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All Journal Inersia : Jurnal Teknik Sipil dan Arsitektur MEDIA KOMUNIKASI TEKNIK SIPIL Research Report - Engineering Science Jurnal Teknik Sipil Jurnal Teknik Sipil dan Perencanaan Jurnal Teknik Sipil Teras Jurnal Journal of the Civil Engineering Forum U Karst Civil Engineering Dimension Dinamisia: Jurnal Pengabdian Kepada Masyarakat BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil SIKLUS: Jurnal Teknik Sipil Jurnal Aplikasi Teknik Sipil Jurnal Rekayasa Sipil Journal of Applied Engineering and Technological Science (JAETS) Jurnal Komposit : Jurnal Ilmu-Ilmu Teknik Sipil APPLIED RESEARCH ON CIVIL ENGINEERING AND ENVIRONMENT (ARCEE) Journal of the Civil Engineering Forum Makara Journal of Technology Indonesian Geotechnical Journal

Aswin Lim

Jurusan Teknik Sipil, Fakultas Teknik Universitas Katolik Parahyangan, Bandung

Author-ID : 307331

Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Analisis Galian Dalam dengan Metode Konstruksi Top Down Menggunakan Analisis Elemen Hingga 2-Dimensi dan 3-Dimensi Vinna Fransiska Chou; Paulus Pramono Rahardjo; Aswin Lim
Jurnal Teknik Sipil Vol 29 No 1 (2022): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2022.29.1.4

Abstrak Kasus galian dalam perlu mendapat perhatian khusus terkait defleksi dinding dan deformasi tanah yang dipicu akibat galian dalam itu sendiri. Defleksi dinding maupun deformasi tanah yang berlebihan dapat menyebabkan kerusakan pada struktur sekitarnya. Untuk memverifikasi performa maupun keamanan pekerjaan galian dalam dapat dilakukan analisis balik. Penelitian ini berfokus pada analisis balik terhadap pekerjaan galian dalam pada salah satu bangunan perkantoran tersohor di Indonesia. Galian ini menggunakan metode konstruki top-down dengan dinding diafragma berdiameter 0,8m sebagai sistem penahan. Melalui penelitian ini, diketahui bagaimana jika parameter hasil analisis balik dengan metode elemen hingga 2-Dimensi digunakan dalam analisis 3-Dimensi. Analisis menggunakan model material Hardening Soil dan analisis balik mengacu kepada hasil pengukuran inklinometer. Berdasarkan hasil analisis diperoleh bahwa analisis 3-Dimensi memberikan hasil defleksi dinding dan deformasi tanah yang underestimated dibandingkan dengan analisis 2-Dimensi. Hal ini disebabkan oleh efek 3-Dimensi yang berperan signifikan. Jika dilakukan iterasi parameter agar diperoleh hasil defleksi dinding yang sesuai antara analisis 3-Dimensi dengan hasil pengukuran lapangan, nilai modulus tanah perlu direduksi hingga 80% pada kasus ini. Artinya, nilai modulus tanah menjadi parameter yang berperan penting dalam memprediksi besarnya defleksi dinding akibat galian. Selain itu, besarnya defleksi dinding dan deformasi tanah juga dipengaruhi oleh faktor kedalaman galian. Kata-kata Kunci: Analisis balik, defleksi dinding, deformasi tanah, galian dalam, metode elemen hingga, metode konstruksi top-down Abstract Deep excavation needs special attention regarding wall deflection and soil deformation induced by the excavation work itself because excessive one can cause damage to the vicinity structure. Back analysis can be carried out to verify the performance and the safety of excavation. This research focuses on the back analysis of deep excavation in a famous office building construction in Indonesia. The excavation was executed using top-down construction method with diameter 0.8m of diaphragm wall as a retaining system. Through this research, it can be known how the parameter of back analysis using 2-Dimensional finite element method is modeled in 3-Dimensional analysis. Soils were modeled as a Hardening Soil model and back analysis was referred to inclinometer measurements. Based on the analysis results, it was found that 3-Dimensional analysis gave underestimated wall deflection compared to 2-Dimensional analysis. It is due to the 3D effect that performed significantly. If the soil parameter was iterated to obtain relevant wall deflection between 3-Dimensional analysis and field measurement, soil modulus needs to be reduced by 80% in this case. It means that soil modulus becomes an essential parameter in predicting wall deflection induced by excavation. Besides, excavation depth also affected wall deflection and soil deformation. Keywords: Back analysis, deep excavation, finite element method, soil deformation, top-down construction method, wall deflection

