Sample Size Effects Using the NGI Direct Simple Shear Apparatus.
Abstract
The contents of this report include a comparison of direct simple shear test results for variations in sample size and for two different soils. Soils tested were undisturbed samples of Gulf of Alaska and Gulf of Mexico clays. Testing was performed on the Norwegian Geotechnical Institute Direct Simple Shear Device and included both static and cyclic loading applications. The emphasis was on cyclic loading results. The parameters varied were sample cross section and sample height. Two cross-sectional sizes and three heights are compared. Test data included lateral strain measurements from which horizontal normal stresses and subsequently K sub o values were calculated. The calculations and results are discussed as affected by the sample size, with special attention to K sub o values. The main conclusions from this investigation were: K sub o is affected by changes in height; the smaller cross-sectional sample size produces higher static and cyclic shear strain resistance, but a much greater degree of scatter; and sample height had little obvious and consistent effects on cyclic shear results.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1979
- Accession Number
- ADA091460
Entities
People
- Michael D. Carroll
Organizations
- Air Force Institute of Technology