The GCTS Hollow Cylinder Testing Systems are capable of performing advanced tests on large, hollow soil specimens, including liquefaction, plane strain, simple shear, dynamic shear strength, and shear modulus. These systems are able to simulate most field stress and strain paths and can perform both static and dynamic tests. By providing digital servo control of axial load, torque, confining pressure, internal pressure, and back pressure, the GCTS Hollow Cylinder Testing Systems are capable of subjecting the soil specimen to any stress state and follow any stress/strain path.
The included software automatically controls all five axes and calculates more than 20 HCA test parameters in real-time that can be used as control feedback to prescribe an infinite number of stress/strain paths. This includes the principal stress angle (α), allowing the system to easily prescribe the rate and magnitude of the σ1 rotation.
The system manages all the instrumentation and continuously monitors sensor outputs to accurately account for uplift pressures acting on the loading piston, area changes, deformation and volume change sensor setup, re-positioning, and more. It also advises the user on how to perform testing tasks and reminds the user of important steps in the test, which helps to minimize the learning time and ensure laboratory personnel can conduct tests with minimal error.