Permeability Triaxial System

VJ Tech’s Triaxial Permeability System can be used for the determination of the coefficient of permeability (also referred to as hydraulic conductivity) of fully saturated soils. Soil specimens are enclosed into a rubber membrane; thus, this is also called a flexible-wall permeability system. Normally, soils with a coefficient of permeability less than 10E-5 m/s can be tested using this method.

The system consists of a modified triaxial cell (Permeability Cell), which accommodates the soil specimens, and three hydraulic pressure controllers (APCH) for the application of the confining (Cell), Back, and Drain pressures. The hydraulic gradient is controlled by utilising the Back and Drain APCs. Procedures normally followed during effective stress triaxial tests are employed to fully saturate and isotropically consolidate the specimen prior to the permeability testing. Different combinations of effective stress and hydraulic gradients may be applied to a single specimen to determine the coefficient of permeability.

Using the csPermeability module and automatic solenoid valves, the testing procedure can be automated with the minimum human intervention. Raw data are collected by the software and all the relevant calculations and graphs are obtained. Results can be printed into standard reports while custom-made reports are also available upon request.

Effective stress triaxial systems can be upgraded into permeability systems with an additional hydraulic pressure controller. Moreover, contaminated samples can be tested using Stainless Steel Air-Water bladders.

  • Compact design (small footprint)
  • Utilises 3 x APCH to control Cell, Back and Drain pressures
  • Measurement of the Pore Water Pressure at the base of the specimen
  • Ability to perform saturation and isotropic consolidation
  • Hydraulic gradient is controlled by utilising the Back and Drain pressure APCs
  • Ability to determine the coefficient of permeability at different effective stresses, void ratios and hydraulic gradients
  • Automation option with the use of solenoid valves
  • Accurate determination of the inflow and outflow and automatic detection of steady-state conditions
  • Clisp studio module (csPermeability) for convenience and automated testing options
  • Built-in logger (in APCH) allowing high speed sensor data conversion (24 bit, up to 5000 samples/s) – No need for additional data logger
  • Standalone Use via Touchscreen display with data export to PC
  • Built-in live data table and graphs
  • Multiple Units can be controlled from single PC via a LAN or Ethernet/USB hub
Sample size (permeability cell)
50, 70 and 100 mm diameter
Maximum confining pressure
1000 kPa (higher pressures available via Triaxial Cells)
Minimum hydraulic gradient
1 kPa
Range of coefficient of permeability that can be determined
< 10E-5 m/s
Pore Water Pressure Transducer
1000 kPa
Software
Clisp Studio csPERMEABILITY
Test Performed

Permeability Testing

Standards
British
BS1377-7 : 1990
European
EN ISO 17892-11
American
ASTM D5084-16
Item
Description
Porous Stones

Variety of sizes available in Bauxite stone or Sintered Metal for improved durability during high loads

Filter Paper

Available in a variety of sizes

Rubber membranes

Available in a variety of diameters & heights. Nominal thickness is 0.4mm as standard.

De-aired water system

De-aired water tank (19 litre capacity) availability in hard anodised finish, or stainless steel for better durability. Vacuum pump is required; sold separately.

APC Water & Air Distribution Panel

Assists users fill/empty their Pressure Controllers, Triaxial Cells and other pressure chambers. A variety of sizes panels are available to connect multiple devices. Can be supplied with or without a mechanical pressure gauge; which can act as an independent reference point.

Upgrade Options *
Contaminated Samples Testing
*Upgrade options will require additional hardware. Contact us for more information.
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