ENGINEERING DESIGN IN LOESS SOILS OF SOUTHEASTERN WASHINGTON. FINAL REPORT

Part I of this report focuses on the comparison of strength parameters of the loess soils of southeastern Washington obtained by laboratory triaxial shear testing and in situ testing using the Iowa Borehole Shear Test (IBST). Also, the disturbance of samples due to sampling technique is addressed. Loess samples tested with the IBST generally produce a lower cohesion but higher friction angle than if the same soils were tested by a UCU triaxial test. Also, the IBST produces a higher cohesion and a lower friction angle than a CU test. The failure envelopes tend to merge at higher normal stresses. Part II of this report suggests drainage schemes to protect cut slopes in loess from rapid deterioration by erosion. This part of the report is a continuation of work completed under an earlier contract (WA-RD-69.1). Specific drainage schemes to divert surface water around or over cut slopes in loess are discussed.

• Record URL:
  • http://www.wsdot.wa.gov/research/reports/fullreports/145.1.pdf
• 
• Corporate Authors:

  Washington State University, Pullman

  Washington State Transportation Center
  Pullman, WA  United States  99164

  Washington State Department of Transportation

  Transportation Building, 310 Maple Park Avenue SE, P.O. Box 47300
  Olympia, WA  United States  98504-7300

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Higgins, J D
  • FRAGASZY, R J
  • MARTIN, T
• Publication Date: 1987-12

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 133 p.

Subject/Index Terms

• TRT Terms: Boreholes; Cohesion; Drainage; Embankments; Environmental engineering; Erosion; Field tests; Friction; Laboratory tests; Loess; Sampling; Shear stress; Shear tests
• Uncontrolled Terms: Friction angle
• Old TRIS Terms: Engineering, erosion control; Insitu methods; Loess soils; Triaxial shear
• Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology; I42: Soil Mechanics;

Filing Info

• Accession Number: 00468203
• Record Type: Publication
• Report/Paper Numbers: WA-RD 145.1
• Contract Numbers: Y-3400, Task 1
• Files: TRIS, USDOT, STATEDOT
• Created Date: Apr 30 1988 12:00AM