| List of abbreviations | 第6-11页 |
| Abstract | 第11-12页 |
| 1. Introduction | 第15-19页 |
| 1.1 Research background | 第15-16页 |
| 1.2 Motivation and objective | 第16-18页 |
| 1.3 State-of-the-art of NDT in Ballastless Track Inspection | 第18-19页 |
| 2. Ballastless Track | 第19-29页 |
| 2.1 Development and Significance | 第19-25页 |
| 2.1.1 Typical System Abroad | 第19-23页 |
| 2.1.2 Typical System in China | 第23-25页 |
| 2.2 Typical Defects | 第25-29页 |
| 3. Ultrasonic Non-Destructive Testing | 第29-40页 |
| 3.1 Ultrasonic echo testing | 第29-31页 |
| 3.2 Acquisition Parameters | 第31-35页 |
| 3.2.1 Ultrasonic Dual Element Probe (Low-frequency Flaw Detector A1220MONOLITH) | 第31-33页 |
| 3.2.2 Linear Array (Ultrasonic Tomograph A1040 MIRA) | 第33-35页 |
| 3.3 Synthetic Aperture Focusing Technique (SAFT) | 第35-37页 |
| 3.4 BAM Automated Measurement Scanner | 第37-38页 |
| 3.5 Example of Application | 第38-40页 |
| 4. Testing of Deutsche Bahn (DB) Real Ballastless Track | 第40-45页 |
| 4.1 Experiment | 第40-42页 |
| 4.2 Results and Discussions | 第42-45页 |
| 5. Experimental Models of Small Scale | 第45-66页 |
| 5.1 Sample 1 (two concrete blocks) | 第45-53页 |
| 5.2 Sample 2 (one concrete and one polyamide) | 第53-58页 |
| 5.3 Sample 3 (two concrete blocks and one polyamide between them) | 第58-65页 |
| 5.4 Summary | 第65-66页 |
| 6. Three Layer System of Large Scale for Basic Investigation of Defect Localization inLaboratory | 第66-74页 |
| 6.1 Sample 4:Large three layer slab:concrete (300 mm)/polyamide/concrete (250 mm) | 第66-69页 |
| 6.2 Sample 5:Large three layer slab:concrete (250mm)/polyamide/concrete (100 mm) | 第69-72页 |
| 6.3 Summary | 第72-74页 |
| Conclusion and Outlook | 第74-77页 |
| Acknowledgements | 第77-78页 |
| Reference | 第78-82页 |
| 攻读硕士期间发表论文及科研成果 | 第82页 |
