Real Time Monitoring Using Robotic Total Station on the Outlet Slope of the Cisumdawu Tunnel, West Java

Slope failure is still possible even though the slope has been designed and reinforcement has been carried out, as an example the slope of the Cisumdawu Tunnel Outlet which collapsed in October 2021. Therefore, monitoring technology is needed to anticipate slope collapse. In this study, the repaired slopes of the Cisumdawu Tunnel Outlet was monitored using a Robotic Total Station (RTS) to measure surface displacement in real time. Monitoring using RTS was carried out for approximately 40 days. The purpose of this study is to determine value and characteristic of slope displacement using an empirical approach from previous researchers. The displacement starts April 23rd at night until it reaches stability on April 24th 2022. The most significant displacement occurred in the prism target 08 which is located in the foot of slope and between the twin tunnels. It has 8 mm longitudinal displacement, the transverse displacement is 0.8 mm and the height has dropped by 13 mm. Almost the rest of the prism is in a stable state. From this study, the slope movement class is found to be regressive and categorized as velocity < 15 mm/day which is no failure expected within 48 hours. From this study, it was concluded that during the monitoring period using the RTS the outlet slope of the Cisumdawu tunnel was safe