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Title: Laboratory Investigations of Cohesionless Shear Strength in Low Confinement Environments
Authors: Winters, Katherine E.
Taylor, Oliver-Denzil S.
Berry, Woodman, W.
Cunningham, Amy L.
Rowland, Wesley R.
Antwine, Mark D.
Keywords: Laboratory testing
Low confinement
Soil fabric
Soil mechanics
Shear strength
Shear strength of soils-Testing
Sandy soils
Soil erosion
Soil mechanics
Publisher: Geotechnical and Structures Laboratory (U.S)
Series/Report no.: Technical Report (Geotechnical and Structures Laboratory (U.S));no.ERDC/GSL TR-18-22
Abstract: In low-confining stress environments, Mohr-Coulomb failure mechanics implies that a cohesionless soil has negligible shear strength. This report presents results of total stress laboratory investigations from triaxial and simple shear loadings for three loose- to medium dense, cohesionless materials, i.e., a poorly-graded sand (SP), a silty sand (SM), and a silt (ML), at confining pressures ranging from zero to 1000 kPa, as well as cyclic ring shear testing of the SP material at confining pressures from 10 to 100 kPa. All materials exhibited shear strengths and stress paths in excess of expected failure surfaces at confining pressures under 100 kPa. The data indicate that cohesionless soils exhibit significant soil fabric strength characteristics that are not captured by the standard internal friction angle definition, as evidenced by the shear stress intercept of the trendlines relating shear strength and confining pressure. Under low confinement, the continuum fabric dominates the angle of the Mohr envelope. The significant difference in the Mohr envelope shape illustrates that the internal fabric’s ability to resist different loading mechanisms cannot be assumed by a linear approximation.
Description: Technical Report
Gov't Doc #: ERDC/GSL TR-18-22
Rights: Approved for public release; distribution is unlimited
Size: 76 pages / 6.615Mb
Types of Materials: PDF/A
Appears in Collections:Technical Report

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