重载列车荷载作用下路基夹层现象的分析
The phenomenon of subgrade interlayer under heavy-haul train load
丁瑜 1贾羽 2王晅 3宗钟凌 1张家生3
作者信息
- 1. 江苏海洋大学土木与港海工程学院,江苏 连云港 222002;江苏省海洋工程基础设施智能建造工程研究中心,江苏 连云港 222002
- 2. 中南大学土木工程学院,湖南 长沙 410083
- 3. 中南大学土木工程学院,湖南 长沙 410083;高速铁路建造技术国家工程研究中心,湖南 长沙 410083
- 折叠
摘要
重载列车荷载作用下路基夹层、道砟囊、翻浆冒泥等路基病害频发,严重影响了列车的安全运行.为分析重载列车荷载作用下路基夹层现象,采用自制试样筒对路基土(粉质黏土)和道砟进行循环加载试验,分析重载列车荷载作用下试样变形特性及路基夹层的产生与发展过程;进而提出路基夹层的两个主要表征指标,即路基夹层厚度和细颗粒迁移质量.结果表明:1)重载列车荷载作用下,试样的轴向变形呈非线性增大的趋势;路基夹层在加载初期较为明显,加载后期路基夹层的变化不明显.2)采用路基夹层厚度及细颗粒迁移质量这两个指标对路基夹层特性进行表征,路基夹层厚度、细颗粒迁移质量与路基土体初始干密度近似呈线性负相关关系,与循环荷载幅值近似呈线性正相关关系,而加载频率对路基夹层厚度和细颗粒迁移质量的影响相对较小.
Abstract
Problems of subgrade interlayer,ballast pockets,and mud pumping frequently occur under heavy-haul train loads,which seriously affect the safe operation of trains.To investigate the phenome-non of subgrade interlayer under heavy-haul train load,the cyclic loading tests of subgrade soil(silty clay)and ballast were carried out by a self-developed test apparatus,the deformation characteristics of the sample and the development of subgrade interlayer under the heavy-haul train load were analyzed.Furthermore,two characterizing indexes of subgrade interlayer,thickness of subgrade interlayer and migration quality of fine particles,were proposed.The results show that:1)the axial deformation of the sample increases nonlinearly with the increase of loading times under heavy-haul load.The develop-ment of subgrade interlayer is obvious in the initial stage of loading,but not noticeable in the later stage of loading.2)The thickness of the subgrade interlayer and the migration quality of fine particles can be used to characterize the features of the subgrade interlayer.The thickness of the subgrade inter-layer and migration quality of fine particles are negatively correlated with the initial dry density of sub-grade soil,and positively correlated with cyclic loading amplitude.The influence of loading frequency on the thickness of the subgrade interlayer and the migration quality of fine particles is relatively small.
关键词
重载列车/路基夹层/轴向变形/路基夹层厚度/细颗粒迁移质量Key words
heavy-haul railway/subgrade interlayer/axial deformation/thickness of subgrade inter-layer/migration quality of fine particles引用本文复制引用
基金项目
国家自然科学基金(51978674)
中国国家铁路集团有限公司科技研发计划(L2022G002)
江苏省高等学校大学生创新创业训练计划(202311641122Y)
出版年
2024
国家科技期刊平台
NSTL
万方数据