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裂缝冰胀力作用下高寒危岩体失稳破坏机理
Alternative TitleCollapse Mechanism of Extreme Cold Dangerous Rock at High Altitude Under Expansive Force of Crack Ice
吴永1; 何思明2; 李新坡2; 许强3; 王东坡3
Corresponding Author吴永
2015
Source Publication四川大学学报(工程科学版)
ISSN1009-3087
Volume47Issue:6Pages:32-39
Other Abstract
高海拔极寒山体危岩的失稳崩塌是川藏山区最常见的山地灾害类型之一,但目前有关其力学机制还不清晰,难以很好地进行诊断和防治.为此,基于川藏高寒危岩体实际结构特征,借助岩石力学及断裂力学知识,构建了高寒危岩裂缝的冰胀力表达,分析了不同危岩体裂缝的断裂模式、启裂条件和扩展方向,并给出了扩展量的计算方法,明晰了高寒裂缝冰胀力诱发岩体崩塌的力学机制.算例分析表明,在环境升温幅度大于临界温升后,冰裂缝开始扩展,并最终在多轮季节性温度升降后贯通危岩体形成崩塌.
; As one of the most common mountain hazards, the collapse of dangerous rock at high altitude with freezing temperature in Sichuan-Tibet Mountains presents a serious threat to the driver traffic safety and people survival. Based on the true structure of danger rock and based on the rock fracture mechanics, an expression was developed to calculate the expansive force of crack ice. Then by analyzing the condition and process of crack propagation, the instability mechanism of dangerous rock under ice expansive force was studied clearly. Furthermore, the calculation formula for critical rise temperature and propagation length were also suggested. At last, an example was given to prove the theory. The result showed that the cracks on danger rock can propagate and develop when the temperature rises higher than the critical value, which results in the collapse occasion at last.
Keyword裂缝冰胀力 高寒危岩体 失稳破坏机理
Subject AreaTu318
DOI10.15961/j.jsuese.2015.06.005
Indexed ByEI
Language中文
Accession numberAccession number: 20155001667134
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/13890
Collection山地灾害与地表过程重点实验室
Affiliation1.中国科学院山地灾害与地表过程重点实验室,四川成都610041;
2.中国科学院水利部成都山地灾害与环境研究所,四川成都610041;
3.成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都,610059
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
吴永,何思明,李新坡,等. 裂缝冰胀力作用下高寒危岩体失稳破坏机理[J]. 四川大学学报(工程科学版),2015,47(6):32-39.
APA 吴永,何思明,李新坡,许强,&王东坡.(2015).裂缝冰胀力作用下高寒危岩体失稳破坏机理.四川大学学报(工程科学版),47(6),32-39.
MLA 吴永,et al."裂缝冰胀力作用下高寒危岩体失稳破坏机理".四川大学学报(工程科学版) 47.6(2015):32-39.
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