Influence of early diagenesis on geotechnical properties of clay sediments (Romania, Black Sea)
| العنوان: | Influence of early diagenesis on geotechnical properties of clay sediments (Romania, Black Sea) |
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| المؤلفون: | Sebastien Garziglia, Nabil Sultan, Ewan Pelleter, Vincent Riboulot, Samuel Toucanne, Stephan Ker, Gregory Ballas, Tania Marsset |
| المساهمون: | Géosciences Montpellier, Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Université des Antilles (UA)-Centre National de la Recherche Scientifique (CNRS), Unité de recherche Géosciences Marines (Ifremer) (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) |
| المصدر: | Engineering Geology (0013-7952) (Elsevier Science Bv), 2018-06, Vol. 240, P. 175-188 Bulletin of Engineering Geology and the Environment Bulletin of Engineering Geology and the Environment, Springer Verlag, 2018, 240, pp.175-188. ⟨10.1016/j.enggeo.2018.04.019⟩ |
| بيانات النشر: | Elsevier Science Bv, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | 0211 other engineering and technologies, 02 engineering and technology, 010502 geochemistry & geophysics, 01 natural sciences, Sulfur cement, chemistry.chemical_compound, Shear strength (soil), Cohesion (geology), Geotechnical engineering, Sulfate, [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology, Early diagenesis, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Lacustrine clay sediment, Carbonate cement, Structured material Sulfur cement, Structured material, Sulfur cycle, Geology, Weak layer, Geotechnical Engineering and Engineering Geology, Cementation (geology), Diagenesis, chemistry, Anaerobic oxidation of methane, Carbonate |
| الوصف: | International audience; The geotechnical properties of clay sediments were investigated using laboratory and in-situ measurements as part of the geohazard assessment in the Romanian sector of the Black Sea affected by landslides and seafloor deformation features. The sediments were characterized as predominantly high plastic silty clay of high compressibility, low undrained shear strength, low cohesion and moderate sensitivity. A shallow increase in shear strength exceeding the general trend could have been reconciled with evidence for the precipitation of iron sulfides and calcium carbonates related to early diagenetic reactions of sulfate reduction (e.g. cryptic sulfur cycle) and anaerobic oxidation of methane. Comparison of the compression behaviour of natural and reconstituted samples indicated that precipitation of these materials at particle contacts produced cementation. The analysis of deeper sediments sharing similar geochemical properties illustrated that the early precipitation of even low quantity of sulfur and carbonate cements allowed clays to develop sufficient strength to preserve an abnormal high water content even under tens of meters burial depth. Because this cementation process was observed to be associated with an enhanced sensitivity and a strain softening response to undrained shearing it was concluded that such early diagenesis should be considered as a key environmental factor, leading to weak layer formation that may influence the susceptibility of seafloor to failure. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1435-9529 1435-9537 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e2291b814625dc92b34066af32b79ceTest https://archimer.ifremer.fr/doc/00439/55064Test/ |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....7e2291b814625dc92b34066af32b79ce |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14359529 14359537 |
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