某水电站坝基析出物分析

Analysis on the Precipitates of a Hydropower Station

为了解坝基稳定性及防渗帷幕的耐久性,对某水电站大坝廊道内不同部位的各类析出物进行了化学成分、微观形貌、物相组成、岩矿及水质分析。研究结果表明,坝基析出物为基岩及防渗帷幕水泥水化后由排水孔析出后沉积而成,下游排水道内絮凝物为有机微生物,淡蓝色胶状析出物为丙烯酸盐凝胶析出物。析出物是坝基水化学潜蚀作用的产物,坝基存在微生物繁殖环境,水-岩-坝间的物理-化学作用在化学潜蚀和微生物作用下会对坝基产生影响,应加强对坝基水质、析出物的定期监测。

In order to study the stability of dam foundation and the duration of seepage control curtain, the chemical composition, microstructure and phase composition of all types precipitates in different parts of the corridor in a hydropower station, as well as the rock-mineral and water quality are analyzed. The results show that the precipitates are the hydration of bedrock and cement for seepage control curtain and deposit from drainage holes, the flocs in downstream drainage channel are micro-organisms and pale blue gelatinous precipitates are acrylate gel precipitation substances. The precipitates are the production of water chemical suffusion, and there are microbial environmental in the foundation. Thus, the physicochemical interaction between water-rock-dam would affect dam foundation in the role of chemical suffosion and micro-organisms. The precipitates of dam foundation and the quality of water should be regularly monitored.