Pengaruh Getaran Tanah Akibat Peledakaan Terhadap Kemantapan Lereng Tambang Air Laya Selatan PT Bukit Asam (Persero) Tbk

Ground Vibration Effect Due to Blasting On Slope Stability of Tambang Air Laya Selatan In PT Bukit Asam (Persero) Tbk

Abstract

Rock blasting operation generate deformation as a result of the vibration that will destruct rock
mass and cause slope failure to endager the human safety. There are so many geological structures
such as fault, joint and structures that caused the failure slope in South Air Laya Mine Site. Therefore
it is necessary to conduct a research of the influence of blast vibration on slope stability factor around
the area. Stability factor value (FK) was obtained from calculation of Geolsope 2007. Test of
Physical and mechanical parameter valueincluded value of weight content of soil / rock (w) with
kn/m3unit, cohesion (C), shear angle(), plasticity index value (IP) as well as the compressive
strenght (UCS). Vibration value was obtained from the measurement of vibration using BlasmateIII.
Vibration value used is Peak Acceleration Tranverse (the greatest point taken). Furthermore, physical
and mechanical parameters data of rock and vibration was processed by using Geoslope2007
software.Based on research conducted for 50 days by blasting as many as 15 times. Vibration value
used is 3 vibration greatest value, namely 0.102 g; 0.086 g and 0.084 g.The calculation of slope FK
value using Geoslope2007 software was obtained the comparison between slope FK before and after
blasting. Slope FK value before blasting was 3,744 to 4,058 and slope FK after blasting was 3,422 to
2,783. From the overall of slope FK value, slope in blasting area was conluded in safe category (FK >
1,25).