Particle-Energy-Field Theory Sub-topics Components of PEF theory - PowerPoint PPT Presentation

Particle-Energy-Field Theory Sub-topics • Components of PEF theory • Assumptions • Different Energy Fields • Applications • Studies by IIT Bombay Researchers

Par artic ticle le-Ene Energy-Field Field The heor ory (Hsai-Yang Fang) • Elementary particles Major Components • Particle systems • Energy fields In addition to this Environmental • Ion-Exchange reaction Phenomena • Adsorption (which pose difficulty • Redox reaction in the current geotechnical • Soil-bacterial interaction philosophies & should • Mineralogical alteration be incorporated)

Assumptions • Matter constitutes of: Atoms, Ions and Molecules • Particles may attract or repel each other & hence the following particle systems can be formed: Solid Liquid Gas • Importance of bonding energy (Ionic, covalent bonds, dipole interaction)

Elementary particles Element is composed of atoms (e, p, n) Cations Mg +2 , Na + Neutral , Charged (ions) Anions Cl - , O -2 Simple ions Atoms Na, Mg, C, N, O, H -2 ,NO 3 - , OH - Poly atom ions CO 3 Sharing of a pair of electrons binds atoms together a new kind of particle  Molecule CH 4 , NH 3 , HCl ,

Particle Systems Solid Liquid Gas Dry Soil Single phase system Saturated soil Two phase system Partially saturated Soil Three phase system Stress-strain relationship (Load-Deformation process) depends on the binding behavior of two or more particles Flow of water through the soil & water content Are dependent on the energies between particles

Phenomena of Solid-liquid-gas at interface Gas-gas Single phase interface Solid-solid Liquid-liquid Two phase interface Solid-liquid Solid-gas Gas-Liquid Multiphase interface Solid-liquid-gas

Types of Energy Fields Particles react differently in various energy fields Surface Mechanical Energy Field (K.E. and P.E.) force & Body force Most widely used in Geotechnical Engg. (Gravity) Loading of soil mass results in high density & low volume (combination of K.E., P.E., Thermal Energy (friction between particles), Sound & Light Energies----due to crushing of grains) Total Energy of the soil mass changes (i.e. change in orientation of soil particles) Compression of gases in voids, more dissolution of gases in pore solution elastic strains of soil grains, characteristics of double layer