| 隧道衬砌冻胀压力问题研究 |
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| 引用本文： | 王建宇,胡元芳.隧道衬砌冻胀压力问题研究[J].冰川冻土,2004,26(1):112-119. |
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| 作者姓名： | 王建宇 胡元芳 |
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| 作者单位： | 中国铁路工程总公司, 西南科学研究院, 四川, 成都, 610031 |
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| 摘 要： | 冻胀压力的量值和分布不仅取决于围岩的性态和气象条件,而且同衬砌结构的材料、刚度以及施工质量密切相关,从岩石和土层两种围岩中衬砌承受冻胀压力的机理出发,探讨其计算方法.通过计算分析,对寒冷地区隧道衬砌的设计和施工提出了若干建议.
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| 关 键 词： | 冻土 隧道工程 衬砌 |
| 文章编号： | 1000-0240(2004)01-0112-08 |
| 收稿时间： | 2003-04-18 |
| 修稿时间： | 2003年4月18日 |
A Discussion on Frost-Heaving Force on Tunnel Lining |
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| WANG Jian-yu,HU Yuan-fang.A Discussion on Frost-Heaving Force on Tunnel Lining[J].Journal of Glaciology and Geocryology,2004,26(1):112-119. |
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| Authors: | WANG Jian-yu HU Yuan-fang |
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| Institution: | Southwest Science Academy of China Railway Engineering Corporation, Chengdu Sichuan 610031, China |
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| Abstract: | Some measures may be used to protect from frost of tunnel constructed in severe cold regions. Drainage system for preventing groundwater accumulation and thermal insulated panels are often used.;Even though, in most cases frost-heaving force on tunnel lining still appears obviously. They usually cause lining deformed, cracked and broken.;On base of tracing mechanism and characteristics of frost-heaving force, different models for calculating it in case of rock and soil surrounding ground are adopted respectively.;Take a designed tunnel cross section for example, by using numerical method a sensitivity analysis of the influences of lining parameters and construction condition on the frost-heaving force are achieved. Effects of lining thickness and place of water-contained space behind the lining structure are shown as tables1 and 2.;Finally, some conclusions are presented as follow:;(1) Frost-heaving force cannot be expressed as a constant pressure. As a kind of deformation load, its distribution and value depend not only on climate condition, properties of rock or soil of surrounding ground but also on lining rigidity the thicker the lining is, the larger the frost-heaving force appears.;(2) In case of rock tunnel, the gaps or spaces remained between the lining and the surrounding rock may be the very origin that causes a frost-heaving force. Analysis shows that it is especially damaging to remain a gap or space in crown or invert. To make lining and surrounding rock tightly contacted is important for tunneling in severe cold regions. In that case, adopt of smooth blasting is necessary and muck filling behind lining must be strictly forbidden.;(3) Thermal insulated panel pays an important role for reduction of frost-heaving force. The material of panel should be chosen and tested carefully. |
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| Keywords: | Frozen tunneling lining |
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