摘要
为解决高速铁路悬臂U形路基结构型式优化问题,确定更为合理、可靠的悬臂U形路基结构型式,采用结构力学分析和弹性地基梁理论,开展趾板长度、侧壁板高度、倾角及截面形式等因素对悬臂U形路基承载性能影响规律分析,提出关键性控制指标的确定方法,为悬臂U形路基结构优化设计和工程应用推广奠定基础。分析结果表明:相较于传统放坡式路基,悬臂U形路基占地面积减小约60%,尤其适用于场地狭小、征地相对困难地段;墙趾长度是影响悬臂U形路基底板内力和变形的关键性指标,优化设计中的墙趾板长度应使底板同悬挑路肩等宽;侧壁板角度同槽内填土土压力大小和分布直接相关,设计中宜采用内表面直立、外表面倾斜、高度不超过6 m的变截面侧壁板。
In order to systematically solve the type optimization problem of a more reasonable and reliable cantilever U-shaped subgrade,structural mechanics analysis and elastic foundation beam theory are used to analyze the influence of toe board length,the angle,the height and the section form of the side wall on the bearing performance,and key control indexes determination method is proposed,which lays a foundation for optimal design and engineering application of cantilever U-shaped subgrade structure.Analysis results show that the cantilever U-shaped subgrade reduces its floor area by some 60%,which is especially suitable for the narrow or difficult land acquisition section.Toe board length is the key index affecting the foundation internal force and deformation,and should be such that the bottom plate is equal to the overhanging shoulder in width.Side wall angle is directly related to the soil pressure value and the distribution,and the variable cross-section and lower than 6 m high side wall with upright inner surface and inclined outer surface should be used in optimization design.
作者
郭帅杰
GUO Shuaijie(China Railway Design Corporation,Tianjin 300308,China;National-Local Joint Engineering Laboratory of Rail Transit Survey&Design,Tianjin 300308,China;National Engineering Laboratory for Digital Construction and Evaluation Technology of Urban Rail Transit,Tianjin 300308,China)
出处
《铁道标准设计》
北大核心
2023年第5期31-36,共6页
Railway Standard Design
基金
中国铁路设计集团有限公司科技开发计划项目(2019YY-222101、2020YY241004)
中国科协铁路青年人才托举工程项目(2019QNRC001)。
关键词
高速铁路
铁路路基
U形路基
土压力
趾板
优化分析
high-speed railway
railway subgrade
U-shaped subgrade
soil pressure
toe board
optimization analysis
