DEFINITION OF TERMS RELATED TO LIQUEFACTION

The scope of the paper is actually narrower than its title would suggest i.e. the definition of terms related to the liquefaction of cohesionless soil-water systems as a consequence of increased pore pressure and reduced effective stress. A considerable amount of knowledge and terminology available on the liquefaction of several important systems (e.g., noncohesive soil-sand, gravel, etc-in the dry state with particle interstices filled by air or other gases, or empty as approximated on the moon; cohesive soil-water systems possessing thixotropic characteristics such as the Norwegian marine clays and weakly cemented dry soil systems) are disregarded. The formation of a new Committee on Soil Liquefaction with members whose interests cover the entire field is recommended. Several specific recommendations concerning the definitions are made. A global definition of "liquefaction" is preferable, such as failure of a granular soil mass due to pore pressure increase (A reservation can be added to exclude failure due to external hydraulic agencies.) "Cyclic strain softening" suggests strain softening as in a plastic material. However, softening is not produced by strains but by pore pressure increase. Hence, the term should be dropped. The term "full or 100% pore pressure ratio" should be discarded, since this condition is neither necessary nor sufficient for liquefaction. A more consistent definition of "shear strength" is possible, i.e. relevant shear stress component in a state of continued shear deformation that is incrementally stationary. Regarding the term "unlimited flow strain", it is noted that if the flow is unlimited, strains are necessarily undefined.

  • Availability:
  • Supplemental Notes:
    • Discussion of ASCE Paper 14037 (September 1978).
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Discussers:
    • Winterkorn, H F
    • GUDEHUS, G
  • Publication Date: 1979-5

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00196146
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 14549 Proceeding
  • Files: TRIS
  • Created Date: Oct 17 1979 12:00AM