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All Journal Jurnal Mahasiswa Jurusan Teknik Sipil Rekayasa Sipil Civil Engineering Journal Civil and Environmental Science Journal (CIVENSE)
Eko Andi Suryo
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Environmental Science

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Journal : Civil Engineering Journal

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Subsurface Mapping and Geotechnical Design for Landslide Mitigation Hasan, Muhammad Fathur Rouf; Susilo, Adi; Sutan Haji, Alexander T.; Suryo, Eko Andi; Agung, P. A. Maha; Idmi, Mohammad Habibiy; Musta, Baba
Civil Engineering Journal Vol. 11 No. 9 (2025): September
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-09-015

Abstract

The landslide near the PT Molindo Incinerator Unit poses a significant threat to the facility’s structural integrity. Without immediate mitigation measures, the incinerator building is at risk of collapse, potentially impacting adjacent settlements due to cascading structural failures. To reduce the risk of further instability, urgent geophysical investigation is required to characterize the subsurface lithology and assess the groundwater table conditions. A geoelectrical resistivity survey was conducted using the Schlumberger configuration across 8 measurement points along a 100-meter survey line, with 10-meter electrode spacing. The resistivity measurements ranged from 3.30 to 25 Ωm, which were interpreted as clay-rich layers; 26 to 167 Ωm, corresponding to sandy clay; and 167 to 15,944 Ωm, indicating bedrock. The potential slip zone is interpreted at an average depth of 20 to 25 meters, indicated by very low resistivity values with resistivity values between 3.30 and 25 Ωm. Field observations confirmed that the landslide materials predominantly consisted of clay soils, distributed within two distinct layers beneath the incinerator unit. The combined depth of the clay and overlying sandy layers was estimated to reach approximately 20-25 meters from the ground surface. To ensure the effectiveness of structural mitigation, a retaining wall must be designed to extend beyond this depth threshold. Numerical simulations using Slope/W software indicated that soil nailing techniques yielded safety factors ranging from 1.32 to 1.81 under static conditions and 1.22 to 1.43 under dynamic conditions. Predicted deformations ranged from 0.01 to 0.02 meters (static) and 0.02 to 0.03 meters (dynamic). These results suggest that soil nailing is a viable reinforcement method to stabilize slope movements, particularly during periods of high rainfall. Additional recommended mitigation strategies include the installation of surface and subsurface drainage systems to control water flow, constructing retaining structures to serve as physical barriers to soil movement, and using vegetative cover to enhance slope stability.
Co-Authors ., Imanuddin ., Lestari Adi Susilo Agriansyah, Eza Agung, P. A. Maha Agus Suharyanto Akbar, Muhammad Al Islami, Auliya Nusyura Ali Abdullah, Ali Alif, Faisal Abda Allo, Angeline Grace Alwafi Pujiraharjo Aqim, Angga Qinwanul Arief Rachmansyah Arief Rachmansyah Arthayoga Bendesa, Dimas Januar Arviananda, Ovy Ellen Bayu Tri Hardianto Berliana Ganesha Restuputri Christon, Hosea Adyo Cintya, Febrina Sagita Dieng Permana, Mochamad Amin Dwi Krisna, Septiyan Candra Dwi Edhi Wahyuni Setyowati Ella Candrawati Eva Arifi F, T Fadh, Ghulam Aghnia Fakhrozy, Rizky Faradillah Sheni Putri Amalia Farandy, Fairuz Ikbar Fauzi Rizky, Adi Widia Nur Firdaus, Adelina Maulidya Firdaus, Reza Novianda Gabrielle Satriyo Bayu Adinugroho H, Fadel Fadel Muhammad Hadiatma, Agvin Hanif Akbar Rabbany Harimurti Harimurti . Harimurti Harimurti Hasyim Alhadar Ibnu Tsauri Pradana Idmi, Mohammad Habibiy Indradi Wijatmiko Isadur Rofiq Iswara Elsam, Kevin Raditya Karimah, Maslin Akhlaqul KARTIKA PUSPA NEGARA Kartika Puspa Negara Kusumawati, Nafisah Octa Laras, Ario Widio M. Hamzah Hasyim M. Hamzah Hasyim M. Ruslin Anwar Ma’azza, Muhammad Ainun Maharani, Kharisma Tria Mahendra, Anfasa Tifani Minata, Afria Nurizky Mohammad Ichsanul Fikar Muhammad Akbar Tafzila Janika Muhammad Fathur Rouf Hasan Muhammad Hamzah Hasyim Mulyadi, Faqih Syahputra Munawir, As'ad Munawir, As’ad Musta, Baba Natalia, Karisa Ratih Nindia Rizky Ismawan Nugroho, Cendana Putri Nur Arifin, Hadi Mizan Nur Fadli, Aji Gigih Pramesthi, Shifa Ardhelia Pramudiyanto, Andi Pratama Yohanes, Raphael Eldy Pratama, Dicky Rosian Prihatama, Wirawan Yuda Purwowaskito, Danu Putra, Muhamad Darmawan Putranto, Arif Rahman Rizkishoiful Kodri Rohmatillah, Siti Saidah, Heni Dewi Saifoe El Unas Shafira, Nisa Shofy Azizah Sirait, Solapida Glenesya Solikah, Vika Badius Stanislasia Pratiwi Bayu Ningtyas Andreani Suhartono, Gerrie Sulistyo, Herlambang Bagus Suroso . Suryono, Devi Sutan Haji, Alexander T. Tejokusumo, Radius Suryajaya Thiya Fianti Tiantara, Salma Fidela Tri Kurniawati, Tri Wahyu Nugraha, Aviantara Wibisono, Gunawan Widagdo, Yanuar Eko Wijaya, Theo Mahendra Yulvi Zaika Yulvi Zaika Zain, M. Nuhkhalid Zubaedah, Endah