青藏铁路典型地段变形特征分析

冻土区路基变形问题的核心就是研究路基内地温的变化.通过分析青藏铁路典型地段气温地温均低、气温高地温低、气温地温均高3种不同地段在工程热扰动阶段、路基趋于稳定阶段、铁路长期运营阶段的地温变形原始资料,得到相应地段在不同时期的地温和变形特征.分析结果表明,气温、地温均高地段路基抵御未来气温升高的能量积累不足,产生的沉降变形量最大,因此必须采用相应的工程措施.

Deformation Analysis of Typical Embankment of Qinghai-Tibet Railway

The key to valuate deformation of embankment is to study its group temperature field.By analyzing the information of temperature and deformation of embankments in the three different areas,that is,low air and low ground temperature,high air and low ground temperature,and high air and high ground temperature in three different steps which are named thermal disturbance time,thermal stabilizing time,and operation time,respectively,the characteristics of temperature and deformation are found in the homologous area.The results indicate that stability to resisting the growing air temperature is poor and deformation is relatively large in high air and high ground temperature area,therefore,corresponding measures should be adopted.