多年冻土区道路排水渠道病害的防治现场试验  

Field Test on Damage Prevention Measures of Road Drainage Canal in Permafrost Regions

作　　者：田亚护 房建宏[1] 许国琪[3] 

机构地区：[1]青海省交通科学研究所,西宁810008 [2]北京交通大学土木建筑工程学院,北京100044 [3]青藏铁路公司工务部,西宁810007

出　　处：《防灾减灾工程学报》2013年第S1期99-104,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：多年冻土地区公路建设与养护技术交通行业重点实验室青海研究观测基地开放基金项目(20121208);国家自然科学基金项目(412710720);中央高校基本科研业务费专项资金(2011JBZ009)资助

摘　　要：通过现场调查,青藏高原多年冻土区路基排水渠道的病害类型主要表现为渠道底部的错裂变形和渠道侧向水平方向的裂缝;排水渠道病害主要是由渠道地基土体往复的不均匀冻胀融沉变形及渠道两侧土体冻胀后产生的垂直水平冻胀力的作用所致。根据青藏高原多年冻土区排水渠道病害产生的机理,在进行多年冻土区路基排水渠道的病害防治措施设计时,应主要从适应渠道地基土体的不均匀冻胀和融沉变形、减弱水平冻胀力两方面考虑。新型结构排水渠道两年的现场试验结果表明,该结构形式的排水渠道实际效果较好,用于多年冻土区道路工程中可以延长养护周期、降低维修费用。On the basis of site investigation,the main damage types of road drainage canals in permafrost regions of Tibetan Plateau are analyzed.The damage includes relative shifts occurred in the bottom of drainage canals and lateral horizontal cracks.These diseases are mainly caused by repeatedly uneven frost heaving and thawing settlement of the foundation and vertical frost heaving force resulted from freezing of soil at canal′s wall.According to mechanism of these diseases, the design methods of prevention measures should take into account two aspects,namely reducing uneven frost heaving and thawing settlement of the foundation,and weakening horizontal frost heaving force.A new structural drainage system is designed in this paper,and its practical effect is good undergoing two years.Its maintenance period can prolong and maintenance costs can also reduce when the new structure of drainage canal is used for embankment engineering in permafrost regions.

关 键 词：多年冻区 排水渠道 路基工程 冻胀融沉 

分 类 号：S276[农业科学—农业水土工程]