ShearTrac II

The ShearTrac II direct simple shear (DSS) system is used to measure undrained shear strength of soils to reflect the average shear strength mobilized in the field during failure of embankments on soft soil foundations and deep excavations in clay. The DSS test generates a fairly homogeneous state of shear stress throughout the specimen, which provides initial stress condition, stress path, and deformation configuration that models numerous field loading conditions more closely than any other test system.

The system design allows for easy interchanging between direct simple shear and direct/residual shear testing if desired. The vertical assembly can also be used to perform consolidation (incremental or CRC/CRS) or unconfined compressive strength tests.

Applicable Test Standards

• ASTM D2166, D2435, D3080, D4186, D4546, D6528
• AASHTO T 208, T 216, T 236
• BS 1377-5, 1377-7
• ISO/TS 17892-5, 17892-10
• AS 1289.6.6.1, 1289.6.2.2

Features

• Highly rigid mechanical design
• Large diameter loading piston with low friction support mechanism to eliminate rocking
• Consolidate with or without shear bias (or shear stress)
• Stress (load) or strain (displacement) control
• Tabletop design saves space
• Fully automated via computer or standalone capability for control and data collection
• Micro-stepper, electronic motor systems offer precise loading and shearing
• More accurate, reliable, and easier to maintain than units requiring hydraulics or air pressure
• Immediately produce reports according to test standards
• Front panel display and keypad for observation and control of the test
• Geo-Net compatibility allows access and control over a computer network
• System flexibility to optionally perform Direct/Residual Shear, 1-D Incremental Consolidation, Constant Rate-of-Strain (CRS) Consolidation, and Unconfined Compression testing

Specifications

• Accurate displacement rate control from 0.000006 to 33 mm/min (0.0000002 to 1.3 in/min)
• Vertical travel: 44.5 mm (1.75 in)
• Horizontal travel: +/- 25.4 mm (1.00 in)
• Dimensions: 660 x 406 x 813 mm (26 x 16 x 32 in)
• Weight: 66 kg (145 lbs)
• Test accessories, including Teflon® coated shear rings, available diameters: 50 mm (2.0 in), 63.5 mm (2.5 in), or 100 mm (4.0 in)