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大坝坝基排水孔口出现的胶状析出物，主要是坝基环境下水—岩石、水—混凝土间相互作用的结果，析出物中硅、铝成分含量丰富或含有丙凝凝胶时，它是评价坝基软岩和丙凝帷幕性状变化的重要依据。
The gelatinous precipitates appearing on the drainage base of the dam foundation are mainly the result of water-rock and water-concrete interaction in the dam foundation. When the content of silicon and aluminum in the precipitates is rich or contains the gel of Propane gel, it is an evaluation An important basis for the change of the soft rock and the properties of the clinker curtain in dam foundation.