15
Oct

IMPORTANCE OF ELONGATION FACTOR in Determining GEOSYNTHETICS STIFFNESS for Finite Element Calculation

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

Abstract: The application of geosynthetics for reinforced earth, also known as mechanically stabilized earth, is gaining popularity in Indonesia. At the same time, many engineers have started using geotechnical finite element software in designing the geosynthetics reinforced earth. Unfortunately, many of them still do not know the importance of elongation factor in determination of the geosynthetics stiffness to be input into the finite element calculation. Some engineers even said that elongation of the geosynthetics need not be considered in selecting the right geosynthetics material, only the breaking strength and the type of geosynthetics need to be considered. Such misconception can lead to bad performance or even failure of the geosynthetics reinforced earth. This paper elaborates the importance of the elongation factor and the correct procedure in determining the stiffness of geosynthetics materials for finite element software input.

Keywords: Elongation, stiffness, geosynthetics, finite element analysis

Download full paper: Gouw-2015-0927-ElongationFactorinGeosynthetics-Proc-SLOPE 2015

17
Jul

Kinerja Jangka Panjang Angkur Tanah dan Pengaruhnya Terhadap Stabilitas Dinding Diaphrgama – Sebuah Studi Kasus

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

Abstrak: Krisis ekonomi berkepanjangan semenjak akhir 1997 mengakibatkan banyak proyek yang terbengkalai cukup lama, diantaranya adalah galian basement yang ditinggalkan begitu saja. Makalah ini membahas salah satu proyek dengan galian basement yang sudah diselesaikan hingga kedalaman final antara 14-16.5m dari muka tanah asli. Sistem dinding penahan tanah yang digunakan adalah dinding diaphragma dengan tiga dan empat lapis angkur tanah. Saat krisis ekonomi melanda, kegiatan proyek dihentikan total, dewatering air tanah tidak lagi dilakukan, hanya pemompaan air permukaan saja yang dilakukan, itupun dengan intensitas yang sangat kurang. Galian dibiarkan terbuka selama lebih dari 6 tahun. Pertengahan Juni tahun 2003, dilakukan pengukuran-pengukuran, diantaranya: defleksi dinidng penahan tanah, gaya-gaya yang bekerja pada angkur tanah. Pengukuran ini diikuti dengan evaluasi terhadap kinerja angkur tanah dan keamanan dinding diaphragma. Diketahui bahwa angkur tanah mengalami kehilangan gaya-gaya yang cukup signifikan, yang bila dibiarkan akan dapat mempengaruhi keamanan dinding diaphragma. Disimpulkan bahwa diperlukan konstruksi berm untuk menambah kesatabilan dinding diaphragma sebagai tindakan preventif.

Download full paper: GTL-J03-2004-HATTI-Kinerja Jangka Panjang Angkur Tanah

04
Apr

Modeling of Concrete Mattress for Shore Protection by Plaxis 2D

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

Published in: International Journal of Applied Engineering Research, ISN 0973-4562-Vol. 9, No. 21 (2014) pp.9715-9728

Download Full Paper: GOUW-ModellingConcreteMattress

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