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Stress-strain characteristics of cohesionless granular materials subjected to statically applied homogenous loads in an open system

Citation

Bell, James Melvin (1965) Stress-strain characteristics of cohesionless granular materials subjected to statically applied homogenous loads in an open system. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-03242003-102726

Abstract

A general stress-strain relationship in incremental and invariant form is derived for sand on the basis of experimental evidence. The resulting expression does not include the yield condition but makes allowance for the direction of loading and the state of stress. Two new modified and dimensionless invariant functions are introduced and a detailed description and classification of stress paths presented. A new first yield criterion for sand stressed to yield along one stress path is developed from experimental evidence. The friction angle in triaxial compression was minimum and 14[degrees] less than that in triaxial extension. The Mohr-Coulomb yield criterion extended to three dimensions is rejected. Emphasis is placed on the importance of obtaining homogeneous stress in physical experiments. A new spherical compression apparatus was developed to study the behavior of sand under spherical compression. Disadvantages of former apparatuses were largely overcome by elimination of frictional loading, and a homogeneous state of stress was obtained. A new stress controlled three-dimensional compression apparatus capable of applying principal stresses to a rectangular, plate sample was developed to study the behavior of sand under a general stress state, particularly under deviatoric stress. This apparatus provided for the independent measurement of volumetric strain and allowed for the development of considerable deformation in obtaining yield.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Engineering
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Engineering and Applied Science
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Scott, Ronald F.
Thesis Committee:
  • Scott, Ronald F. (chair)
  • Housner, George W.
  • McCormick, Caleb W.
  • Brooks, Norman H.
  • Knowles, James K.
Defense Date:1 September 1964
Record Number:CaltechETD:etd-03242003-102726
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-03242003-102726
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1084
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:24 Mar 2003
Last Modified:26 Dec 2012 02:35

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