乌东德水电站坝址区地下水中SO_4^(2-)来源分析及处理措施研究

Groundwater SO_4^(2-) Genesis Analysis and Engineering Treatment in Wudongde Hydropower Station

乌东德水电站坝址区地下水SO42-离子浓度高,对混凝土具结晶类硫酸盐型腐蚀。通过坝址区水文地质条件分析、SO42-离子相关性分析、岩石矿物和化学成分与地下水化学分析,查明了坝址区地下水中SO42-来源及其分布特征——SO42-系岩石中黄铁矿经一系列化学反应的产物,受地层中黄铁矿富集程度、水动力条件差异影响,不同地层、不同地段SO42-离子浓度存在一定差异,并从保障工程安全运行、降低工程造价出发提出永久/临时建筑物有别的针对性工程处理措施,为工程设计提供了依据,并为其它类似工程提供了借鉴。

In the dam area of Wudongde hydropower station,the groundwater is with high concentration of SO42- which has crystal sulfate corrosion with the concrete.The source SO42- and distribution SO42- concentrationin groundwater has been discovered by the analysis of hydro geological characteristics in dam area,correlation analysis of SO42-,the analysis of chemical composition on rock and mineral and groundwater chemical analysis.SO42- is the product of pyrite in rocks with a series of chemical reaction,which is affected with the enrichment degree of pyrite and hydrodynamic conditions.There are differences in the concentration of SO42- among different stratums and different sections.Meanwhile,in order to make sure the security of the project and reduce the project cost,the specific engineering treatment measures have been suggested for the permanent or temporary buildings.It provides the important basis for the engineering design and the study experience can be referenced by other similar engineering.