高聚物抬升无砟轨道服役期沉降研究  

Study on the Settlement of High Polymer Uplift Ballastless Track During Service Period

作　　者：毛建红 MAO Jian-hong(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《工程建设与设计》2020年第24期77-78,122,共3页Construction & Design for Engineering

摘　　要：对沉降后的路基基床表层进行高聚物注浆抬升后,轨道还将长期服役,轨道结构在服役期间必须满足TB 10621—2014《高速铁路设计规范》中对于沉降量的要求。论文推导了适用于高聚物层的循环荷载轴向应变公式,求出不同荷载、不同时间下的变形;利用三维有限差分法动力学模型计算出修复后轨道的内力,采用分层总和法求出轨面沉降。研究表明:随着时间的增加,路基表层轨道中轴线处的沉降量皆大于钢轨处。运行速度小于350km/h时,沉降速度小于规范要求的每年沉降3cm/a。The track will be in service for a long time and must meet the requirement of settlement in the Design Code of High-Speed Railway(TB 10621—2014), after high polymer grouting was carried out on the subgrade bed surface. In this paper, the cyclic axial strain formula of polymer layer was deduced, and the deformation under different load and time was obtained. The internal force of the repaired orbit was calculated by the three dimensional finite difference method, and the settlement was calculated by stratified summation method.The results show that the amount of settlement at the central axis of the subgrade track is greater than that at the rail with time increased.When the running speed is less than 350 km/h, the settlement speed is less than the annual settlement of 3 cm per year required by the design code.

关 键 词：无砟轨道注浆抬升 伯格斯模型 有限差分法 路基沉降 

分 类 号：U213[交通运输工程—道路与铁道工程]