Scope of Environmental Geomechanics Scope of Environmental - - PowerPoint PPT Presentation

Scope of Environmental Geomechanics Scope of Environmental Geomechanics

Protection of ground water aquifers from contamination (Containment) (Containment) Assessment of pollutants being discharged on/in the soil deposits (Disposal/Handling/storage) (Disposal/Handling/storage) Process by which the pollutants travel in geo- environment (Contaminant Transport) (Contaminant Transport) Methods of cleaning the contaminated sites (Remediation) (Remediation) Methods of creating “Value added” products (Recovery, Recycling & Reuse…..Three Rs) (Recovery, Recycling & Reuse…..Three Rs)

IIT Bombay Slide 16 Environmental Geomechanics Lecture No. 3 D N Singh

Precipitation

Landfill

Stationary W.T. Contaminant plume Leachate Hard rock (Impervious,Aquitard) Soil G.L.

Spread of Contaminant(s)

Containment /Barrier (Sheet pile/grout)

(Waste-Environment Interaction)

Environmental Geomechanics Lecture No. 3 D N Singh IIT Bombay Slide 17

Precipitation

Landfill

Moving W.T. plume Hard rock (Impervious,Aquitard) Extent (time & space) Intensity Concentration G.L.

Spread of Contaminant (another scenario)

Environmental Geomechanics Lecture No. 3 D N Singh

Soil

IIT Bombay Slide 18

Calls for: Modeling (to predict transport & fate of contaminants in geoenvironment) Validation

Importance of the following

• Theory (model making)
• Lab tests (data generation)
• Field tests (data generation/verification)
• Empirical relations (validation of the developed theory)
• Computer Applications (Role of Information Technology)
• Experience, Judgement and FOS

(Application of the acquired knowledge)

Slide 19 IIT Bombay Environmental Geomechanics Lecture No. 3 D N Singh

14.8.2013 Lecture No. 4 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. 4 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. 4 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. 4 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. 4 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. 4 D N Singh Slide 5

Soil Response to Environments

• Soil structures (on/in/with)
• Pore fluid characteristics
• Soil-heat
• Soil-Chemical
• Soil Bacteria
• Soil-Root
• Soil-Electrical
• Soil-Liquid (water)

IIT Bombay Environmental Geomechanics Lecture No. 4 D N Singh Slide 6