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THE BEAR CREEK DAM, ALABAMA

机译：阿拉巴马州BEAR CREEK DAM

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In July of 2007, the Tennessee Valley Authority (TVA) selected the authors to serve on a two member senior review board (Board) for the investigation, design and construction of the rehabilitation of the existing Bear Creek Dam, Alabama. This Board was empowered to make original and fundamental contributions to the project in real time. The Engineer of Record for TVA was P.C. Rizzo and Associates. This embankment dam was built on a karstic limestone foundation. Since construction, up to 1500 gpm of seepage had developed through the dam's foundation during flood pool storage levels. Previous efforts to reduce and control seepage had been unsuccessful.rnThe paper provides an overview of the safety issues with the existing dam, and the strategies developed for 1) characterization of the karst foundation materials, 2) construction risk management, 3) the configuration and details of the foundation excavation and treatment program that was completed including a multi-line grout curtain and discrete karst feature cutoff panels. In addition, the paper discusses the stability evaluation of the dam, development of the dam cross-section, mix design, and seepage control details of the new replacement Roller Compacted Concrete (RCC) berm. This was constructed immediately downstream of the existing dam while the embankment was maintained in service.
机译：2007年7月，田纳西河谷管理局（TVA）选择作者担任两个成员的高级评审委员会（Board）的工作，负责对阿拉巴马州现有Bear Creek大坝的修复进行调查，设计和建设。该委员会有权实时为该项目做出原始和基本的贡献。 TVA记录工程师是P.C. Rizzo和同事。该堤坝建在岩溶石灰岩地基上。自建设以来，在蓄水池蓄水期间，通过大坝的基础已经产生了高达1500 gpm的渗漏。以前减少和控制渗流的努力一直没有成功。rn本文概述了现有大坝的安全问题，以及为以下方面制定的策略：1）岩溶地基材料的表征，2）施工风险管理，3）构造和已完成的基础开挖和处理程序的详细信息，包括多线灌浆幕和离散的岩溶特征截断面板。此外，本文还讨论了大坝的稳定性评估，大坝横截面的开发，混合料设计以及新的替代碾压混凝土（RCC）护堤的防渗细节。它是在堤坝维持服务状态时，在现有大坝的下游直接建造的。

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