Composition characteristics and genesis analysis of precipitates in dam foundation corridor of Shimantan reservoir
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Abstract:
The precipitates in the dam corridor were mostly products of the interaction of groundwater with solid-phase media such as bedrock and concrete.The formation and evolution of the precipitates may have adverse effects on the safe operation of the dam.Before the reinforcement of Shimantan Reservoir,there were varieties of precipitates distributed in the corridor.In order to find out their material composition and analyze their source,we sampled and analyzed the precipitates and their nearby leakage water.X-ray diffraction and fluorescence spectroscopy were used to determine the mineral and chemical composition of the precipitates.Hydrochemical diagram and model calculation were used to study the chemical composition evolution of the leakage water.The results showed that the most widely distributed white precipitate had CaO and loss on ignition as its main chemical components,and calcite as its mineral component.It came from the dissolution and reprecipitation of cement stones in the dam body.Some black precipitates were mainly composed of MnO,and they originated from manganese cement in bedrock.The analysis results together with observation data such as uplift pressure can provide a scientific basis for the seepage reinforcement of the dam.
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