STABILITY ANALYSIS OF UNDERGROUND OPENING DUE TO BLASTING ACTIVITY OF UNDERCUT AT DEEP MILL LEVEL ZONE UNDERGROUND MINE, PT FREEPORT INDONESIA
PT. Freeport Indonesia (PTFI) is conducting mining activity of copper and gold deposit in Papua, Indonesia. One of the mining sites needs attention of the company is Deep Mill Level Zone (DMLZ) underground mine particularly blasting activity of undercut level. In blasting activity, there are part...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/54380 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | PT. Freeport Indonesia (PTFI) is conducting mining activity of copper and gold deposit in
Papua, Indonesia. One of the mining sites needs attention of the company is Deep Mill Level
Zone (DMLZ) underground mine particularly blasting activity of undercut level. In blasting
activity, there are parts of the energy passthrough the rock masses in the form of vibration. The
ground vibration could affect the stability of underground opening and may lead to collapse.
In this study, ground vibration data obtained from field measurement was calculated to obtain
the Peak Particle Velocity (PPV). The field measurement was carried out from 30 March 2019
until 07 May 2019. Data analysis was performed using regression linear scaled distance
following equation from USBM (Duvall & Fogelson, 1962) Langefors and Kihlstrom (1963),
and Ambraseys-Hendron (1968).
Evaluation the effect of blast vibration to the underground opening was performed by
numerical simulation using RS2 from Rock Science. First, the numerical results were validated
by the actual data. The results of numerical simulation with input parameter of 2% damping
ratio shown that the calculated PPV was not significantly different with the actual PPV. The
calculation results revealed that PPV of 68,15 mm/s was generated by 70,0 kg explosive charge.
This amount of charge equal to 4,67MPa blast load. The calculation results also shown that the
stability of the lower opening tunnel is in safe condition with safety factor greater than 1.00. |
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