A description of internal erosion by suffusion and induced settlements on cohesionless granular matter

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• 作者：Luc Sibille ; Didier Marot ; Yacine Sail
• 关键词：Erodimeter ; Flow power ; Granular media ; Internal erosion ; Suffusion
• 刊名：Acta Geotechnica
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：10
• 期：6
• 页码：735-748
• 全文大小：7,595 KB
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• 作者单位：Luc Sibille (1) (2)
  Didier Marot (1)
  Yacine Sail (1)
  
  1. Institut GeM, UN-ECN-CNRS, Nantes Universit茅, 44600, Saint-Nazaire, France
  2. CNRS, 3SR, Universit茅 Grenoble Alpes, 38000, Grenoble, France
  
• 刊物类别：Engineering
• 刊物主题：Continuum Mechanics and Mechanics of Materials
  Geotechnical Engineering
  Soil Science and Conservation
  Granular Media
  Structural Mechanics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1861-1133

文摘

Cohesionless granular matter subjected to internal flow can incur an internal erosion by suffusion characterized by a migration of its finest constituting particles. A series of suffusion tests is performed on assemblies of gap-graded glass beads using a large oedo-permeameter device. Two successive processes of erosion can be observed during the tests. First, a suffusion process is characterized by a progressive and diffuse migration of fine particles over a long time period. The second process, induced by the first one, is characterized by a strong migration over a short time period (blowout of fine particles) and produces rapidly large settlement of specimen. Time series of hydraulic conductivity, longitudinal profile of specimen density, eroded mass and axial deformation are analyzed. The initial content of fine particles and the history of hydraulic loading appear as key parameters in the suffusion development. To characterize the suffusion development, erosion rate is investigated according to the power expended by the seepage flow, and a new law of erosion by suffusion is proposed. Keywords Erodimeter Flow power Granular media Internal erosion Suffusion