RI7937 - Vibrations From Underground Blasting

Oct 07, 2003

James J. Snodgrass and David E. Siskind

RI7937 - Vibrations From Underground Blasting 
 
    
 I I I
 
 Bureau of Mines Report of Investigations/l974
 
 Vibrations From Underground Blasting
 
 UNITED STATES DEPARTMENT OF THE INTERIOR
 
 Copyright © 2000 International Society of Explosives Engineers
RI7937 - Vibrations From Underground Blasting 1 of 19 
  
 
   
 0 Report of Investigations 7937
Vibrations From Underground Blasting
 
 By James J. Snodgrass and David E. Siskind
Twin Cities Mining Research Center, Twin Cities, Minn.
 
 UNITED STATES DEPARTMENT OF THE INTERIOR
Rogers C. B. Morton, Secretary
 
 BUREAU OF MINES
Thomas V. Falkie,  Director
 
 Copyright © 2000 International Society of Explosives Engineers
RI7937 - Vibrations From Underground Blasting 2 of 19 
  
 
   
 CONTENTS
Page
 
 Abstract...................................................,............. 1
Introduction
Test sites ............................................................................................................................
 
 k
 
 White Pine .......................................................... 5
Shullsburg .......................................................... 7
NON ............................................................... 7
Pilot Knob .......................................................... 8
 
 Measurements and analysis ................................................ 9
Acceleration measurements ........................................... 10
 
 White Pine ..................................................... 10
Pilot Knob...........* ......................................... 13
 
 Velocity measurements ............................................... 14
Shullsburg ..................................................... 14
NO~D .......................................................... 18
 
 Conversion of acceleration to velocity .............................. 18
Numerical methods .............................................. 20
Electronic integration ......................................... 20
Simple harmonic motion..............+ .......................... 22
 
 Scaling factors ..................................................... 23
Propagation equations ............................................... 25
 
 Discussion of results..............~ ..................................... 27
Conclusions
 
 ...........................................................................References.................................................*
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 ILLUSTRATIONS
 
 Stratigraphic column and mine headings, White Pine ore body ......... 4
Thin section , parting shale of White Pine ore body .................. 7
Stratigraphic column and'test heading, Shullsburg mine .............. 8
White Pine test headings 1-2 ........................................ 9
White Pine test headings 3-4 ........................................ 12
 
 'White Pine test heading 5 ........................................... 13
White Pine full-column round ........................................ 15
White Pine parting shale round ...................................... 15
Pilot Knob test heading ............................................. 16
Typical Shullsburg production round ................................. 17
Map of Shullsburg test heading ...................................... 19
Typical NORAD blast round . ...... ............
 
 ...........................................Plan and profile views of NORAD exploratory drift
zy
 
 Comparison of regression lines representing directly recorded and
derived velocities ................................................ 24
 
 Least-squares regression lines of Pilot Knob data after (a) simple
harmonic conversion and (b) electronic integration ................ 24
 
 Least-squares regression lines of square-root-scaled velocity data . . 26
Least-squares regression lines of square-root-scaled acceleration
 
 data .............................................................. 26
Least-squares regression lines of cube-root-scaled velocity data .... 27
White Pine velocity data ............................................ 28
 
 Copyright © 2000 International Society of Explosives Engineers
RI7937 - Vibrations From Underground Blasting 3 of 19 
  
 
   
 VIBRATIONS FROM UNDERGROUND BLASTING
 
 bY
 
 James J. Snodgrass 1 and David E, Siskind 1
 
 ABSTRACT
 
 The Bureau of Mines has investigated vibration levels produced by blast-
ing at four underground sites to establish how such factors as type of explo-
sive, delay blasting, charge weight, and geology affect amplitudes of ground
motion. A summary of the work is presented and the results of further analy-
sis of the data are discussed. Square root scaling was found applicable to
two of the underground sites and could be applied with minor error to all the
sites. Comparison of empirical propagation equations in the different rock
types indicates that although the site effect is apparent, the combined data
may be used as a basis for engineering estimates of vibration amplitudes from

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