Description and Specification for Lab Tenders
Triaxial Test Apparatus.
Specification: Consolidated Undrained (CU) Test & Consolidated Drained (CD) Test
Peak effective strength parameters (c' and f') may be determined either
from the results of consolidated undrained (CU) triaxial compression
tests with pore pressure measurement, or from consolidated drained (CD)
triaxial compression tests. The consolidated undrained/ drained triaxial
compression tests are normally performed in several stages, involving
the successive saturation, consolidation and shearing of each of three
specimens.
Saturation is carried out in order to ensure that the pore fluid in the
specimen does not contain free air. Saturation is normally carried out
by leaving the specimens to swell against an elevated back pressure.
Back pressure (which is simply an imposed pore pressure) is applied
through a volume change gauge to the top of the specimen, while a cell
pressure of slightly higher value is also applied. Both cell pressure
and back pressure are normally increased in increments, allowing time
for equalization at each stage. The degree of saturation can be
expressed in terms of Skempton's pore pressure parameter.
Consolidated Undrained (CU) Test:
Once consolidation is complete, the specimen is to be isolated from the
back pressure and the rate of vertical movement of the compression
machine platen set according to result of consolidation.. During the
shear stage the vertical stress is increased by the loading ram, and
measurements are made at regular intervals of deformation, ram load and
pore pressure. These are converted to graphs of principal stress
difference (s1- s3) and pore pressure as a function of strain, and
failure is normally taken as the point of maximum principal stress
difference. The effective stress Mohr circles are plotted for the
failure conditions of the three specimens which has been subjected to
different consolidation level, and the gradient and intercept of a
straight line drawn tangential to these circles defines the effective
strength parameters c' and f'.
Consolidated Drained (CD) Test:
The consolidated drained triaxial compression test, with volume change
measurement during shear is carried out in a similar sequence to the
consolidated undrained test, but during shear the back pressure remains
connected to the specimen which is loaded sufficiently slowly to avoid
the development of excess pore pressures. The shear stage of a drained
triaxial test can be expected to take between 7 and 15 times longer than
that of an undrained test with pore pressure measurement. Once shearing
is complete, the results are presented as graphs of principal stress
difference and volume change as a function of strain, and the failure
Mohr circles are plotted to give the drained failure envelope defined by
the parameters cd' and fd' .Triaxial CD-CU-UU equipment is computer
controlled, test values can be transferred to computer and data
processing can be made with Triaxial software on Windows operating
system. All data can be used on Excel programs. The load data and axial
displacement data are transfered and recorded through the software.
Three pressure data (cell pressure, back pressure and pore pressure)
from triaxial cell and volume change data transfered and recorded
through the unilogger to the software.
Multiplex Universal Electromechanic Test Machine
The Multiplex Universal Electromechanic Test Machine is a Servo
Controlled Multiplex Machine supplied complete with 50 kN Load Cell, 25
mm Linear Potentiometric Transducer and Data Acquisition and Control
Unit. 5 kN Loadcell should be ordered separately for Triaxial Tests.
The Frame capacity is 50 kN. This versatile digital loading frame
features a microprocessor controlled drive system with an advanced servo
motor enabling the operator to easily set any test speed via the
membrane keyboard. The keyboard comprises adjustment buttons such as
“start”, “increase”, “automatic”, “manual”, “down”, “up”. The testing
speed can be set between 0,00001 mm/min to 51mm/min. The test
automatically stops when load and displacement is reached to 99% value
of the set measuring range. See page 243 to 245 for details.
Load and displacement values are collected by Software and transferred
to PC for further processing with the UU and CU-CD Software.