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

• ry

(Hsai-Yang Fang)

Major Components

• Elementary particles
• Particle systems
• Energy fields

In addition to this Environmental Phenomena (which pose difficulty in the current geotechnical philosophies & should be incorporated)

• Ion-Exchange reaction
• Adsorption
• Redox reaction
• Soil-bacterial interaction
• Mineralogical alteration

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) Neutral Charged (ions) Cations Mg+2, Na+

,

Anions Cl-, O-2 Simple ions Poly atom ions CO3

• 2,NO3
• , OH-

Sharing of a pair of electrons binds atoms together a new kind

• f particle  Molecule

Atoms Na, Mg, C, N, O, H CH4, NH3, HCl,

Particle Systems

Dry Soil Saturated soil Partially saturated Soil Single phase system Two phase system Three phase system Solid Liquid Gas 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

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

Types of Energy Fields

Mechanical Energy Field (K.E. and P.E.) Particles react differently in various energy fields Most widely used in Geotechnical Engg. Surface force & Body force (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