Probability Distribution of Blasting Vibration Induced by Right Bank Dam Abutment High Rock Slope Excavation in Baihetan Hydropower Station

Determining the probability distribution of blasting vibrations induced by high rock slope excavation can provide a theoretical basis for predicting the amplitude and frequency of these vibrations with uncertainty. This study focuses on the right bank dam abutment high rock slope excavation at the Baihetan hydropower station. It investigates recorded blasting vibration data during high rock slope excavation using typical procedures and blasting schemes through probability statistics. In addition, the research explores the probability distribution and main characteristics of the recorded blasting vibration amplitude and dominant frequency. The findings indicate that the normal and Gamma distribution models are effectively employed to fit the peak particle velocity (PPV) probability distributions of presplit and production blasting during high rock slope excavation. The PPV probability distributions of the presplit and production blasting conform to either the normal or Gamma distribution. Compared to the normal distribution model, the Gamma distribution model more effectively fits the apparent dominant frequency probability distribution of presplit and production blasting vibration during high rock slope excavation. The apparent dominant frequency probability distribution of the presplit and production blasting vibration better follows the Gamma distribution. The average values of PPV and apparent dominant frequency of presplit blasting are greater than those of corresponding production blasting. The lower to upper quartile PPV ranges of the presplit and production blasting are 5.4 to 11.6 cm/s and 3.8 to 8.9 cm/s, respectively. The lower to upper quartile apparent frequency ranges of the presplit and production blasting are 36.7 to 97.6 Hz and 26.7 to 97.6 Hz, respectively. The results demonstrate that the commonly used normal distribution is not necessarily the best probability distribution for blasting vibration. The probability distribution of blasting vibration amplitude and dominant frequency in other typical high rock slope excavations needs further examination. © 2024 Sichuan University. All rights reserved.