大西高速铁路季节性冻土区路基冻害成因及整治措施

Causes of Frost Heaving of Subgrade in Seasonal Frosted Sections of Datong-Xi'an HSR & Solutions

以大(同)西(安)高速铁路高速综合试验段为例,对季节性冻土区路基冻害主要成因、整治措施及其效果进行研究。针对高速综合试验段路基含水量高、细颗粒含量大、所处区域长期低温而导致路基出现冻胀进行分析,采用封闭轨面渗水裂缝、清理电缆槽泄水孔、增设基床表层排水孔和基床底层排水盲沟等措施进行整治。分析对比病害整治区段同一位置的年度最大冻高数据,证明提出的路基冻害整治措施可行并有效。

This paper takes the Comprehensive HS Test Section of Datong-Xi＇an HSR as an example and looks into the main causes of frost heaving of subgrade in seasonal frosted sections and solutions of the problem. Given the fact that the high water content and high fine particle content in the comprehensive HS test section and the long-term low temperature in the area lead to the frost heave of the subg^de, this article proposes solutions such as sealing water leaking cracks on the rail surface, cleaning the drainage openings in cable trough and opening drainage holes on the surface of the subgrade bed and blind ditches of drainage on the bottom layer of subgrade. It also compares the maximum height of frost heave in one year at a location in the section with that of another, and confirms that the solutions put forward in the paper are workable and effective.