Development of Advanced Natural Gas Storage by Steel-Lined Rock Cavern System

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Other Title
  • 鋼製ライニング式岩盤貯槽による天然ガス高圧貯蔵技術開発
  • 鋼製ライニング式岩盤貯槽による天然ガス高圧貯蔵技術開発(第2報)気密材の局部大変形に関する検討
  • コウセイ ライニングシキ ガンバンチョソウ ニ ヨル テンネン ガス コウアツ チョゾウ ギジュツ カイハツ ダイ2ホウ キミツザイ ノ キョクブ ダイヘンケイ ニ カンスル ケントウ
  • 第2報: 気密材の局部大変形に関する検討
  • 2<sup>nd</sup>Report : Study for Local Buckling Deformation of Steel Liner Plate

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For the practical use of Lined Rock Cavern (LRC) gas storage system called ANGAS (Advanced Natural GAs Storage) , one of the important technical issues is the confirmation of the design procedure for steel liner. The steel liner plate should be designed to keep the integral structure with the backfilled concrete and surrounding rock mass, as the cavern expands and contracts by cyclic pressure load. To satisfy this design concept, the steel liner is required to deform up to plastic region when the internal pressure is acting, so that the steel liner plate does not separate from the backfilled concrete due to residual displacement of the rock at the release of internal pressure. Based on this concept, the design procedure for the steel liner consists of following items as explained in the 1streport. <br> (1) Check for strain accumulation due to cyclic pressure load during operation<br> (2) Stability check for local buckling at the release of internal pressure<br> (3) Stability check for overall buckling at the release of internal pressure<br> (4) Calculation of strain concentration due to concrete cracking and check for fatigue failure<br> (5) Calculation of strain concentration and check of fatigue failure for discontinuous structure between concrete layer and concrete plug<br> Especially, local buckling, which may occur in initial imperfection at the weld seam of steel liner due to compressive load at the release of internal pressure, is complex behavior includes material nonlinear problem and contact problem with surrounding materials. We have performed the laboratory experiment with model lining plates and the FEM analysis for the experiment model, in order to verify reasonability and reliability of the design procedure for local buckling behavior. As a result, the FEM analysis could simulate the local buckling behavior and it was shown that the design procedure could be applied for the actual storage system.

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