MTS Triaxial Cell Models 656-06 - Manual (Page 24)

Introduction
About Series 656 Triaxial Cells
This manual documents the Model 656.04, Model 656.05, and Model 656.06 Triaxial Cells.
The Series 656 Triaxial Cells can be configured to perform compression, extension, and pore pressure
tests on geologic specimens.
These Triaxial Cells install in an MTS Series 315 Load Unit.
The Series 315 Load Unit applies high axial loads—up to 1000 kip (4600 kN) to the specimen.
About Pressure Intensifiers
The Pressure Intensifiers are designed to provide a source of fluid at pressures suitable for use in applying
pressure in a triaxial cell.
The Confining Pressure Intensifier is used to fill the triaxial cell with confining fluid, pressurize the fluid,
control the pressure, and empty the fluid from the triaxial cell at the conclusion of a test. An MTS Model
286.20 Confining Pressure Intensifier fills the Triaxial Cell with highly pressurized—up to 20,000 psi (140
MPa)—confining fluid. This fluid—usually a mineral oil—is applied to the entire specimen. We recommend
Multitherm
® PG-1, a highly refined, clear, and non-toxic mineral oil.
When pore pressure tests are run, the Pore Pressure Intensifier is used to fill the specimen’s pores with
pore fluid, pressurize the fluid, and control the pressure. An MTS Model 286.30 Pore Pressure Intensifier
applies fluid—usually water—to the ends of the specimen. This fluid is also highly pressurized—up to
20,000 psi (140 MPa).
Together the confining pressure, pore pressure, and Load Unit’s axial load simulate the forces experienced
by the specimen when it is underground. The name “Triaxial Cell” comes from this Cell’s ability to reproduce
these three forces, although the specimen’s stress state is not strictly triaxial.
For more information about pressure intensifiers, see the appropriate manual.
• Model 286.20 Confining Pressure Intensifier Product Information manual, part number 015-020-201
• Model 286.30 Pore Pressure Intensifier Product Information manual, part number 015-022-701
Description
The Triaxial Cell has two major parts—the platen assembly and the bell. The platen assembly attaches to
the Load Unit’s actuator. The bell closes on the platen assembly to seal the Triaxial Cell.
The lift cylinders raise and lower the bell. The bell up and bell down controls operate the lift cylinders.
Once up, the bell can be locked in place using the T-locks.
The bell lift control has two modes. UseSetup mode to raise and lift the bell, and Run mode during a test.
Pressing the Emergency Stop button immediately shuts off system hydraulic pressure.
24 | Triaxial Cell Product Information
Introduction