路桥过渡段双块式无砟轨道道床板上拱整治方案  

Rectification Plan for Bed Slab Arch of Ballastless Track with Double-block Sleeper in Subgrade-bridge Transition Section

作　　者：任西冲 REN Xichong(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China;Hubei Key Laboratory of Railway Track Safety Service,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]铁路轨道安全服役湖北省重点实验室,武汉430063

出　　处：《铁道建筑》2024年第6期43-49,共7页Railway Engineering

基　　金：中铁第四勘察设计院集团有限公司科技研发课题(2021K004,KY2023119D);广东省交通运输厅科技项目(2021-J-001)。

摘　　要：针对路桥过渡段连续型双块式无砟轨道端梁位置道床板上拱病害,建立理论分析模型,研究了层间黏结状态和端梁支承条件对道床板上拱变形的影响规律;提出五种植筋方案,并对比分析了各方案的整治效果。结果表明:整体上,道床板在路基侧距离端梁中心10 m范围内上拱,最大上拱位置距离端梁中心约3 m;随着层间抗拉和抗剪强度增加,道床板最大垂向位移呈非线性减小趋势,层间黏结强度显著抑制了道床板的上拱变形;层间摩擦因数以及支承层、级配碎石、AB组填料造成的端梁侧向支承刚度变化对道床板上拱变形的影响相对较小;在距离端梁20 m范围以外植筋对道床板上拱变形的限制较小,增加路基侧距离端梁10 m范围内植筋可以明显减小道床板上拱变形。Regarding the arch disease on the track bed slab at the end beam position of the continuous ballastless track with double-block sleeper in the subgrade-bridge transition section,a theoretical analysis model was established to study the influence of interlayer bonding state and end beam support conditions on the deformation of the arch on the track bed slab.Five reinforcement planting schemes were proposed,and the improvement effects of each scheme were compared and analyzed.The results show that overall,the track bed slab arches within a range of 10 m from the center of the end beam on the roadbed side,and the maximum position of the arch is about 3 m from the center of the end beam.As the interlayer tensile and shear strength increase,the maximum vertical displacement of the track bed slab shows a non-linear decreasing trend,and interlayer bonding significantly suppresses the upward arch deformation of the track bed slab.The influence of interlayer friction coefficient,support layer,graded crushed stone,and AB group filler on the lateral support stiffness of the end beam and the deformation of the arch on the track bed slab is relatively small.Planting reinforcement within a range of 20 m from the end beam has less restriction on the deformation of the arch on the track bed slab.Increasing the reinforcement planting within a range of 10 m from the end beam on the subgrade side can significantly reduce the deformation of the arch on the track bed slab.

关 键 词：高速铁路 路桥过渡段 双块式无砟轨道 道床板垂向位移 影响规律 植筋方案 

分 类 号：U216.4[交通运输工程—道路与铁道工程]