Constant Normal Stiffness Soil Test Equipment

A constant normal stiffness condition may be specified and maintained when testing specimens within GDS direct shear and direct simple shear apparatuses. This condition allows for both the normal stress and normal strain to vary as a specimen is sheared based on the contractive and dilative tendencies of the geo-material – here dilation results in increased normal stress and specimen height, while contraction results in decreased normal stress and specimen height. The magnitude of normal stress and normal strain variation is proportional to the constant normal stiffness value specified by the user, entered in units of kN/mm or kPa/mm. Practical applications of such a test condition include modelling the interface between piles socketed or grouted into a geo-material.

The following soil test equipment can perform the Constant Normal Stiffness soil test:-

Variable Direction Dynamic Cyclic Simple Shear
for constant normal stiffness soil test

GDS Shearbase System
for constant normal stiffness soil test

GDS Large Automated Direct Shear System (300mm)
for constant normal stiffness soil test

GDS Electro-Mechanical Dynamic Cyclic Simple Shear
for constant normal stiffness soil test

GDS Back Pressured Shear Box
for constant normal stiffness soil test

Dynamic Back Pressure Shearbox
for constant normal stiffness soil test