气候变化领域集成服务门户(CCPortal): Mechanical Compaction of Crustal Analogs Made of Sintered Glass Beads: The Influence of Porosity and Grain Size

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DOI	10.1029/2020JB021321
	Mechanical Compaction of Crustal Analogs Made of Sintered Glass Beads: The Influence of Porosity and Grain Size
	Carbillet L.; Heap M.J.; Baud P.; Wadsworth F.B.; Reuschlé T.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	The fundamentals of our understanding of the mechanical compaction of porous rocks stem from experimental studies. Yet, many of these studies use natural materials for which microstructural parameters are intrinsically coupled, hampering the diagnosis of relationships between microstructure and bulk sample behavior. To probe the influence of porosity and grain size on the mechanical compaction of granular rocks, we performed experiments on synthetic samples prepared by sintering monodisperse populations of glass beads, which allowed us to independently control porosity and grain diameter. We conducted hydrostatic and triaxial compression tests on synthetic samples with grain diameters and porosities in the ranges 0.2–1.15 mm and 0.18–0.38 mm, respectively. During hydrostatic compaction, sample porosity decreased suddenly and substantially at the onset of inelastic compaction due to contemporaneous and extensive grain crushing, a consequence of the monodisperse grain size. During triaxial tests at high confining pressure, our synthetic samples failed by shear-enhanced compaction and showed evidence for the development of compaction bands. Critical stresses at the onset of inelastic compaction map out linear-shaped yield caps for the porosity-grain diameter combinations for which the critical stress for inelastic hydrostatic compaction is known. Our yield caps reinforce the first-order importance of porosity on the compactive yield strength and show, all else being equal, that grain size also exerts a first-order control and should therefore be routinely measured. Our study further reveals the suitability of sintered glass beads as analogs for crustal rocks, which facilitate the study of the deconvolved influence of microstructural parameters on their mechanical behavior. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	grain size; mechanical compaction; porosity; sintering; synthetic rocks
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187251
作者单位	Institut Terre et Environnement de Strasbourg, Université de Strasbourg, CNRS UMR 7063, Strasbourg, France; Department of Earth Sciences, Science Labs, Durham University, Durham, United Kingdom
推荐引用方式 GB/T 7714	Carbillet L.,Heap M.J.,Baud P.,et al. Mechanical Compaction of Crustal Analogs Made of Sintered Glass Beads: The Influence of Porosity and Grain Size[J],2021,126(4).
APA	Carbillet L.,Heap M.J.,Baud P.,Wadsworth F.B.,&Reuschlé T..(2021).Mechanical Compaction of Crustal Analogs Made of Sintered Glass Beads: The Influence of Porosity and Grain Size.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Carbillet L.,et al."Mechanical Compaction of Crustal Analogs Made of Sintered Glass Beads: The Influence of Porosity and Grain Size".Journal of Geophysical Research: Solid Earth 126.4(2021).