| 多年冻土地区路基纵向裂缝形成机理研究 |
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| 引用本文： | 裴建中,窦明健,胡长顺,王秉纲. 多年冻土地区路基纵向裂缝形成机理研究[J]. 冰川冻土, 2006, 28(1): 116-121. DOI: 10.7522/j.issn.1000-0240.2006.0016 |
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| 作者姓名： | 裴建中 窦明健 胡长顺 王秉纲 |
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| 作者单位： | 长安大学, 特殊地区公路工程教育部重点实验室, 陕西, 西安, 710064 |
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| 基金项目： | 国家自然科学基金项目(50178010)资助 |
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| 摘 要： | 多年冻土地区路基纵向裂缝呈现裂缝数量多、规模大、久治不愈的特点.在野外调查纵向裂缝变形特点和多年冻土上限变化规律分析的基础上,发现导致多年冻土地区纵向裂缝产生的原因是路基边坡坡脚下存在不稳定的融化区域,并提出机理分析模型.通过弹塑性有限元分析,研究了路基中的位移、应变变化规律,提出了纵向裂缝形成过程的3个阶段:初始变形阶段、强度破坏阶段和变形失稳阶段;相应于这3个阶段,路基及地基中呈现了三个性状不同的区域:发育区、抑制区和诱发区.为纵向裂缝防治对策的提出提供了依据.
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| 关 键 词： | 多年冻土地区 路基纵向裂缝 形成机理 |
| 文章编号： | 1000-0240(2006)01-0116-06 |
| 收稿时间： | 2005-08-09 |
| 修稿时间： | 2005-10-10 |
Forming Mechanism of Embankment Longitudinal Cracks in Permafrost Regions |
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| PEI Jian-zhong,DOU Min-jian,HU Chang-shun,WANG Bin-gang. Forming Mechanism of Embankment Longitudinal Cracks in Permafrost Regions[J]. Journal of Glaciology and Geocryology, 2006, 28(1): 116-121. DOI: 10.7522/j.issn.1000-0240.2006.0016 |
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| Authors: | PEI Jian-zhong DOU Min-jian HU Chang-shun WANG Bin-gang |
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| Affiliation: | Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an Shaanxi 710064, China |
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| Abstract: | There are many longitudinal cracks in the embankments in permafrost regions,which are widespread and difficult to control.In this paper,on the basis of investigation,together with analyses of deformation characteristics and embankment temperature regimes,the main reasons for forming longitudinal crack are attributed to the unstable area under the slope foot of an embankment,and a new model for analyzing the mechanism is presented.Through an analysis with FEM of elastic-plastic theory,the deformation and strain variations in an embankment are studied,and then three phases of the forming course are puts forward,i.e.,the initial deformation phase,strength decrease phase and a phase of failure in stability.Corresponsively,there are three zones with different characteristics within the embankment and roadbed,i.e.,developing zone,restraint zone and inducement zone.Study of the mechanism of longitudinal cracks is helpful to take measures against the cracks. |
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| Keywords: | permafrost regions embankment longitudinal crack forming mechanism |
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