PENENTUAN ZONA KESTABILAN LOMBONG TANPA PENYANGGAMENGGUNAKAN METODE REGRESI LOGISTIK.
Stability of a stope is usually expressed as Factor of Safety (FoS), whereas the FoS cannot fully reflect the stability of the stope. A stope with FoS greater than one still has possibility to collapse. A different approach in determining the stability of a stope is then required. One of the appr...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/71716 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Stability of a stope is usually expressed as Factor of Safety (FoS), whereas the FoS cannot
fully reflect the stability of the stope. A stope with FoS greater than one still has possibility to
collapse. A different approach in determining the stability of a stope is then required.
One of the approaches is the determination of stability empirically. Through this approach, the
stability of a stope can be determined easily and quickly using charts. However, this approach
has not been able to give the stope probability of stability. This research therefore proposed an
alternative method for relating RMR parameters and span with the probability stability of
unsupported stope based on the results of the logistic regression.
Logistic regression performed on the 292 data of stope stability revealed an accuracy of
84.0%. It was also shown that span affect the stability of the stope more than RMR. Graphs of
stability zones of unsupported stope and stope stability isoprobability contours have also been
proposed. |
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