Ppt of Advances in Geotechnology
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Transcript of Ppt of Advances in Geotechnology
"...to design and construct public works..."
Civil Engineering
Practice of improving and maintaining the built and natural environment to enhance
the quality of life for present and the generations to follow
Transformation
Role of Civil Engineers
“Designers and Builders ofThe Quality of Life…….”
Creators of the Civilised Society EnvironmentProviding solutions to the needs of a developing global populationPerformers (on a world stage) as strategic thinkers and global managersPillars of local EconomiesCreating and maintaining complex infrastructure in wealth creation
Rock MechanicsRock Mechanics
FoundationsFoundations Retaining StructuresRetaining Structures Seepage/Slopes/DamsSeepage/Slopes/Dams
Soil MechanicsSoil Mechanics
GeomechanicsGeomechanics EnvironmentEnvironment
Geotechnical EngineeringGeotechnical Engineering
Challenge
Effect is morepronounced
GenesisPopulation ExplosionIndustrializationSluggish and “Don’t bother approach”IgnoranceHuman Greed
Is a Philosophy put in practice to deal with
under-ground “environment” & Problems associated with it
Combination/Blend of Geotechnical Engg. and Environmental Engg.
Average water table
Waste Disposal Strategies
Above ground storage
No protection Protected by geologic materials
wet periodaveragedry period
Backfill
Shallow trench burial
Engineered Backfill geological materials.
Deep Disposal
with backfill Protected by high-
retardation geologic material
Average water table
Backfill
Waste
Large boreholes 10 to 20 meters deep
Protective Geologic material
Backfillmaterial
Waste
deposits
Unfrcturedclayey
Issues areIssues are
Ascertaining the quality of air, water, and land resources; Transport, use, and disposal of hazardous wastes water and wastewater treatment, and reuse.
• Analysis and design of foundation systems, seepage control, earth dams and water resource structures, response of foundations and embankments to the ENVIRONMENTAL ACTIVITIES
Man made Natural earthquakes/(& to some extent other natural calamities).
industrialization/population explosion
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(Recycling & Reuse)(Recycling & Reuse)
Hazardous wastes Physical, Chemical, Mineralogical, Electrical and Thermal
characterization Geoenvironmental hazards:
Natural and man madeRecycle and Reuse of Industrial waste(s)
Role of Geotechnical engineering in environmental protection Surface and subsurface contamination Characterization of contaminated ground Geoenvironmental site investigation Site assessment technologies
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 DisciplinesBacteriology Biology Chemical Engg.Climatology Geohydrology Geophysics Geochemistry Hydrogeology Mechanics Microgeology Physico-Chemistry Soil Science Soil Engineering Toxicology
The Natural Environment
AtmosphereBiosphere
Oxygen CycleNitrogen CycleCarbon Cycle
HydrosphereLithosphere
Geomicrobiosphere Ecosphere
The Cycle of Nature
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
Soil Response to Environments
Soil structures (on/in/with)Pore fluid characteristicsSoil-heatSoil-ChemicalSoil BacteriaSoil-RootSoil-ElectricalSoil-Liquid (water)
Basic concepts of Analysis
Most geotechnical projects occur in nature
Long-term phenomenon
Soil is more sensitive and susceptible to environment than any other construction material
Loading may greatly affect soil properties but not the only Parameter to be considered
Think of other factors:
HeatMoisture (wet/Dry)Pollution intrusion
Classical Soil Mechanics: Some flaws
Specific gravity and Atterberg limits are constant
Void ratio and porosity as indicators of soil deformation
Water in the soil mass is mainly gravity water(need to consider Environmental water)
Flow through a soil mass is only due to hydrostatic potential(need to consider thermal/electrical/magnetic/chemical effects)
Constitutive models are arbitrarily chosen.
Stress-strain relationship
Soil Classification: Controlling Parameters
Grain-size distributionSoil Consistency (moisture content)LLPLPI
Present scenario
(Parameters)
Proposed scenario
(Parameters)
% Passing #200 SieveSpecific surfacepH in pore fluidIon-exchange capacityAbsorption & adsorptionThermal properties (Conductivity, diffusivity, specific heat)Dielectric constant (Electrical properties)
www.civil.iitb.ac.in/~dns
You are most welcome to Visit the laboratoryYou are most welcome to Visit the laboratory
There are 2 types of buildngs construction 1. Isolation Construction 2. Vibration Suspension Construction Isolation consruction includes
equipments to absrob seismic energy from foundation and prevent from shaking.
Vibration suspention utilizes suspention equipment such as damper in wall to absorb seismic energy and prevent from shaking.