Seepage Control Treatment of Dam Base in Pivotal Project of Taocha Canal Headwork of Danjiangkou Reservoir
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Abstract:
When the water level is high in the Danjiangkou Reservoir, the following problems occur in its accessory dam – the pivotal project of Taocha Canal Headwork, such as seepage in the dam base and around the dam, therefore the seepage control treatment needs to be conducted to the dam base and dam foundation. Based on the field curtain grouting experiment and the project characteristics, a reasonable seepage control treatment design and construction scheme for dam base was proposed, which can solve the following problems including drilling holes in deep overburden layers, burying and covering up grout nipple, grouting at the contact face between the land and rock, and curtain grouting to the highly permeable karst rock mass under the deep overburden layers. After the completion of the seepage control treatment for dam base, the quality and safety of the project were investigated, and the results showed that the seepage control treatment for dam base in the pivotal project of Taocha Canal Headwork meets the design requirements and achieves the desired results. The field curtain grouting experiment method, and design and construction scheme can provide reference for solving similar problems of seepage control of deep overburden layers.
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