Description

This apparatus consists of loading frame, saturation board and control system. In loading frame, vertical load (50 kN) applies to sample by servo hydraulic or electro servo mechanic system.
Cell pressure and back pressure at the top and bottom of the specimen are controlled by embedded regulators in saturation board & the magnitude of each one reads with the nearest 0.1 kPa by sensors. In undrained tests pore water pressure variation is measured and drained shear strength parameters can be determined.
In large scale triaxial in addition to loading 5 times more than ordinary apparatuses, it’s possible to make samples with 100 or 150 mm diameters and perform test on coarse-grained materials. Specimen displacement range is developed to 70 mm.
Control system is capable of applying vertical load (stress-control or strain-control) and All-around pressure (monotonic or cyclic). In apparatus software 4 successive phases can be defined that in each one deviator stress and All-around stress can be determined by user and the test results are shown as a graph during the test is performing. At the end, all readings are automatically saved as an Excel file. Result review of a specific test is not only possible in the excel software, but also in apparatus software.
Excluding regulators, all-around pressure can be controlled by mounted Servo pressure system on saturation board. Due to this, all stress paths can be performed in q-p. Also isotropic and anisotropic consolidation can be performed.
This apparatus can be promoted to wave velocity measurement and unsaturated tests system.