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Parameters’ Optimization Analysis in Underwater Blasting

Author: GuoQiang
Tutor: WangYuJie；ZhangJianHua
School: Wuhan University of Technology
Course: Mining engineering
Keywords: Underwater Drilling and Blasting Numerical Simulation LS-DYNA Explosives consumption
CLC: U443.15
Type: Master's thesis
Year: 2005
Downloads: 260
Quote: 8
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Abstract

Underwater Drilling and blasting is an important part of the engineering blasting. At present, the domestic and international land blasting theory and construction technology have more mature and perfect. Blasting compared with the land, the research and application of underwater explosions are lagging behind. This is due to rock blasting is carried out in a water environment, its blasting technology is much more complex than the same rock formation under the conditions of the land blasting. Furthermore, underwater blasting in engineering practice relatively less because of underwater explosions elements more water down into the hole process, the charge process, the water resistance of explosives, rock formations and marine meteorological conditions The objective conditions of the many factors that limit the development of the discipline of underwater rock blasting. Underwater blasting technicians usually by virtue of the previous construction experience, engineering analogy or a large number of test explosions and thus determined empirically blasting program and the parameters. This is not only a waste of explosives, delay period, the impact of the blasting effect, and it is easy to reach the expected results and even accidents due to improper hole network parameters. This topic is a sub-project of the Shanghai Donghai Bridge Pile Foundation blasting excavation. The purpose of the research is to provide excavation by blasting holes network parameters design based on the environment. Topics selected the PM445 Piers as the object of study on the basis of theoretical and practical aspects of books and papers, in reference to the large number of underwater blasting rock blasting crushing mechanism, the use of means of mechanical analysis, and combined with the LS-DYNA software simulation as an adjunct deduced underwater drilling blasting holes network parameters. LS-DYNA numerical simulation software combined with practical engineering, simulation and analysis of rock blasting process, including rock stress, effective stress, vertical direction vibration velocity parameters change over time. TNT, explosives adopted after a large number of experiments verified pluton be considered in accordance with the plastic body, and simplify the gravity of the water for the pressure loading in rock above, taking into account the symmetry of the model, simplified to a 1/4 of the true model. The numerical simulation is an adjunct, it can not correctly reflect the actual blasting process, and so come to the same the pluton conditions under rock blasting unit consumption relationship. Pluton land blasting under the same conditions and underwater blasting a number of simulation analysis model different radius of damage calculated two boundary conditions under rock unit consumption, processing of the resulting data set was blasting and underwater blasting the rock land unit consumption relationship y = 0.0004x ~ 3 0.02x ~ 2 1.56x 0.73 (3 lt; W lt; 5), three-and secondary-coefficient is small, can be simplified formula a linear relationship, that is to say, the underwater blasting and terrestrial blasting explosives consumption within a certain range of basic linear relationship y = 1.56x 0.73 (3 lt; W lt; 5).

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