EFFECT OF THE INITIAL STATE OF SKELETAL-CLAY SOIL ON ITS DEFORMABILITY AND STRENGTH

A comprehensive study is made of the mechanical properties of clay at different stages of load resistance in a state of triaxial compression. The general scheme for selecting the initial state to be used when constructing high-head dams is outlined. Initial stress states were determined, and experiments for studying the mechanisms of stress-strain state development in the prelimiting region in the state of limit equilibrium and subsequent flow were carried out in a triaxial apparatus. Special attention was devoted to an investigation of dilatancy. The plastic volumetric change corresponding to isotropic compression is discussed, and the mathematical investigations are detailed. The effect of loading conditions is considered. The results of the investigation of the mechanical properties is applied to an evaluation of the effect of the initial state of clay soils (artifically compacted during placement) on the strength and deformability of the core of high-head dams. The study shows that isotropic compression of the soil decreases by 2-2.4 times upon an increase in the density from 2.04 g/cubic centimeter to 2.4 g/cubic centimeter. Such a volumetric change corresponds to a 3-4 times increase of isotropic shrinkage. Also considerable is the effect of initial compaction on deformability during the deviator stage of development of the trajectory.

• Supplemental Notes:
  • Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 12, pp. 19-27, December 1975.
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Lomize, G M
  • Fedorov, V G
• Publication Date: 1975-12

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 1153-65
• Serial:
  • Hydrotechnical Construction
  • Issue Number: 12
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Clay; Compression; Dams; Deformation; Deformation curve; Dilatancy; Mechanical properties; Properties of materials; Shrinkage; Soils; Volume changes
• Uncontrolled Terms: Soil deformation; Soil properties; Triaxial compression
• Old TRIS Terms: Initial conditions
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00142983
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 22 1976 12:00AM