14
Oct

EFFECTS OF PILE LATERAL MOVEMENT, PILE SPACING AND PILE NUMBERS ON LATERALLY LOADED GROUP PILES

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

ABSTRACT: Based on 3D finite element numerical analysis on 3×3 pile group Gouw and Hidayat (2015) suggested that that when base friction of the pile cap and the passive pressure acting against the pile cap are neglected, the effects of the pile cap thickness against group lateral efficiency is marginal and can be safely neglected. They also briefly mentioned that the center to center pile spacing and the lateral movement of the piles also affect the capacity of the laterally loaded group piles. To investigate the effect of the magnitude of pile lateral movement and pile spacing to larger pile groups, the study was continued by carrying further analysis on 5×5 and 9×9 pile groups, taking the same modelling assumption where base friction and passive resistance induced by pile cap were neglected. The study revealed that pile group lateral efficiencies were found to be larger when the center to center pile spacing were wider. It was also found the greater the number of piles in the group the lower the pile lateral efficiency. However, pile head lateral (horizontal) movement only have marginal effect on the lateral efficiency of group piles.

Full paper download: 170926s-PILE2017-GTL-Efffect of Lateral Movement

14
Oct

The Important Role of Execution and CQA/CQC Plans in Building with Geosynthetics

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

Matteo Lelli1, Gouw Tjie-Liong2, Riccardo Laneri3, Marco Cerro

Abstract: The use of geosynthetics for the construction of mechanically stabilized earth retaining structures is constantly growing in Indonesia. These structures have shown economic advantages if compared to traditional mass gravity retaining structures. However, the importance of their execution is sometimes underrated. Construction Quality Control and Quality Assurance plans are often meagre and sometimes even missing. Mechanically stabilized earth structures rely on the collaboration between the compacted soil and the geosynthetic reinforcement. If one of these two components is not properly installed or other factors such as drainage system do not comply with the project specifications, unsuitable structure deformations or even failures may occur. This paper aims to share some good construction practices in order to build reinforced earth structures using geosynthetics. Furthermore, the Authors propose some simple but effective testing procedures which can be included in CQC and CQA plans. The scope of this paper is therefore to give guidance to project Owners, Designers and Construction Companies to deliver cost effective, safe and durable geotechnical structures built with geosynthetics.

Full paper download: 171003s-GeonsintetikIndonesia2017

24
Dec

Pendidikan untuk Kemajuan Indonesia

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

Manfaatkan dan tingkatkan mutu pendidikan demi kemajuan Indoensia, sebuah wawancara Gouw dengan majalah Konstruksi tahun 1997, lengkapnya bisa dibaca dengan klik link ini: konstruksi-253-mutu-pendidikan-utk-kemajuan-indonesia-1997a

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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Motivational Course

  • Cultivating Engineering Judgment
  • The Problem of Engineer
  • How I Present Myself
  • Light Up
  • Toward Successful Engineering Career
  • Pressure lead to Success
  • The Up and Down of My Life
  • Theory of Emptiness
  • Turning Thought into Reality
  • Young Engineer