The open metastable structure of a collapsible sand: fabric and bonding

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• 作者：Margherita Zimbardo ; Laura Ercoli…
• 关键词：Unsaturated collapsible sand ; Petrographical and chemical analysis ; Fabric and bonding ; Microstructure and porosity ; Matric suction
• 刊名：Bulletin of Engineering Geology and the Environment
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：75
• 期：1
• 页码：125-139
• 全文大小：3,750 KB
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• 作者单位：Margherita Zimbardo (1)
  Laura Ercoli (1)
  Bartolomeo Megna (1)
  
  1. Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali (DICAM), University of Palermo, Viale delle Scienze ed. 8, 90128, Palermo, Italy
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Applied Geosciences
  Structural Foundations and Hydraulic Engineering
  Geoecology and Natural Processes
  Nature Conservation
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-9537

文摘

This paper deals with the compositional and textural characteristics determining open metastable structures in the pleistocenic sand outcropping in the Agrigento district (Sicily). The aim of the study was to individuate the bonding types occurring between grains that could generate matric suction phenomena. The composition and microfabric were characterised by means of granulometry, porosimetry, permeability, optical and ESEM-EDS microscopy, thermogravimetry and XR diffractometry, electric conductivity, and ionic chromatography. The data thus acquired show that the skeleton of the sand is constituted mostly by bioclasts and microfossils, calcite and quartz monocrystalline grains. Moreover, assemblages of silt and clay minerals are interposed among them. Cementation is generally absent even at the sites of contact between grains. Porosity is due mainly to interparticle voids. The spatial arrangement of sand, silt and limey grains, the pore geometry, volume and size distribution and network connectivity allow both capillary condensation and effective capillary transport of water. It appears that bonding is due mainly to capillary forces related to the texture and to the type of pores rather than being ruled by composition. Keywords Unsaturated collapsible sand Petrographical and chemical analysis Fabric and bonding Microstructure and porosity Matric suction