SCC灌注过程中轨道板变形与扣压装置受力特性分析  

Analysis on track slab deformation and clamps mechanical characteristics during SCC pouring process

作　　者：张浩楠 张艳荣[1] 吴楷 高亮[1] 张爽 丁一 ZHANG Haonan;ZHANG Yanrong;WU Kai;GAO Liang;ZHANG Shuang;DING Yi(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《北京交通大学学报》2024年第1期106-114,共9页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金(52378214);运城市揭榜挂帅项目(C22M0011)。

摘　　要：针对自密实混凝土(Self-Compacting Concrete,SCC)灌注过程中出现的轨道板上浮以及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,建立直线地段CRTSⅢ型板式无砟轨道自密实混凝土灌注过程的流固耦合模型,从理论上研究不同施工参数对自密实混凝土灌注过程的影响规律和机理,重点分析漏斗高度、漏斗数量等参数对填充率、轨道板垂向和横向位移以及扣压装置受力等关键指标的影响.研究结果表明:漏斗高度与数量的增加均会减少灌注时间、提高施工效率,且增加漏斗数量的效果更明显;单孔灌注时的轨道板最大垂向位移出现在板边中部,双孔灌注时出现在观察孔附近,而最大横向位移仅出现在扣压装置附近;增加漏斗高度导致自密实混凝土对轨道板的压强增大,因而轨道板垂向与横向位移增加,扣压装置的垂向和横向力均增大;与单孔灌注相比,双孔灌注时轨道板上浮量、横向位移以及扣压装置受力明显增大.Addressing the issues of floating of track slabs and excessive forces on clamps during the pouring process of Self-Compacting Concrete(SCC),a Coupled Eulerian-Lagrangian(CEL)method is employed.This study establishes a fluid-solid coupling model for the pouring process of SCC in the CRTSⅢslab track on straight sections.Theoretical exploration is conducted on the effects and mechanisms of various construction parameters on the SCC pouring process.A primary focus is placed on the impact of funnel height and number on filling rates,vertical and lateral displacements of track slabs,and clamps forces.Results indicate that increasing funnel height and number decreases pouring time and enhances construction efficiency,with a more pronounced effect for the latter.During singlehole pouring,the maximum vertical displacement of track slabs occurs in the middle of the slab edge,while during double-hole pouring,it is near the observation hole.Maximum lateral displacement oc⁃curs near the clamps.Greater funnel height results in higher SCC pressure on the track slabs,leading to increased vertical and lateral displacements,as well as higher clamp forces.Notably,double-hole pouring results in greater final floating and lateral displacements of track slabs,along with higher clamp forces,compared to single-hole pouring.

关 键 词：无砟轨道 数值模拟 自密实混凝土 CEL方法 漏斗高度 漏斗数量 

分 类 号：U213.2[交通运输工程—道路与铁道工程]