triaxial test

triaxial test

A test subjecting a specimen to lateral and axial loads simultaneously.
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Based on the triaxial test results on gravelly material, the confining pressure, loading frequency and shear strain are considered as the most important parameters that affect the shear modulus and damping ratio.
The employed dynamic triaxial test used a computer-controlled electro-hydraulic servo dynamic triaxial test system (SDT-10), as shown in Figure 1.
According to mechanical tests, the shear strength of the triaxial test is bigger than the direct shear test.
Based on this model, Chang and Hicher [30] simulated the conventional triaxial test of Hostun sand under drained and undrained conditions.
Furthermore, the friction angle ([PHI]'c) and cohesion (c) were obtained using also the drained-consolidated triaxial test.
The most common indirect methods are graphical methods using tensile and compressive strength data fitting of linear failure criteria on laboratory triaxial tests data and fitting of non-linear failure criteria on laboratory triaxial test data.
Further mechanical considerations include one-dimensional compression and consolidation, the triaxial test and anisotropic shear susceptibility, and soil settlement and elasticity.
3] are material coefficients from multiple regression analyses of the repeated load triaxial test data.
The triaxial test is a method for determination of shear strength of all types of soils under different drainage conditions, in this method cylindrical specimen submitted to the stress from all directions, this is subjected to confined pressure from the sides and also from the top gradually axial force applied up to shear failure of specimen.
The unconfined compression test (UCS) as special case of the unconsolidated undrained triaxial test (UU) as defined as the load per unit area at which an unconfined prismatic or cylindrical specimen of standard dimensions of a soil fails in a simple compression where the confirming pressure is zero.
There are three kinds of approaches on studying dynamic properties of coarse granular soils in laboratory: (1) test wave velocity and attenuation properties based on wave theory (ultrasonic and pulse technique); (2) test soil coefficients of stiffness and damping based on vibrate theory (resonant column triaxial test); (3) obtain the relationship of stress-strain directly based on cyclic loading tests such as cyclic triaxial test, hollow torsional test, simple shear test, torsinal simple shear test etc.