ABSTRACT
The magnitude of the seismic velocities due to excavation blastings has been measured during field tests in the shafts and inclined galleries. All tests have been performed at the faces of the approximately 1.5 m high bench. For each blasting eight holes have been bored. Each hole has been filled with detonating cord Dynacord 100 (Figure 1).The specific consumption of blasting agent amounted to approximately 300 g/m3. During the blastings, the speed of vibrations was measured at the accessible top surface of the base sealing using geophones. The distance between the blastings and the geophones was approximately 12 m in average.
