Micro-level investigation of the in situ shear vane failure geometry in sensitive clay

作者：Gylland A S^*; Jostad H P; Nordal S; Emdal A

来源：Geotechnique, 2013, 63(14): 1264-1270.

DOI：10.1680/geot.13.P.011

• clays
• fabric/structure of soils
• failure
• in situ testing
• microscopy
• shear strength

The circumferential failure surface of a shear vane in strain softening soft sensitive clay is studied. A set of shear vane experiments are performed in situ, where the sheared region is retrieved from the ground using an over-coring technique. By producing thin sections, the circumferential failure zone is revealed when viewed under a polarised light microscope. The failure zone is found to first evolve after reaching the peak global resistance. Its shape is not a full cylinder, but rather a rounded square. The structure of the shear zone is non-smooth and characterised by complex shear patterns of micrometre size.

• 出版日期2013-11