摘要
大坝坝基胶状析出物是较普遍存在的现象,通过对部分大坝坝基析出物的物理性质、化学性质和矿物成分以及排水孔水质和水中微生物的分析,认识到析出物的形成主要是下层库水向坝基渗透过程中,水对岩石及帷幕、混凝土化学潜蚀作用的产物。坝基存在微生物生长繁殖的良好环境,在微生物的生命活动中,产生的无机酸和有机酸,加剧了这一过程。依据化学成分,析出物可划分为4类,其中硅、铝为主要成分的析出物的多量迁移,是坝基岩石遭受溶蚀的标志,以钙为主要成分的析出物的迁出,将削弱坝基帷幕防渗性能和混凝土的强度。
The physical characteristics,chemical composition and mineral elements of the colloidal educts in dam foundation are analyzed and the water quality and microorganism in water coming from the draining hole issuing the educts are tested.It is found that ,educts are formed by suffosion of seepage from foundation rock and concrete curtain.The environment of dam foundation is suitable for the reproduction of microorganism.The organic and inorganic acids that are produced by the life activity of the microorganism accelerate the forming process.According to their chemical elements these educts can be classified into 4 categories.In some educts,silicon and aluminum are the main components and the transfer of these kinds of educts is a mark showing that the foundation rock was dissolved and eroded.The transfer of educts mainly fcomposed of calcium will weaken the impermeability of the curtain and the strength of oundation concrete as well.
出处
《水利学报》
EI
CSCD
北大核心
2003年第9期102-106,共5页
Journal of Hydraulic Engineering
关键词
大坝
水质
析出物
微生物
化学潜蚀
dam foundation
water quality
educts
microorganism
chemieal
suffosion
