Dynamics of Rail Transit Tunnel Systems - 1st Edition - ISBN: 9780128183823, 9780128183830

Dynamics of Rail Transit Tunnel Systems

1st Edition

Authors: Shunhua Zhou
Paperback ISBN: 9780128183823
eBook ISBN: 9780128183830
Imprint: Academic Press
Published Date: 4th April 2019
Page Count: 276
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Description

Dynamics of Rail Transit Tunnel Systems develops the dynamic theory of a rail transit tunnel system and provides research methods for the evaluation of long-term settlement of rail transit tunnels in soft soil, the service performance of tunnel structures, and the characterization of environmental vibration induced by trains. In recent years, a large number of rail transit tunnels have been constructed and put into operation, particularly in China. To evaluate the time-dependent degradation of tunnel structures and train-induced environmental vibration, a reliable model must be established to determine the dynamic response of a vehicle-track-tunnel-soil system, hence the introduction of this timely resource.

Key Features

  • Provides full theoretical background to help the reader gain an in-depth understanding of the various methods used for dynamic analysis of a rail transit tunnel system
  • Develops the dynamics theory and method of a rail transit tunnel system under the context of challenging engineering problems
  • Presents methods for analyzing the dynamic responses of rail transit tunnel-soil systems
  • Looks at problems that need to be solved in the future and proposes potential directions for future research

Readership

Engineers, railway engineers, transportation engineers, mechanical engineers; experts, practitioners, and graduate students in railway transit infrastructures; inspection specialists; geologists

