Automatic Triaxial Test Systems

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Description

AUTOTRIAX, THE BASIC AUTOMATIC TRIAXIAL SYSTEM EXPANDABLE IN SUBSEQUENT MODULAR STEPS FOR: Effective stress, Stress path, Permeability, Unsaturated soil tests.

TEST THAT CAN BE PERFORMED

Effective and Stress path Triaxial tests
The AUTOTRIAX Automatic triaxial system not only can perform Effective Stress triaxial tests with all the above vantages but is the unique and indispensable apparatus to perform the Stress Path test.

In fact this test is performed to allow the engineer to replicate the changes in stress conditions soil sample subjected to compression and extension both in the loading and unloading status. In few words, that soil, due for example to excavation, or construction or natural events, can produce the changes of magnitude of the principal stresses (major and minor). The test can only be accurately and reliably performed with a servo controlled closed loop system.

Permeability tests in triaxial cell
The permeability test can be automatically performed with the AUTOTRIAX system using the appropriate accessories.

Unsaturated soil testing
The unsaturated soil testing can be automatically performed with the AUTOTRIAX system using the appropriate accessories.

Note: More than 30 possible test configurations are available. For detailed information, including the complete list of equipment and related accessories see Automatic triaxial test systems: possible configurations.

Automatic Triaxial Test Systems Main Features

AUTOMAX: TO CONTROL UP TO THREE INDIPENDENT SYSTEMS, FEATURING:

  • The ability to run and control several triaxial tests automatically from a PC
  • The advantage of systems expansion in modular steps of components and software
  • The ability, due to the automatic control, to eliminate the negative environmental discrepancies as operator errors, non-calibration etc.
  • Performance of 24 hours 7 days tests without interruption and greater throughput of tests with a considerable cost decrease
  • The consequent achievement of a test regime that will produce reliable and repeatable results
  • The possibility to upgrade our or other make existing standard triaxial systems

Automatic Triaxial Test Systems Technical Specifications

The AUTOTRIAX system consists of a number of component, designed specifically for the test automation, which can combined for various up to three independent triaxial systems in different configuration (see Automatic triaxial test systems: possible configurations). Basic components are:

  • Triaxial compression frame (Triaxial load frames). A suitable machine is our model NG-WF4005, 50 kN cap. Or NG-WF4010, 100 kN cap.
  • Triaxial cell with vacuum top cap (Triaxial cells for advanced applications). A suitable models are our TriCell plus NG-WF4070/P to NG-WF4150/P equipped with vacuum top cap.
  • Control unit (Automatic triaxial test controller). The RTC, Real time control box NG-WF4530 with optional NG-WF4537 Expansion module, are the "brain" of the AUTOTRIAX. Provide the automatic control and drive of up to three triaxial systems.
  • Data acquisition unit (Data acquisition system for Automatic triaxial). The ATD, Automatic Triaxial Data log NG-WF4616 with optional NG-WF4616/UP1 Expansion module, provides the automatic data acquisition and broadcasts all transducers measurements on the high speed communication network to the RTC Real Time Control box.
  • Pressure systems (Pneumatic pressure controller or Hydraulic pressure controller), specifically: Servo flow, Electro-pneumatic servo-valve NG-WF4511 or NG-WF4513, for pressures up to 1000 kPa, or Hydromatic, servo-controlled hydraulic actuator NG-WF4502/A for pressures up to 3500 kPa.
  • Test software (Software modulus for Automatic triaxial system). They act as interface between the operator and the Autotriax system to manage automatically all test stages.

All the above components are fully described in the relevant sections named between brackets.

ats flow
Flow Diagram of the NG-AutoTriax System

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