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Triaxial Load Frames

Triaxial Load Frames are used to determine shear strength tests, (stress-strain relationships) performed in geotechnical testing labs. Popular tests include ASTM D2850 and AASHTO T 296 unconsolidated-undrained (UU), ASTM rods allow quick adjustments of the horizontal crosshead height. All units run on 3/4hp DC motors.

Soil specimens for triaxial tests are mounted in test cells which will be pressurized using fluid to replicate confining pressures typically found in the field. The triaxial test cells are placed in a load frame where loads will be applied axially to determine the stress-strain relationships which ultimately provide information about the samples shear resistance, strength, and cohesion. These values are critical in the prediction of slope stability and structural foundation behavior.

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Load Frame, 0.001—0.1in/min, 10,000lbf
Models: HM-396, HM-396F
Load Frame, 0.0001—0.3in/min, 10,000lbf
Models: HM-397, HM-397F
Load Frame, 0.00001—0.29999in/min, 20,000lbf
Models: HM-399, HM-399F
Load Frame, 0.02—2.0in/min, 10,000lbf
Models: HM-398, HM-398F
Triaxial Load Frame

Load Frame Comparison Table

Click the Comparison Table above to enlarge, print, or download. The table indicates force capacity and strain rate for common geotechnical testing applications.

Models have a load capacity of either 10,000 or 20,000lbf (44.5 or 89kN) with various strain rate options, controllers regulate strain rates to ±1% of set point. These heavy-duty units have a sturdy 14-gauge painted steel enclosure with an 11.9x37.3in (302x947mm) WxH frame opening and 8in (203mm) platen diameter. Adjustable nuts on 1.25in (32mm) diameter coarse-threaded rods allow quick adjustments of the horizontal crosshead height. All units run on 3/4hp DC motors.

Digital and analog components are required to measure applied load and sample deformation. Components are high-quality instruments that are user friendly and easily attach to the load frames for accurate and reliable triaxial shear strength testing. Data Acquisition Software is available for automatic recordings of axial load and deformation data of UU, CU, CD, or unconfined soil samples. Pore pressure values can also be recorded or manually entered with a Pore Pressure Transducer and Digital Readout.

  • HM-396 model has a strain rate of 0.001—0.1in/min, a total load capacity of 10,000lbf with a high-speed platen advance that rapidly positions the platen for faster set-up.
  • HM-397 model has a strain rate of 0.0001—0.3in/min, a total load capacity of 10,000lbf with a micro-stepping drive controller that allows more precise control of loading rates.
  • HM-397B model has a precision strain rate of 0.00001—0.29999in/min allowing for testing of sensitive soils and a total load capacity of 10,000lbf. The micro-stepping motor and drive controller precisely control load rates.
  • HM-399 model has an enhanced strain rate of 0.00001—0.29999in/min for sensitivity and a total load capacity of 20,000lbf, which makes this load frame the best choice when testing ASTM D4767 consolidated/undrained triaxial tests.
  • HM-398 model has a strain rate of 0.02-2.0in/min, a total load capacity of 10,000lbf allows use for a wider range of soils, and asphalt test methods.