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All Journal TEKNIK MEDIA KOMUNIKASI TEKNIK SIPIL Sinergi Jurnal Geoteknik Semesta Teknika Civil Engineering Dimension Civil Engineering Journal Journal of the Civil Engineering Forum Journal of Engineering and Technological Sciences
Agus Setyo Muntohar
Universitas Muhammadiyah Yogyakarta
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering

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Evaluation of the Consolidation Parameters Obtained from Laboratory Tests for Numerical Modeling of Improved Soft Soil Using PVD at Semarang - Demak Toll Road, Indonesia Sari, Undayani Cita; Wardani, Sri Prabandiyani Retno; Muntohar, Agus Setyo; Partono, Windu
Journal of Engineering and Technological Sciences Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.2.5

Abstract

The consolidation analysis becomes complicated when conducted on varying layers of soil. To simplify and solve these problems, designers often employ Finite Element Method (FEM) modeling, a widely used technique for analyzing geotechnical issues. However, many limitations associated with this method can lead to model results that do not accurately reflect actual conditions. Consequently, the consolidation settlement analysis during design may differ from actual conditions in the field. This study examines the influence of consolidation parameters and explores how to analyze consolidation settlement using FEM for practical applications. Specifically, consolidation settlement was assessed on the Semarang-Demak toll road, which utilizes a Preloading-PVD improvement method across nine Stationing (STA) locations with varying soil layers. Numerical modeling was performed using Midas GTS NX 2021 (V.1.1) and was validated against instrumentation observation results, Settlement Plate. An evaluation using the back analysis method was conducted to investigate the impact of consolidation parameters on the accuracy of the final consolidation settlement results. The consolidation parameters reviewed are the compression index (Cc) and recompression index (Cr). The findings indicate that the Cc and Cr significantly influence the final consolidation settlement. By optimizing these consolidation parameter values, the deviation between observed results and numerical modeling for final consolidation settlement is reduced to less than 1%. Additionally, this research derived empirical equations for calculating consolidation parameters based on the Liquid Limit, a fundamental laboratory test. The results of this study can be proposed to analyze consolidation settlement using FEM modeling for soft clay to stiff clay, providing valuable insights for practical applications.
Interpretasi Ukuran Kolom Grouting Geopolymer Menggunakan Metode Resistivitas Sumiyanto, Sumiyanto; Muntohar, Agus Setyo; Wardani, Sri Prabandiyani Retno
TEKNIK Vol 45, No 2 (2024): August 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i2.61831

Abstract

Pada injeksi grouting, ukuran kolom grouting merupakan indikator penting untuk mengevaluasi keberhasilan penyebaran dan sementasi grouting. Pada penelitian di laboratorium, pengukuran kolom grouting dapat dilakukan dengan memisahkan antara kolom grouting dan tanah. Namun demikian, metode ini bersifat merusak dan hanya cocok untuk penelitian, sehingga tidak dapat diterapkan di lapangan. Metode resistivitas bersifat tidak merusak dan berhasil digunakan untuk interpretasi formasi batuan dyke. Formasi dyke ini mempunyai kemiripan dengan kolom grouting, sehingga metode resistivitas berpotensi dikembangkan untuk interpretasi ukuran kolom grouting. Berdasarkan pertimbangan tersebut, penelitian dilakukan untuk mengembangkan metode resistivitas sebagai metode interpretasi ukuran kolom grouting. Penelitian dilakukan di laboratorium menggunakan tanah clay shale yang diinjeksi grouting geopolymer. Berdasarkan hasil data pengukuran resistivitas dilakukan inversi untuk menggambarkan profil resistivitas benda uji, menggunakan software Res2dinv. Profil resistivitas pada umur 28 hari menghasilkan interpretasi ukuran kolom grouting yang akurat karena terdapat perbedaan resistivitas yang besar antara tanah dan kolom grouting. Hasil penelitian ini memberikan peluang metode resistivitas untuk kembangkan lebih lanjut sebagai metode interpretasi ukuran kolom grouting dan berpotensi untuk diterapkan di lapangan.
Evaluation of Infiltration Models with Double Ring Infiltrometer Test on Residual Soil in Kulonprogo, Indonesia Muntohar, Agus Setyo; Ikhsan, Jazaul; Setiati, Rehni; Uzuoka, Ryosuke
Civil Engineering Dimension Vol. 27 No. 2 (2025): SEPTEMBER 2025
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.27.2.193-202

Abstract

The hydraulic conductivity of soil is an essential parameter for evaluating the slope instability triggered by rain infiltration. This research uses a Double-Ring Infiltrometer (DRI) at five locations to estimate the hydraulic conductivity from a field infiltration test. Four infiltration models were examined to estimate hydraulic conductivity, including Green–Ampt, Kostiakov, Horton, and Philips equations. Curve fitting on the infiltration rate–time plots were computed with the least square error to determine the infiltration parameters using Levenberg–Marquardt algorithm. The basic infiltration rate ranges from 6.88 mm/h to 721.5 8 mm/h.  The Horton and Philips infiltration model provides better statistical performance to estimate the infiltration rate. The estimated hydraulic conductivity from the four infiltration models results in a relative convergence value; however, the estimation results in more biased hydraulic conductivity at locations containing clay fraction and high-plasticity silt, especially for Green–Ampt and Philip infiltration models.
Effect of Air Pressure on Changes in Parameters and Soil Settlement Behavior in Very Soft Soils Sutarman, Encu; Wardani, Sri Prabandiyani Retno; Muntohar, Agus Setyo
Civil Engineering Journal Vol. 11 No. 12 (2025): December
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-12-020

