發(fā)布時間：2023-03-19 04:43

　　中國的高速鐵路在過去幾年里經(jīng)歷了巨大的發(fā)展,至今中國擁有世界上50%以上的高速鐵路總里程,2020年高速鐵路總里程將有望達到約21000公里。高速鐵路對加強國際合作的―一帶一路‖跨境項目的基礎設施建設具有重要意義。盡管高速鐵路為經(jīng)濟的發(fā)展和跨境整合提供了良好的解決方案,但未來需要的維護技術是一個重大問題。隨著運營時間的增加,高速鐵路面臨著性能退化、自然災害等問題,在長期運營中,不可避免地會出現(xiàn)混凝土裂縫、鋼材腐蝕、CA砂漿層離隙等病害,嚴重影響列車的安全運營。首先,通過傳統(tǒng)檢查手段包括金屬帶、卷尺、直尺等,在高速鐵路上海虹橋站觀測了CA砂漿層離隙問題。對病害結構的內(nèi)部狀況進行初步檢測。這些病害有可能導致列車通過時軌道上的振動放大。在分析CA砂漿層離隙病害特征的基礎上,通過有限元數(shù)值模擬手段,計算病害分布對機車振動響應的定量影響。其次,將近年來新興的分布式光纖監(jiān)測技術與沖擊映像檢測方法相結合,對CA砂漿層離隙病害進行檢測。對CA砂漿層修補前后軌道板振動監(jiān)測數(shù)據(jù)進行分析。振動監(jiān)測使用DOVS光纖連續(xù)分布式振動監(jiān)測系統(tǒng),DOVS是基于Φ-OTDR光纖干涉原理的分布式振動監(jiān)測系統(tǒng)。系統(tǒng)通過測量...

【文章頁數(shù)】：84 頁

【學位級別】：碩士

【文章目錄】：
摘要
ABSTRACT
CHAPTER1 INTRODUCTION
    1.1 Research background
    1.2 Domestic and overseas research status
        1.2.1 High-speed railway underline structural defects detection
        1.2.2 Optical fiber sensing technology
    1.3 Research contents and objectives
CHAPTER2 STRUCTURAL FAULTS DETECTION USING DISTRIBUTED OPTICAL FIBER SENSING TECHNOLOGY
    2.1 Distributed optical fiber sensing technology
        2.1.1 OTDR distributed sensing technology
        2.1.2 Distributed vibration sensing technology based onΦ -OTDR
    2.2 Application of optical fiber sensors for space-time monitoring
    2.3 Summary
CHAPTER3 HIGH-SPEED RAILWAY UNDERLINE STRUCTURE AND DISEASE STATUS
    3.1 High-speed railway underline structure
        3.1.1 Ballastless track
        3.1.2 Foundation
    3.2 Distribution and types of underline structural faults
        3.2.1 Ballastless track Structural faults
        3.2.2 Foundation faults
    3.3 Interpretation of cement asphalt layer structural defects
    3.4 Summary
CHAPTER4 NUMERICAL ANALYSIS OF HIGH-SPEED RAILWAY UNDERLINE STRUCTURE
    4.1 Finite element analysis
        4.1.1 Material parameters
        4.1.2 Boundary conditions
    4.2 Two-dimensional FEM to simulate the track plate vibration response under different distributions states of voided cement asphalt layer
        4.2.1 Vehicle-track model
        4.2.2 Dynamic loads
        4.2.3 Results and discussion
    4.3 Three-dimensional FEM to simulate the track plate vibration response under different distributions states of voided cement asphalt layer
        4.3.1 Sequential loading of three-dimensional model
        4.3.2 Dynamic loads
        4.3.3 Results and discussion
    4.4 Comparison of the vibration response using two and three-dimensional numerical simulation
    4.5 Summary
CHAPTER5 APPLICATION OF OPTICAL FIBER SENSING TECHNOLOGY
    5.1 Hongqiao high-speed railway optical fiber vibration monitoring
        5.1.1 Monitoring section and visual inspection
        5.1.2 Impact imaging detection method
        5.1.3 Optical fiber sensor arrangement
    5.2 On-site monitoring process
        5.2.1 Data analysis method
        5.2.2 Data Processing Results
    5.3 Summary
CHAPTER6 CONCLUSIONS AND RECOMMENDATIONS
    6.1 Conclusions
    6.2 Recommendations
REFERENCES
ACKNOWLEDGEMENT
PUBLICATION



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