Resonant Column/ Torsional Shear Testing System(TSH-100 & TSH-200)

This GCTS System combines the features of both resonant column and torsional shear devices into one system so that the effects of soil parameters such as void ratio, confining pressure, strain amplitude, and number of load cycles on shear modulus and material damping can be evaluated.

This GCTS System combines the features of both resonant column and torsional shear devices into one system so that the effects of soil parameters such as void ratio, confining pressure, strain amplitude, and number of load cycles on shear modulus and material damping can be evaluated. In fact, 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 up to 250 Hz while the bottom is fixed. Non-contacting rotational sensor and a torque transducer attached to the top platen monitor the torsional motion and torque directly. The non-contacting sensor is located on extended arms to amplify the rotational deformation providing a shear strain resolution of 10-6. An optional accelerometer can also be installed to measure large shear strains.

The GCTS System 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 allowing large vertical specimen deformations throughout the complete test. Its unique configuration also allows for very large shear deformations of up to ±20°.

Standard systems available for 71-mm and 100-mm diameter specimens available. Other platens sizes are also available.

 

Geotechnical Consulting & Test Systems (GCTS), USA

Geotechnical Consulting & Test Systems (GCTS), USA

Geotechnical Consulting and Testing Systems (GCTS) provides advanced testing solutions for Research in Geotechnical & Pavement materials. GCTS also helps in design of laboratory and in-situ testing apparatus and software ranging from modification and adaptation of existing apparatus to the purchase of new closed-loop computer-controlled systems. The company manufactures a full line of computer-controlled testing systems with either pneumatic or hydraulic loaders. Each system comes with a versatile software package which provides test control, data acquisition, data reduction, and graphing in one easy to learn Graphical User Interface.

 

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