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高寒地区水分场迁移对路基稳定性影响分析

ISSN号：1006-2106
期刊名称：《铁道工程学报》
时间：0
分类：U416.168[交通运输工程—道路与铁道工程]
作者机构：[1]兰州交通大学,兰州730070, [2]中铁三局集团有限公司,太原030000
相关基金：国家科技支撑计划课题（2014BAG05805）;教育部“长江学者和创新团队发展计划”课题（IRT1139）;国家自然科学基金项目（51168030）

关键词：高寒地区, 次生不良病害, 水分场迁移, 稳定性, 数值分析, alpine region, secondary disease, moisture field transfer, stability, numerical analysis

中文摘要：

研究目的：高寒地区修筑路基工程会形成次生不良病害现象,次生不良病害对铁路、公路路基等建筑物会造成各种危害。研究高寒地区不良冻土现象的形成机理和发育,对防治次生不良冻土的发生和发展,保证工程的稳定和安全有着非常重要的意义。本文通过对次生不良冻土现象中的热融滑坍和冻涨丘问题进行数值分析,并提出次生灾害的防治及工程保护措施。研究结论：对高寒地区次生不良灾害的形成机理及变化过程进行研究,得出如下结论：（1）考虑水分场迁移作用时,热融沟对路基横向不均匀变形的影响会加剧,从而形成路基纵向裂缝的病害,严重影响路基的稳定性;（2）水分场迁移的作用使温度场变化明显加剧,热融沟周围的变形加大,在水分场迁移影响下冻胀和融沉的反复作用会导致积水流入路基侧面,会威胁到路基稳定性及行车的安全,需要采取正确的工程措施进行治理;（3）本研究结论可为多年冻土地区的工程建设提供一定的理论依据,对防治次生不良冻土灾害具有参考意义。

英文摘要：

Research purposes： The construction of subgrade engineering in alpine region will form a secondary disease, secondary disease of the railway, highway subgrade and other buildings will produce a variety of hazards. It is very important to study the formation mechanism and development of the secondary unfavorable permafrost in the high altitude area to ensure the stability and safety of the project. Through the numerical analysis of thermal thaw sliding collapse and freeze up mounds of secondary unfavorable permafrost phenomenon, this paper put forward prevention and engineering protection measures of secondary disasters. Research conclusions：Through study on the formation mechanism and change process of secondary harmful disasters in alpine region, the following conclusions are drawn ：（ 1 ） Considering effects of moisture field transfer, the influence of hot melt sulcus on the lateral inhomogeneous deformation of the subgrade will increase, which will form the disease of subgrade longitudinal cracks, seriously affect the subgrade stability. （2） Moisture field transfer makes the temperature field change significantly intensify and the deformation around the hot melt sulcus increase, repeated action of frost heave and thawing settlement under the influence of moisture field transfer will cause water into the subgrade side, which will threaten the stability of subgrade and safety of train operation, so it is necessary to take correct engineering measures to governance. （3） The research result provides a theoretical basis for the engineering construction in permafrost regions,and has the reference significance to the prevention of secondary unfavorable disaster.

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