A study on safety margin of sectional forces for design of rockfall protection gallery under impact loading

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  • ロックシェッドの衝撃荷重載荷時における設計断面力の安全余裕度に関する一検討
  • ロックシェッド ノ ショウゲキ カジュウサイカジ ニ オケル セッケイ ダンメンリョク ノ アンゼン ヨユウド ニ カンスル イチ ケントウ

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Abstract

In this study, in order to investigate the safety margin of sectional forces estimated by means of existing impact resistant design method for rockfall protection gallery, the sectional forces obtained based on the existing allowable stress design specifications were compared with those obtained from the full-scale falling-weight impact test of a rockfall protection gallery. From this study, following results were obtained: 1) design values for sectional bending moment were greater than those from the experimental results, irrespective of cushion materials (sand and/or gravel) and the location of impacted point; and 2) safety margin of the load-carrying capacity for roof slab was smaller than that for column and wall.

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