DETERMINATION OF ROCK LOAD MAGNITUDE USING PRESSURE CELLS MONITORING AND 3D NUMERICAL MODELING
In tunnel design, tunnel stability is an important aspect that must be considered, including ensuring that the surrounding rock mass can withstand the collapse load and safety factor. Monitoring is required due to theoretical limitations to consider the interaction between soil and installed support...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/82498 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | In tunnel design, tunnel stability is an important aspect that must be considered, including ensuring that the surrounding rock mass can withstand the collapse load and safety factor. Monitoring is required due to theoretical limitations to consider the interaction between soil and installed support systems and the non- ideal distribution of soil supported by the support, so support should be more effective. Therefore, researchers will conduct numerical modeling research on ground load monitoring in the Piaoli and Samarinda tunnels, which are infrastructure tunnels.
Researchers will analyze tunnel stability using field monitoring in the form of pressure cells and strain gauges which will be compared with the 3D Finite Element Method (FEM), and compared with the load theories of Terzaghi, Bierbaumer, and Protodyakonov. The results of monitoring the load of a loosened zone are related to the arching phenomenon, or the arch effect, which refers to the formation of arches surrounding the tunnel area due to stress redistribution from the surrounding rock. The arches surrounding this area are suspected to be unstable or called collapse zones. Based on data from the Piaoli Tunnel and Samarinda Tunnel case studies, the researchers obtained comparative results that are consistent with numerical simulations using RS3 software using the potential of collapse height based on the principal stress (????1) and the potential of collapse width based on the applicable stress of the tunnel wall (????????). The analysis results show that the theory of the tunnel design stress inflection point with appropriate excavation progress makes it possible to determine the ground load in dealing with the tunnel instability problem and the support load in the case of the researcher in the research conditions, namely the Piaoli Tunnel and the Samarinda Tunnel. |
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