in science and engineering
Keywords: Detonating cord Detonation Technology Coupling coefficient of the air is not Air shock wave LS-DYNA3D Blasting experiments
Type: Master's thesis
Year: 2011
Downloads: 49
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Detonating cord initiation technique widely used in engineering blasting , not coupled to the charge condition of detonating cord , detonating performance has an important impact . Variety of coupling the charge under the conditions of detonating cord detonation performance analysis, four from detonation theory analysis and numerical simulation , blasting experiments and engineering practice applications to carry out specific research . Mutual authentication and perfect through four parts , get decouple the physical substance of the charge conditions detonating cord initiation derived attenuation formula fitting the gun hole air shock wave peak overpressure and its duration of action , and the fitting formula combination of blasting experimental results summarized factors affecting the detonating cord detonation technology . The main content of this paper and the research are as follows . ( 1) According to the detonation physics , the detonating cord hole detonate the physical model . The model assumes that the detonating cord close to the inner wall of the blast holes and artillery holes only detonating cord and air two substances , the the blasthole wall is complete and rigidity . The shock wave theory , speculated hole detonating cord explosion of the air shock wave propagation . Explosion similar rate and dimensionless analysis theory , empirical formula derived air shock wave peak overpressure and its duration of action . ( 2) using ANSYS/LS-DYNA3D numerical simulation of detonating cord detonation technology , air shock wave propagation of the gun hole fitting regression derived parameters in the empirical formula of overpressure . (3) coupling conditions for testing the air does not affect the ability of initiation of detonating cord , blasting experiments . The experiments show that in the air gap of about 25mm, coupling coefficient of about 2.0 under conditions success of detonating cord detonates the emulsion explosives . Fitting formula blasting experimental results , to found The small fitting formula calculated on blasting experimental values ??affecting that emulsion explosives drug volume air shock wave propagation in the tube . (4) blast in a variety of media dissemination of materials , theoretical analysis and numerical simulation results show that the nature of the dielectric materials significantly affect the propagation of shock waves .

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