In 2003, during an examination of Gough’s Cave for Palaeolithic art, a figure was noted on the wall of an alcove, in an area of the cave not affected by blasting. The figure resembles a mammoth. Close inspection suggests that engraved lines may complement natural features of the rock surface suggestive of the trunk and possibly also the tusks. The geomorphic history of the cave gives a context ...

This study evaluated the effect of alumina-blasting and three commercial adhesive primers on the shear bond strength of a dual-cured resin luting agent to zirconia ceramics. Two different-sized zirconia ceramic specimens were treated with or without alumina-blasting and then treated with one of three adhesive primers. Subsequently, specimens were cemented together with Linkmax HV (GC). Half of ...

At the underground mining works performed in coal, rock and mixed coal & rocks, process applied almost exclusively is by drilling blasting. Given that mines Jiu Valley are classified as methane mines, this involves use of explosives means initiation safe from gas dust. To date, permissible powdered have been widely used. The blasting patterns were established according to physical - mechani...

This study proposes an incremental extreme extraction method based on the waveform characteristics of ground vibration signals obtained from open-pit mines to investigate distribution and deep-hole blasting. Firstly, is proposed borehole blasting in mines. The could extract screen values effectively improve utilization rate data. space vector particle introduced analyze angle change between vel...

Evaluation of blasting-induced rock damage and fragmentation is very important for safety control construction in the jointed mass. The discontinuous numerical models are commonly applied due to advantages modeling treating discontinuities. In this paper, fracturing algorithm rate dependent strength law incorporated into deformation analysis (DDA) study wave propagation phenomena dynamic proble...

The removal of rock masses or their use with surface exploitation requires that this work be done at the lowest possible cost. reduction operating costs is by analyzing each action, working method, and possibility changing them, to have an impact on reducing costs. drilling angle one most important factors during blasting. By angle, we achieve a total length, amount explosives other changes bla...

The National Institute for Occupational Safety and Health (NIOSH) investigators compared methods for collecting personal breathing zone (PBZ) air samples for particulates during abrasive blasting at a shipyard. Abrasive blasting is the cleaning or finishing of surfaces by the use of an abrasive carried in a strong current of air. The U.S. government has provided regulatory requirements and guid...