Resonant Column and Torsional Shear Testing Machine for Soils
TSH-100/200 Resonant Column/ Torsional Shear Testing System

The GCTS TSH-100/200 Resonant Column/Torsional Shear Testing System combines the features of both resonant column and torsional shear devices into one system in order to accurately evaluate the dynamic soil parameters.  With this system, various tests under differing conditions can be executed.


  • Capable of performing modulus damping resonant column and torsional tests on soils and asphalts (both solid and hollow specimens)
  • Easy-to-use software to automatically perform resonant column & torsional shear tests
  • Floating drive and measurement system to allow for large angular & axial specimen deformations
  • 1,000 kPa (150 psi) maximum confining pressure. Larger capacities available upon request using a metallic cell wall
  • Platens with ultrasonic transducers for P- and S-wave velocity measurements are also available
  • Available loading frame to perform test at anisotropic stress conditions in addition to conventional static and dynamic tests


The Resonant Colum/Torsional Shear Testing System (TSH-100/200) combines the features of both resonant column and torsional shear devices into one elegant system, enabling it to evaluate the effects of a number of soil parameters, such as void ratio, confining pressure, strain amplitude, number of load cycles on shear modulus and material damping. By utilizing all available options, this system is capable of the full spectrum of modulus measurement, ranging from ultra-low strains to high strains with significant overlap.


For the resonant column test, a torsional drive is used to vibrate the top of the soil specimen at first-mode resonance at frequencies of up to 500 Hz while the bottom is fixed. A non-contacting rotational transducer is attached to the top platen monitor the torsional motion directly. The non-contacting sensor is located on extended arms to amplify the rotational deformation and provides a shear strain resolution of 10-6. An optional accelerometer can also be installed to measure large shear strains.


The TSH-100/200 can also perform closed-loop torsional shear tests (stress or strain controlled) on the same soil specimen, either statically or dynamically, at up to 50 Hz.


With this system, soil specimens can be tested under isotropic (hydrostatic) or anisotropic conditions. The driving and measuring system are mounted on a "floating" frame, which allows large vertical specimen deformations throughout the complete test. Its unique configuration also allows for very large shear deformations of up to ±20°.


Standard systems are available for 71 mm and 100 mm diameter specimens. Hollow cylinder platens, molds, and preparation equipment are also available.

  • 2.33 N-m torsional load capacity
  • 250 Hz maximum rotational frequency
  • ±25° maximum rotational stroke
  • 100 mm maximum specimen diameter


Please contact GCTS for full specifications.