川藏铁路廊道辉绿岩及花岗岩冰劈作用机理试验研究
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- 英文论文题名：Experimental Study on Freeze-thaw Mechanism on Diabase in Sichuan-Tibet Railway Corridor
- 论文作者：王运生 ; 乔国文 ; 余相贵 ; 雷清雄
- 英文论文作者：Wang Yunsheng ; Qiao Guowen ; Yu Xianggui ; Lei Qingxiong ; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection ; Chengdu University of Technology
- 年：2016
- 作者机构：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;
- 论文关键词：高寒山区 ; 岩体冻融 ; 冰劈试验 ; 应变试验
- 英文论文关键词：Sichuan-Tibet railway corridor ; rock freezing ; freeze-thaw slope ; collapse
- 会议召开时间：2016-10-14
- 会议录名称：“川藏铁路建设的挑战与对策”2016学术交流会论文集
- 语种：中文
- 分类号：U213.1
- 学会代码：ZGTD
- 会议名称：“川藏铁路建设的挑战与对策”2016学术交流会
- 会议地点：中国四川成都
- 主办单位：中国铁道学会、中国铁道学会工程分会、中国中铁股份有限公司、中铁二院工程集团有限责任公司
- 学会名称：中国铁道学会
- 页数：5
- 文件大小：467k
- 原文格式：O
- 会议级别：全国
摘要
高寒高海拔地区岩体冻融风化对边坡稳定性的影响大。本文通过高寒峡谷区边坡岩体冻融实验及综合分析,揭示了冻融风化破坏机制:①岩体的冻融风化过程,主要是在大温差循环过程中,岩体逐渐裂化导致岩体强度弱化,甚至岩体发生破碎的过程;②大温差是岩体冻融风化的主要影响因素,纯粹的降温导致岩体中自由水膨胀,产生冻胀力,增加了岩体的应变,但冰胶结反而可以提高岩体的强度;③冻融风化中,岩体中的自由水是破坏岩体结构的主要发起因素,岩体空隙中的水凝结成冰,体积产生约9%的膨胀,在空隙壁上产生巨大的冻胀力,即冰劈效应;④岩体中裂隙的发育情况,决定水分及温度的分布规律,因此岩体的初始损伤情况对冻融风化的影响较大,裂隙越发育,其被冻融破坏的可能性越大。
Influence of freezing and thawing on slope stability in high cold and high altitude area is too heavy.In this paper,the freezing and thawing experiment and comprehensive analysis of the slope rock mass in the alpine gorge region revealed the failure mechanism of freeze-thaw and weathering:①rock freeze-thaw weathering process,mainly in large temperature cycle,the rock gradually lead to cracking of rock strength weakening,even rock broken process.②large temperature difference is the main influencing factor of the rock freeze thaw weathering,pure to cool rock free water expansion,frost heaving force,increase the strain of rock,but ice cemented on the other hand can improve rock strength.③the process of the freeze-thaw weathering,the rock free water is the main driving factor of the destruction of the rock structure,rock voids hydrogel into ice,generating about9%volume expansion in the space of a huge wall of frost heave forces,namely the ice splitting effect.④the development of the situation in the rock fractures which determines the distribution of moisture and temperature,so the initial damage of rock is the larger impact on the freeze-thaw weathering,the more development of cracks,the more likely it is freeze-thaw damage.
Influence of freezing and thawing on slope stability in high cold and high altitude area is too heavy.In this paper,the freezing and thawing experiment and comprehensive analysis of the slope rock mass in the alpine gorge region revealed the failure mechanism of freeze-thaw and weathering:①rock freeze-thaw weathering process,mainly in large temperature cycle,the rock gradually lead to cracking of rock strength weakening,even rock broken process.②large temperature difference is the main influencing factor of the rock freeze thaw weathering,pure to cool rock free water expansion,frost heaving force,increase the strain of rock,but ice cemented on the other hand can improve rock strength.③the process of the freeze-thaw weathering,the rock free water is the main driving factor of the destruction of the rock structure,rock voids hydrogel into ice,generating about9%volume expansion in the space of a huge wall of frost heave forces,namely the ice splitting effect.④the development of the situation in the rock fractures which determines the distribution of moisture and temperature,so the initial damage of rock is the larger impact on the freeze-thaw weathering,the more development of cracks,the more likely it is freeze-thaw damage.
引文
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