The Basis Research Of The Application Of Borehole Order Blasting Technology

This article, based on the summarization of the current research situation of the detonation-by-hole technique by the scholars both at home and abroad, and taking use of the demolition theory and the dissemination rule and characteristic of the vibration wave, carried out an analysis of the influencing factors of the blasting vibration, and the vibration cumulative effect. It also proposed some effective methods for the forecast and control of the demolition jarring effect in combination of demolition vibration security criteria both from domestic and abroad. Using the wavelet packet analysis theory and the Fourier transformation method, and in view of the vibration signal of the denotation-by-hole collected on scene, this article made an analysis of the energy distribution characteristics of the different frequency bands of the earthquake wave. And it proposed the three main parameters that can describe the vibration effect in the process of the detonation by hole, namely: David peak velocity, vibration frequency and duration of shock.Using the neural network theory and giving full consideration to the influencing factors of the shocking effects in the process of the detonation by hole, we have established the BP network model for the vibration parameter forecast. This model can output at the same time the three basic parameters that can reflect the shocking effect, so it is more reasonable than the empirical formula. Through the application and contrastive analysis of the BP prediction model, we also confirm that this model is closer to the spot actual result than the tradition empirical formula. In combination of the performance of the detonator with high accuracy, and high strength, we made an analysis to the design of the detonation-by-hole network and proposed several kinds of commonly-used detonation networks. Using the reliability theory, we proposed the computational method for the reliability of the non-electric detonation original part and the entire network detonation reliability.Taking using of the superiority of the SPH method in calculating the large deformation dynamics project question, and through the finite element analysis software, we carried on an numerical simulation of the entire denotation-by-hole process under four kinds of situations, namely the single-hole detonation, the double-hole detonation, four-hole detonation and the two-row porous-hole detonation. The simulation effect reappeared the entire process of the rock medium from damage to breakage, and then to be scattered and thrown. Coordinating with the changing curve of the nodal points'displacement and the distribution rule of the stress field, we made an in-depth analysis of the rock-breaking mechanism of the hole-by-hole detonation.We applied our research results in network design, vibration parameters prediction, vibration wavelet signal analysis and vibration effect control of the hole-by-hole detonation to the mine production and had a field-test-research to the hole-by-hole detonation technique. In view of the traditional elemental error initiation techniques and the hole-by-hole detonation technology, we counted all the economic indicators and compared fully the comprehensive economic cost of these two technologies. And it confirmed that if we use the hole-by-hole detonation technology, we can not only have a good control of the blasting vibration effects, but more importantly, we can bring a higher economic efficiency to the mine.