EROSION RATE OF COMPACTED N-MONTMORILLONITE SOILS

Erosion rates of unsaturated compacted Na-montmorillonite clays are measured under a range of tractive stresses from surface flows in a rectangular flume. The degree of saturation of compacted samples ranges from 0.52-0.97. The Na-montmorillonite (Volclay bentonite)is mixed with ground silica to obtain samples with various percentages of clay. Samples of 100, 70, 40 and 10% clay content by dry weight are tested. Samples are compacted under 700 Pa into sample containers with 160-cm2 surface area and are subjected to flowing water in the flume. The results of the study show that the erosion rate of Na-montmorillonite soil samples increases when clay content decreases and is independent of compaction water content. The relationship between erosion rate and tractive stress is linear for all Na-montmorillonite samples. For the range of water content tested, an empirical relationship is developed to estimate the erosion rate of compacted Na-montmorillonite clays as a function of percent clay content and tractive stress.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339410
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Shaikh, A
  • Ruff, J F
  • Abt, S R
• Publication Date: 1988-3

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 296-305
• Serial:
  • Journal of Geotechnical Engineering
  • Volume: 114
  • Issue Number: 3
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9410

Subject/Index Terms

• TRT Terms: Compacted clays; Erosion; Moisture content; Montmorillonite; Stresses; Tractive forces; Unsaturated soils
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00465506
• Record Type: Publication
• Report/Paper Numbers: ASCE Paper 22247
• Files: TRIS
• Created Date: Feb 29 1988 12:00AM