Author Archive

Gouw Tjie Liong

Mr. 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 intrumentation, 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 a senior lecturer at Bina Nusantara University, Jakarta, Indonesia. He also conduct regular geotechnical training for engineers. He also chaired the Indonesian Chapter of International Geosynthetics Society since 2006. He has published 61 papers and 22 technical notes.
13
Nov

HIGH HYBRID REINFORCED SOIL SLOPE AS RUNWAY SUPPORT – A CASE STUDY

Written by Gouw Tjie Liong. Posted in Geotechnic, Technical Paper & Presentation (Others)

Abstract: The use of hybrid Reinforced Soil Slopes combining anchored gabion units and high strength geogrids for infrastructures development is growing in Indonesia. Hybrid RSS are considered a valid and competitive alternative to other traditional earth retaining structures. Despite this growth, civil engineers and construction companies are not yet familiar with the related design and construction aspects. This paper intends to share the Author’s experience regarding the design and the construction of the first stage of a 25 m high hybrid RSS for the new touristic airport at Central Sulawesi, Indonesia. It is worth to note that the RSS was built on soft and weathered clay shales and cohesive backfilling materials were used as part of the reinforced soil mass. This paper aims to present the main technical issues related to the project, the design process, which was carried out using both FEM and Limit Equilibrium method software, and the relevant construction aspects.

Download for full paper: 161107-11-gtl-6th-arc-on-geosynthetics

 

13
Jan

Effect of Pile Cap Thickness and Magnitudes of Lateral Movement on Laterally Loaded Group Piles

Written by Gouw Tjie Liong. Posted in GTL Paper, Publication

ABSTRACT: The capacity of laterally loaded group piles are conventionally analyzed by simply reducing the lateral subgrade reaction of the soil, kh. The lateral subgrade reaction is reduced to 0.35 kh, when the piles center to center distance is at 3 pile diameter and linearly increases up to 1.0 kh when the piles center to center distance is equal or higher than 8 pile diameter. It seems there is no consideration to the thickness of the pile cap and magnitude of lateral movement of the piles on this conventional approach. By using 3D finite element geotechnical software, the effect of these two factors can now be investigated. This paper presents the study on the impact of those two factors on lateral capacity of group piles. The study reveals that when base friction of the pile cap and the passive pressure acting against the pile cap is neglected, the effects of the pile cap thickness against group lateral efficiency is marginal and can be safely neglected. The center to center pile spacing and the lateral movement of the piles do play important roles in the capacity of the laterally loaded piles. The greater the pile spacing the greater the lateral group efficiency, so does the lateral movement.

download full paper: http://www.ejge.com/2015/Ppr2015.1320ma.pdf

27
Nov

Seberapa Besar Pengaruh Efek Gangguan dan Hambatan Alir pada Prefabricated Vertikal Drain ?

Written by Gouw Tjie Liong. Posted in GTL Paper, Publication

ABSTRACT: Sejauh ini teknik perbaikan tanah yang terbanyak diaplikasikan di Indonesia adalah aplikasi vertikal drain untuk meningkatkan kuat geser undrained dan untuk mempercepat penurunan konsolidasi pada tanah lempung lunak. Terdapat banyak makalah-makalah akademis yang mengatakan bahwa efektifitas vertikal drain perlu diperhitungkan terhadap efek gangguan saat pemasangan (smear effect) dan efek hambatan alir (drain resistance). Makalah ini menganalisa dan membahas seberapa besar efek dua faktor tersebut dalam kasus nyata di dua proyek perbaikan tanah di Balikpapan dan Bontang, Kalimantan, Indonesia. Dari analisa data-data penurunan dan monitoring piezometer terlihat bahwa efek gangguan dan efek tahanan alir tersebut dapat dikatakan tidak berarti. Dengan kata lain dalam proyek dengan vertikal drain yang dipasang sedalam 12 dan 27m ini kedua efek tersebut dapat diabaikan.

Download full paper: GOUW-2015-1125-EfekGangguan-HambatanAlir-PVD

Geotechnical Course

  • Soil Mechanis
  • Soil Investigation
  • Foundation Engineering
  • PIT, PDA, Sonic Logging
  • Slope Stabilization
  • Geotechnical Instrumentation
  • Deep Excavation
  • Ground Improvement
  • Geotechnical Instrumentation
  • Earthquake
  • Liquefaction Analysis
  • Application of Geotechnical Software
  • Other Geotechnical Course

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