Learning Objectives
5 objectives- Understand fundamental soil properties, classification systems, and phase relationships governing soil behavior.
- Analyze stress-strain behavior and shear strength parameters of soils using theoretical and empirical methods.
- Apply concepts of consolidation, settlement, and slope stability to predict and mitigate geotechnical risks.
- Design earth retaining structures and deep foundations considering soil-structure interaction and stability requirements.
- Evaluate and apply ground improvement techniques, geosynthetics, and seismic considerations in geotechnical engineering projects.
Content Outline
PreviewUnit 2191: Comprehensive Geotechnical Engineering
1. Soil Mechanics Fundamentals
- Introduction to Soil Properties
- Physical properties: texture, structure, density, moisture content
- Chemical and mineralogical composition
- Soil Classification Systems
- Unified Soil Classification System (USCS)
- AASHTO classification
- Phase Relationships in Soils
- Soil phases: solids, water, air
- Soil phase diagrams and indices (void ratio, porosity, degree of saturation)
- Fundamental Principles Governing Soil Behavior
- Effective stress principle
- Permeability and seepage
- Compressibility and volume change behavior
2. Stress-Strain Behavior of Soils
- Stress Distribution in Soils
- Types of stresses: total, effective, pore water pressure
- Boussinesq and Westergaard stress distribution theories
- Soil Strength Parameters
- Cohesion, angle of internal friction
- Apparent cohesion and effective stress parameters
- Interpretation of Stress-Strain Curves
- Elastic and plastic deformation
- Modulus of elasticity and Poisson's ratio
- Stress-strain behavior for different soil types
3. Shear Strength of Soils
- Mohr-Coulomb Failure Criterion
- Shear strength envelope
- Parameters: cohesion (c), friction angle (φ)
- Factors Influencing Shear Strength
- Soil type, moisture content, density
- Stress history and anisotropy
- Measurement and Calculation Methods
- Laboratory tests: direct shear, triaxial compression, unconfined compression
- Field tests: vane shear, shear wave velocity
4. Consolidation and Settlement Analysis
- Theory of Consolidation
- Terzaghi’s one-dimensional consolidation theory
- Coefficient of consolidation and permeability
- Settlement Analysis
- Immediate (elastic) settlement
- Primary consolidation settlement
- Secondary compression
- Prediction Methods
- Computation of settlement magnitude and time rate
- Use of consolidation test data
5. Slope Stability Analysis
- Factors Affecting Slope Stability
- Soil properties, slope geometry, water conditions
- External loads and seismic effects
- Methods for Analyzing Slope Stability
- Limit equilibrium methods (e.g., Bishop, Janbu, Fellenius)
- Simplified and advanced numerical methods
- Techniques for Stabilizing Slopes
- Drainage control
- Reinforcement (geosynthetics, soil nails)
- Retaining structures and vegetation
6. Earth Retaining Structures
- Design Principles
- Types: gravity walls, cantilever walls, anchored walls, sheet piles
- Earth pressure theories (Rankine, Coulomb)
- Soil-Structure Interaction
- Active, passive, and at-rest earth pressures
- Factor of safety and stability considerations
- Stability Analysis
- Overturning, sliding, bearing capacity
- Structural design and material selection
7. Deep Foundations
- Types of Deep Foundations
- Pile foundations: driven, bored, composite
- Drilled shafts (caissons)
- Load Transfer Mechanisms
- Skin friction and end bearing
- Negative skin friction and group effects
- Design Considerations
- Geotechnical investigation requirements
- Load capacity and settlement criteria
- Installation effects and quality control
8. Ground Improvement Techniques
- Overview of Methods
- Mechanical compaction
- Grouting techniques
- Soil nailing and anchors
- Soil reinforcement with geosynthetics
- Selection Criteria
- Soil type, project requirements, environmental considerations
- Case Studies and Applications
9. Geosynthetics in Geotechnical Engineering
- Types of Geosynthetics
- Geotextiles, geomembranes, geogrids, geonets
- Applications
- Reinforcement
- Filtration and drainage
- Erosion control and separation
- Design and Installation Considerations
- Material properties
- Compatibility with soil and environment
10. Seismic Considerations in Geotechnical Design
- Seismic Hazards and Soil Behavior
- Liquefaction potential
- Seismic amplification and site effects
- Soil-Structure Interaction During Earthquakes
- Dynamic response of soil and foundation
- Foundation design for seismic loading
- Design Strategies for Mitigating Seismic Risks
- Earthquake-resistant foundation systems
- Ground improvement for seismic stability
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