Sub-topics Soil-water-Environment Interaction The Natural - - PowerPoint PPT Presentation

03.8.2017 Lecture No. 5 Lecture Name: Soil-Water-Environment Interaction

Sub-topics

• Soil-water-Environment Interaction
• The Natural Environment
• The Man-made Environment
• Response of the soil to the Environment
• Basic Concepts: Analysis of Gemoechanical Engg.

Problems

• Flaws in Classical Geomechanics

IIT Bombay Slide 1 Environmental Geomechanics Lecture No. 5 D N Singh

Soil-Water-Environment Interaction

The Natural Environment Geomicrobiosphere Man Made Environment The Particle Energy Field Theory Environmental Geotechnical Problems Understanding of Soil response to Environments (Short & long-term) Requires knowledge from other Disciplines

(Bacteriology/Biology, Chemical Engg./Climatology/ Geohydrology/Geophysics/Geochemistry/ Hydrogeology/Mechanics/Microgeology/Physico

• Chemistry/SoilScience/Soil

Engineering/Toxicology)

IIT Bombay Environmental Geomechanics Lecture No. 5 D N Singh Slide 2

The Natural Environment

• Atmosphere (variable amount of vapour/dust)
• Biosphere (all plants & animal life)

Oxygen Cycle Nitrogen Cycle Carbon Cycle

• Hydrosphere (Water in oceans, rivers, lakes, aquifers, ice, clouds)
• Lithosphere (stone, rocks and soils)
• Geomicrobiosphere Ecosphere

(to study the characteristics of tree, vegetation, roots and bacterial activities in the soil and water and its overall response)

The Cycle of Nature

IIT Bombay Environmental Geomechanics Lecture No. 5 D N Singh Slide 3

The Cycle of Nature

Oxygen Cycle (O2 is found in combination with Si & Al)

Alumino silicates, Metallic oxides, Carbonates, Sulfates, Nitrates, Phosphates)

IIT Bombay Environmental Geomechanics Lecture No. 5 D N Singh Slide 4

Nitrogen Cycle (Transfer of Nitrogen between atmosphere, biosphere, lithosphere & hydrosphere in various forms)

Nitrogen fixation,

Carbon Cycle (oxidation of carbon containing material)

CO2 formation required for photosynthesis

Man-made Environment

• Agricultural wastes
• Human and Animal wastes
• Industrial wastes
• Mine wastes……Acid mine waste

(due to oxidation of Iron Sulphide (FeS2) or Pyrites to H2SO4)

• Nuclear wastes
• Construction Effects (Blasting/Dewatering/debris…)

Solid Liquid

IIT Bombay Environmental Geomechanics Lecture No. 5 D N Singh Slide 5