Product Details
 

 
   
AUTOTRIAX Automatic Triaxial Testing

Effective Stress Triaxial Tests
In geotechnical engineering, the triaxial test 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 loading/unloading, 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.

 

Main Features

 

• Full automatic control of the complete effective/stress path test
• Up to three independent triaxial tests can be controlled at the same time
• Cell pressure control up to 3000 kPa
• Real volume change measurement with remote control of change over valves
• Selection of different standard procedures
• Test control independent from P.C. and data logger

 

General Description

 

The Automatic Triaxial System will enable the full automation and control of all test parameters required to perform effective stress and stress path tests from start to finish.

The basic system comprises a real time control module housed in a chassis, a data logger and a computer running test and management software, all connected to a high speed communications and control network.

Commands sent from the test software are used by the real time control module, using the data logger for the transducer feedback, to control and manage the triaxial frame speed, the adjustment of pressure to the triaxial cell, the opening and closing of the pressure lines to the triaxial cell, and the automatic volume change device flow direction.

The software can manage all the transducer calibrations and triaxial system setup and channel allocation. The test software can run fully automated effective stress tests using different testing standards such as BS1377, ASTM and CEN.

The software will allow you to export test data or calibration data to supplied spreadsheet templates. The basic set up will allow the control of one effective stress or stress path test with the appropriate test software.

The system can be expanded to control up to three effective stress or stress path tests all managed from one computer.

In this type of system the test parameters (stress, volumetric and linear strains, pressure and suction) are continuously monitored and processed, in order to control and drive the different units (pressure and force controllers) to maintain the required stress/strain conditions set up at the beginning of the test.

The “brain” of these automatic systems is the Real Time Control Box (29-WF19001 to 19006 series) that has been designed to control and drive at the same time up to 3 automatic triaxial systems.
The main advantage of this solution is that the closed loop control of the different devices (pressure maintainers, compression frames, etc.) is carried out directly by the Control Box, continuously involved and dedicated to drive the systems on the basis of the pre-set test conditions, independently from the Datalogger and PC.

 

Order Information

 

An example of an automatic triaxial system is presented below*:
• One triaxial compression frame (28-WF4005 or 28-WF4010)
• Displacement transducer 30-WF6209
• One Tri-cell Plus triaxial cell (28-WF4070/P to 28-WF4150/P) equipped with:
- submersible load cell for axial force (30-WF6350 to 30-WF6356)
- pore pressure transducer 30-WF6301 and 30-WF6302
- volume change transducer (28-WF4412)
1. Two valve to close/open the drainage line (29-WF4515)
2. Electro-pneumatic servo-valve SERVOFLOW 29-WF4511 with bladder air/water pressure cylinder (28-WF4320) for pressures up to 1000 kPa, one HYDROMATIC servo-controlled hydraulic actuators (29-WF4502) for pressures up to 3000 kPa. Application and control of cell pressure
3. The real time control box base system RTC 29-WF4530
4. The 16 channels high speed ATD AUTOMATIC TRIAXIAL DATALOG
(29-WF4616 to 29-WF4632)

 

 

AUTOTRIAX - Automatic Triaxial System Configurations

 

EXPANDING FROM 1 TRIAXIAL UP TO 3 EFFECTIVE STRESS TRIAXIAL SYSTEMS FOR DIFFERENT LEVELS OF CELL AND BACK PRESSURE

The following tables are intended to provide a guide to items required for typical triaxial test system configurations.

Pneumatic System With Cell Pressure up to 1000 kPa and Back Pressure up to 1000 kPa

 

1 system

2 systems

3 systems

29-WF4530 RTC chassis and RTC module

1

1

1

29-WF4537 RTC module

-

1

2

29-WF4511 SERVOFLOW base system

1

2

3

29-WF4512 SERVOFLOW expansion

1

2

3

28-WF4320 Air/Water Bladder

2

4

6

28-WF4005 Tritech 50

1

2

3

29-WF4515 Two way Open and Close valve

2

4

6

29-WF4412 Automatic volume change

1

2

3

29-WF4616 ATD 16 channels

1

1

1

29-WF4616/UP1 16 channel expansion module

-

-

1

29-WF4616/S1 Effective stress software module

1

1

1

Hydraulic System With Cell Pressure up to 3000 kPa and Back Pressure up to 3000 kPa

 

1 system

2 systems

3 systems

29-WF4530 RTC chassis and RTC module

1

1

1

29-WF4537 RTC module

-

1

2

29-WF4502 HYDROMATIC

2

4

6

28-WF4005 Tritech 50

1

2

3

29-WF4515 Open and Close valve

2

4

6

29-WF4412 Automatic volume change device

1

2

3

29-WF4616 ATD 16 channels

1

1

1

29-WF4616/UP1 16 channel expansion module

-

-

1

29-WF4616/S1 Effective stress software module

1

1

1

Note: Back pressure will be limited to 2000kPa which is the maximum working pressure of the volume change device

Hydraulic / Pneumatic System With Cell Pressure up to 3000 kPa and Back Pressure up to 1000 kPa

 

1 system

2 systems

3 systems

29-WF4530 RTC chassis and RTC module

1

1

1

29-WF4537 RTC module

-

1

2

29-WF4502 HYDROMATIC

1

2

3

29-WF4511 SERVOFLOW base system

1

2

3

28-WF4320 Air/Water Bladder 1 2 3

1

2

3

28-WF4005 Tritech 50

1

2

3

29-WF4515 Open and Close valve

2

4

6

29-WF4412 Automatic volume change device

1

2

3

29-WF4616 ATD 16 channels

1

1

1

29-WF4616/UP1 16 channel expansion module

-

-

1

29-WF4616/S1 Effective stress software module

1

1

1

 

*Please consult for correct quotation with accessories

 

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AUTOTRIAX Automatic Triaxial Testing

 

     
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