Volume 26, Issue 4 (December 2003)
Design and Performance of a 1m Diameter Ring Shear Apparatus
Constant Normal Stiffness (CNS) testing has evolved over the last 15 years in order to study the effects of soil deformations on the capacity of axially loaded piles. The majority of CNS testing in the laboratory has been carried out using modified shear box apparatus. However, results obtained from these apparatus may not accurately represent real behavior due to effects associated with the modifications to the shear box apparatus. The use of ring shear apparatus for CNS testing avoids many of the difficulties associated with modifying shear box apparatus. A large ring shear was constructed at the University of Sydney. This paper provides a description of the ring shear apparatus and some shakedown results to assess its performance.