n Journal of Emerging Trends in Engineering and Applied Sciences - Determination of seismic blast vibrations and damage to structures in the Niger Delta region of Nigeria using peak particle velocity

Volume 5, Issue 3
  • ISSN : 2141-7016
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This work measured the peak particle velocity of the ground vibrations induced by the detonation of seismic explosives to estimate the magnitude of possible impacts on buildings. The findings are aimed at serving as reference for future seismic exploration design where explosives will be use. The seismograph recording instrument was deployed and 44 shots of 2kg, 3kg, 4kg, and 5kg charges sizes were taken and monitored at distances that ranged from 50m to 300m. This will help in resolving the many controversies about claims of property damage by communities against seismic companies in the Niger Delta area. Longitudinal, transverse and vertical components of the peak particle velocity and their frequencies were monitored and recorded. The scaled distance and the resultants of the peak particle velocity were calculated and also recorded. The vertical peak particle velocities were plotted against the longitudinal peak particle velocities to predict the likelihood of the blast impacts on the neighbouring buildings. It was discovered that no major damage would be impacted on the buildings within 50m to 300m from an explosive blast of 2kg to 5kg. Peak particle velocities for the different charge sizes were also plotted against the scaled distance to determine the geologic and soil site constants k and α. The average values obtained for the constants were 13.29 and 0.58 respectively. The United States Bureau of Mines (USBM) and Office for Surface Mines (OSM) standards were employed as guide for data analysis and interpretation. The peak particle velocities were much lower than the USBM limits. 2-3kg charge sizes detonated in the area at distances of 50m to 300m to a structure may cause no damage but a 4-5kg of explosive sizes may cause threshold damages to buildings.

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