铁道标准设计2018，Vol.62Issue(5)：20-25,6.DOI:10.13238/j.issn.1004-2954.201706210002
兰新高铁军马场至民乐区间路基冻害原因分析及整治措施
Cause Analysis and Treatment Measures of Subgrade Frost Damage in Junmachang to Minle Section of Lanzhou-Xinjiang High-speed Railway
摘要
Abstract
In the winter of 2014,it was found that the track regularity could not meet the train operating requirements in the section of K2 005 to K2 030 of Lanzhou-Xinjiang high-speed railway in the territory of Lanzhou Railway Bureau. The irregularity was caused by subgrade frost heave. With field investigation, experimental research and data analysis,the causes are identified and treatment measures are provided. (1) Where the bottom of roadbed is compacted with B class filler with 10.96% ~21.46% of particles less than 0.075 mm, the filler in place would generate frost heave, resulting in subgrade frost damage subject to adverse moisture and temperature. (2) In the section, surface water permeates into subgrade from slope and drain ditches, resulting in high moisture content in subgrade and constituting conditions for subgrade heave in winter when temperature drops bellow zero. (3) Due to the difference of the thermal parameters between the subgrade filler and the natural ground soil, the high altitude, low negative temperature and long duration, the subgrade freezing depth is more than 2.5 m, exceeding the standard freezing depth in this region. (4)Based on the fact that this railway is already opened for operation,seepage blind ditch, back pressure, thermal protection road, water resisting wall and other measures are employed to eliminate or reduce deformation for normal operation of the high-speed railway.关键词
兰新高铁/路基冻害/原因/细粒含量/水分/低温/整治措施Key words
Lanzhou-Xinjiang high-speed railway/Subgrade frost damage/Causes/Content of fine particle/Moisture/Low temperature/Treatment meas-ures分类
交通工程引用本文复制引用
沈鑫,朱生宪,宋小齐,杨有海..兰新高铁军马场至民乐区间路基冻害原因分析及整治措施[J].铁道标准设计,2018,62(5):20-25,6.基金项目
中国铁路总公司科技研究开发计划项目(2016G003-F) （2016G003-F）
