Bibliographic citations
Aguilar, M., Chilón, F. (2017). Estimación de presiones dinámicas inducidas por voladura para definir distancias críticas para detonadores electrónicos Daveytronic en Tajo la Quinua Yanacocha [Tesis, Universidad Privada del Norte]. https://hdl.handle.net/11537/10673
Aguilar, M., Chilón, F. Estimación de presiones dinámicas inducidas por voladura para definir distancias críticas para detonadores electrónicos Daveytronic en Tajo la Quinua Yanacocha [Tesis]. PE: Universidad Privada del Norte; 2017. https://hdl.handle.net/11537/10673
@misc{sunedu/3015568,
title = "Estimación de presiones dinámicas inducidas por voladura para definir distancias críticas para detonadores electrónicos Daveytronic en Tajo la Quinua Yanacocha",
author = "Chilón Ayay, Fernando",
publisher = "Universidad Privada del Norte",
year = "2017"
}
ABSTRACT The electronic blasting for its better precision, nowadays practically covers the whole of the Great Mining. Electronic detonators have several protections against external effects such as the dynamic pressure. Specifically the electronic detonator Daveytronic has a resin that cover the electronic module, a copper capsule and a fusehead shield allow it to be rated as the detonator with the highest dynamic pressure resistance on the market. However, whether conditions exceed established resistance values there is always a possibility of failure. The rate of dynamic pressure events, due to a not well design and / or implementation, in Latin America in the years 2014 - 2015 to date is 1.7 ppm. On August 5, 2015, a primer was found in the pit La Quinua - Tapado Oeste, level 3252, which is why Davey Bickford initiated the execution of a series of corrective and preventive measures derived from the investigation carried out by the finding of a booster not started on the material flown, which contained two detonat ors (one electronic and another non-electric) with an obvious physical damage. During the investigation of the event, the dynamic pressure was pointed as a potential cause of the event; however, the information of implementation was not eunogh to confirm or discard this hypothesis. This research aims to define critical distances among blastholes for different scenarios, based on the strength of the aluminum and copper capsules, blasthole diameter, load length and density of the explosive, to avoid the mechanical failure of Daveytronic detonators due to to dynamic pressures. To do this, two experimental tests were carried out at the pit La Quinua level 3228 on Friday, October 06, 2015. Two "L" shaped drill patterns of 7 blastholes each one were drilled, with a burden of 14 m and a spacing between blastholes of 3.5 m. The blastholes were loaded with Explosive Quantex 73 with density of 1.15 g / cc, except for two of them, in which triaxial geophones were installed to record the tests. The information obtained in the blast area was used in the equation of Holmberg & Persson (1979), for the prediction of vibration in the near blast area. The incorporation of the data recorded by the geophones and the values of PPV (Pick Particle Velocity) obtained by H & P, allowed to find a predictive model of vibrations to 90% of reliability, the resulting equation allowed to find the value of k = 1271.4, α = 0.6855 and β = 1.371 (intrinsic rock properties). The critical design distances in which the dynamic pressure effect could be obtained were obtained by contrasting the results of the simulations performed with the JKSimblast software and the maximum pressure information allowed by Daveytronic detonators of aluminum and copper. The results showed that the possibility of being in the presence of the effect of dynamic pressure and that this effect produces some type of deformation and/or failure in the capsule of the detonators, is in direct relation with the design of load and the implementation of designs. For the case of blastholes with diameter 10 5/8" (diameter used in the pit La Quinua for production), we got a minimum critical distance of 4 meters among holes for an explosive load (Quantex) of 8 meters at a density of 1.1 g/ cc. The results obtained are only representative of the bottom sector of the Tapado West pit and it is advisable to carry out a new study of vibration measurement in case of wanting to determine possible effects of dynamic pressure in some other sector of the mine.
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