INTERPRETATION OF TUNNEL HAZARD WARNING LEVELS BASED ON INTACT ROCK COMPRESSIVE STRENGTH DATA TO DETERMINE THE STRESS EXPERIENCED BY THE SURROUNDING ROCK
Based on the HWL presentation, several tunnel failured occurred when the measured strain did not match the HWL graph. This may be due to a lack of comprehensive expansion of the database used to interpret each level line on the HWL. This study analyzes stress levels in rocks by plotting data from...
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| Main Author: | |
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/78252 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Based on the HWL presentation, several tunnel failured occurred when the
measured strain did not match the HWL graph. This may be due to a lack of
comprehensive expansion of the database used to interpret each level line on the
HWL. This study analyzes stress levels in rocks by plotting data from 1162
laboratory-scale compressive strength tests (UCS) on the Sakurai graph, and then
interpreting Hazard Warning Levels (HWL) based on these results. This research
aims to provide insight into the rock types found in Indonesia. The stress-strain
parameters are adjusted through trial and error to fit the graph, and the resulting
HWL interpretation is validated using a 2D numerical simulation of a basic tunnel.
If the validation results do not match, modifications will be made to the Sakurai
Hazard Warning Levels graph. After analyzing the 3 levels on the Hazard Warning
Levels graph, interpret the 3 levels of stress experienced by the intact rock on the
stress-strain curve, and at each level shows the percentage of Ci where level III =
80% UCS; level II = 40% UCS; level I = 20% UCS. The stress-strain curve
obtained from the uniaxial compressive strength test shows a 90% accuracy level
in predicting tunnel stability. |
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