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Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:力学进展

Volume:41

Issue:3

Page Number:351-371

ISSN No.:1000-0992

Abstract:A granular material is a conglomeration of discrete solid,macroscopic
   particles characterized by a loss of energy whenever the particles
   interact.Granular materials are omnipresent in nature,industrial
   practice and daily life,with size spanning from 1 mum to a few
   meters.The mechanical properties have long been studied.In recent two
   decades,many laboratory scale tests have been conducted and novel
   phenomena were observed.Both theoretical studies,such as granular matter
   statistical mechanics,granular solid hydrodynamics,and measurement
   techniques,such as X-ray CT,photoelastics,have witnessed great
   breakthrough.The revealed physical mechanism prompt ones to examine the
   assumptions,concepts,models and theories that previously proposed and
   being used.In this review paper,major fundamental problems are presented
   introduced and discussed,including the characteristics of microscale
   structure,procedure of micro-macro study with Rowe stress dilatancy
   relation as an example,derivation of stress and strain from microscale
   structure,the relation of macroscale strength with particle
   friction,size effect and similarity.In addition,granular soil as a
   typical granular material,its new developments are summarized.The
   frequently used techniques are introduced as well.Finally,we present a
   few aspects in which research should be reinforced,such as examining the
   assumptions in the discrete element method and checking the computing
   details,conducting the ideal physical and numerical experiments; by
   lying on the fast development of high performance computing,carrying on
   high scientific confidence degree large scale computation of granular
   materials with high scientific confidence degree; with the help of fast
   development of high performence computers.The mechanics of granular
   materials is still at its infancy stage,and there is a long way to
   directly solve the engineering problems.Essential development of related
   engineering technologies depends certainly on progress or break-through
   in the of fundamental studies of granular material mechanics.

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