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.
引文
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