高寒阴湿区高铁路基冻害特征及整治效果分析

Freezing Damage Characteristics and Remediation Effects Analysis of High⁃speed Railway Roadbeds in Cold and Wet Areas

兰新高铁穿越祁连山南侧高寒阴湿沟谷山区,每年均发生路基冻害,严重影响线路平顺性,需调整因冻胀引起的轨面高程变化。对该区域进行实地踏勘后统计分析调查的数据,评估分析已有整治措施的效果,总结该区域路基冻害特点及成因,并分析评价现有处治措施的效果。对于易发生冻害的低路堤、浅路堑、涵洞及涵路过渡地段,建议在路堤坡脚处增设渗水盲沟,同时在涵洞内侧及路基两侧铺设保温材料,增设纵横向排水设施,以减弱因冻胀产生的破坏。

Lanzhou-Xinjiang High-speed Railway passes through the alpine and humid valley mountainous area on the south side of Qilian Mountains,the subgrade frost damage occurs every year,which seriously affects the smoothness of the line,it is necessary to adjust the rail surface elevation change caused by frost heave.After the field survey of the area,the survey data were statistically analyzed to evaluate and analyze the effect of the existing remediation measures,the characteristics and causes of subgrade frost damage in this area are summarized,and the effects of existing treatment measures are analyzed and evaluated.For low embankment,shallow cutting,culvert and culvert-road transition section prone to frost damage,it is recommended to add seepage blind ditch at the toe of embankment slope,at the same time,thermal insulation materials are laid inside the culvert and on both sides of the subgrade,and vertical and horizontal drainage facilities are added,to weaken the damage caused by frost heave.