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All Journal Jurnal Teknik Sipil JMTS: Jurnal Mitra Teknik Sipil Indonesian Geotechnical Journal
Johan, Albert
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences

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Spatial Variability of Sliding Plane on Volcanic Region. Case Study of Sta 21+200 Cisumdawu Toll Road Arsyad, Ahmad Kemal; Wijaya, Martin; Johan, Albert; Pramono Rahardjo, Paulus
Indonesian Geotechnical Journal Vol. 3 No. 2 (2024): Vol. 3, No. 2, August 2024
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v3i2.69

Abstract

Landslide can be caused either by natural phenomenon or due to human intervention. Regardless of the triggering factor, once landslide occurs, sliding plane in the form of discontinuity or sometimes referred as sliding plane is formed. Identifying the location and geometry of the sliding plane is important in determining the location of the reinforcement to rehabilitate slope failure. However, it is often difficult to locate the location and geometry of the sliding plane as the sliding direction is also difficult to ascertain. In this paper, slope failure which occurred in STA 21+200 of Cisumdawu toll road is used as case study. Variability of the sliding planes are investigated based on the location of the concrete overbreak that occurred during the bored pile construction on Tuff (volcanic soils) in Sumedang Region. Sliding planes are also estimated based on the soil investigation and pile boring records. The proposed solution is to reinforce the bored piles that did not penetrate into the hard layer with ground anchors installed at the pile cap.
ANALISIS KINERJA EXPANDED POLYSTYRENE (EPS) GEOFOAM SEBAGAI MATERIAL TIMBUNAN Andrawan; Prihatiningsih, Aniek; James. W; Johan, Albert
JMTS: Jurnal Mitra Teknik Sipil Volume 8, Nomor 2, Mei 2025
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v8i2.32614

Abstract

Expanded Polystyrene (EPS) Geofoam is a geosynthetic material that has a light weight but remains strong. This advantage makes it a popular alternative choice in many countries. This research focuses on the utilization of EPS geofoam to improve slope stability, with analysis conducted using Plaxis 2D software. The case study was taken from a slope in West Java that is prone to ground movement. The data analyzed included slope subgrade characteristics, EPS geofoam, and soil backfill as a parameter for comparison of EPS geofoam effectiveness. Slope protection was performed using a retaining wall structure, and analysis was performed on the backfill material consisting of soil and EPS geofoam. The analysis showed that EPS geofoam can improve slope stability as a result of higher factor of safety values compared to the use of soil fill. In addition, the use of EPS geofoam can also reduce the need for additional reinforcement in the retaining wall structure. These findings indicate that the use of EPS geofoam as backfill material can reduce the risk of landslides and speed up the construction time for slope protection. Abstrak Expanded Polystyrene (EPS) Geofoam adalah material geosintetik yang memiliki berat ringan namun tetap kuat. Keunggulan ini menjadikannya pilihan alternatif yang populer di berbagai negara. Penelitian ini berfokus pada pemanfaatan EPS geofoam untuk meningkatkan stabilitas lereng, dengan analisis yang dilakukan menggunakan  software Plaxis 2D. Studi kasus diambil dari lereng di Jawa Barat yang rentan terhadap pergerakan tanah. Data yang dianalisis mencakup karakteristik tanah dasar lereng, EPS geofoam, dan timbunan tanah sebagai parameter perbandingan efektivitas EPS geofoam. Proteksi lereng dilakukan dengan menggunakan struktur dinding penahan tanah, dan analisis dilakukan terhadap material penimbun yang terdiri dari tanah dan EPS geofoam. Hasil analisis menunjukkan bahwa EPS geofoam dapat meningkatkan stabilitas lereng hasil dari nilai faktor keamanan yang lebih tinggi dibandingkan dengan penggunaan timbunan tanah. Selain itu, penggunaan EPS geofoam juga dapat mengurangi kebutuhan perkuatan tambahan pada struktur dinding penahan tanah. Temuan ini mengindikasikan bahwa penggunaan EPS geofoam sebagai material timbunan dapat mengurangi risiko longsoran dan mempercepat waktu konstruksi untuk perlindungan lereng.
ANALYSIS OF LOAD TRANSFER PLATFORM THICKNESS ON LOAD TRANSFER EFFECTIVENESS AND ROAD STABILITY IN SOFT SOIL Andrawan, Andrawan; Wijaya, Hendy; Iskandar, Ali; Johan, Albert
JMTS: Jurnal Mitra Teknik Sipil Volume 8, Nomor 3, Agustus 2025
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v8i3.34188

