The Effective Stress Mechanics of Undrained Shear Strength

Abstract

On the basis of theory and available experimental data, the influence of stress system (i.e., anisotropy, pore pressure response, rotation of principal planes and the intermediate principal stress) on the undrained shear strength of saturated clay, in terms of effective stress is explained. The developed theory to explain the influence of stress system on the results of model footing test conducted under Project MODIAP at the Massachusetts Institute of Technology is used. The concept of a three-dimensional strength surface is developed to explain the variation of shear strength, in terms of effective stress, in a cross-anisotropic clay. The concept of a three-dimensional pore pressure response surface is developed to explain the variation of pore pressure response in a cross-anisotropic clay. It is then shown that the intersection of these two surfaces defines the variation of undrained shear strength with the orientation of the principal stresses at failure.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1971
Accession Number
AD0887071

Entities

People

  • Douglas H. Merkle

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Civil Engineering
  • Construction
  • Crystal Structure
  • Elastic Properties
  • Failure Mode And Effect Analysis
  • Geometry
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Properties
  • Pressure Measurement
  • Stress Strain Relations
  • Stresses
  • Test And Evaluation
  • Three Dimensional
  • Two Dimensional

Readers

  • Geotechnical Engineering.
  • Structural Health Monitoring of Composite Structures.
  • Theoretical Analysis.