Compressional behavior of clayey sand and transition fines content


Monkul M. M., ÖZDEN G.

ENGINEERING GEOLOGY, vol.89, pp.195-205, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 89
  • Publication Date: 2007
  • Doi Number: 10.1016/j.enggeo.2006.10.001
  • Journal Name: ENGINEERING GEOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.195-205
  • Keywords: clay, sand, soil fabric, compression, void ratio, shear stress, SHEAR-STRENGTH, COMPRESSIBILITY BEHAVIOR, UNDRAINED BEHAVIOR, TEXTURAL POROSITY, NONPLASTIC FINES, LOOSE SANDS, LIQUEFACTION, MICROSTRUCTURE, MIXTURES, STRESS
  • Dokuz Eylül University Affiliated: Yes

Abstract

Clayey sand can be considered as a composite matrix of coarse and fine grains. The interaction between coarser and finer grain matrices affects the overall stress-strain behavior of these soils. Intergratrular void ratio, e, (which is the void ratio of the coarser grain matrix) can be utilized as an alternative parameter to express the compressive response of such soils. Oedometer tests conducted on reconstituted kaolinite-sand mixtures indicate that initial conditions, percentage of fines, and stress conditions influence the compression characteristics evidently. Tests showed that, up to a fraction of fines, which is named as transition fines content (FC1), compression behavior of the mixtures is mainly controlled by the sand grains. When concentration of fines exceeds FC1, kaolinite controls the compression. It was found that FC, varies between 19% and 34% depending on the above mentioned factors. This range of fines content is also consistent with various values reported in literature regarding the strength alteration. Performed direct shear tests revealed that there is also a close relationship between transition fines content and shear strength, which is ham-ionic with the oedometer test results. (c) 2006 Elsevier B.V. All rights reserved.