Table of Contents

Chapter 1: Introduction
1.1 Development of Rail Transit
1.2 Characteristics of Underground Railway Systems
1.2.1 Source of Vibration
1.2.2 Components of Rail Tracks
1.2.3 Tunnel Structure
1.3 Typical Engineering Concerns Related to the Dynamics of Rail Transit Tunnel Systems
1.3.1 Long-Term Settlement and Induced Structural Damage of Metro Tunnels in Soft Soils
1.3.2 Environmental Vibration Problems
1.4 Existing Approaches and Models
1.5 Content and Scope of This Book
References
Chapter 2: A Multilayer Cylindrical Tunnel Model for Calculating the Dynamic
Response Subjected to Vertical and Horizontal Moving Loads Inside a Circular Tunnel
2.1 Introduction
2.2 Governing Equations of the Shell-Cylinder Model
2.2.1 Double Cylindrical Shell Equations
2.2.2 Saturated Porous Medium Equations
2.2.3 Solution for Particular Boundary Conditions
2.3 Simulation Results and Discussion
2.3.1 Dynamic Stress of Saturated Soil Subjected to Vertical Moving Loads
2.3.2 Effect of Horizontal Load on Dynamic Stress of Saturated Soils
References
Chapter 3: A Vehicle-Track-Tunnel-Soil Model for Evaluating the Dynamic Response of a Double-Line Underground Railway Tunnel
in a Poroelastic Full-Space
3.1 Introduction
3.2 Model Development for a Railway Tunnel
3.2.1 Simulation of a Tunnel in a Poroelastic Full-Space
3.2.2 Coupling of the Railway Track
3.2.3 Simulation of the Vehicle Load
3.3 Simulation Results and Discussion
3.3.1 Validation Against Existing Tunnel Model
3.3.2 Case Study of a Single-Line Metro Tunnel
3.3.3 Case Study of a Double-Line Metro Tunnel
References
Chapter 4: Dynamic 2.5D Green’s Function for a Saturated Porous Medium
4.1 Introduction
4.2 Governing Equations and General Solutions
4.2.1 Biot’s Theory: Governing Equations
4.2.2 Displacement Potentials and General Solutions
4.3 Dynamic 2.5D Green’s Function for a Poroelastic Full-Space
4.3.1 Point Load Applied to the Solid Skeleton Along the X-Axis
4.3.2 Point Load Applied to the Solid Skeleton Along the Y-Axis
4.3.3 Point Load Applied to the Solid Skeleton Along the Z-Axis
4.3.4 Dilatation Source Applied Within the Pore Fluid
4.4 Dynamic 2.5D Green’s Function for a Poroelastic Half-Space
4.4.1 Point Load Applied to the Solid Skeleton Along the X-Axis
4.4.2 Point Load Applied to the Solid Skeleton Along the Y-Axis
4.4.3 Point Load Applied to the Solid Skeleton Along the Z-Axis
4.4.4 Dilatation Source Applied Within the Pore Fluid
4.5 Dynamic 2.5D Green’s Function for a Multilayered Poroelastic Half-Space
4.6 Numerical Examples
4.6.1 Comparison With the 2.5D Green’s Function for an Elastodynamic Half-Space
4.6.2 Comparison With the 3D Green’s Function for a Poroelastic Half-Space
4.6.3 Comparison With the 3D Green’s Function for a Layered Poroelastic Half-Space
4.6.4 Dynamic Response for Point Source in a Multilayered Poroelastic Half-Space
References
Chapter 5: 2.5D FE-BE Model for the Prediction of Train-Induced Vibration From a Tunnel in Saturated Soil
5.1 Introduction
5.2 2.5D Coupled FE-BE Model for the Coupled Tunnel-Soil System
5.2.1 2.5D FE Model for a Tunnel
5.2.2 2.5D BE Model for the Saturated Soil
5.2.3 2.5D FE-BE Coupling for Tunnel<SOIL Interaction
5.3 Coupled Vehicle-Track-Tunnel-Soil Model
5.4 Numerical Examples
5.4.1 Comparison With the Semianalytical Method for a Special Example
5.4.2 Comparison With the 2.5D FE-BE Model for Single-Phase Soil
5.4.3 Dynamic Response for a Quasi-Rectangular Tunnel in a Poroelastic Half-Space
References
Chapter 6: An Efficient Method for Predicting Train-Induced Vibrations From a Tunnel in a Poroelastic Half-Space
6.1 Introduction
6.2 Methodology
6.3 Numerical Examples
6.3.1 Comparison With the 2.5D FE-BE Model
6.3.2 Train-Induced Vibrations From a Circular Tunnel in a Poroelastic Half-Space
6.3.3 Frequency-Response Functions for Stationary Harmonic Loads Acting on the Rails
6.3.4 Dynamic Response Induced by the Quasi-Static Train Load
6.3.5 Dynamic Response Induced by the Dynamic Train Load
Chapter 7: Semianalytical Dynamic Substructural Model for Soil-Tunnel Systems in the Time Domain
7.1 Introduction
7.2 Semianalytical Finite Element Model for Tunnel-Soil Systems
7.2.1 Cylindrical Shell Equations for Modeling Tunnel
7.2.2 Equations for Continuous Elastic Soil
7.2.3 Assembly of the Global Matrix
7.2.4 Semianalytical Viscoelastic Boundary Element
7.3 Selection of Computing Parameters
7.3.1 The Form of the Tunnel Element
7.3.2 Time Step
7.3.3 Axle Mode Number
7.3.4 Ring Mode Number
7.4 The Dynamic Response of the Tunnel-Soil System
7.4.1 Comparative Analysis With the Pipe in Pipe Model
7.4.2 The Dynamic Response of the Tunnel-Soil System Under Moving Train Loads
References
Chapter 8: Dynamic Substructural Model for Vehicle-Track-Tunnel-Soil Systems in the Time Domain
8.1 Introduction
8.2 Vehicle Dynamics Model and Equation
8.3 Model of the Track Subsystem
8.4 The Interaction Between Subsystems
8.4.1 Coupling the Train With the Rail
8.4.2 Coupling the Rail with the Concrete Bed
8.4.3 Coupling the Concrete Bed with the Tunnel
8.5 Procedure for Evaluating Semianalytical Dynamic Equations
8.6 Dynamic Responses of the System Induced by Metro Vehicles
8.7 The Dynamic Response Due to the Passage of a Train on a Floating Slab Track
8.7.1 Floating Slab Track and Its Modeling
8.7.2 The Dynamic Response of the FST System
References
Chapter 9: Field Test of Train-Induced Vibrations
9.1 Introduction
9.2 Fundamentals of Vibration Measurement
9.2.1 Parameters to be Measured
9.2.2 Interpretation of Measured Data
9.3 Example of Vibration Measurements
9.3.1 Engineering Background
9.3.2 Level 1 Measurement
9.3.3 Level 2 Measurement
9.3.4 Level 3 Measurement
References
Appendices
Index

Details

No. of pages:
276
Language:
English
Copyright:
© Academic Press 2019
Published:
4th April 2019
Imprint:
Academic Press
Paperback ISBN:
9780128183823
eBook ISBN:
9780128183830

About the Author

Shunhua Zhou

Professor in the College of Transportation Engineering at Tongji University, China. He has a long professional career in engineering mechanics and advanced applied engineering technology related to the construction and maintenance of railway transit infrastructure. His research includes the theory and engineering practice of excavation, evaluation of settlement and deformation of railway transit structure, and vibration reduction of railway transit systems. His research team developed a new method of tunnel systems dynamics for the deformation analysis of railway transit structures, and based on this a systematic approach for ground deformation control in the construction of tunnels across operational railways. Using this approach, a tunnel was successfully built for the first time beneath an operating high-speed railway, with a speed of 300km/h.

Affiliations and Expertise

Professor, College of Transportation Engineering, Tongji University, China

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