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74_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

74_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - o...

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X15 Vane Shear Test (VST) Soundings o from Europe - measure undrained shear strength, Cu, of clays (ASTM 02573) (figure from Spangler and Handy, 1982) -- ...... \ J /1 I Shearing I surfaces I I I I I I I I I I I I I I \, --~--- ",/ ~r (a) (b) Principle of the vane shear test. (a) Shearing involves one vertical cylindrical surface and two horizontal end surfaces. (b) Twisting of the vane induces normal stress Un on the shearing surface. o Push
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Unformatted text preview: o Push vane into soil (possibly below bottom of borehole) and turn to measure torsional shear resistance. o Many different diameters, shapes, and lengths. o Primarily a soft clay tool - easily damaged. o Must be clean clay -sand does not fail as a cylinder because of bearing. o Miniature version sometimes used on samples and in lab....
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