SOIL TRIAXIAL TEST

STANDARDS: BS 1377:7, 8 / ASTM D2850, D4767 / CEN-ISO/TS 17892-8, 9 / NF P94 070, P94 074

Introduction 

To design foundations, embankments and other soil structures, Geotechnical Engineers require methods of assess­ing the mechanical properties of soils. For over 60 years Wykeam Farrance, now incorporated in the CONTROLS Group, has been at the forefront of the development of test systems designed to give engineers the infor­mation they require.  

Since the development of the first com­mercially produced shear box machine in the 1950s, we have been working closely with leading Academics and Universities to produce testing sys­tems that further advance the under­standing of soil mechanics. 

The experimental investigation used to determine the stress-strain rela­tion is usually carried out with triaxial tests, where undisturbed soil specimen are subjected to different stress levels and drainage conditions to simulate as close as possible the different situ­ations that can occur in the subsoil on site because of the effect of building constructions, excavations, tunnelling, etc. 

Our geotechnical division manufac­tures a large sophisticated state of the art range of triaxial equipment, which is detailed above. 

Testing systems should include the following main modules  

A - TRIAXIAL LOAD FRAMES 

STANDARDS: BS 1377:8 / ASTM D2850, D4767 / CEN-1SO/TS17892-8, 9 / NF P94 070, P94 074 

28-WF4005 Tritechtriaxial load frame 50 kN cap.

110-240 V, 50-60 Hz, 1 ph.

28-WF4010 Tritechtriaxial load frame 100 kN cap.

110-240 V, 50-60 Hz, 1 ph.

Main features  

• RS 232 control interface
• Digital control
• Speed range 0.00001 to 9.99999 mm per minute
• Rapid approach facility
• Audible alarm at limit of travel
• LCD 4-row by 20 character display
• All steel construction, stainless steel platen
• The quality of the design has eliminated all vibrations that can affect the specimen under test

Technical specifications  

B - LOAD AND DISPLACEMENT MEASUREMENT

Strain gauge load cells 

Used to measure the axial force applied to the specimen in the triaxial cells:

General specifications 

• Nominal sensitivity                  : 2mV/V
• Accuracy                                 : better than 0.1%

Note. All the load cells are supplied complete for connection to the upper beam of the triaxial frames (all models)

Potentiometric displacement transducers and mounting brackets  

• Input voltage                            : 10 V DC
• Output                                     : from 0 to 10 V DC
• Repeatability                           : better than 0,002 mm
• Accuracy                                 : better than 0,002 mm

30-WF6208 Axial displacement potentiometric transducer, 25 mm travel

30-WF6209 Axial displacement potentiometric transducer, 50 mm travel

30-WF6210 Axial displacement potentiometric transducer, 100 mm travel

30-WF6220 Mounting bracket for 28-WF4050 triaxial cell, 15.5 mm dia. ram

30-WF6221 Mounting bracket for  28-WF4070, 28-WF4100, 28-WF4150, 28-WF4070/P, 28-WF4100/P, 28-WF4150/P triaxial cells, 25 mm dia. ram

30-WF1048/T Mounting bracket for 28-WF0410/A, 28-WF0411/A, 28-WF0416/A

 C - TRIAXIAL CELL (Banded triaxial cells for specimens upto 150 mmdia.)  

C.1 - BANDED TRIAXIAL CELL ACCESSORIES