Influence of Pre-Stressing on Tieback Retaining Wall for Sandy Soils Excavations Anthonius Steven Sutanto; Paulus Pramono Rahardjo; Aswin Lim
Journal of the Civil Engineering Forum Vol. 7 No. 3 (September 2021)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.61564

Pre-stressed ground anchor systems or tieback systems are commonly used at wide and irregular-shaped excavations, with the advantage of lower cost and ease of construction compared to the braced excavations, but they come with the drawback on permits for excavations near buildings and tunnels. Research on tieback systems in sands was generally conducted. However, the studies on the correlation between the retaining wall deflection and pre-stress force are few. The objectives of this paper are to study the influence of pre-stress force, depth of excavation, wall embedment length, and soil shear strength that is represented by soil friction angle on the deflection and soil pressure acting on the retaining wall. The parametric study was conducted on an excavation in sand using the finite element method with the Hardening soil model. The results showed that a 50 kN/m increase in pre-stress force reduced the wall deflection on top of the wall by 0.005–0.083% of excavation depth. However, the pre-stressing influence in reducing wall deflection at excavations became less significant along with the sand density increase due to higher friction angle contribution to excavation stability. Moreover, the pre-stress force needed for stabilization of the wall with long embedment length is smaller than those on the wall with shorter embedment length, since the embedment length increase of 0.25 times of excavation depth reduces wall top deflection by 0.002–0.095% of excavation depth. Also, the increase of soil density reduces the need for wall embedment length, so at dense sand, the embedment length of 0.5 times of excavation depth is sufficient to support the excavation.

Finite Element Modelling of Prestressed Concrete Piles in Soft Soils, Case Study: Northern Jakarta, Indonesia Aswin Lim; Varian Harwin Batistuta; Yiska Vivian Chritiansen Wijaya
Journal of the Civil Engineering Forum Vol. 8 No. 1 (January 2022)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Jakarta is faced with limited land resources due to its position as the capital city of Indonesia. Therefore, numerous high-rise buildings are being constructed to solve this problem and provide accommodations for a large number of Jakarta residents. Studies have shown that prestressed concrete piles (spun piles) are commonly used as the foundations of high-rise buildings in metropolitan cities across Indonesia, especially in the Northern Jakarta Coastal area, which is predominant with deep soft soils deposit. To further assess and verify the ultimate capacity of the pile, a static loading test was conducted. However, not all results from the field test produced ideal, accurate, precise, and reliable load-settlement curve (until failure) results. Therefore, this study aims to determine the soil properties for the analysis of prestressed concrete spun piles with a diameter of 600 mm in the Northern Jakarta coastal area based on the standard penetration test values (SPT-N). It is a case study of a well-documented static pile load test using the kentledge system. Back analyses were performed by the finite element method to obtain the extrapolated load-settlement curve. Furthermore, the effect of interface strength between pile and soil on the load-settlement curve was also investigated. The results showed that a reduction of interface strength leads to a smaller load–settlement curve. In addition, several geotechnical engineering parameters of soil, such as the undrained shear strength and effective young's modulus, were established using data from an in-situ soil site investigation and empirical correlations with SPT-N.

