[1]罗强,谢宏伟,李安洪,等.无砟轨道底座板离缝对路桥过渡段动力学性能影响分析[J].高速铁路技术,2021,12(02):33-38,49.[doi:10.12098/j.issn.1674-8247.2021.02.006]
　LUO Qiang,XIE Hongwei,LI Anhong,et al.Analysis on the Impact of Ballastless Track Base Slab Disjoint on the Dynamic Performance of Subgrade-bridge Transition Section[J].HIGH SPEED RAILWAY TECHNOLOGY,2021,12(02):33-38,49.[doi:10.12098/j.issn.1674-8247.2021.02.006]
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无砟轨道底座板离缝对路桥过渡段动力学性能影响分析()
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《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]

卷:
12卷
期数:
2021年02期
页码:
33-38,49
栏目:
出版日期:
2021-04-28

文章信息/Info

Title:
Analysis on the Impact of Ballastless Track Base Slab Disjoint on the Dynamic Performance of Subgrade-bridge Transition Section
文章编号:
1674—8247(2021)01—0033-06
作者:
罗强;  谢宏伟;  李安洪;  张良;  王腾飞
1. 西南交通大学, 成都 610031;
2. 中铁二院工程集团有限责任公司, 成都 610031;
3. 高速铁路线路工程教育部重点实验室, 成都 610031
Author(s):
LUO Qiang;  XIE Hongwei;  LI Anhong;  ZHANG Liang;  WANG Tengfei
1. Southwest Jiaotong University, Chengdu 610031, China;
2. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China;
3. Key Laboratory of High-speed Railway Engineering, Ministry of Education, Chengdu 610031, China
关键词:
路桥过渡段|差异沉降|底座板-路基离缝|动力学性能评价|控制限值
Keywords:
subgrade-bridge transition section|differential settlement|base slab-subgrade disjoint|dynamic performance evaluation|control limit
分类号:
U213.1
DOI:
10.12098/j.issn.1674-8247.2021.02.006
文献标志码:
A
摘要:
桥台背路基面工后沉落导致无砟轨道底座板出现局部离缝甚至翻浆，是既有高速铁路无砟轨道过渡段典型病害现象。针对路桥过渡段线路结构及不平顺特点，构建了支承刚度和差异变形沿纵向变化的动力学分析模型；运用车辆-轨道-路基耦合动力学理论，分析了路基与桥台交界处工后差异沉降引起的无砟轨道板底座离缝，对车体垂向加速度、轮载力及减载率、钢轨与底座板动位移及路基面动应力等关键指标的影响，讨论了在桥台背设置钢筋混凝土过渡搭板的改善效应。研究表明：（1）400 km/h设计速度条件下，过渡段动力学性能指标随桥台背路基面工后沉落呈非线性劣化趋势，依据高速铁路无砟轨道与路基结构的动态验收技术标准，路桥交界处差异沉降应控制在2~3 mm以内；（2）在过渡段的台背铺设刚性搭板，可有效改善无砟轨道板底支承条件，显著降低动力响应指标幅值，克服现行设计规范容许5 mm差异沉降的不利影响。
Abstract:
The post-construction settlement of subgrade surface of abutment back causes local disjoint and even frost boiling of ballastless track base slab, which is a typical type of defect in the transition section of existing high-speed railway ballastless track. According to the track structure and irregularity characteristics of the subgrade-bridge transition section, a dynamic analysis model for the change of bearing stiffness and differential deformation along the longitudinal direction is constructed; based on the vehicle-track-subgrade coupling dynamic theory, the impact of the base slab disjoint of the ballastless track slab caused by the post-construction differential settlement at the junction of subgrade and abutment on the key indicators such as vertical acceleration of carbody, wheel load and reduction rate of wheel load, dynamic displacement between rail and base slab, and dynamic stress on subgrade surface is analyzed, and the improvement effect of setting reinforced concrete transition slab at the abutment back is discussed. The research shows that:(1) Under the design speed of 400 km/h, the dynamic performance indicators of the transition section presents a nonlinear deterioration trend with the post-construction settlement of the subgrade surface of the abutment back, and the differential settlement at the junction of subgrade and bridge shall be controlled within 2~3 mm according to the dynamic acceptance technical standard of high-speed railway ballastless track and subgrade structure; (2) Laying a rigid transition slab at the abutment back of the transition section can effectively improve the supporting condition at the base slab of the ballastless track, significantly reduce the amplitude of dynamic response indicators, and overcome the adverse effect of 5mm differential settlement allowed in the current design code.

备注/Memo

备注/Memo:
作者简介:罗强(1963-),男,教授,博士。基金项目:四川省科技计划项目（2021YJ0001），中铁二院工程集团有限责任公司科技发展计划项目（KSNQ202060）引文格式:罗强, 谢宏伟, 李安洪, 等. 无砟轨道底座板离缝对路桥过渡段动力学性能影响分析[J]. 高速铁路技术,2021,12(2):33-38,49.LUO Qiang, XIE Hongwei, LI Anhong, et al. Analysis on the Impact of Ballastless Track Base Slab Disjoint on the Dynamic Performance of Subgrade-bridge Transition Section[J]. High Speed Railway Technology, 2021, 12(2):33-38,49.
更新日期/Last Update: 2021-04-28