Volume 19, Issue 5 (English articles 2025)
2025, 19(5): 677-696 |
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Namavar E. Extending geotechnical classification using excavation stability data in fine-grained alluvial deposits. Journal of Engineering Geology 2025; 19 (5) :677-696
URL: http://jeg.khu.ac.ir/article-1-3179-en.html
URL: http://jeg.khu.ac.ir/article-1-3179-en.html
Department of civil engineering, Faculty of engineering , namavaremad@gmail.com
Abstract: (2191 Views)
Accurate geotechnical classification is essential for designing excavations in urban environments, where soil behavior is greatly affected by excavation-induced stresses. This study improves the geotechnical characterization of fine-grained alluvial deposits belonging to the youngest sedimentary unit (Unit D) in Rieben’s classification system. A comprehensive investigation was conducted through borehole drilling, Standard Penetration Tests (SPT), pressuremeter testing, and laboratory experiments including triaxial, uniaxial, and direct shear tests. Excavation stability was evaluated using the Morgenstern–Price method under both short-term and long-term conditions. Based on the geotechnical parameters and slope stability simulations, Unit D was subdivided into three distinct zones (D1, D2, and D3) with different excavation behaviors. Zone D1, characterized by lower sand content, allows deeper vertical cuts, whereas the presence of sandy lenses in Zone D3 restricts excavation depth and requires gentler slopes. The findings provide an updated geotechnical classification framework for fine-grained alluvia, offering practical guidelines for safe excavation design and contributing to the broader understanding of alluvial systems in urban geotechnical engineering.
Keywords: Geotechnical classification, excavation stability, Morgenstern–Price method, alluvial deposits.
Type of Study: Original Research |
Subject:
Engineering Geology
Received: 2025/09/18 | Accepted: 2025/10/11 | Published: 2026/12/31
Received: 2025/09/18 | Accepted: 2025/10/11 | Published: 2026/12/31
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