大西客运专线路基冻胀监测与分析  

Monitoring Technology of Subgrade Frost Heaving for Datong-Xi'an Passenger Dedicated Railway

作　　者：刘海江 

机构地区：[1]大西铁路客运专线有限责任公司,山西太原030027

出　　处：《铁道建筑》2016年第8期108-111,共4页Railway Engineering

摘　　要：高速铁路对轨道的平顺性要求高,路基冻胀产生的不均匀变形会传递给轨道,影响列车运行安全性与舒适度。大西客运专线原平—运城段属于寒冷地区,为了控制该段路基冻胀变形,采取了不同的冻胀控制措施,并选择了4段典型段落开展了冻胀监测。经过一个冻融周期监测发现:冻融循环周期内地温发展变化大致可以分为快速降温、慢速降温和升温3个阶段;绝大部分测试的最大冻结深度小于设计的最大冻结深度;基床底层采用A,B组填料的路堤工点的最大冻胀变形略小于基床底层采用改良土的路堑工点;冻胀变形均<8 mm,冻胀变形主要集中在≤4 mm范围内,说明防冻胀措施是有效的。High speed railway raises the requirement for track regularity,as the frost heaving of the subgrade results in the irregularity of track,therefore undermines operational safety and passenger comfort. Given that the Yuanping-Yuncheng section on Datong-Xi＇an railway locates in cold area,the paper takes it as the study objects and adopts different approaches of frost heaving control to mitigate the hazard induced. Afterwards, it puts 4 sections under a complete cycle of frost heaving monitor. The results indicated that in terms of the development of ground temperature,the freezing-thawing cycle could be generally divided into three stages,namely the stage of temperature slump,that of temperature decrease and that of temperature rise. In most cases,the maximum freezing depths fell below the designed depth obtained. At the same time,the frost heaving deformation occurred at the sampled points at the embankment,where set A and set B fillings were applied to the bottom layer of the subgrade,fell behind that occurred at the cut points-where improved soil was applied to the bottom layer-by a small margin,yet both stood below 8 mm. Given that most data collected stood at or below 4 mm, it could be said that the measures were effective.

关 键 词：客运专线 路基冻胀 监测 冻结深度 冻胀变形 

分 类 号：U213.14[交通运输工程—道路与铁道工程]