安威川ダム
ダムサイト基礎岩盤面観察・評価業務委託
（H28）

報

告書

（設計編）

平成 29 年 11 月

大阪府

安威川ダム建設事務所

株式会社

ニュージェック

安威川ダム ダムサイト基礎岩盤面観察・評価業務委託（設計編）
目 次
第 1 章 業務概要 （共通） ····················································· 1-1
第 2 章 安威川ダムの概要（共通） ·············································· 2.1-1
2.1 ダム概要 ······························································· 2.1-1
2.2 ダム計画の概要 ························································· 2.2-12.3 地形・地質概要 ························································· 2.3-12.3.1 地形概要 ··························································· 2.3-12.3.2 地質概要 ··························································· 2.3-3
2.4 ダムサイトの岩盤状況 ··················································· 2.4-1
第 3 章 本体設計検討（基礎掘削工） ············································ 3.1-1
3.1 非常用洪水吐き第二減勢工部仮設法面ロックボルト工の検討 ················· 3.1-1
3.2.1 施工状況の整理 ····················································· 3.1-1
3.2.2 対策規模の検証(修正設計) ··········································· 3.1-43.2 非常用洪水吐き流入部仮設法面ロックボルト工の検討 ······················· 3.3-1
3.2.1 施工状況の整理 ····················································· 3.3-1
3.2.2 対策工設計 ························································· 3.3-4
3.3 左岸頂部法面対策工の追加対策検討 ······································· 3.3-13.3.1 検討経緯 ··························································· 3.3-13.3.2 間隙水圧を考慮した既設法面対策工の検証 ····························· 3.3-7
3.3.3 追加法面対策工 ····················································· 3.3-23
3.4 左岸頂部法面対策工の変状履歴整理及び対策工検証 ························· 3.4-1
3.4.1 検討経緯 ··························································· 3.4-1
3.4.2 すべり面強度の見直し ··············································· 3.4-123.4.3 永久法面の安全性検証 ··············································· 3.4-55
第 4 章 本体設計検討(盛立工) ·················································· 4.1-14.1 コア敷き止水壁及び分水壁設計検討 ······································· 4.1-2
4.1.1 検討経緯 ··························································· 4.1-2
4.1.2 止水壁形状 ························································· 4.1-54.1.3 構造詳細 ··························································· 4.1-154.2 ロック敷き基礎地盤安定検討 ············································· 4.2-14.2.1 基礎条件と基礎岩盤分布状況 ··········································· 4.2-14.2.2 Ｄ級岩盤の分布に対する基礎地盤の安定検討 ····························· 4.2-34.2.3 施工時岩盤分布での安定性検証 ········································· 4.2-144.3 外部ロック材の設計強度見直し可能性検討 ································· 4.3-14.3.1 現設計概要 ························································· 4.3-24.3.2 平面すべりによる勾配の確認 ········································· 4.3-4

4.3.3 円弧すべりによる勾配の確認 ········································· 4.3-64.3.4 盛立試験結果を用いた堤体安定計算 ··································· 4.3-13
第 5 章 本体設計検討(材料採取工) ·············································· 5.1-1
5.1 フィルター材施工時試験結果の整理 ······································· 5.1-1
第 6 章 本体設計検討（基礎処理工） ············································ 6.1-1
6.1 F-1 断層部置換コンクリート検討 ········································· 6.1-26.1.1 施工状況 ··························································· 6.1-26.1.2 F-1 断層部における平板載荷試験 ····································· 6.1-5
6.1.3 対策工の検討 ······················································· 6.1-96.2 F-1 断層部監査廊修正設計検討 ··········································· 6.2-1
第 7 章 本体設計検討（その他関連工種） ········································ 7.1-17.1 監査廊左岸出入口部及び非常用洪水吐き導流部修正設計検討 ················· 7.1-2
7.1.1 掘削形状の見直しと監査廊配置検討 ··································· 7.1-3
7.1.2 構造設計 ··························································· 7.1-15
7.2 河床部及び左岸部監査廊修正設計検討 ····································· 7.2-1
7.3 取水放流設備導水管線形及び周辺掘削形状修正検討 ························· 7.3-1第 8 章 ロック材大型三軸圧縮試験 ·············································· 8.1-18.1 試験材料採取 ··························································· 8.1-18.2 大型三軸圧縮試験 ······················································· 8.2-18.2.1 試験方法 ··························································· 8.2-18.2.2 試験結果 ··························································· 8.2-6
第 9 章 総合検討（共通） ······················································ 9-1

【添付資料】
添付資料１．設計数量計算書 ················································· 添 1.1-1
添付資料 1.1 監査廊工 ···················································· 添 1.1-1
添付資料 1.2 非常用洪水吐き導流部 ········································ 添 1.2-1
添付資料２．構造計算書 ····················································· 添 2.1-1
添付資料 2.1 監査廊工(左岸出入口部) ······································ 添 2.1-1
添付資料 2.2 非常用洪水吐き導流部(監査廊開口部)··························· 添 2.2-1
添付資料３．大型三軸圧縮試験データシート ··································· 添 3-1
添付資料４．第一減勢工斜面安定確認対応 ····································· 添 4-1【別冊資料】
修正設計図面集・1 監査廊工・2 非常用洪水吐き導流部
・3 計測設備工（修正箇所のみ）