BACK ANALYSIS OF THE SWELLING PHENOMENA IN DIVERSION TUNNEL USING TWO-DIMENSIONAL MODEL
In the process of constructing diversion tunnel, the project team encountered a swelling phenomenon which was indicated by deformation and rock crushing. For this reason, a back analysis was carried out to determine the condition of the deformed rock mass and to analyze additional strengthening m...
Saved in:
| Main Author: | |
|---|---|
| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/76763 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | In the process of constructing diversion tunnel, the project team encountered a
swelling phenomenon which was indicated by deformation and rock crushing. For
this reason, a back analysis was carried out to determine the condition of the
deformed rock mass and to analyze additional strengthening methods to prevent the
swelling phenomenon in the tunnel. In this study, two-dimensional numerical
modeling was carried out to further determine the value of the deformation modulus
(E) and swelling pressure using iterations. The results of these iterations are used
as the actual conditions of the tunnel for analysis of additional strengthening
methods in the form of forepoling and invert beams. The numerical iteration
produced a percent strain of 11.11% and after installation of forepoling to form a
90o circular arc resulted in a percent strain of 0.37%, installation of forepoling to
the spring line resulted in a percent strain of 0.31% and the installation of forepoling
of the roof to the tunnel wall produced a percent strain of 0.26% so it was concluded
that the three support recommendation methods gave positive results for tunnel
reinforcement. |
|---|