西南交通大学学报2025，Vol.60Issue(3)：580-588,9.DOI:10.3969/j.issn.0258-2724.20230424
路桥过渡段纵连轨道板纵向力分布特征与上拱机理分析
Analysis of Longitudinal Force Distribution Characteristics and Arching Mechanism of Longitudinally Connected Track Slabs in Bridge-Subgrade Transition Section
摘要
Abstract
The mechanical behavior of longitudinally connected ballastless track slabs in the transition section of subgrade and bridge is complex,and arching disease is frequent.The П-type end spine ballastless track in the transition section of subgrade and bridge was taken as the research object,and a track-bridge-end spine-subgrade integrated finite element model was established.The bilinear cohesive force model was introduced to simulate the bonding relationship between the slabs and the interlayers,and the longitudinal force distribution of the longitudinally connected track slabs in the transition section of subgrade and bridge under different temperature loads and end spine displacements was analyzed.The stress-sensitive area of the end spine,namely,the longitudinal stress characteristics of the track slabs at the junction of the transition section and the supporting layer and the relationship between the extrusion deformation of the junction and the arching deformation,were studied.The results show that the longitudinal compressive stress level of the track slabs at the main end spine and the junction of the transition plate and the supporting layer is the highest,and the maximum value under the extreme positive temperature gradient is 19.91 MPa.The friction plate and the bridge section are small,which corresponds to the limit capacity of each structure of the end spine.With the development of diseases such as deterioration and void of subgrade materials,the longitudinal resistance and interlayer friction decrease continuously,which leads to the increase in longitudinal deformation of the end spine,the decrease in longitudinal stress of the track slabs in the end spine area,and the increase in longitudinal stress of the supporting layer of the junction.When the longitudinal deformation reaches 6 mm,the longitudinal compressive stress of the supporting layer of the junction reaches 18.55 MPa,and the crushing risk of the structure is very high.The compressive arching of the junction greatly affects the bonding between the slabs and the layers of the track structure and increases the risk of arching disease.The research results can provide a reference for further optimizing and renovating the diseases of the transition section of the longitudinally connected ballastless track slabs and ensuring the safe and stable operation of high-speed railways.关键词
CRTSⅡ型板式无砟轨道/内聚力模型/应力分析/损伤Key words
CRTSⅡballastless track slab/cohesive force model/stress analysis/damage分类
交通运输引用本文复制引用
蔡小培,王昌昌,董博,陈泽林,张乾..路桥过渡段纵连轨道板纵向力分布特征与上拱机理分析[J].西南交通大学学报,2025,60(3):580-588,9.基金项目
国家自然科学基金项目(52178405) （52178405）
京沪高速铁路股份有限公司科技研究项目(京沪科研-2020-13) （京沪科研-2020-13）
中国国家铁路集团有限公司科技研究开发计划(K2022G038) （K2022G038）
