SELECTION OF THE OPTIMUM STAGED EXCAVATION METHOD FOR THE YOGYAKARTA-BAWEN TWIN TOLL ROAD TUNNELS
The Yogyakarta-Bawen Twin Toll Road Tunnels will be constructed in Kragan, Losari village, Magelang, Central Java with 490-510 meters in length. The twin tunnels will have large dimensions (20.18 m x 13.7 m and 490-510 meters in length) and be excavated through soft-moderate soil materials. In th...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/69407 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The Yogyakarta-Bawen Twin Toll Road Tunnels will be constructed in Kragan,
Losari village, Magelang, Central Java with 490-510 meters in length. The twin
tunnels will have large dimensions (20.18 m x 13.7 m and 490-510 meters in length)
and be excavated through soft-moderate soil materials. In this study, 3 staged
excavation methods are analyzed to obtain the optimum excavation method. The 3
excavation methods are a combination of the top heading and bench method and
the side drift method (Method 1), the three-bench seven-step excavation method
(Method 2), and the side drift method (Method 3). 2D numerical modeling was
carried out on the three methods using a cross-section at STA 20+435 which is the
location with the greatest thickness of overburden. The results show that Method 3
has the smallest vertical displacement (3 cm), compared to the others (5 cm). Each
method has a minimum plastic zone and an arch effect is formed close to the
excavation boundary. In addition, the three excavation methods have a strength
factor above 1.5, so they meet the minimum safety factor for tunnel excavation
based on KEPMEN ESDM 1827K/MEM/2018. These results show that three
excavation methods can be used to excavate Yogyakarta-Bawen Tunnel, but the
optimum method is Method 3, which is the side drift method. |
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