Efek Gradasi Tanah Pasir Pada Penggunaan Jamur Rhizopus Oligosporus untuk Perbaikan Tanah Pasir Lepas Aswin Lim
Jurnal Aplikasi Teknik Sipil Vol 20, No 2 (2022)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Tanah pasir lepas merupakan salah satu jenis tanah dengan kuat geser tanah yang rendah. Penelitian ini menyajikan pengaruh variasi gradasi pasir lepas terhadap parameter kuat geser tanah yang dicampur dengan jamur Rhizopus oligosporus. Dalam pencampuran, jamur Rhizopus oligosporus adalah dalam bentuk ragi tempe. Sampel tanah dibuat dengan mencampurkan variasi gradasi dari tanah asli dengan air sebanyak 5% dari berat sampel dan kadar ragi sebanyak 5.24% dari berat sampel, kemudian dieramkan selama 3 hari. Pengujian dilakukan dengan berbagai variasi gradasi tanah asli untuk mengetahui gradasi terbaik yang menghasilkan nilai kuat geser yang maksimum. Hasil pengujian menunjukkan parameter kuat geser tanah maksimum adalah saat komposisi gradasi 50% fine sand dan 50% medium sand. Nilai kohesi yang diperoleh sebesar sebesar 0.59 kg/cm2 dan nilai sudut geser dalam adalah 20°. Hasil pengamatan sampel menggunakan mikroskop digital menunjukan hifa dan miselium tumbuh mengikat butiran pasir.

Investigation of Twin Tunnel Deformation with Umbrella Grouting Protection & NATM Tunneling using 3D Finite Element: Case Study Cisumdawu Tunnel Wellyanto Wijaya; Paulus Pramono Rahardjo; Aswin Lim
U Karst Vol 5, No 2 (2021): NOVEMBER
Publisher : Kadiri University

Cisumdawu Tunnel is a twin tunnel 472 m long located in Sumedang. Twin tunnel construction can cause additional ground settlement and tunnel deformation. The tunnel construction method used is the New Austrian Tunneling Method (NATM) and umbrella grouting protection system. The principle of NATM is to maximize surrounding soil capacity to support its weight and balance the stresses around the tunnel. Investigation of tunnel deformation is important to know tunnel structure behavior and avoid possible failure. This research aims to know tunnel deformation and the effect of twin tunnel construction on the deformation and ground settlement. The data used such as tunnel geometry, monitoring data, pressuremeter test, and the drilling test. The 3D analysis will be performed for a single tunnel and twin tunnel using Midas GTS-NX, and monitoring data will be used for verification analysis. The 3D FEM help to model the soil condition and construction stage according to the actual condition. The analysis results show the maximum tunnel deformation that occurs from the beginning of the tunnel construction is 12.64cm. If the deformation starts to be calculated following the monitoring reading time, after the excavation at the monitoring point, the maximum deformation of the analysis results is 3.3&4.4cm, where the monitoring shows maximum deformation of 3.3&4.3cm. Through the results, it can be said that the analysis using 3D FEM with pressuremeter test parameter represents actual conditions. Twin tunnel construction side-by-side increases ground settlement and lateral tunnel deformation significantly. Hence, it shows that tunnel analysis using 3D FEM recommends for future investigation of tunnel deformation.

Investigation of Pile Behavior Toward Abutment Construction using PLAXIS 3D: Case Study on Lembak Bridge Clinton Girsang; Paulus Pramono Rahardjo; Aswin Lim
U Karst Vol 5, No 1 (2021): APRIL
Publisher : Kadiri University

Soil as a subgrade foundation under embankment construction often creates problems in terms of stability and settlement. Therefore, it needs improvement by using preloading embankment. This article presents the investigation of pile behavior towards two scenarios of abutment construction using Plaxis 3D, a three- dimensional finite element program. The use of two scenarios of analysis was Method A. The abutment construction phase conduct without using a preloading embankment, and Method B, where a preloading embankment constructs before the abutment construction. The case study location at the Lembak bridge. Compare the analysis results with the measured data. Results showed that Method A and Method B's pile deflection yielded four times and one point six times larger than the measure data, respectively. Hence, it indicates that Method B recommends for future construction of bridge abutment.

