Collapse Behavior of Compacted Silty Clay in Suction-Monitored Oedometer Apparatus

This paper presents a methodology to investigate the collapse behavior of unsaturated soils using suction-monitored oedometer tests. By incorporating independent suction measurement, the oedometer apparatus is capable of following the same stress paths as in double oedometer tests, while continuously monitoring the suction. The proposed method has been used to investigate the collapse behavior of a compacted silty clay and to confirm the uniqueness of the loading-collapse surface as identified from loading and wetting paths. A new mathematical form of the yield surface within an elastoplastic framework is proposed on the basis of test results over a wide range of suctions (0 to 30,000 kPa) and net stresses (up to 7,000 kPa). The fundamental assumptions of the newer type of elastoplastic framework, which incorporate the degree of saturation within their stress variables, are evaluated, and the limitations of such models are identified. The collapse behavior of samples with different fabrics induced by differing compaction characteristics is also investigated within an elastoplastic framework. The difference in fabric, which is observed through a petrological microscope, can be presented in a quantitative way with different model parameters.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3519342
• Authors:
  • Jotisankasa, Apiniti
  • Ridley, Andrew
  • Coop, Matthew
• Publication Date: 2007-7

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Illustrations; Photos; References; Tables;
• Pagination: pp 867-877
• Serial:
  • Journal of Geotechnical and Geoenvironmental Engineering
  • Volume: 133
  • Issue Number: 7
  • Publisher: American Society of Civil Engineers
  • ISSN: 1090-0241
  • Serial URL: http://ojps.aip.org/gto

Subject/Index Terms

• TRT Terms: Collapse; Collapsible soils; Compacted clays; Deformation; Elastoplasticity; Load tests; Mathematical methods; Mathematical models; Measurement; Oedometers; Percent saturation; Plastic deformation; Saturated soils; Silty clays; Soil suction; Soil tests; Unsaturated soils
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 01053975
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 20 2007 9:56AM