Study On Key Technology And Application Of Low Energy Detonating Fuses

With the development of blast engineering, man attaches more importance to low energy detonating fuses. In reverse deep rock shot holes blast engineering, using low energy detonating fuses is much better than other initiation devices. So it is widely used in blast field. In this dissertation, detonation mechanism of the fuses is studied by theoretical analyses and numerical simulations. We improved technics, and studied initiation, detonation transmission rules and application by experiments.First, the nonideal detonation theories is considered. We introduced simple detonation theories such as C-J theory, ZND model, W-K. theory and analyse detonation dia-domino offect. We introduced flow tube theory and bend detonation wave surface theory, describing dia-domino offect by theoretical analyses. We drew the conclusion that wave speed in nonideal detonation is lower than normal. Then we gave the formula calculating wave speed.Technics of low energy detonating fuses in being has much shortcomings. We found a new technics and device. Using this device, we overcomed the disadvantages of normal technics. In this way, we can get much sorts of low energy detonating fuses. The diameter and linear density of these fuses can be adjusted by people.To initiation devices, initiation performance is an important target. in this dissertation, we tested initiation performance of metal and plastic sheath low energy detonating fuses(density 2.8 g/m RDX). Then we tested heat sensitivity, impact sensitivity and sympathetic detonation. Effect of confinements on detonation wave was studied by theoretical analyses.Then we tested detonating reliability of low energy fuses in complex environment. In these experiments we found detonating reliability rules. Using these rules, we can guide blast engineering. We also got detonation speed expense rules while the fuses were bent. Because numerical simulation has much advantage, for example repetitiveness, cheap, and controlling easily etc, so it is a very important method for studying detonation problem. Theoretically, numerical simulation could reproduce every details of detonation and gained the data which is not got in experiments. In the paper, numerical simulations of bending detonating are conducted by LS-DYNA. The results by the method are consistent with the test results. Then we analysed detonation mechanism by theoretical analyses. This indicate numerical simulation is an economical and effective method for detonating problem.In the end, we introduced application of the low energy detonating fuses. We invented a new detonation magnifier using low energy detonating fuses. Then we did experiments on smooth blasting and shaped charge blasting using low energy. Experiments underwater blasting, shaped charge incision and explosion logical net are also done.