06
Nov

PROTECTION OF SLOPE SURFACE WITH GEOFOAM VERSUS COMPACTED-FILL

Written by Gouw Tjie Liong, Ir., M.Eng, ChFC, PhD. Posted in GTL Paper, Publication

By: Anthony Gunawan PhD & Dr. GOUW Tjie-Liong

ABSTRACT: Slope failures are very common in hilly areas with high precipitation, Indonesia is one of the countries which experiences frequent slope failures. According to Indonesian National Board for Disaster Management, more than 600 slope failures occurred in 2018, resulting in more than 100 deaths. Slope protection is an important aspect of geotechnical engineering in Indonesia. One common method for slope protection is construction of retaining structures such as gabion. In most cases gabion with rock-fill is an effective solution in mitigating slope failures. However, in some cases, the extra load from the rock-fill aggravate the stability of slope instead. One particular example is taken from a case study in Puncak. A 28 m high slope, with a villa beside the peak of the slope, had experienced multiple slope failures ever since the construction of villa 30 years ago. Currently, the slope has a gradient (horizontal versus vertical) of 0.35:1 for the bottom 5 meters; 0.7:1 for the next 8 m; 1.3:1 for the following 10 m; and near vertical for the last 5 m. A retaining system using gabion and rock-fill behind the gabion was modelled with GEO5 and PLAXIS. PLAXIS analysis show that failure will occur in the midst of construction. Alternative fill using a light-fill material, geofoam, was then carried out and the construction can be carried out successfully. The retaining structure also acts as an erosion control and reduces water infiltration from rainfall. 

Download Full Paper: http://indogeotek.com/wp-content/uploads/2019/11/AG-GTL-190927s-GeoFoamProtectedSlope-Slope2019-Bali.pdf

Gouw Tjie Liong, Ir., M.Eng, ChFC, PhD

Dr. Gouw is a certified Professional Geotechnical Engineer. He has been working in the field of Geotechnical Engineering since 1984. His expertise covering geotechnical investigation, soil instrumentation, deep foundation and excavation for high rise buildings, pile load testing (Static and PDA), pile integrity testing (PIT), sonic logging test, vibration monitoring, slope stability, ground anchors, pumping test, dewatering, micropiles, tunnelling and ground improvement works, e.g. dynamic compaction, vertical drain, vibro-compaction, geosynthetic and grouting. The jobs cover more than 180 projects in Indonesia, Singapore and Srilanka. He has a great passion in the teaching and disseminating of geotechnical engineering knowledge. He serves as lecturer since late 1984. Currently, he serves as Associate Professor at Podomoro University, Jakarta for undergraduate study, and for post graduate students at Universitas Katolik Parahyangan, Bandung, Indonesia. He also conduct regular geotechnical training for engineers. He also chaired the Indonesian Chapter of International Geosynthetics Society since 2006. He has published 80 papers and 22 technical notes.

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