Abstract

An effective soil improvement method is essential in soft soil due to the poor bearing capacity for construction loads. To address the challenge, the use of the staged air pressure method with Suction Assisted Vacuum Preloading (SAVP) has shown significant potential when applied through Geosystem Air Booster Vacuum Preloading (GAVP), specifically designed with a sensor system as a real-time measuring tool for soil parameter changes. Therefore, this research aims to examine the effectiveness of the SAVP method in relation to the discharge of drained water from prefabricated vertical drains (PVD) on changes in soil parameters due to air pressure and vacuum using the GAVP tool. The method used five PVDs in large-diameter soil sample tubes, applying air pressure and vacuum simultaneously and selectively. This experimental setup was designed to examine the fundamental aspects of soil parameter changes, namely permeability, consolidation, and volume compression coefficient. The results showed that soil parameters during testing interacted with each other, where air pressure balanced with vacuum caused changes and optimized settlement and consolidation efficiency. Decreasing air pressure enhanced vacuum performance, causing a corresponding rise in soil settlement and consolidation degree. However, increasing air pressure decreased soil settlement and the degree of consolidation.
Unconfined Compressive Strength and Damage Evolution in Geopolymer-Stabilized Clay Shale: Role of Temperature and Alkali Activator Ratio Diana, Willis; Hartono, Edi; Muntohar, Agus Setyo; Abiyoga, Nurza Purwa
Journal of the Civil Engineering Forum Vol. 12 No. 2 (May 2026)
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.22477

Abstract

Exposed clay shale is highly susceptible to weathering and rapid strength degradation, which often leads to slope and earth-structure instability. Geopolymer-based soil stabilization has emerged as a promising method to improve the mechanical properties of such problematic materials. However, this chemical stabilization process is sensitive to environmental conditions, particularly temperature fluctuations. The performance of geopolymer-stabilized clay shale under elevated-temperature conditions remains insufficiently investigated, particularly in tropical regions such as Indonesia, where temperatures can fluctuate between 25◦C and 40◦C, and the exposed ground surface may reach up to 60◦C during the dry season because of intense solar radiation. This study evaluates the effectiveness of fly ash–based geopolymer in stabilizing clay shale under temperature variations ranging from 26◦C to 60◦C. A series of laboratory experiments was conducted using two alkali activator ratios (Na2SiO3:NaOH), namely 2.0 (Ratio A) and 2.5 (Ratio B). Mechanical performance was assessed through unconfined compressive strength (UCS) tests, stress–strain analysis, and energy-based damage evolution to quantify strength development and failure behavior. The results indicate that temperature is the dominant factor controlling strength development. A 10◦C increase in curing temperature resulted in a 40–60% increase in UCS, whereas variations in the alkali activator ratio produced only a 15–20% increase. The highest strength amplification, reaching 16 times that of untreated soil, was achieved using Ratio B at 60◦C, while Ratio A showed strength stagnation above 50◦C. Microstructural observations suggest that elevated temperatures accelerate geopolymer gel formation, leading to higher initial stiffness and an expanded elastic region. However, this also resulted in more brittle behavior, characterized by a higher brittleness index and rapid post-peak damage propagation for Ratio B, whereas Ratio A exhibited greater ductility. Overall, higher curing temperatures increased the dissipated energy at failure and revealed a clear strength–ductility trade-off. These findings provide insights for optimizing geopolymer stabilization of clay shale, particularly for geotechnical applications in tropical environments where elevated in situ temperatures are common.
Evaluasi Pemadatan Tanah pada Proyek Pembangunan Gedung Diana, Willis; Hartono, Edi; Muntohar, Agus Setyo; Wulandary, Kartika
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 28, Nomor 1 (2022)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (604.443 KB) | DOI: 10.14710/mkts.v28i1.32720

Abstract

Pemadatan tanah merupakan salah satu metode yang efisien dan praktis untuk meningkatkan kekuatan dan mengurangi kompresibilitas pekerjaan tanah. Namun, pekerjaan pemadatan harus dievaluasi untuk memenuhi persyaratan relatif terhadap berat volume kering maksimum (MDD) yang diperoleh dari uji pemadatan standar laboratorium. Umumnya metode yang digunakan untuk evaluasi kepadatan lapangan adalah uji kerucut pasir. Tujuan utama dari penelitian ini adalah untuk mengetahui kepadatan relatif tanah timbunan pada konstruksi bangunan dengan menggunakan uji kerucut pasir. Prosedur pengujian mengikuti ASTM D1556 / D1556M-15e1 dan ASTM D698-12e2 untuk uji kerucut pasir dan uji pemadatan standar Proctor. Analisis statistik dilakukan untuk mengevaluasi kepadatan dan kadar air yang diperoleh dari uji lapangan pada proyek Dorm dan Research and Inovation Centre (RIC). Probabilitas (p) pekerjaan pemadatan yang melebihi 0,9MDD atau Rc=90% adalah p=13% dan p=18%. Hasil pengujian menunjukkan bahwa pemadatan relatif rata-rata (Rc)  adalah 80% dan 82% pada proyek Dorm dan RIC dengan standar deviasi 8,69 dan 8,81.
Co-Authors Abiyoga, Nurza Purwa Anita Widianti Ario Muhammad, Ario Edi Hartono Hemeto, Abd. Dzargifar Indriani, Lia Jazaul Ikhsan Muhammad Azhar Roslan Hashim, Roslan Setiati, Rehni Sri Prabandiyani Retno Wardani Sutarman, Encu Undayani Cita Sari Uzuoka, Ryosuke Willis Diana Windu Partono Wulandary, Kartika