Rock slope stability monitoring system in the Batu Mountain area, Lembang, West Bandung

Abstract

Gunung Batu is placed in Lembang, Langensari, West Bandung right of Lembang Fault line. Lembang Fault is an active fault with a slip rate between 1.95 – 3.45 mm/year and is expected to initiate an earthquake of Mw 6.5 – 7. Earthquakes in the Lembang Fault zone occurred in the 15th and 60th centuries BC, with an earthquake cycle every 170 – 670 years. From this, earthquake cycle estimates indicate that the Lembang Fault is in the final stage of the earthquake cycle. Gunung Batu is a populous area and has grown as a recreational area. Gunung Batu has a complex geological structure with potential rock slides. The observation and kinematic analysis results of the Gunung Batu area suggested that this area partly has an unstable slope and potentially has wedge and toppling failure. This condition of instability requires further monitoring to minimize damage and losses to populations around the Gunung Batu area. The development of slope stability monitoring tools has progressed significantly recently. Selecting the proper monitoring tool is the main component of data input to prevent possible hazards. The monitoring elements include rainfall, slope movement, and tilt movement. Sensor types that will be used in this monitoring system are integrated wireless monitoring systems. This system was developed to monitor the activity of the slopes of Gunung Batu, Lembang, West Bandung. The monitoring results for the last six months show the system is running well without errors.