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6506-12 - Rationale of the Triaxial Method(1 Stresses at...

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1 TRIAXIAL METHOD OF MIX DESIGN by V.R. Smith Rationale of the Triaxial Method (1) Stresses at failure are a function of confining pressure Failure envelope is defined by Cohesion and φ Plots of Mohr Circles at Failure (2) Plots of Maximum Shear and Normal Stresses due to a Uniform Circular Vertical Load (3) Failure will occur if the combinations of shear stresses and normal stresses fall outside of the failure envelope for the pavement material. (4) For a given combination of shear and normal stresses, the required cohesion ( C ) and friction angle ( φ ) for the material such that the material would not fail can be determined. (See next figure) Determination of the Required C and φ to Prevent Failure for a Combination of Shear and Normal Stresses (5) Plots of the Required C for Different φ values to Prevent Failure under a Uniform Vertical Load of Radius of R and Pressure of P The critical condition occurs at the surface.
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