Abstract
In this study, the safe charge per delay (kg) of explosives and Peak Particle Velocity (PPV, mm/s) are recorded for 140 blast events at various distances which relates to the dam and hydropower projects of Karoun III, Masjed – Soleiman, and Siah – Bisheh in Iran. Parameters of Scaled Distance (SD) are estimated carefully. For the prediction of PPV, empirical equations are used. The correlation coefficients resulting from these predictors in diverse sites, are different because of varying conditions in the geomechanical and blasting parameters at each site. Therefore, considering several initial blasts and analysing their results, a suitable relationship has been selected for each case study.
Highlights
The drilling and blasting process is one of the most important and most common methods used for the excavation of underground spaces, such as tunnels, caverns, powerhouses, etc
One of the quantitative methods for estimating vibration is the evaluation of peak particle velocity (PPV) which is induced by blasting in the surrounding rocks and is a measure that defines and is used for ground vibrations
The relationship between PPV and Scaled Distance (SD) used by the empirical equation of the United States Bureau of Mine (Duvall & Fogelson, 1962) is shown in Figure 2 for all three case studies; this relationship proposed by Ambraseys – Hendron and Langefors – Kihlstrom is demonstrated in Figure 3 and 4
Summary
The drilling and blasting process is one of the most important and most common methods used for the excavation of underground spaces, such as tunnels, caverns, powerhouses, etc. One of the quantitative methods for estimating vibration is the evaluation of PPV (mm/s) which is induced by blasting in the surrounding rocks and is a measure that defines and is used for ground vibrations. For this purpose, many theoretical and empirical formulations have been proposed (Duvall and Fogelson, 1962; Attewell, 1964 & 2013; Ambraseys, 1968; Nicholls et al, 1971; Indian Standard Institute, 1973; Langefors and Kihlström, 1978; Ghosh and Daemen, 1983; Roy, 1993; Adhikari et al, 1994; Kumar et al, 2014a & 2014b; Kumar et al, 2016; Jayasinghe et al, 2019). An effort has been made to estimate PPV with an empirical model in three different dam and hydropower projects
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