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7.75. Finite Elements Applied to Geotechnical Engineering (Elective)

7.75.1. Justification ↑ Back to top

Finite Elements Applied to Geotechnical Engineering introduces the finite element method as a numerical tool for the analysis and design of geotechnical structures and problems that cannot be solved reliably with classical closed-form methods. Building on the shear-strength, consolidation, and design framework developed in Soil Mechanics II and the numerical modeling background introduced in Fluid Mechanics II, the course first develops the mathematical foundations of the finite element method (variational formulation, Galerkin approximation, finite element spaces, and error estimation) and then applies them to geotechnical-specific problems: boundary conditions, initial stress states, and staged-construction modeling; one-dimensional analysis of consolidation and pile-soil interaction; two-dimensional plane-strain analysis of excavations, embankments, and retaining structures; an introduction to dynamic numerical analysis of seismic geotechnical problems; and the constitutive soil models (Mohr-Coulomb, Cam-Clay, and Hardening Soil Model) that make nonlinear soil behavior tractable in finite element software. As part of the Geotechnical Engineering specialization track, the course prepares students to use modern numerical modeling tools in professional geotechnical design practice.

7.75.2. Generales Goals ↑ Back to top

1. Derive and formulate the finite element method (weak formulation, Galerkin approximation, and error estimation) for boundary value problems.
2. Establish appropriate boundary conditions, initial stress states, and staged-construction sequencing for geotechnical finite element models.
3. Formulate one-dimensional finite element models for consolidation and pile-soil interaction problems.
4. Develop two-dimensional plane-strain finite element models for excavation, embankment, and retaining-structure design problems.
5. Analyze the dynamic response of geotechnical systems using numerical dynamic analysis.
6. Select and apply constitutive soil models (Mohr-Coulomb, Cam-Clay, Hardening Soil Model) appropriate to nonlinear geotechnical finite element analysis.

7.75.3. Contribution to Outcomes ↑ Back to top

ABET-1) An ability to identify, formulate, and solve complex engineering problems by applying principles of engineering, science, and mathematics. (Usage)

ABET-2) An ability to apply engineering design to produce solutions that meet specified needs with consideration of public health, safety, and welfare, as well as global, cultural, social, environmental, and economic factors. (Usage)

ABET-6) An ability to develop and conduct appropriate experimentation, analyze and interpret data, and use engineering judgment to draw conclusions. (Usage)

7.75.4. Content ↑ Back to top

7.75.4.1. Finite Element Method (6 hours) [Skills ABET-1,ABET-6] ↑ Back to top

Bibliography: (Reddy, 2019b)

Topics

1. Weak (variational) formulation of boundary value problems and Sobolev spaces
2. Galerkin method: finite-dimensional approximation spaces and the stiffness matrix
3. Triangular and quadrilateral finite element spaces: Lagrange elements and conformity
4. A priori error estimates: Céa's lemma and interpolation error bounds
5. A posteriori error estimates and adaptive mesh refinement

Learning Outcomes

1. Derive the weak formulation of an elliptic BVP and show its equivalence to the strong form [Familiarity]
2. Assemble the global stiffness matrix and load vector for a linear finite element discretization [Usage]
3. Estimate the \(H^1\) error of a finite element solution using Céa's lemma and interpolation theory [Assessment]

7.75.4.2. Geotechnical Numerical Modeling and Applications (50 hours) [Skills ABET-1,ABET-2,ABET-6] ↑ Back to top

Bibliography: (Potts and Zdravković, 2001; Zienkiewicz et al., 2013; Kramer, 1996)

Topics

1. Boundary conditions, initial stress state, and staged construction (excavation and fill sequencing) in geotechnical finite element models
2. Soil-structure interaction modeling: interface elements and contact behavior between soil and structural elements
3. One-dimensional numerical models for consolidation and axially loaded pile-soil interaction
4. Two-dimensional plane-strain numerical models for excavations, embankments, and retaining structures
5. Dynamic numerical analysis of seismic site response and soil-structure dynamic interaction
6. Constitutive soil models: Mohr-Coulomb, Cam-Clay, and Hardening Soil Model for nonlinear geotechnical analysis

Learning Outcomes

1. Explain the boundary conditions, initial stress state, and staged construction sequencing required for geotechnical finite element models [Familiarity]
2. Model soil-structure interaction using interface elements in a finite element mesh [Usage]
3. Formulate one-dimensional finite element models for consolidation and pile-soil interaction problems [Usage]
4. Develop two-dimensional plane-strain finite element models for excavation, embankment, and retaining-structure problems [Usage]
5. Analyze the dynamic response of geotechnical systems using numerical dynamic analysis [Assessment]
6. Select and apply appropriate constitutive soil models (Mohr-Coulomb, Cam-Clay, Hardening Soil Model) in nonlinear finite element analysis [Usage]

7.75.4.3. Geotechnical Earthquake Engineering (8 hours) [Skills ABET-1,ABET-6] ↑ Back to top

Bibliography: (Kramer, 1996; Das, 2019)

Topics

1. Single-degree-of-freedom dynamic systems and one-dimensional wave propagation through soil deposits
2. Site response and ground motion amplification
3. Seismic hazard analysis and design ground motions
4. Liquefaction susceptibility and triggering mechanisms
5. Cyclic stress ratio and liquefaction evaluation procedures
6. Effects of liquefaction on structures and infrastructure
7. Dynamic soil properties and laboratory testing
8. Design of foundations for vibrating machinery under dynamic loading
9. Ground improvement methods for liquefaction mitigation
10. Lateral spreading and flow failures
11. Seismically induced settlement and bearing capacity
12. Performance-based design for geotechnical earthquake engineering

Learning Outcomes

1. Formulate single-degree-of-freedom models and one-dimensional wave-propagation equations to characterize seismic wave transmission through soil deposits [Usage]
2. Explain site response effects and ground motion characteristics [Familiarity]
3. Determine design ground motions for geotechnical seismic analysis [Assessment]
4. Evaluate liquefaction susceptibility using field investigation data [Usage]
5. Calculate cyclic stress ratios and assess liquefaction potential [Assessment]
6. Assess the consequences of liquefaction on foundations and structures [Familiarity]
7. Characterize dynamic soil properties from laboratory and field tests [Usage]
8. Proportion machine foundations considering dynamic soil-foundation stiffness, resonance avoidance, and permissible vibration amplitudes [Assessment]
9. Select and design ground improvement methods to mitigate liquefaction [Assessment]
10. Predict lateral spreading displacements and flow failure potential [Usage]
11. Analyze seismically induced settlement and reduced bearing capacity [Assessment]
12. Implement performance-based approaches for seismic geotechnical design [Assessment]

7.75.5. Bibliography ↑ Back to top

Reddy, J. N. (2019b). An Introduction to the Finite Element Method. McGraw-Hill, 4th edition.

Potts, D. M. and Zdravković, L. (2001). Finite Element Analysis in Geotechnical Engineering: Theory and Application. Thomas Telford Publishing.

Zienkiewicz, O. C., Taylor, R. L., and Zhu, J. Z. (2013). The Finite Element Method: Its Basis and Fundamentals. Butterworth-Heinemann, 7th edition.

Kramer, S. L. (1996). Geotechnical Earthquake Engineering. Prentice Hall.

Das, B. M. (2019). Principles of Geotechnical Engineering. Cengage Learning, 9th edition.