Effect of a pre-split plane on the frequencies of blast induced ground vibrations

摘要

The effect of pre-split type artificial discontinuities on frequencies and peak particle velocities (PPV) of blast-induced ground vibrations was investigated. An artificial discontinuity (pre-split plane) was formed in between the blasting area and a recording station. The pre-split plane was generated by blasting a relatively small amount of explosives charged to holes at 1 meter intervals. Blast- induced ground vibrations were recorded in front of and behind the pre-split plane. In total, 126 ground vibrations were recorded. The experiments were carried out in Seyitomer Lignite Enterprise, Turkey. As a result of the assessment of the data, It was found that pre-split plane led to a sharp decrease in both PPV and frequency values. While the decrease in PPV has a positive influence on damage criteria, the decrease in frequency has a negative influence. This study focuses on an evaluation of frequency values which have been rather disregarded.