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Introduction
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- The Torvane shear device (ELE International model 26-2261
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- , Figure
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- 1) enables the user to quickly determine the shear strength of cohesive soils.
Three sizes of vanes are supplied with torvane
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- :
- The standard vane, has a stress from 0 to 1 kg/cm2, this is also the approximate range of torque that can be easily applied by finger pressure.
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- It is used for fully saturated cohesive soils with undrained strength independent of normal pressure. The stress range permits it to be used for clays varying in consistency from very soft to stiff.
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- The large vane, is provided for use with remolded samples
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- . Has a ratio of 0.2.
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- The smaller vane
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- , has a ratio of 2.5. It is used with stiffer clays.
Figure 1.- Torvane shear device (ELE International)
- The pocket penetrometer was develop by Soiltest Inc. for use for field engineers to check the visual classification of soils. The readings of the penetrometer were compiled from several thousand unconfined compression tests of silty and clay-like soils.
Procedures - Measuring the Sample
Torvane
- Select the appropriate vane size and fit to vane driver (0.2, 1.0, 0.2 ratio)
0.22.51.0 
- Make sure zero on dial is aligned with index mark on knob, rotating a counter-clockwise the dial face
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