高速铁路岩溶路基段桩板结构沉降变形分析  

Settlement and Deformation Analysis of Pile Slab Structure in Karst Roadbed Section of High-Speed Railway

作　　者：唐宏华 TANG Honghua(China Railway 24th Bureau Group Corporation Limited,Shanghai 200433,China)

机构地区：[1]中铁二十四局集团有限公司,上海200433

出　　处：《铁道建筑技术》2023年第10期209-212,共4页Railway Construction Technology

基　　金：中铁二十四局集团有限公司科技研发项目(科研2018-05)。

摘　　要：以新建某高速铁路岩溶路基段为研究背景,基于通用有限元分析软件,将土体简化为Mohr-Coulomb弹塑性模型,建立岩溶地段桩板结构有限元模型。采用生死单元对桩土进行地应力平衡,将集中荷载作用于模型上,研究集中荷载和摩擦系数对桩板结构沉降影响规律。结果表明,摩擦系数不变,所施加集中荷载越大,桩板结构沉降越大;集中荷载不变,改变桩土间摩擦系数,随摩擦系数增大,桩板结构沉降越来越小。数据显示,集中荷载达到5 000 kN时,桩板结构沉降值趋于稳定(小于1.5 mm),验证了桩板结构设计的合理性和有效性。Taking the karst roadbed section of a newly-built high-speed railway as the research background,this paper simplified the soil mass into Mohr-Coulomb elasto-plastic model based on general finite element analysis software,and established the finite element model of pile plate structure in karst section.Then,using the model change to balance the crustal stress of pile and soil,the concentrated load was applied to the model to analyze the influence law of concentrated load and friction coefficient on the settlement of pile plate structure.The results show that,under the condition of constant friction coefficient,the greater the concentrated load is applied,the greater the settlement of pile plate structure is,and the friction coefficient between pile and soil is changed when the concentrated load is unchanged.With the increase of the friction coefficient between pile and soil,the settlement of pile-plate structure becomes smaller and smaller.The data show that when the concentrated load reaches 5000 kN,the settlement of the pile-plate structure tends to be stable(less than 1.5 mm),which demonstrates the rationality and effectiveness of the pile-plate structure design.

关 键 词：岩溶地段 桩板结构 地应力平衡 沉降 数值分析 

分 类 号：U213.1[交通运输工程—道路与铁道工程] U238