G3 – Environmental Geomechanics (Dr Sam Yuen)

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Presentation transcript:

G3 – Environmental Geomechanics (Dr Sam Yuen) 421-101 Introduction to Civil Engineering G3 – Environmental Geomechanics (Dr Sam Yuen)

Common Examples of Geotechnical Engineering Landslide and Ground Subsidence Earth Retaining Structures Land Reclamation Ground Improvement Foundations Excavation Dams Tunnels and Underground Space Mining Environmental Geomechanics

Geotechnical Engineering Ground Soil Groundwater Rock Natural Environment

Video – Introduction to Sanitary Landfill

Sources of Potential Pollutants from Landfills

(Highly polluted water) Sources of Pollutants Completed Landfill (Long-Term) Landfill Gas (CH4 & CO2) Waste landfill Gas Landfill Gas Leachate (Highly polluted water)

Landfill Design Concept

Natural Attenuation Landfills Low permeability stratum (e.g. heavy clay) Cover Waste Siting landfills in low permeability geological setting Attenuate contaminant migration through natural geological barriers

A Typical Containment Landfill Capping Waste Landfill Gas Extraction Well Liner Leachate Collection System

Liner Compacted clay Clay with admixtures ( e.g. bentonite, fly ash) Composite liners (using geosynthetics with clay layer)

Capping Design Compacted clay or composite layers (with geosynthetics) Top soil supports vegetation to prevent erosion Designed to tolerate settlement

Leachate Collection System Design Leakage rate through liner proportional to leachate head

Site Selection

Site Selection Environmental Impact Studies (EIS) Economic Social Environmental/ Engineering

Site Selection (continued ) Hydrogeological Assessment Site geology Permeability of geological material Structural discontinuity Groundwater hydraulic gradient Geological material attenuation capacities Surface water Water chemistry