米轨轨枕不同部位横向阻力分担比的数值模拟  

Numerical Simulation of Lateral Resistance Sharing Ratio of Different Parts of Meter Gauge Sleeper

作　　者：韦凯[1] 蔡元辉 谢梦[1] 尤睿 王平[1] WEI Kai;CAI Yuanhui;XIE Meng;YOU Rui;WANG Ping(MOE key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,成都610031

出　　处：《铁道工程学报》2022年第11期38-42,93,共6页Journal of Railway Engineering Society

基　　金：国家自然科学基金面上项目(51978583);四川省科技支撑项目(2021YFSY0061);四川省青年科技创新研究团队项目(2022JDTD0015)。

摘　　要：研究目的:为了研究米轨混凝土枕和钢枕横向阻力分担情况,本文采用离散元法分别建立米轨混凝土枕和钢枕有砟道床模型,并通过单根轨枕横向阻力试验验证离散元模型的正确性,进一步研究米轨混凝土枕、钢枕横向阻力分担比例。同时在离散元模型不同部位建立测量圆监测道砟孔隙率,探究轨枕横向移动过程中不同部位道砟密实度变化规律。研究结论:(1)米轨混凝土枕枕端和枕底提供了约79%的道床横向阻力,与道砟颗粒接触面大的轨枕侧面道床阻力占比较小,可以采用密实和部分胶结等方式使枕心道砟充分参与作用;(2)米轨钢枕枕端提供了约60%的道床横向阻力,枕底提供了约30%的道床横向阻力;(3)米轨混凝土枕道床横向阻力主要来源于轨枕与底部道砟颗粒的摩擦作用和砟肩道砟的压力作用,而米轨钢枕道床横向阻力主要来源于枕腔内部道砟的挤压摩擦作用和砟肩部位道砟的压力作用;(4)本文结论可为米轨无缝线路的设计和养护维修提供参考和借鉴。Research purposes: In order to study the lateral resistance sharing of meter gauge concrete sleeper and steel sleeper, the discrete element method is used to establish the ballast bed models of meter gauge concrete sleeper and steel sleeper respectively. The correctness of the discrete element model is verified by the lateral resistance test of a single sleeper, and the lateral resistance sharing ratio of meter gauge concrete sleeper and steel sleeper is further studied. At the same time, the measurement circle is set up in different parts of the discrete element model to monitor the ballast porosity, and the change law of ballast compactness is explored in different parts during the lateral movement of the sleeper.Research conclusions:(1) The end and bottom of the meter gauge concrete sleepers provide about 79% of the lateral resistance of the track bed, while the resistance of the side track bed of the sleepers with large contact surface with the ballast particles accounts for less, so the sleeper ballasts can fully participate in the action by means of compaction and partial cementation.(2) About 60% of the lateral resistance of the track bed is provided by the end of the meter gauge steel sleeper, and about 30% of the lateral resistance of the track bed is provided by the bottom of the sleeper.(3)The lateral resistance of the meter gauge concrete sleeper track bed mainly comes from the friction between the sleeper and the bottom ballast particles and the pressure of the ballast shoulder. The lateral resistance of the meter gauge steel sleeper track bed mainly comes from the extrusion friction of the ballast in the sleeper cavity and the pressure of the ballast at the ballast shoulder.(4)The research conclusion can provide reference for the design and maintenance of meter gauge CWR.

关 键 词：米轨铁路 离散元 道床横向阻力 道砟密实度 

分 类 号：U211.1[交通运输工程—道路与铁道工程]