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冰川冻土  2014 

严寒地区高速铁路路基冻胀变形监测分析

DOI: 10.7522/j.issn.1000-0240.2014.0044, PP. 360-368

Keywords: 高速铁路,季节冻土,路基,冻胀,变形监测

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Abstract:

穿越我国东北地区的哈尔滨至大连高速铁路(哈大高铁)是世界上首条投入运营的新建严寒地区高速铁路,路基冻胀防治采用了换填材料、防水等综合措施.为评价冻胀防治效果及路基工程运营状况,通过对哈大高铁开通后首个冻融期(2012-2013年度)路基全线9641个凸台观测点水准人工监测数据综合分析,研究路基冻胀变形发生、发展和变化规律.结果表明哈大高铁路基冻胀变形包括冻胀快速发展期、冻胀稳定发展期和融化回落期3个阶段,路基普遍发生冻胀但变形处于可控状态;路基的冻胀变形以基床表层冻胀为主,且其程度与路基结构有关;整体上全线过渡段冻胀轻微,路堤次之,路堑和底座板接缝处较为严重.建议后续冻胀整治应以减少路基表水下渗、控制基床表层冻胀变形为重点;类似工程设计中,应增加以桥代路段落,将路基表层改性为不冻胀整体结构.

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