多年冻土区铁路运营初期路基工程状态研究

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Abstract Research purposes: Studies on the status of subgrade engineering in permafrost region is complicated by the intervention of temperature and water and railway operating conditions． Based on in － site investigation and monitoring during the early operation of the QTR，this paper studied the status of subgrade engineering from three aspects，subgrade deformation，geothermal changes and hydrothermal conditions，and proposed solutions to subgrade cracks to ensure railway safety and conservation．

Research conclusions: ( 1) During the Early Operation，the subgrade engineering in Permafrost Region Railway，we found that the overall deformation has been on the decline and subgrade deformation has stabilized． ( 2) The upper limits of permafrost in most subgrade sections have increased，their statuses have stabilized and the cold reserves of bases have increased． The increase in upper limits is a result of the decrease in soil temperature． ( 3 ) The status of subgrade engineering has changed because the changes in geothermal field have altered the places and soil depths of deformations． At the same time，the asymmetry field causes deformation differences and deduces cracks． Hydrothermal changes will result in cracks． ( 4) Asymmetry thermotics in subgrade structure will soften the asymmetry of upper limits，thus reduce the difference of horizontal deformations and prevent cracks．

Key words： permafrost railway operation subgrade engineering

Received: 31 May 2011

PACS:	U216． 4l +6
	T752

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2012/V29/I5/14

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