eismic Impact of Massive Blasts on the Bridge and East-Slope of the Route-7: Case Study of Zhur

Year 2016, Volume: 11 Issue: 1, 77 - 86, 30.03.2016

İmer Brahimaj Frashër Brahimaj

Abstract

With
reference to the discontent expressed by the ministry of infrastructure
regarding the use of limestone at the exploitation quarry of company
“Vellezerit e Bashkuar” located in Zhur Municipality of Prizren. The said
complaints refer to the large seismic shakings and impact on the stability of
the bridge and the eastern slope of the motorway. Therefore, we have decided to
sustain seismic vibration measurements at the mentioned place. The parameters
of the mining field have been included in the paperwork, along with the filling
and sketches of the connection for the drilled holes. Based on the seismic
measurements during the major blast, the parameters of seismic vibrations were
obtained and resulted that the complaints are unfounded because the
registration of seismic vibrations were maximum of 0.4 mm/s to 2.0 mm/s, whilst
the allowed domain of frequency content is in the range of 6 to 10 Hz. The
limit for the constructions of bridges is 5.0 mm/s, and for the slope degrees
20 mm/s. In order to achieve these reasonable results, the system with fuse was
implemented for initiation of the blast field, and with this initial system we
have slowed the sequences in between and slowed the drilling in the
collocation. Therefore, the amount of the explosive material that detonates at
the same time was significantly reduced.

Keywords

Detonation, Initiation, Vibration, Seismic, Nonel, Motorway

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