基于碳同位素的水电站钙质析出物形成机制研究
发布时间：2018-09-12 15:27
【摘要】：根据自然界中碳与工程设施中碳组分的关系,碳的不同物理状态、化学存在形式和同位素组成,设计并进行室内和帷幕廊道的析出物模拟试验,室内防渗帷幕模拟渗透试验和帷幕廊道现场试验。将4类试验进行对比分析,并根据碳酸平衡和同位素分馏理论,研究白色钙质析出物成因和反应机理。通过追踪碳循环,得出水工建筑物或防渗帷幕廊道中白色钙质析出物最可能是混凝土或防渗帷幕遭受溶出型侵蚀作用的结果,碳酸盐类基岩对白色钙质析出物贡献不大。溶出型侵蚀产生的强碱性渗排水在渗流过程中较少参加碳循环反应,需流出暴露于空气,与空气中CO_2反应析出CaCO_3,并发生同位素分馏。
[Abstract]:According to the relationship between carbon in nature and carbon components in engineering facilities, different physical states, chemical forms and isotopic compositions of carbon, simulation tests of precipitates in indoor and curtain corridors are designed and carried out. Indoor seepage curtain simulation penetration test and curtain corridor field test. The causes and reaction mechanism of white calcium precipitates were studied according to carbonation equilibrium and isotopic fractionation theory. By tracing the carbon cycle, it is concluded that the white calcium precipitates in hydraulic structures or impervious curtain corridors are the most likely to be the result of dissolution erosion of concrete or impervious curtain, and carbonate bedrock has little contribution to the white calcium precipitates. The strong alkaline seepage drainage produced by dissolution erosion rarely participates in the carbon cycling reaction in the seepage process, it needs to be exposed to air, react with CO_2 in air to precipitate CaCO_3, and produce isotopic fractionation.
【作者单位】： 贵州大学资源与环境工程学院;中国电建集团贵阳勘测设计研究院有限公司;
【基金】：中国电建集团科技项目(DJ-ZDXM-2014-21)
【分类号】：TV738
本文编号：2239450
[Abstract]:According to the relationship between carbon in nature and carbon components in engineering facilities, different physical states, chemical forms and isotopic compositions of carbon, simulation tests of precipitates in indoor and curtain corridors are designed and carried out. Indoor seepage curtain simulation penetration test and curtain corridor field test. The causes and reaction mechanism of white calcium precipitates were studied according to carbonation equilibrium and isotopic fractionation theory. By tracing the carbon cycle, it is concluded that the white calcium precipitates in hydraulic structures or impervious curtain corridors are the most likely to be the result of dissolution erosion of concrete or impervious curtain, and carbonate bedrock has little contribution to the white calcium precipitates. The strong alkaline seepage drainage produced by dissolution erosion rarely participates in the carbon cycling reaction in the seepage process, it needs to be exposed to air, react with CO_2 in air to precipitate CaCO_3, and produce isotopic fractionation.
【作者单位】： 贵州大学资源与环境工程学院;中国电建集团贵阳勘测设计研究院有限公司;
【基金】：中国电建集团科技项目(DJ-ZDXM-2014-21)
【分类号】：TV738
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