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Automatic Triaxial Test Systems
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in geotechnical engineering, the automatic triaxial test systems is the laboratory test most commonly used to determinate the stress-strain relationship of a soil, in order to obtain reliable soil parameter information for a wide range of geotechnical problems and soil types. with the manual equipment the operator must follow a test step-by-step; adjusting the pressures via the adopted panels and regulators and opening and closing triaxial cell valves. to make the effective stress testing procedure much quicker and easier, a fully automated, computer controlled system is developed. stress path triaxial tests the laboratory triaxial stress path tests allow the engineering to replicate the changes in stress conditions experienced during excavations, constructions or natural events. specific stress conditions as compression and extension loadingunloading, k0 consolidation, can be recreated with this type of test. in the automatic systems, the different stages of effective stress and stress path triaxial tests are automatically set up and managed via closed loop servo-pneumatic or servo-hydraulic high technology devices.
Cyclic / Stress Path Triaxial System
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The Wikeham Farrance feedback controlled cyclic triaxial system applies cyclic or dynamic loading to the soil specimen. The system is a digitally controlled, servo pneumatic (closed loop) system, which controls three parameters: axial stress, confining pressure and back pressure. The base system incorporates an integrated Multi-Axis Control System (IMACS), a digitally controlled 5 kN actuator, Tritech 50 or Tritech 100 load frame, auxiliary air receiver complete with two servo valves for cell and back pressure control, two air filters and associated cables. The system is supplied complete with cyclic and stress path software. A double acting digitally controlled pneumatic actuator applies axial load. This cyclic load can be applied in load (N), stress (kPa), displacement (mm) or strain (%). Digitally controlled pneumatic valves apply confining and back pressures. The dynamic tests are generally carried out in conjunction with static imposed conditions of stress to the soil samples. The WF Static and Dynamic Cyclic Triaxial system has been designed to perform the following tests: • Standard triaxial tests (UU, CU, CD) including saturation, isotropic and anisotropic consolidation with pore pressure and volume change measurements
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