寒区高速铁路路基混凝土基床试验研究
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摘要
针对季节性冻土区高速铁路路基冻胀引起的线路平顺性问题,京沈(北京—沈阳)客运专线采用了混凝土基床结构设计,在基床范围内使用混凝土代替A,B组填料。通过监测路基混凝土基床的地温、冻结深度及分层变形发展情况,分析变形对高速铁路行车线路平顺性的影响。结果表明:混凝土基床路基最大变形在2. 5 mm以内,变形较小,符合高速铁路对线路平顺性的要求。
Aiming at the line smoothness problem caused by frost-heaving of high speed railway subgrade in seasonal frozen soil region,the design of concrete subgrade bed structure was adopted in Beijing-Shenyang passenger dedicated line,and the concrete was used to replace the A,B group filling within the range of subgrade bed. By monitoring the development of ground temperature,frozen depth and layered deformation of concrete subgrade bed,the influence of deformation on the line smoothness of high speed railway was analyzed. The results showthat the maximum deformation of concrete subgrade bed is less than 2. 5 mm and the deformation is small,which could meet the requirement ofline smoothness for high speed railway.
Aiming at the line smoothness problem caused by frost-heaving of high speed railway subgrade in seasonal frozen soil region,the design of concrete subgrade bed structure was adopted in Beijing-Shenyang passenger dedicated line,and the concrete was used to replace the A,B group filling within the range of subgrade bed. By monitoring the development of ground temperature,frozen depth and layered deformation of concrete subgrade bed,the influence of deformation on the line smoothness of high speed railway was analyzed. The results showthat the maximum deformation of concrete subgrade bed is less than 2. 5 mm and the deformation is small,which could meet the requirement ofline smoothness for high speed railway.
引文
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[2]闫宏业,蔡德钩,张千里,等.铁路路基冻害防治保温技术研究[J].铁道建筑,2015,55(1):51-55.
[3]陈则连,冷景岩.哈齐客运专线路基冻胀变形研究[J].路基工程,2014,32(6):131-134.
[4]王春雷,张戎垦,赵晓萌,等.季节冻土区高速铁路路基冻胀监测系统及冻胀规律研究[J].冰川冻土,2014,36(4):962-968.
[5]聂志红,刘源,王翔.客运专线基床表层级配碎石冻胀影响因素的试验研究[J].铁道科学与工程学报,2013,10(4):59-62.
[6]毛永志.浅谈高铁防冻胀混凝土基床伸缩缝施工技术[J].价值工程,2016,35(24):133-134.
[7]杨西锋.高纬度严寒地区高速铁路路基防冻胀设计研究[J].铁道标准设计,2014,58(8):6-12.
[8]杨波.寒冷地区普速铁路路基冻胀特征及维护对策[J].铁道建筑,2017,57(7):97-99.
[9]田士军.哈大高铁路基用掺水泥级配碎石冻胀特性试验研究[J].铁道建筑,2014,54(8):79-82.