Comparative Study on Calculation Methods of Blasting Vibration Velocity |
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Authors: | Qingguo Liang Yafang An Lei Zhao Dewu Li Liping Yan |
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Institution: | (1) School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu, People’s Republic of China;(2) Geotechnical Engineering Group, Los Angeles Department of Water and Power, City of Los Angeles, CA, USA |
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Abstract: | Due to the extreme complexities in rock blasting and difficulties in theoretical or numerical analysis, and the enormous consumption
of explosives in mining and construction operations, empirical or semi-empirical formulae for blasting vibration velocity
(BVV) were obtained from observations and measurements in field blast tests and are still widely used all over the world.
This paper investigates the fitting degree and characteristics of several calculation methods for BVV based on 34 sets of
data samples from 27 projects belonging to 4 types. The results indicate that both the cube-root scaling formula and the square-root
scaling formula have relatively good fitting degree, while the multiple regression analysis can give the best fitting outcome
if the sample space satisfies certain requirements. Whether the cube-root scaling formula or the square-root scaling formula
is chosen to analyze the relationship between BVV and scaled distance depends on the average scaled distance under cubic-root
scaling. If the average scaled distance is over 0.1, the cube-root scaling formula should be used; otherwise, the square-root
scaling formula should be used. Bigger samples integrated from data samples of different projects but in the same type were
then analyzed to get the empirical relations for different types of projects. The correlation coefficients of these relations
are quite good, thus these relations can be used for reference in other similar projects. This paper then discusses the physical
meanings of parameters in different formulae, sample selection and parameter choice for BVV. It suggests that the current
calculation methods for explosive charge, blasting-to-monitoring distance and scaled distance need to be improved. It also
concludes that the integrated BVV from velocity components in three-dimensions is more reasonable on a theoretical basis.
It can yield good results in predicting the blasting vibration, and should be used as widely as possible. |
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