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Rock Mechanics and Rock Engineering

, Volume 51, Issue 8, pp 2415–2425 | Cite as

Experimental Study on the Seismic Efficiency of Rock Blasting and Its Influencing Factors

  • Xiang Xia
  • Chong Yu
  • Bo Liu
  • Yaqun Liu
  • Haibo Li
Original Paper
  • 273 Downloads

Abstract

The seismic efficiency of a blast is the percentage of seismic energy in the total energy delivered by the explosives. It is a key indicator of the blast effects in civil engineering and seismic exploration. A method to determine seismic efficiency has been proposed based on the assumption of spherical wave radiation in an indefinite elastic medium and has been used in a series of blast tests performed at the construction site of a nuclear power plant. Analysis of the influencing factors of seismic efficiency shows that seismic efficiency increases with an increasing explosive charge and stemming length of the blastholes, while it decreases with an increasing decoupling coefficient. Generally, seismic efficiency is markedly lower in bench blasts than in paddock blasts due to free surface effects. Under any circumstances, the seismic energy only accounts for a few percent of the explosive energy. A comparison with theoretical solutions proves that the errors in the present method are low and acceptable in engineering. Therefore, some practical measures have been proposed to improve or lower the seismic efficiency according to the specific requirements of the blast operations.

Keywords

Seismic efficiency Seismic energy Explosive energy Blast Rock 

List of symbols

DP

Detonation pressure

PPV

Peak particle velocity

VoD

Velocity of detonation

γ

Pressure decay parameter

ϕ

Position angle of the monitoring point

Φ

Energy flux

ηs

Seismic efficiency

ρ

Rock density

τp

Dimensionless P-wave travel time difference of the monitoring point

τs

Dimensionless S-wave travel time difference of the monitoring point

a

Borehole radius

2L

Charge length

Lh

Depth of the blasthole

r

Radial distance of the monitoring point to charge center

re

Radius of the explosive charge

Ee

Explosive energy

Es

Total seismic energy

Esl

Seismic energy component relating to longitudinal waves

Est

Seismic energy component relating to transverse waves

cL

Longitudinal wave speed

cT

Transverse wave speed

R

Radius of the spherical control surface

S

Area of an enclosed control surface

\( \vec{t} \)

Stress tensor

\( \vec{v} \)

Particle velocity vector

Notes

Acknowledgements

The research work has been partially funded by the National Nature Science Foundation of China (NSFC, Authorizing No. 41572307, 51779248 and 51439008). We would like to thank our colleagues for their measurement work in the field. All the support and assistance are gratefully acknowledged.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhanChina

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