Dynamics of Soils and Their Engineering Applications

✍ Scribed by Swami Saran

• Publisher: CRC Press
• Year: 2023
• Tongue: English
• Leaves: 587
• Edition: 1
• Category: Library

✦ Synopsis

The book offers systematic dynamic analysis of soils and their engineering applications, including machine foundations, and aims to develop a clear understanding of the subject. It comprises sixteen chapters. Chapter 1 introduces the reader to the various problems in soil dynamics. In Chapter 2, concepts of theory of vibrations are discussed along with their applications in designing Vibration Absorbers and Pickups. Wave propagation in elastic medium including wave refraction in layered medium is covered in Chapter 3. Chapter 4 deals with the procedure of determining dynamic properties of soils using various laboratory and field tests. Dynamic earth pressures in retaining walls and dynamic bearing capacity of footings are dealt with in Chapters 5 and 6 respectively. Chapters 7and 8 respectively deal with dynamic behavior of pile foundations and slopes. Causes of liquefaction of soils and prediction of liquefaction potential have been discussed in Chapter 9. In Chapter 10, the procedure of estimating the unbalanced forces in various types of machines are covered. Chapters 11, 12 and 13 deal with the analysis and design of foundations of reciprocating machine, hammer, and turbo-generators respectively. In Chapter 14, problems of vibration isolation and screening are dealt with. Chapter 15 discusses the analysis and design of reinforced earth wall located in seismic areas. A new concept of a conventional rigid retaining wall having reinforced backfill is presented in Chapter 16, giving complete analysis and design procedure considering seismic forces.

✦ Table of Contents

Cover
Title Page
Copyright Page
Dedication
Preface
Table of Contents
1. Introduction
1.1 Objective and Overview
1.2 Earthquake Loading
1.3 Equivalent Dynamic Load to an Actual Earthquake Load
1.4 Seismic Force for Pseudo-Static Analysis
Illustrative Examples
References
Practice Problems
2. Theory of Vibrations
2.1 Objective and Overview
2.2 Definitions
2.3 Harmonic Motion
2.4 Vibrations of a Single Degree Freedom System
2.5 Vibration Isolation
2.6 Theory of Vibration Measuring Instruments
2.7 Vibration of Multiple Degree Freedom Systems
2.8 Undamped Dynamic Vibration Absorber
2.9 Dry Friction or Coulomb Damping
2.10 Systems under Transient Vibrations
Illustrative Examples
Practice Problems
3. Wave Propagation in an Elastic Homogeneous and Isotropic Medium
3.1 General
3.2 Stress, Strain and Elastic Constants
3.3 Longitudinal Elastic Waves in a Rod of Infinite Length
3.4 Torsional Vibration of a Rod of Infinite Length
3.5 End Conditions
3.6 Longitudinal Vibrations of Rods of Finite Length
3.7 Torsional Vibrations of Rods of Finite Length
3.8 Wave Propagation in an Infinite, Homogeneous, Isotropic, and Elastic Medium
3.9 Wave Propagation in Elastic Half Space
3.10 Geophysical Prospecting
3.11 Typical Values of Compression Wave and Shear Wave Velocities
Illustrative Examples
References
Practice Problems
4. Dynamic Soil Properties
4.1 General
4.2 Laboratory Techniques
4.3 Field Tests
4.4 Factors Affecting Shear Modulus, Elastic Modulus and Elastic Constants
Illustrative Examples
References
Practice Problems
5. Dynamic Earth Pressure
5.1 General
5.2 Pseudo-Static Methods
5.3 Displacement Analysis
Illustrative Examples
References
Practice Problems
6. Dynamic Bearing Capacity of Shallow Foundations
6.1 General
6.2 Pseudo-Static Analysis
6.3 Bearing Capacity of Footings
6.4 Settlement, Tilt and Horizontal Displacement
6.5 Dynamic Analysis
6.6 Seismic Bearing Capacity and Seismic Settlement
Illustrative Examples
References
Practice Problems
7. Pile Foundations under Dynamic Loads
7.1 Introduction
7.2 Pseudo-Static Analysis
7.3 Single Pile under Vertical Vibrations
7.4 Single Pile under Lateral Vibrations
7.5 Group Action under Dynamic Loading
Illustrative Examples
References
Practice Problems
8. Seismic Stability Analysis of Slopes
8.1 General
8.2 Pseudo-Static Methods
8.3 Displacement Analysis
Illustrative Examples
References
Practice Problems
9. Liquefaction of Soils
9.1 General
9.2 Definitions
9.3 Mechanism of Liquefaction
9.4 Laboratory Studies
9.5 Dynamic Trixial Test
9.6 Cyclic Simple Shear Test
9.7 Comparison of Cyclic Stresses Causing Liquefaction under Triaxial and Simple Shear Conditions
9.8 Standard Curves and Correlations for Liquefaction
9.9 Evaluation of Zone of Liquefaction in Field
9.10 Vibration Table Studies
9.11 Field Blast Studies
9.12 Procedures Based on In-Situ Tests
9.13 Factors Affecting Liquefaction
9.14 Anti-liquefaction Measures
9.15 Studies on Use of Gravel Drains
9.16 Evaluation of the Effects of Liquefaction
Illustrative Examples
References
Practice Problems
10. General Principles of Machine Foundation Design
10.1 General
10.2 Types of Machines and Foundations
10.3 General Requirements of Machine Foundations
10.4 Permissible Amplitude
10.5 Allowable Soil Pressure
10.6 Permissible Stresses of Concrete and Steel
10.7 Permissible Stresses of Timber
References
11. Foundations of Reciprocating Machines
11.1 General
11.2 Modes of Vibration of a Rigid Foundation Block
11.3 Methods of Analysis
11.4 Linear Elastic Weightless Spring Method
11.5 Elastic Half-Space Method
11.6 Effect of Footing Shape on Vibratory Response
11.7 Dynamic Response of Embedded Block Foundations
11.8 Soil Mass Participating in Vibrations
11.9 Design Procedure for a Block Foundation
Illustrative Examples
References
Practice Problems
12. Foundations of Impact Type Machines
12.1 General
12.2 Dynamic Analysis
12.3 Design Procedure for Hammer Foundation
Illustrative Examples
References
Practice Problems
13. Foundations of Rotary Machines
13.1 General
13.2 Special Considerations
13.3 Design Criteria
13.4 Loads on a T.G. Foundation
13.5 Methods of Analysis and Design
13.6 Resonance Method
13.7 Amplitude Method
13.8 Combined Method
13.9 Three Dimensional Analysis
Illustrative Example
References
Practice Problems
14. Vibration Isolation and Screening
14.1 General
14.2 Force Isolation
14.3 Motion Isolation
14.4 Screening of Vibrations by Use of Open Trenches
14.5 Passive Screening by Use of Pile Barriers
Illustrative Examples
References
Practice Problems
15. Reinforced Soil Wall
15.1 General
15.2 Analysis and Design
15.3 Construction of a Reinforced Soil Wall
15.4 Drainage
Illustrative Example
References
Practice Problems
16. Walls Having Reinforced Sand Backfills
16.1 General
16.2 Brief Review
16.3 Analysis
16.4 Design Charts
Illustrative Example
References
Practice Problems
Index