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浙江大学学报(工学版)
浙江大学学报(工学版)  2024, Vol. 58 Issue (11): 2364-2375    DOI: 10.3785/j.issn.1008-973X.2024.11.018
土木工程、交通工程     
浸水对重载铁路加筋路基动力特性的影响
李丽华1,2(),江曙光1,2,梅利芳1,2,*(),刘一鸣1,2
1. 湖北工业大学 土木建筑与环境学院，湖北 武汉 430068
2. 河湖健康感知与生态修复教育部重点实验室，湖北 武汉 430068
Influence of water immersion on dynamic characteristics of heavy-haul railway reinforced subgrade
Lihua LI1,2(),Shuguang JIANG1,2,Lifang MEI1,2,*(),Yiming LIU1,2
1. School of Civil Engineering, Architecture and the Environment, Hubei University of Technology, Wuhan 430068 , China
2. Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake, Ministry of Education, Wuhan 430068, China
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摘要：

为了解决重载铁路路基湿化后路基性能下降，影响列车行车安全的问题，通过室内模型实验模拟不同轴重列车动载作用，研究浸水前、后重载铁路加筋路基的动力特性及长期稳定性. 结果表明，浸水后素土路基的应力、沉降、加速度会显著增大；浸水后与素土路基相比，格室加筋后路基最大应力下降21%，轨枕沉降下降20%，复合加筋路基的最大应力下降23%，轨枕沉降下降30%，复合加筋效能优于格室加筋. 加筋可以提高路基强度，使路基的上部结构更稳定，降低路基加速度. 浸水后路基各层的应力衰减系数增大，加筋使应力衰减系数和应力竖向扩散深度减小. 加筋可以降低路基孔隙水压力峰值，提高孔隙水压力的消散速度. 浸水后土工布可以保持道砟层性能，减轻道砟污化.
关键词： 浸水;  重载铁路;  加筋路基;  应力;  加速度;  沉降;  孔隙水压力    
Abstract:

The dynamic load effect of different axle heavy train was simulated by indoor model experiment in order to solve the problem that the roadbed performance of heavy haul railway decreased after wetting, which affected the safety of train running. The dynamic characteristics and long-term stability of reinforced roadbed of heavy haul railway before and after soaking were analyzed. Results show that the stress, settlement and acceleration of the plain soil roadbed increase significantly after soaking. The maximum stress and the settlement of sleeper decrease by 21% and 20% respectively, the maximum stress of composite reinforced roadbed decreases by 23% , and the settlement of sleeper decreases by 30%. The reinforcement can improve the strength of subgrade, make the superstructure of subgrade more stable and reduce the acceleration of subgrade. The stress attenuation coefficient of each layer of roadbed increases after soaking, and the reinforcement makes the stress attenuation coefficient and the stress vertical diffusion depth decrease. The reinforcement can reduce the peak value of pore water pressure and increase the dissipation rate of pore water pressure. Geotextile can keep the properties of ballast layer and reduce the fouling of ballast layer after soaking.
Key words: water immersion    heavy-loaded railway    reinforced subgrade    stress    acceleration    settlement    pore water pressure
收稿日期: 2023-09-14 出版日期: 2024-10-23
CLC:  TU 239  
基金资助: 国家自然科学基金资助项目（52278347)；湖北省基金创新群体资助项目（2024AFA009）；湖北省高等学校优秀中青年科技创新团队资助项目（T2023006）；湖北工业大学杰出人才基金资助项目（XJ2021000501).
通讯作者: 梅利芳     E-mail: researchmailbox@163.com;meilfhg@163.com
作者简介: 李丽华（1978—），女，教授，从事加筋土、路基工程、环境岩土工程的研究. orcid.org/0000-0001-7688-5552. E-mail：researchmailbox@163.com
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引用本文:

李丽华,江曙光,梅利芳,刘一鸣. 浸水对重载铁路加筋路基动力特性的影响[J]. 浙江大学学报(工学版), 2024, 58(11): 2364-2375.

Lihua LI,Shuguang JIANG,Lifang MEI,Yiming LIU. Influence of water immersion on dynamic characteristics of heavy-haul railway reinforced subgrade. Journal of ZheJiang University (Engineering Science), 2024, 58(11): 2364-2375.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2024.11.018    或    https://www.zjujournals.com/eng/CN/Y2024/V58/I11/2364

图 1  交通荷载模型的试验系统
加筋材料成分A/（g·m?2）D/mm$ {F}_{1} $/kNL/%
无纺土工织物聚丙烯500±201≥3.230~100
表 1  土工布工程的参数
图 2  道砟级配曲线
图 3  模型及传感器布置图
图 4  加筋材料的铺设位置
T/tv/(km·h?1)$ {F}_{2} $/kN$ {F}_{3} $/kNf/Hz
23807152[17]
25801020
27801225
30801530
表 2  加载参数汇总
组别加载载重/t是否加筋是否浸水v/(km·h?1)
U依次施加23、25、27、30 t，每级5万次否否80
U-G土工格室否80
U-G-T土工格室+土工布否80
S否是80
S-G土工格室是80
S-G-T土工格室+土工布是80
表 3  列车荷载加载的试验方案
数据来源σ1/kPa
T = 23 tT = 25 tT = 27 tT = 30 t
本文缩尺模型50.855.965.584.5
Boussinesq理论解[20]—73.982.7（28t）88.6
大秦线大同-阳原段[21]—52.2——
大秦线朔黄线[22]—42.4——
表 4  路基应力峰值的对比
图 5  不同轴重下路基动应力的横向分布
图 6  不同轴重下路基各个位置沉降的横向分布
图 7  不同轴重下路基各位置加速度峰值的横向分布
图 8  不同轴重下各项数据的峰值变化
图 9  不同轴重下各路基应力的纵向分布
图 10  不同轴重下各路基动应力衰减系数
图 11  路基沉降随加载次数的变化曲线
图 12  浸水后在路基中铺设土工布前、后的对比
图 13  孔隙水压力随加载次数的变化曲线
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