What is Deviatoric stress in soil?

What is Deviatoric stress in soil?

Deviatoric stress is the difference between the stress tensor σ and hydrostatic pressure tensor p acting on the rock or soil mass.

What is consolidated drained test?

Consolidated drained (CD) In a ‘consolidated drained’ test the sample is consolidated and sheared in compression slowly to allow pore pressures built up by the shearing to dissipate. The rate of axial deformation is kept constant, i.e., strain is controlled.

What is tri axial compression test?

Introduction. Triaxial tests are widely used in geotechnical engineering both in soil and rock mechanics. Specimens are axially loaded to failure while a confining pressure is constantly applied. The confining pressure is determined and remains constant during a test.

What is shear strain in soil?

Shear strength is a term used in soil mechanics to describe the magnitude of the shear stress that a soil can sustain. The stress-strain relationship levels off when the material stops expanding or contracting, and when interparticle bonds are broken.

What is triaxial test of soil?

A triaxial test is performed on a cylindrical core soil or rock sample to determine its shear strength. The triaxial test attempts to replicate the in-situ stresses (stresses in the original place the soil sample was taken) on the core soil or rock sample.

Is Clay drained or undrained?

Clay behavior depends on the rate of loading (or unloading). When “fast” stress changes take place then clay behavior is typically modeled as “Undrained” while slow stress changes or long term conditions are typically modeled as “Drained”. In the software, the default behavior of a clay type soil is set as “Undrained”.

Why unconsolidated drained test is not possible?

The unconsolidated-drained test is meaningless because the shear strength test can be performed only after consolidation takes place. Water cannot be drained from an unconsolidated soil mass. So, UU test is meaningless.

Which are the stages of triaxial compression test?

We know that there are two stages of loading in triaxial compression test – (a) Consolidation, during which cell pressure is applied and (b) shearing, during which deviator stress is applied.

What is the formula of shear strain?

shear strain=ΔxL0. shear stress=F∥A. shear stress = F ∥ A . The shear modulus is the proportionality constant in (Figure) and is defined by the ratio of stress to strain.

What is effective soil pressure?

(i) The effective stress is equal to the total stress minus the pore pressure for a saturated soil. σ = σ – u. (ii) The effective stress controls certain aspects of soil behaviour like strength, deformation etc.