Field experiment on the application of siphon drainage system for landslide stabilization in a volcanic hill slope in Indonesia

Penulis: Dr. Keigo Koizumi, Prof. Kazuhiro Oda, Prof. Mitsuru Komatsu
Efforts to implement a siphon drainage system require good knowledge of the performance of the drainage system to reduce groundwater levels in the landslide area. A long-term field experiment was conducted to evaluate the performance of the siphon drainage system to maintain the stability of landslide masses on a volcanic hill slope in Indonesia. Changes in groundwater levels in ten siphon wells were monitored periodically, and the water discharged from each siphon well through siphon tubing was measured in each flushing system. Results of a one-year measurement of the groundwater level indicate that the siphon drainage system was effective in decreasing the groundwater level in the landslide masses to a maximum depth of 7 m with a total drainage flow of 650-700 liters/hour. The drainage system also maintained the deep groundwater level during a rainfall period. Results of slope stability analyses under a steady-state seepage condition showed that the stability of the landslide area increased significantly. The field study suggests poor groundwater quality affects the drainage flow rate. Thus, regular maintenance of siphon tubing is necessary.

Bulletin of Engineering Geology and The Enviroment

ISSN / ISBN / IBSN : 1435-9537

No. Arsip : LIPI-20200121