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Paper Information

Journal:   INTERNATIONAL JOURNAL OF ENGINEERING   DECEMBER 2003 , Volume 16 , Number 4 (TRANSACTIONS B: APPLICATIONS); Page(s) 311 To 327.
 
Paper: 

A MULTI-PLANE MODEL FOR NATURAL ANISOTROPY OF SAND

 
 
Author(s):  SADRNEZHAD S.A.A.D.*
 
* TEHRAN, IRAN
 
Abstract: 
Anisotropy of sand is mainly due to the geometrical arrangement of particles that ‎depends on the orientation of applied load respect to the bedding plane. It is ‎geologically due to micro-fabric created by the arrangement of the particles ‎configured during deposition. Most of the models developed using stress/strain ‎invariants are not capable of identifying this kind of anisotropy. This is mainly ‎because stress/strain invariants are quantities not capable of carrying directional ‎information with them selves. The main objective of this paper is to outline a ‎methodology for modeling the elastic-plastic behavior of an inherently anisotropy ‎arising form certain kind of plane of deposition. The constitutive equations of the ‎model are derived within the context of elastic behavior of the whole medium and ‎plastic sliding of interfaces of predefined multi-planes, following the framework of ‎working with six stress/strain components and not missing the directional effects. The ‎formulation incorporates explicitly the notion of the preferred direction, which defines ‎the orientation of the material fabric. The proposed multi-plane based model is ‎capable of predicting the behavior of soils on the basis of plastic sliding mechanisms, ‎elastic behavior of particles and possibilities to see the micro-fabric effects as natural ‎anisotropy as well as induced anisotropy in plasticity. The model is capable of ‎predicting the behavior of soil under different orientation of bedding plane, history of ‎strain progression during the application of any stress/strain paths. The influences of ‎rotation of the direction of principal stress and strain axes and induced anisotropy are ‎included in a rational way without any additional hypotheses. The spatial strength ‎distribution at a location as an approximation of probable mobilized sliding ‎mechanism is proposed as a ellipsoid function built up on bedding plane‏.‏
 
Keyword(s): MULTI-PLANE, ELASTIC-PLASTIC, MODEL, ANISOTROPY, BEDDING PLANE
 
References: 
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