摘要
随着列车运行向高速与重载方向发展,铁路路基沉降的控制标准日益提高。本工作通过建立有砟轨道-路基三维模型及土工格室模型,研究了道砟层和土工格室的加固作用,并通过相位荷载模拟列车动荷载,分析了列车轴重以及土工格室对道砟沉降的影响。结果显示,在正弦相位荷载作用下,各轨枕间位移变化几乎一致,证明该方法可以有效模拟列车荷载;随着列车轴重增加,道砟沉降显著增大;而土工格室加固后,道砟层竖向沉降和侧向位移分别降低约11%和60%,表明土工格室在水平约束方面表现出较好的效果。尽管在重载情况下其加固能力有所减弱,但通过调整弹性模量可以提升性能。当弹性模量处于400~800 MPa之间时,加固效果最优。研究结论为路基沉降控制提供了指导,同时为选择合适的土工格室应用于有砟轨道提供了数据支持。
Track settlement is a primary disease for ballasted railway,especially for fast and heavy haul trains.In order to study the reinforcing mechanism of geocell,the 3D finite element model of ballasted track with a geocell layer embedded in ballast layer were established by ABAQUS software,and 90°phase loading were used to simulate the cyclic load of passing train.The simulation results show that all the sleeper settlements are similar which prove the sinusoidal phase loading is acceptable to model the train load.With the increasing of the axle load,the ballast settlement increases.Meanwhile,for the reinforced condition,the lateral displacement and vertical settlement of ballast layer reduce 60%and 11%,respectively,which confirms the confinement function of the geocell.The reinforcing efficiency under the heavy load becomes smaller than that under the normal load,but it is also can be improved by modifing the geocell stiffness.The geocell stiffness of 400—800 MPa is required to achieve a good confinement under heavy load.This findinga is useful to control the track settlement,and also the application of geocell in ballasted railway.
作者
王子照
WANG Zizhao(China Railway Construction Group Co.,Ltd.,Beijing 100043,China)
出处
《材料导报》
北大核心
2025年第24期93-98,共6页
Materials Reports
基金
国家重点研发计划(2023YFC3009300)。
关键词
道床沉降
数值模拟
动荷载
土工格室
轴重
铺设方案
track settlement
numerical simulation
dynamic load
geocell
axle load
layout scheme
