Measurement of Vibrations Due to Blasting in Angouran Surface and Underground Mine on the Stability of Underground Spaces

    The effect of blast-induced ground vibrations on mines and on adjacent structures and facilities is an example of the adverse consequences of the mining cycle. In order to control the vibrations, and also, manage the adverse effects, the measurement and modeling of the concerned wave attenuation are necessary. Usually, by implementing several trial blasts and analyzing corresponding ground vibrations, we can determine the related attenuation model for different sites and mines. The purpose of this research is the measurement of vibration due to blasting in Angouran surface and underground mines on the stability of underground spaced. In this research, blast-induced ground vibrations obtained from the Angouran surface and underground mines are closely examined. In the first phase, the peak particle velocity (PPV) is estimated based on the maximum charge amount per delay (Q) and the distance (R). Therefore, the stability of underground mines in relation to monitoring using common blast patterns in the Angouran open-pit mine (with a diameter of 127 mm, a burden of 4.2 m, and a spacing of 5 m) has been measured using four seismographs. The results indicate that the maximum ground vibrations resulting from open-pit blasting at the underground mine exceed the permissible vibration standards. The vibration frequencies measured in this phase were estimated to be between 6 and 90 Hz. The second phase of the studies was conducted using a new blast pattern (with a diameter of 101 mm, a burden of 3 m, and a spacing of 3.5 m) using the Power Dock method. The results of the analyses showed an acceptable reduction in seismic waves (in the range of 9 to 53) and minimal impact on the underground mine. To reduce possible risks, the managers decided to continue mining operations with the Power Dock method. It was decided to install instruments in the underground mine to monitor stability.