Investigation and Measures against Internal Restraint Crack due to Thermal Stress of RCC Dam—Practice at Nam Ngiep 1 Hydropower Project in Lao PDR—

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  • AOSAKA Yushi
    関西電力株式会社 水力事業本部 水力エンジニアリングセンター 国内水力グループ
  • KAWATA Tatsuya
    ナムニアップ1パワーカンパニー
  • TSUTSUI Shoji
    関西電力株式会社 水力事業本部 水力部

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Other Title
  • RCCダムの温度応力による内部拘束ひび割れの原因究明と対策－ラオス国ナムニアップ1水力発電プロジェクトの事例－
  • RCC ダム ノ オンド オウリョク ニ ヨル ナイブ コウソク ヒビワレ ノ ゲンイン キュウメイ ト タイサク : ラオスコク ナムニアップ 1 スイリョク ハツデン プロジェクト ノ ジレイ

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<p>During construction of the Roller Compacted Concrete (RCC) dam at the Nam Ngiep 1 hydropower project (NNP1) in Lao PDR, cracks in the direction of the dam axis emerged on the RCC placing surface at the left bank side where RCC placing suspended in order to install the penstock to be embedded in the dam body. The NNP1 conducted the crack investigation and thermal stress analysis by inputting the observed ambient temperature and development of RCC strength into the analysis and it was found that the main cause was the difference of the concrete temperature between inner and surface portions of the RCC according to the sudden larger drop of the ambient temperature compared in the mid December than that of the average year. This report presents the process of the above investigation and analysis for seeking the cause, check of the dam stability, and measures based on hearing from RCC experts.</p>

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