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文摘
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以三峡库区云阳塞坝滑坡为例，分析了层状砂泥岩缓坡平台上崩滑堆积物中因开挖引起变形的机理。研究表明，崩滑堆积物呈蜂窝状分布的富水含水层，因远距离开挖失水而导致的不均匀变形，是地面出现拉裂的主要原因；平台中的公路开挖所诱发的边坡回弹变形仅限于局部范围。这两类变形的发生在时间上或相应的施工期间可能表现为表观的“同步”现象，但不均匀变形随着含水层排水的完成而结束，而开挖所诱发的回弹变形，则可以随着外界条件的变化而不断发展，直至发生滑坡。在空间上，两类变形具有不同的特征，其中，不均匀固结变形的发生以不规则的孤立含水层为中心向外发展，而回弹变形则局限于临空面附近，远离临空面时变形量和变形速率迅速减小。在富含地下水的松散堆积物中进行工程施工时，区分两类变形机理和效应，对于减少滑坡误判 ，正确进行工程设计，减少工程造价具有重要意义。 |
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其他语种文摘
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The releasing rules of carbon dioxide under the condition of contact metamorphosis were systematically studied, and the releasing amount of carbon dioxide was calculated by modeling. Taking marble of Shuangshan area in southern Tanlu fault belt as an example, the sur-rounding rocks and intrusive body for controlling carbon dioxide releasing under the condition of carbonate rock metamorphism were investi-gated. The results show that the releasing amount of carbon dioxide has close relation with the characteristics of the surrounding rock includ-ing thermal conductivity of surrounding rock as well as permeability, porosity and connectivity of rock. The compositions of intrusive body, intrusive depth, scale and occurrence under the action of contact metamorphism of surrounding rock have the important influences on carbon dioxide releasing. The occurrence of the intrusive body resulted in a great deal of fractures in the surrounding rocks and thus made fluid flow-ing and accumulation easily. The full evidence proved that the carbon dioxide produced under contact metamorphism condition could form an industrial-scale inorganic natural gas reservoir in some conditions. On the basis of theoretical and practical study, a circular cylinder model for determining carbon dioxide releasing amount under the contact meta morphism was proposed. It is suggested that the exploration of carbon dioxide reservoir should also be paid attention to the outside oil-and-gas bearing basins. |
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来源
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水文地质工程地质
,2003,30(4):1-6 【核心库】
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关键词
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塞坝滑坡
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机理
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固结效应
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回弹变形
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参数反分析
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地址
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1.
中国科学院力学研究所, 北京, 100080
2.
长江水利委员会综合勘测局, 武汉, 430074
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-3665 |
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学科
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地质学 |
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基金
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中国科学院知识创新工程重要方向项目
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国家水利部长江水利委员会综合勘测局项目
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文献收藏号
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CSCD:1170228
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