陈村大坝底孔电站兴建后坝基渗流场的变化  

Change of Seepage under Chencun Dam after Constructing Bottom Outlet Power Station

作　　者：潘忠华[1] 王建平[1] 马晓辉[1] 彭汉兴[1] 

机构地区：[1]河海大学土木工程学院,南京210098

出　　处：《长江科学院院报》2007年第5期68-71,共4页Journal of Changjiang River Scientific Research Institute

摘　　要：通过对陈村大坝底孔电站修建前后的坝基扬压力、水质、现场pH测定等的分析比较,并结合运用ARIMA模型对渗压系数的变化作预测,总结出了变化的趋势,讨论了底孔电站修建后坝基渗流特征的变化。观测结果显示:电站运行后,渗流场发生明显变化,地下水位降低,扬压力普遍减少;但库水对坝基帷幕和软岩的水压力增大,对坝基防渗不利。坝基水的化学性质(碱性)对大坝帷幕混凝土防腐有利。通过模型预测值与监测值比较,两者拟合较好。By analysing the uplift pressures of dam foundation, water quality, and pH values before and after the construction of the Chencun Dam, the changes of seepage characteristics are discussed. The tendency of permeability coefficient is forecasted by use of ARIMA model. The movement of seepage and change of water quality will influence the dam security. The observed data after the power station operation show that the seepage field is changed obvioussly, groundwater level is degraded, and the uplift pressures are widespreadly reduced, but the pressure exerted by reservoir water on the curtain and soft rock is raised. The alkalinity in water is beneficial to protect the concrete of the dam from corrosion. It is seen from comparison the forecasted values given by the model are in good agreement with the monitored data.

关 键 词：底孔电站 渗流场 水质 ARIMA模型 

分 类 号：TV223.4[水利工程—水工结构工程]