作　　者： (刘胜）; (余波）; (郑克勋）; (马聪）;

机构地区： 贵州大学资源与环境工程学院,贵州贵阳550025 中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处： 《水力发电》 2017年第9期113-118,共6页

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。 According to the relationship between the carbon in nature and the carbon component in engineering facilities, and different physical, chemical and isotopic compositions of carbon, the precipitates simulation testes in curtain corridor and indoor and indoor anti-seepage curtain penetration simulation test and on-site curtain corridor test are designed and carried out. By comparing the results of above four types of tests and based on the theories of carbonate balance and isotope fractionation, the causes and reaction mechanism of white calcium precipitates are studied. By tracking the cycle of carbon, it is concluded that the white calcium precipitates of hydraulic structures or anti-seepage curtain ~orridor are most likely as a result of the dissolution erosion of concrete or impervious curtain, hut the carbonate rock contributes little to white calcium precipitates. The alkaline water caused by the dissolution erosion is less to participate in the carbon cycle in the procesS of seepage, which needs react with carbon dioxide in air to produce calcium carbonate and isotope fractioaatian.

关 键 词： 碳稳定同位素 钙质析出物 对比试验 溶出型侵蚀 形成机制