摘要
对坝址区地下水中离子活度的研究,在探讨水-岩-坝相互作用方面起着重要的作用,由其计算得到的饱和指数是判断坝基帷幕体防渗时效性的一个重要参数。分别应用Debye-Hckel方程和Pitzer模型2种方法计算坝址环境水的离子活度,并对结果进行了比较分析。结果表明,对于坝址区普遍存在的高pH值地下水,Debye-Hckel方程求解过程中可能会出现迭代异常而出现无解的情况,且对于CO23-离子,计算结果也存在较大偏差;相比之下,Pitzer模型则具有较好的普遍性和计算精度。因而认为,在计算大坝等水工建筑物地区地下水的离子活度时,Pitzer模型可得到更广泛的应用。
The ionic activity calculation in groundwater around a dam-site is an important aspect in the simulation of water-rockdam interaction, and the saturation index calculated is very useful for determining the anti-seepage effect of the dam-foundation curtain. The Debye-Hvckel equation and the Pitzer model are used to calculate the ionic activity of environmental water around a dam-site. The results based on the comparative analysis show that, under high pH value condition there would be no solution in some circumstances by the Debye-Hvckel equation and the calculated value of CO3^2- is not accurate, but the Pitzer model can solve it perfectly for its better suitability. So the Pitzer model could be widely used in artificial built-up areas such as dam-sites.
出处
《水电自动化与大坝监测》
2010年第1期57-61,共5页
HYDROPOWER AUTOMATION AND DAM MONITORING
