A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Shear Strength of Sensitive Clay Slopes in Maine
This paper presents the case history of a natural slope, about 10 meters in height, in a sensitive, low plasticity, glaciomarine clay near Portland, Maine. The area in the vicinity of the slope has a history of landslides. A field and laboratory testing program was conducted which included field and laboratory vane shear (VST), CKoUC triaxial, and consolidation tests. Based upon regional geotechnical practice, the low undrained shear strengths measured behind the slope using the VST result in a stability factor of safety of 0.64 indicating failure for undrained conditions. However, the observed stable slope performance indicates that the actual factor of safety must be greater than unity. Regional geotechnical practice generally does not use corrections for measured su(FV) values in sensitive glaciomarine soils. Application of Bjerrum's anisotropic correction to the su(FV) measured at the site and considerations of stress history result in a computed factor of safety which is more consistent with the observed field performance of the slope. The application of VST anisotropic correction factors is recommended for future undrained stability analyses in this material.
Shear Strength of Sensitive Clay Slopes in Maine
This paper presents the case history of a natural slope, about 10 meters in height, in a sensitive, low plasticity, glaciomarine clay near Portland, Maine. The area in the vicinity of the slope has a history of landslides. A field and laboratory testing program was conducted which included field and laboratory vane shear (VST), CKoUC triaxial, and consolidation tests. Based upon regional geotechnical practice, the low undrained shear strengths measured behind the slope using the VST result in a stability factor of safety of 0.64 indicating failure for undrained conditions. However, the observed stable slope performance indicates that the actual factor of safety must be greater than unity. Regional geotechnical practice generally does not use corrections for measured su(FV) values in sensitive glaciomarine soils. Application of Bjerrum's anisotropic correction to the su(FV) measured at the site and considerations of stress history result in a computed factor of safety which is more consistent with the observed field performance of the slope. The application of VST anisotropic correction factors is recommended for future undrained stability analyses in this material.
Shear Strength of Sensitive Clay Slopes in Maine
Devin, Steven C. (author) / Sandford, Thomas C. (author)
Geo-Denver 2000 ; 2000 ; Denver, Colorado, United States
Slope Stability 2000 ; 114-128
2000-07-24
Conference paper
Electronic Resource
English
Shear tests , Slope stability , Stability , Slopes , Case studies , Maine , Clays , Field tests
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