| 摘要 | 第4-5页 |
| ABSTRACT | 第5-6页 |
| Chapter 1 Introduction | 第9-17页 |
| 1.1.Background and significance | 第9-14页 |
| 1.1.1.Engineering background | 第10-12页 |
| 1.1.2.Contents and technical routine | 第12-13页 |
| 1.1.3.Objectives and significances | 第13-14页 |
| 1.2 Literature reviews | 第14-17页 |
| Chapter 2 Numerical modeling of dynamic response analysis of high railway subgrade in seasonal frozen region | 第17-55页 |
| 2.1 Introduction | 第17页 |
| 2.2 Numerical modeling method | 第17-44页 |
| 2.2.1 Problems simplification and basic assumptions | 第17-18页 |
| 2.2.2 Constitutive model of fillings and parameters of models | 第18-21页 |
| 2.2.3 Simulations of rails and sleepers (track slab for ballastless track) | 第21-26页 |
| 2.2.4 Simulation of interaction among rail, sleeper (track slab for ballastless track) and subgrade | 第26-30页 |
| 2.2.5 Infinite Element Mesh and infinite boundary conditions | 第30-32页 |
| 2.2.6 Elementary and total matrixes | 第32-37页 |
| 2.2.7.Simulation of train load | 第37-41页 |
| 2.2.8.Equations and solutions of system | 第41-44页 |
| 2.3.Simulation of subgrade temperature field | 第44-54页 |
| 2.4 Summary | 第54-55页 |
| Chapter 3 Numerical analysis of high railway subgrade dynamic response and vibration mitigation techniques in seasonal frozen region | 第55-69页 |
| 3.1 Introduction | 第55页 |
| 3.2 Modeling of dynamic response a track-subgrade-ground system | 第55-59页 |
| 3.2.1 Finite element model | 第55-57页 |
| 3.2.2 Simulation results | 第57-59页 |
| 3.3 Assessment of vibration mitigation techniques | 第59-68页 |
| 3.3.1 Stiffness of the surface layer of subgrade bed | 第59-61页 |
| 3.3.2 Stiffener block at the surface of subgrade | 第61-64页 |
| 3.3.3 Submerged stiffener block beneath the surface of subgrade | 第64-68页 |
| 3.4 Summary | 第68-69页 |
| Chapter 4 Numerical analysis of influencing factor for high railway subgrade dynamic response in seasonal frozen region | 第69-87页 |
| 4.1 Introduction | 第69页 |
| 4.2 Analysis of main influencing factors for subgrade dynamic response | 第69-86页 |
| 4.2.1 Embankment height and slope | 第69-76页 |
| 4.2.2.Ballast and ballastless track | 第76-80页 |
| 4.2.3.Axle load of high-speed train | 第80-86页 |
| 4.3 Summary | 第86-87页 |
| Chapter 5 Conclusions | 第87-91页 |
| 5.1.Conclusions and innovations | 第87-89页 |
| 5.2.Problems and further research | 第89-91页 |
| Reference | 第91-97页 |
| ACKNOWLEDGEMENTS | 第97页 |
