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All Journal Jurnal Ilmiah MITSU (Media Informasi Teknik Sipil Universitas Wiraraja) Sinergi Teknisia The Spirit of Society Journal : International Journal of Society Development and Engagement Jurnal Abdi Insani Abdimas Galuh: Jurnal Pengabdian Kepada Masyarakat Reswara: Jurnal Pengabdian Kepada Masyarakat Jurnal Cahaya Mandalika Journal of Civil Engineering and Vocational Education Jurnal Teknik Sipil dan Perencanaan KREATIF: Jurnal Pengabdian Masyarakat Nusantara
Desiana Vidayanti
Universitas Mercu Buana
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Stress-strain behavior and residual strength of Petobo sand with variable fines content under consolidated undrained triaxial loading Vidayanti, Desiana; Rahardjo, Paulus Pramono; Nazir, Ramli
SINERGI Vol 30, No 1 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2026.1.025

Abstract

Liquefaction was one of the primary causes of severe ground deformation during the 2018 Palu earthquake, particularly in the Petobo area, where large-scale flow liquefaction resulted in extensive ground displacement. Despite extensive field investigations, laboratory-based residual shear strength data for Petobo soil had not been available to explain the exceptional mobility of the flowslide. This study investigated the stress-strain response and post-liquefaction residual strength of Petobo silty sand with variable fines content using monotonic consolidated undrained (CU) triaxial tests. Reconstituted specimens were prepared using the moist tamping method with fines contents of approximately 9% and 26.4% and tested under three levels of initial mean effective stress. The results showed that specimens with higher fines content generated excess pore water pressure more rapidly and exhibited stronger contractive behavior at small strains. At large strains, however, both fines contents mobilized comparable residual strength levels, expressed as normalized residual strength ratios (qres/p’0) ranging from 0.79 to 0.94. These findings indicate that while fines content influenced early-stage contractive behavior and pore-pressure generation, its effect on post-liquefaction residual strength under very loose density conditions was limited. The residual shear resistance was primarily governed by the loose sand fabric and the effective stress level at the stabilized post-peak condition. This study provides the first laboratory-based residual shear strength data for Petobo silty sand, offering essential parameters for back-analysis, numerical modeling, and liquefaction hazard assessment related to flow-type deformation in Palu and similar alluvial environments. 
Co-Authors Acep Hidayat Agista, Shella Agung Wahyudi Biantoro Anizar Anizar Anizar Anizar Baskara Widy Artyanto Putro Belfa Yulita Nur Asifah Budi Susetyo Citra, Zel Daru Asih Dewi Murtiningsih Fitriani, Eka Nur Hernandi, Safadzia Indriany, Syilvia Irriene Indah Susanti Jawu, Patricia Kanicia Komerdevi, Det Malinda, Yosie Mawardi Amin Mirnayani, Mirnayani Muhammad Isradi Nazir, Ramli Oties T Tsarwan Paulus Pramono Rahardjo Pintor Tua Simatupang Prihadmadi Anggoro Seno Ramli Nazir Ratnaningsih Ratnaningsih, Ratnaningsih Wiwitwijaya, Sulung Yulita, Belfa