Bishop Large Ring Shear System for Automatic Triaxial Testing Machine

The Bishop Ring Shear system is based on the concept introduced by Bishop in 1971.

In his type of Ring Shear apparatus, the ring-shaped soil specimen is enclosed inside a rigid set of discs (external and internal). The maximum height of the specimen can reach 20 mm, which makes it less sensitive to the presence of large particles in the soil while the friction developed against the confining rings can be measured. Shear stress is determined by a pair of load cells which provide accurate measurement of the loading pad’s resistance to rotation.

An adjustable gap is created between the upper and lower soil mass, on the sliding surface, to minimise the friction between the fixed upper portion of the annular specimen and the rotating lower part. Soil-soil and soil-steel interface tests can be conducted with the Bishop Ring Shear apparatus.

Tests are automated and easily conducted with Ring Shear software module, following the BS EN ISO 17892-10 standard.