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Drilling and blasting is still the most prolific way to extract minerals and associated waste from the earth, more so in case of hard rocks with uniaxial compressive strength greater than 50 MPa. Considering the growing demand for these minerals reducing ground vibrations, air vibrations, fly rocks, dust and back break has become mandatory for successful operation of these quarries and mines. A study has been carried out in one of the quartzite quarries which is surrounded by a village within about 100m-300m from quarry line. The study was carried out to understand the nature and directional variation of propagation of blast-induced ground vibration with an aim to control the same by keeping it within the permissible limits of ground vibration as suggested by Directorate General of Mines Safety (DGMS) for various types of human dwellings. The behavior of blast-induced ground vibrations and its frequency response were observed based on different variables (viz. scaled distance, direction of propagation of seismic waves, and degree of development of benches). A model consisting of two components (viz. mid-field and far-field) and its superiority and applicability over a combined equation of PPV is also discussed. Further, the directional effect of blast vibrations and the influence of degree of development of benches on the ground vibration is also outlined. This paper synthesizes the results of the abovementioned investigations and reports the development of a ground vibration prediction approach for safe and productive rock excavations in quarries and mines. Keywords—attenuation, PPV (peak particle velocity), frequency, scaled distance.

Investigations on the attenuation characteristics of blast-induced ground vibrations for developing controlled blast design