The Determination of Downhole Dynamic Compaction Paramaters Based on Finite Element Analysis Martin Wijaya; Ahmad Kemal Arsyad; Aswin Lim; Paulus Pramono Rahardjo
Journal of the Civil Engineering Forum Vol. 8 No. 3 (September 2022)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.3467

Downhole dynamic compaction (DDC) has been commonly used in China to stabilize collapsible soil through the application of construction and demolition waste material (CDW). DDC basically forms a column inside the soil stratum which is similar to a stone column except DDC materials are put in sequence and then compacted by using DDC hammer. Due to its attractive features such as its big diameter, feasibility of using oversized material particles, rapid and simple construction technique, it is used as one of the ground improvement methods for an airport project in Indonesia. Despite of all the advantages provided by DDC, it is difficult to obtain DDC parameters from laboratory tests as it is difficult to replicate the compaction effort induced by the DDC hammer and laboratory tests are not commonly employed for oversized materials. Hence, alternative method is required to evaluate DDC parameters. In this study, static load test is conducted to determine load-deformation curve of the DDC pile. Soil parameters are first determined through soil test data such as standard penetration test (SPT), laboratory test and also pressure meter tests. Correlation between pressure meter tests and SPT test result is also carried in order to interpret the soil parameter at the site. Axisymmetric finite element analysis is then carried by using MIDAS GTS NX in order to back analyses DDC parameters by matching the simulation curve with load settlement curve of the DDC. In this paper, it is shown that back analysis using hardening soil model for DDC material can be used to match simulation curve with the load-deformation curve.

Comparison of Material Point Method and Finite Element Method for Post-Failure Large Deformation Geotechnical Analysis Arif Yunando Sunanhadikusuma; Ezra Yoanes Setiasabda Tjung; Aswin Lim
Journal of the Civil Engineering Forum Vol. 9 No. 1 (January 2023)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.3524

Finite Element Method (FEM) has been the state-of-the-art method in geotechnical analysis since it first formulated in the 40s. It capable to handle Multiphysics simulation, soil-structure and soil-water interaction, and time history analysis. Though powerful, the standard Lagrangian FEM suffers mesh distortion when handling large strain deformation problem. This mesh entanglement problem makes post-failure analysis is considerably challenging to model if not impossible to do using FEM. The Material Point Method (MPM) then later introduced to solve these large strain deformation problems. Adapted from the Particle in Cell (PIC) method, MPM is a hybrid method that combines Eularian and Lagrangian approach by utilizing moving material points which are moving over spatially fixed computational mesh. This approach enables MPM to calculate not only fluid mechanics such in PIC but also solid mechanics and its intermediatory states. To demonstrate the capability of MPM and its consistency with FEM in geotechnical analysis, this article presents a comparison of FEM and MPM analysis on a hypothetical slope using Mohr-Coulomb constitutive model. The simulation shows that both FEM and MPM analyses are consistent to each other especially in small strain scheme. However, in large strain deformation, MPM is still able to get convergent result while FEM is not. The MPM simulation is also able to animate post failure behavior clearly, calculate post-failure strains and stresses distribution, and present final geometry of the model.

