It is used for investigating the soil characters of shearing strength and deformation.
Set the thin ring specimen in each shearing ring at the upper and the lower.
Keeping the vertical stress load, fix the upper. Then, execute the rotary
shearing of the lower.
It can make extreme big deformation over the maximum shearing strengthbecause
of the rotary shering of the ring specimen.
Especially,it is very suitable to measure residual strength of
over consolidationclayfor thinking about"Big deformation in long termifor
example, landslide, etc.j"