PREDICTABILITY OF THE GROUND VIBRATION PARAMETERS INDUCED BY BLASTING DURING THE TUNNELING

Although many research studies were carried out in the past to eliminate environmental issues produced from blasting, unfortunately a general approach or formula has not been established yet due to the complexity of the matter. In addition to the wave and ground motion characteristics, the complexity of blasting parameters and site factors restrict the development of a general criterion. Therefore, experimental site-specific studies should still be done for predicting and controlling the blasting effects. This paper presents the results of ground vibration measurements induced by blasting, which were performed during the tunneling for Istanbul Subway. Within the scope of the study, ground vibration components were measured for all blast events using 4 different types of vibration monitors during the advancement of about 300 m length of the tunnels which required blasting over a long period, for the estimation of the peak particle velocity, and to determine the slope of the attenuation curve together with the maximum charge per delay for the test site. At the end of the statistical analysis of the data pairs, a final relation is developed between particle velocity and scaled distance.