Interpolation method for spatial distribution of clay content within residual soil Alfrendo Satyanaga; Aswin Lim; Nurly Gofar
Indonesian Geotechnical Journal Vol. 1 No. 1 (2022): Vol.1 , No.1, April 2022
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Residual soil is covering some parts of the tropical country such as Singapore. It is commonly known that residual soil is associated with variability either horizontally or vertically. As a result, it is necessary to have a method to determine the distribution of soil properties to minimize the need to have an excessive amount of boreholes before the commencement of the construction project. This paper presents the suitable interpolation method for the spatial distribution of clay content across Singapore island. The common term related to the spatial distribution of soil properties is called digital soil map. The selection of the best method to generate this map depends on different factors. Therefore, each case requires a thorough evaluation and comparison based on the interpolation results. Singapore's digital elevation model and its boundary were utilized in this study. A digital soil map was developed using ArcGIS software based on two interpolation methods such as ordinary kriging, and the inverse distance weighted method. These two methods were cross-validated and compared based on the regression analysis of the analyses results. Cross-validation was performed to verify the correctness of the mentioned interpolation methods. In order to validate the interpolation results, the mean error and the root mean square error were used. The results suggest that ordinary kriging could be used as a suitable method to generate the spatial distribution of clay content obtained from boreholes in Singapore.

Two-Dimensional Finite Element Analysis of Piled Raft Coefficient Settlement Ratio on Clays Christian William Munaba; Aswin Lim; Arif Yunando Soen
Indonesian Geotechnical Journal Vol. 1 No. 2 (2022): Vol.1 , No.2, August 2022
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Nowadays, designing a piled raft foundation is challenging because the behavior is three-dimensional. For some engineers, a three-dimensional analysis might not be affordable due to more costly than a two-dimensional analysis. In this study, 2D Finite element analysis – axisymmetric was used to study the piled raft foundation. The pile diameter and pile length were varied to investigate the relation between piled raft coefficient and load-settlement. In addition, the load transfer mechanism between the raft part and the pile part in clayey soils is also examined. The results show the longer the pile and the larger the diameter, the greater the load carried by the pile and the smaller the settlement. Increase in pile length by 5 m, resulting in a load transfer of 2% to 6% from a raft to pile, and reduced settlement by 2% to 3%. Furthermore, A 0.5 m increase in pile diameter results in an 8% to 25% load transfer from a raft to pile, and a 2% to 7% reduction in a settlement. The soil consistency affects the load distribution and settlement of the pile-raft foundation system. The higher the soil consistency, the smaller the amount transferred to the pile, and the higher the effectiveness of the pile in reducing the settlement that occurs.

Co-Authors Adrianus Renaldy Aglia, Grisella Ahmad Kemal Arsyad Aldrianita, Tabitha Alfrendo Satyanaga Alfrendo Satyanaga Anastasia Sri Lestari Andra Ardiana Andy Sugianto Andy Sugianto Anthonius Steven Sutanto Ardiana, Andra Arif Yunando Soen Arif Yunando Sunanhadikusuma Bobby Minola Ginting Budijanto Widjaja Budijanto Widjaja Cheryl, Monica Frances Christian William Munaba Clinton Girsang Darian, Evan Dary Aulia Muhammad David Kristian Erdian, Andreas Evan Darian Ezra Yoanes Setiasabda Tjung Fadhil, Imam Ahmad Felix Hidayat Gofar, Nurly Hartieni, Patricia Helmy Hermawan Tjahjanto Henky Muljana Henky Muljana Herry Suryadi Hizbulmalik, Ziyan Ignatius Tommy Pratama Ihut, Karolina Villa Delfia Jogiadinata, Evelyn Johannes Adhijoso Tjondro Karlinasari, Rinda Lie, Edwin Martin Wijaya Muhammad Hanif Muhammad, Dary Aulia Octavianus Arvin Sukiwan Paulus Pramono Paulus Pramono Rahardjo Prassetyo, Simon Heru Putra, Heriansyah Siska Rustiani Stefani Wiguna Suharyadi, Bambang Syifanaya, Sharfina Faradiba Sylvia Herina Theresita Herni Setiawan Varian Harwin Batistuta Verguson, Yoghi Jo Vienti Hapsari Vinna Fransiska Chou Wellyanto Wijaya Widjaja, Hasky Wijaya, Martin Wijaya, Obaja Triputera William, Octavianus Yiska Vivian Chritiansen Wijaya Yohanes Albrecht Montol Yohanes Lim Dwi Adianto Zakwan Gusnadi

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