Abstract

Reinforcement of road embankments on soft soils is a common challenge in infrastructure projects, especially in conditions of low bearing capacity and large settlement potential. One widely used solution is the pile embankment system with the addition of granular Load Transfer Platform. This study aims to numerically evaluate the effect of variations in LTP quality and thickness on system performance. Modeling was conducted using the two-dimensional finite element method, with variations in CBR values of 40% and 45%, and LTP thicknesses of 1 m, 1.5 m, and 2 m. The parameters analyzed include the amount of embankment settlement, slope safety factor, axial force on piles, and visualization of arching effect. The results showed that increasing the quality and thickness of the LTP was able to reduce embankment settlement and increase the factor of safety, especially under short-term conditions. The axial force on the piles also increased as the stiffness of the LTP increased, although at a certain thickness it was thought that there was more optimal force attenuation. These findings indicate the importance of appropriate LTP configuration in the design of soft soil reinforcement systems. Abstrak Perkuatan timbunan jalan di atas tanah lunak merupakan tantangan umum dalam proyek infrastruktur, khususnya pada kondisi daya dukung rendah dan potensi penurunan yang besar. Salah satu solusi yang banyak digunakan adalah sistem pile embankment dengan penambahan load transfer platform (LTP) berbahan granular. Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi kualitas dan ketebalan LTP terhadap kinerja sistem secara numerik. Pemodelan dilakukan menggunakan metode elemen hingga dua dimensi, dengan variasi nilai CBR sebesar 40% dan 45%, serta ketebalan LTP 1 m, 1,5 m, dan 2 m. Parameter yang dianalisis meliputi besarnya penurunan timbunan, faktor keamanan lereng, gaya aksial pada tiang pancang, serta visualisasi arching effect. Hasil penelitian menunjukkan bahwa peningkatan kualitas dan ketebalan LTP mampu menurunkan penurunan timbunan dan meningkatkan faktor keamanan, khususnya pada kondisi jangka pendek. Gaya aksial pada tiang juga meningkat seiring peningkatan kekakuan LTP, meskipun pada ketebalan tertentu diduga terjadi peredaman gaya yang lebih optimal. Temuan ini menunjukkan pentingnya konfigurasi LTP yang tepat dalam desain sistem perkuatan tanah lunak.
Evaluasi Perilaku dan Viskositas Material Pasir Kelanauan pada Kondisi Terlikuifaksi dengan Menggunakan Piezocone Johan, Albert; Rahardjo, Paulus Pramono; Widjaja, Budijanto
Jurnal Teknik Sipil Vol 31 No 3 (2024): Jurnal Teknik Sipil - Edisi Desember
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2024.31.3.7

Abstract

Abstract Liquefaction is phenomenon of the loss of shear strength of saturated sandy soil. Liquefaction has become one of the primary concerns for Indonesia and the world, especially after the occurrence of liquefaction in Palu due to Palu-Donggala earthquake. Learning from the liquefaction phenomena after the Palu-Donggala earthquake event on 28 September 2018, many researchers have conducted liquefaction and flow slide study. In order to complete the study of the liquefaction phenomenon, an experimental study using shake table, chamber, and piezocone is conducted to evaluate the behaviour and viscosity of liquefied silty sand material. Based on the observation during liquefied condition, the silty sand material will experience an increase in excess pore pressure and a decrease in tip resistance. In addition, it is also known that sleeve resistance, speed of penetration of the piezocone, and zone of influence due to piezocone penetration are the main keys in determining the viscosity of the silty sand material during liquefied condition Keywords: Liquefaction, viscosity, silty sand, piezocone
Co-Authors Andrawan Andrawan, Andrawan Aniek Prihatiningsih Arsyad, Ahmad Kemal Budijanto Widjaja Iskandar, Ali James. W Paulus Pramono Rahardjo Pramono Rahardjo, Paulus Wijaya, Hendy Wijaya, Martin