Peak particle velocity

The form of the equation to determine peak particle velocity is ... 

Fig 2 Typical values of peak particle velocity as a function of scaled distance for blasting to a free face. Charge weight is per-delay-period of eight msec or more. Blasts made under tight confinement may give values five times more than typical under normal confinement (from Ref 4)... 

Blasters can use this equation to estimate the peak particle velocity of a seismic wave or they can use the graph shown in Fig 2. For example Determine the typical peak particle velocity from a normally confined blast with a maximum charge-weight-per-delay-period of 400 lbs at a distance of 1000 ft from the receiving site. The scaled distance, R/W 4 = 1000/40044 = 50 corresponds to a peak particle velocity of 0.31 ips on the graph in Fig 2... 

It should be emphasized that the expression given in the above equation relating the peak particle velocity, charge-weight-per-delay-period, and distance provides typical values only for planning blasting projects in the absence of seismic data. For further detailed information on blasting situations where the above equation is not applicable, the measurement and interpretation of seismic waves, and techniques necessary to reduce blast vibration, the reader is referred to Refs 1,3 4 Effects of Seismic Waves on Structures. 

Damage Lavals from Ground Vibration as a Function of Peak Particle Velocity of Ground Motion Naar Structures (from Ref 4)... 

Near-field peak particle velocity (V ) measurements were grouped and analysed separately for two experimental sites. Typical log-log plot of the measured V values obtained in this study... 

Critical peak particle velocity before tensile failure (mm/s) ... 

Figure 9. Peak particle velocities versus no. of dynamic loading cycles at gneiss rock mass with acute joint orientation...

Peak particle velocities versus no. of occurrences of dynamic loading at Right-side of the tunnel is shown in Figure 13. The vibration intensity recorded atthe monitoring location was ranging from 42 to 1644 mm/s. The displacements indicated by the extensometer rod of 3m depth at the Right-side wall were proportional to the V for few blast rounds at the MAT whose V were above... 

The near field blast loading due to main tunnel excavations, could generate displacements in the rock mass, only when the peak particle velocity exceeded the critical vibration levels (V ). After repeated exposures of vibrations due to blast rounds at MAT, CVT and TRT, plastic displacements observed even at lower levels of vibrations than the V. The extra damage due to repeated... 

In their review of rock fracturing with explosive energy, Saharan et al. (2006) suggest that damage to intact rock is likely to occur when the peak particle velocity exceeds 1000 mm/s. In the... 

Measured peak particle velocity prid. Predicted peak particle velocity... 

This study provides a burden based vibration prediction model to calculate the peak particle velocity with various practical burden values. 

Figure 10. Peak particle velocity plots (PPV in the X-axis direction)...

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