高速、重载铁路轨道结构耐久性提升之关键科学与技术问题OA

High-speed passenger transport and heavy-haul freight transport are the main features of modern railway development.At present,China has built globally leading high-speed and heavy-haul railway networks in terms of scale,and a large number of lines have entered a critical stage of long-term high-load operation and maintenance.How to further enhance the durability of in-service track structures in complex and harsh operating environments and ensure the long-term highly safe,highly stable,and highly reliable service of high-speed and heavy-haul railway track structures has become a major strategic challenge facing the rail transit engineering field in China in the new era.In view of the structural characteristics of high-speed and heavy-haul railway track structures in China and the features of their complex operating environments,to achieve the durability enhancement of track structures,two key scientific issues were condensed(① evolution mechanism of service performance and life assessment and prediction of high-speed and heavy-haul railway track structures and② durability enhancement mechanism and multi-dimensional regulation mechanism of track structures under complex service conditions),as well as three key technical issues(① high-frequency fatigue characteristics of high-speed railway track components and collaborative regulation technology of wheel-rail system vibration,② key technologies for component strengthening and performance enhancement of heavy-haul railway track structures under high-traffic-volume conditions,and ③ efficient reinforcement,repair,and rapid retrofitting technologies for track structures).A systematic review of the state-of-the-art progress and cutting-edge advances in the research field was provided.On this basis,the engineering applications and full-scale field validation outcomes of a complete set of durability enhancement technologies,independently developed and deployed by the authors'team for high-speed and heavy-haul railway lines across typical service conditions were demonstrated.Finally,the future development prospects and critical research priorities in this field were clarified.