IIT Gandhinagar  ajanta@iitgn.ac.in  ap@iitgn.ac.in
Soil Testing Lab

Introduction Experimental Setup Data Analysis Results Theory

Dynamic Triaxial Test

Need and Scope:

This test is also known as Cyclic Triaxial test. Determination of shear modulus (G) and damping ratio (D) of soils in either undisturbed or reconstituted states by using either load or displacement controlled cyclic triaxial system. This test is applicable to both fine grained and coarse grained soils. This test is also used to study the liquefaction analysis of silty, sandy soils.


Dynamic properties (G, D) of soil using cyclic triaxial system are obtained by following load application methods: i) Constant Load, ii) Constant Displacement. Constant load method requires the application of constant cyclic load (constant load amplitude); and constant displacement method needs the application of constant cyclic displacement. Cyclic triaxial test attempts to model these stress conditions by applying a pulsating deviator stress to the specimen while maintaining a constant confining stress on the specimen and preventing drainage (undrained conditions). The uniform sinusoidal deformation/load at a frequency range of 0.1 to 2 HZ is applied in constant displacement and constant load cyclic triaxial tests respectively.

Unsymmetrical compression-extension load peaks, non-uniformity of pulse duration, load fall-off at large strains must not exceed tolerances.

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