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Soil Dynamics

Soil Dynamics. Instructor: Prof. Deepankar Choudhury, Department of Civil Engineering, IIT Bombay. This course discusses the behaviour and properties/response of soil as a material subjected to the dynamic or cyclic time-dependent loading. Also the design and principle for machine foundations comes along with this course to consider the dynamic properties of both soil and foundation as combined mass. Behaviour of various geotechnical structures such as shallow and deep foundations, retaining structures, slopes, subgrade soil below railway, pavement, runway due to various types of time‐dependent dynamic loading are discussed here with reference to codal provisions. The advanced course material on soil dynamics will be very useful to undergraduate students, post‐graduate students, researchers, teachers and practitioners. A number of selected problems will be solved to illustrate the concepts clearly. (from nptel.ac.in)

Lecture 09 - Maxwell's Diagram of DMF, Discussion on Phase


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Lecture 01 - Introduction
Vibration Theory
Lecture 02 - Degrees of Freedom, SDOF System, Types of Vibrations
Lecture 03 - SDOF System, Types of Vibrations, Free Vibration
Lecture 04 - Problems on Torsional Motion
Lecture 05 - Damped Free Vibrations
Lecture 06 - Damped Free Vibrations, Definition of Critical Damping and Problems
Lecture 07 - Decay of Motion
Lecture 08 - Forced Vibrations, Dynamic Magnification Factor (DMF)
Lecture 09 - Maxwell's Diagram of DMF, Discussion on Phase
Lecture 10 - Transmissibility Ratio, Response to Arbitrary, Step and Pulse Excitations
Lecture 11 - Response to Arbitrary, Step and Pulse Excitations, Response to Impact Load
Lecture 12 - Vibration Isolation, Vibrations Measuring Instruments
Lecture 13 - Solutions of Quiz Questions, Multi-degree of Freedom Systems
Lecture 14 - MDOF System: Equation of Motion, Longitudinal Waves in an Infinitely Long Rod
Wave Propagation
Lecture 15 - Dimensional Wave Propagation, Waves in Semi-infinite Media, Rayleigh Wave
Lecture 16 - Love Wave, Waves in Layered Medium, 3D Case-Inclined Wave, Earthquake Waves
Lecture 17 - Earthquake Waves; P-Waves, S-Waves, 3 Circle Method, Estimation of Earthquake Epicentre
Dynamic Soil Properties
Lecture 18 - Stresses in Soil Element, Field Tests, Seismic Reflection Test
Lecture 19 - Seismic Reflection Test, SASW Test, Laboratory and Model Tests
Lecture 20 - Centrifuge Tests Stress Strain Behaviour of Cyclically Loaded Soils
Lecture 21 - Estimation of Gmax, Modulus Reduction Curves, Variation of Damping Ratio, Cyclic Plate Load Test
Lecture 22 - Liquefaction, Preliminary Screening, Simplified Procedure for Liquefaction
Lecture 23 - Cyclic Stress Ratio, Evaluation of CRR, Correction Factors, Corrections for SPT
Lecture 24 - Becker Penetrometer Test (BPT), Cone Penetrometer Test (CPT), SPT vs BPT
Machine Foundations
Lecture 25 - Types of Machine Foundations, Methods of Analysis, Design of Machine Foundations
Lecture 26 - Tschebotarioff's Reduced Natural Frequency Method
Lecture 27 - Problems on Tschebotarioff's Method, Mass-Spring-Dashpot (MSD) Model
Lecture 28 - MSD Model - Yawing Mode of Vibration, Use of MSD Model for Analysis
Lecture 29 - Problems on Use of MSD Model for Analysis, Rocking Mode of Vibrations
Lecture 30 - Torsional Mode/Yawing Mode, Constraint Force Type Excitation, EHS Theory
Lecture 31 - EHS Theory, Vibrational Control
Lecture 32 - Use of EHS Theory for Analysis
Lecture 33 - Use of EHS Theory for Analysis (cont.)
Soil Improvement Techniques
Lecture 34 - Liquefaction Mitigation Methods, Vibro Compaction, Densification Techniques
Lecture 35 - Soil Improvement Methods, Dynamic Compaction, Reinforcement Techniques
Dynamic Soil-Structure Interaction
Lecture 36 - Force-based Analysis, Dynamic Analysis using MSD Model
Lecture 37 - Behaviour of Subgrade Soil below Rail Track
Lecture 38 - Quiz