SAMPLE SIZE EFFECTS USING THE NGI (NORWEGIAN GEOTECHNICAL INSTITUTE) DIRECT SIMPLE SHEAR APPARATUS

To improve the use and the interpretation of results of the Norwegian Geotechnical Institute (NGI) direct simple shear device modified for cyclic loading, tests were conducted using undisturbed soil samples of Gulf of Alaska and Gulf of Mexico clays. The effects of variations in sample size are quantified. The parameters which varied were sample cross section and sample height. Two cross-sectional sizes and three heights were compared. Equipment used in the investigation, testing procedures, and soil characteristics are discussed. Test data include lateral strain measurements from which horizontal normal stresses and subsequently the initial lateral stress ratio values were calculated. These calcultions and results are discussed as affected by sample size, with special attention to the initial lateral stress ratio. Step-by-step instructions on the use of the use of the NGI direct simple shear device in both static and cyclic functions are explained. The use of the NGI sample trimming apparatus and methods for calibrating the NGI reinforced membrances using calibration cylinders are detailed.

• Corporate Authors:

  Rensselaer Polytechnic Institute

  Department of Civil and Environmental Engineering, 110 Eighth Street
  Troy, NY  United States  12180

  National Science Foundation

  Engineeing and Applied Science, 1800 G Street, NW
  Washington, DC  United States  20550
• Authors:
  • Carroll, M D
  • Zimmie, T F
• Publication Date: 1979-5

Media Info

• Pagination: 144 p.

Subject/Index Terms

• TRT Terms: Deformation curve; Measuring instruments; Properties of materials; Repeated loads; Shear strength; Shear tests; Soil mechanics; Soil tests; Soils; Statistical sampling
• Uncontrolled Terms: Sample size; Soil properties
• Old TRIS Terms: Shear apparatus
• Subject Areas: Data and Information Technology; Geotechnology; Highways; Materials; I41: General Soil Surveys;

Filing Info

• Accession Number: 00327111
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NSF/RA-790485
• Contract Numbers: NSF-PFR78-18743
• Files: TRIS
• Created Date: Feb 18 2002 12:00AM