直线与曲线地段无砟轨道SCC灌注对比分析
Comparative Analysis on SCC Pouring of Ballastless Track in Straight and Curved Sections
查本怡 1孙洪斌 2张浩楠 3姜金凤 4赵光 5王晓宇6
作者信息
- 1. 中铁大桥局集团第二工程有限公司,江苏南京 210015
- 2. 山东铁路投资控股集团有限公司,山东济南 250102
- 3. 北京交通大学土木建筑工程学院,北京 100044
- 4. 山东铁路投资控股集团有限公司,山东济南 250102;北京交通大学土木建筑工程学院,北京 100044
- 5. 中铁十局集团有限公司青岛分公司,山东青岛 266000
- 6. 中铁四局集团有限公司第八工程分公司,安徽合肥 230009
- 折叠
摘要
针对自密实混凝土(Self-Compacting Concrete,SCC)灌注中出现的轨道板上浮、扣压装置受力过大的问题,基于耦合的欧拉-拉格朗日(Coupled Eulerian-Lagrangian,CEL)方法,分别建立直线与曲线地段CRTS Ⅲ型板式无砟轨道SCC灌注的流固耦合模型,从理论上对比分析直线与曲线地段SCC灌注的轨道板和扣压装置力学特性.研究结果表明:轨道板上浮力、轨道板最大垂向及横向位移、拉杆轴向力均随着漏斗高度或漏斗数量的增大而增大,曲线地段的轨道板上浮力、轨道板最大垂向位移、拉杆力随漏斗高度变化更显著.单孔灌注时,曲线地段轨道板上浮力、轨道板最大垂向位移、拉杆轴向力均小于直线地段;双孔灌注时,则大于直线地段.曲线地段轨道板最大横向位移显著大于直线地段,其主要原因为曲线地段的轨道板上浮力的水平分量对轨道板在横向产生推动作用.曲线地段的内侧拉杆轴向力显著大于外侧.
Abstract
In view of the problems of floating of track slab and excessive stress on fastening device during self-compacting concrete(SCC)pouring,based on the Coupled Eulerian-Lagrangian(CEL)method,this paper establishes fluid-solid coupling models for SCC pouring of CRTS Ⅲ slab ballastless track in straight and curved sections respectively,and compares and analyzes the mechanical characteristics of track slab and fastening device during SCC pouring in straight and curved sections theoretically.The study results indicate that the floating force of track slab,the maximum vertical and lateral displacements of track slab and the axial force of toggle arm increase with the increase of hopper height or the number of hoppers.The floating force of track slab,the maximum vertical displacement of track slab and the axial force of toggle arm in curved section change more significantly with the increase of hopper height.During single-hole grouting,the floating force of track slab,the maximum vertical displacement of track slab and the axial force of toggle arm in curved section are less than those in straight section;during double-hole grouting,they are greater than those in straight section.The maximum lateral displacement of track slab in curved section is significantly greater than that in straight section.This is mainly because the horizontal component of the floating force of track slab in curved section exerts a pushing effect on the track slab in the lateral direction.The axial force of inner toggle arm in curved section is significantly greater than that of outer toggle arm.
关键词
无砟轨道/自密实混凝土/曲线地段/CEL方法/轨道板/扣压装置Key words
ballastless track/self-compacting concrete/curved section/CEL method/track slab/fastening device引用本文复制引用
基金项目
国家自然科学基金资质项目(52378214)
山东省交通运输厅科技计划项目(2021B100-1)
出版年
2024
NETL
NSTL
万方数据