Large Cyclic Direct Simple Shear (Cyclic DSS)

Large Cyclic Direct Simple Shear (Cyclic DSS) Load Frame / Test System

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The ShearTrac III-DSS system is a universal shear system capable of performing the consolidation, static and cyclic direct simple shear phases under full automatic control. This system is of the type developed at NGI in the mid 1960's. 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 strength tests such as triaxial. The system consists of a computer-controlled unit that utilizes micro-stepper motors to apply the vertical and horizontal loads to the soil specimen.

Applicable Test Standards

  • ASTM D 6528 Consolidated Undrained Direct Simple Shear Testing of Cohesive Soils
  • ASTM D2435/T216 One-Dimensional Consolidation Properties of Soils


  • Choose load capacity to fit user needs up to 45 kN (10,000 lbs.)
  • Total automation of data collection and reporting of test results
  • Prepare tables and plots of report quality within minutes of completing a test
  • Generate columns of data for easy reduction using your own spreadsheet software
  • Ability to access and control the unit over a computer network using Geo-Net option
  • Accurate displacement rate control from 0.00003 to 15 mm per minute (0.000001 to 0.6 in. per minute)
  • Select number of data points logged per cycle form 10 to 500 readings per second
  • Stand alone through front keypad and LCD menu capability
  • Versatile system
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