| dc.description.abstract | Blast geometry is an important factor in blasting activities so that special studies are needed
related to the appropriate blast geometry, especially the preparation of Spillway building area
on the construction of the Bener Dam. Approach methods used to analyze slope geometry include
Anderson's theory, R. L. Ash., and ICI-Explosive. As for the analysis of slope stability,
observations were carried out using vibration meter applications and soil material data obtained
from laboratory tests. Based on calculations, changes were made in several aspects, namely,
burden 2.3 m, space 2.7 m, height level 5.4 m, sub drilling 0.6 m, powder coloumb 2.84 m,
stemming 3.16 m. The proposed geometry resulted in a powder factor of 0.29 kg/m3 with an
average fragmentation of 30.5 cm. From the results of observations in the field it is also known
that there is a change in vibrational level from IV MMI to III - I MMI with a decreased noise and
damage.Exception value that initially amounted to 0.66 m / s2 to 0.01 – 0.44 m / s2. The results
of the slope stability analysis due to vibrations from blasting stated all slopes were above the safe
number (>2.0), so all slopes were declared safe. The ruins that have occurred because there are
remnants of chunks due to uneven fragmentation from previous blasts that are large so as to cause
a slide on the slopes. | en_US |
