Analytical model for grouted rock bolts

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概要

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• This paper presents an analytical model of the grouted rock bolt in soft rock. The behavior of both the rock bolt system and the single rock bolt are discussed respectively. The coupling mechanism of rock bolt and rock mass is discussed from the viewpoint of displacement. A simple method is suggested for the rock bolt design in tunneling. According to the analysis, displacement of rock mass controls the initial force in rock mass. Case simulations confirm the previous findings that a bolt in-situ has a pick-up length, an anchor length and at least one neutral point. The theoretical prediction of single rock bolt agrees with the measured data. The position of the neutral point is not only related to the length of the rock bolt and the internal radius of the tunnel, but is also strongly influenced by the properties of rock mass. Neutral point and maximum axial load in the rock bolt tend to be constant when the anchor length of the bolt is sufficiently long, which means that increasing the length of the rock bolt may result in only a slight improvement in displacement control under certain conditions.

• 長崎大学の論文

著者

• 棚橋 由彦

  Department Of Civil Engineering

• Jiang Yujing

  Department of Civil Engineering

• Cai Yue

  Institute of Environmental Systems, Kyushu University, Japan

• Esaki Tetusro

  Institute of Environmental Systems, Kyushu University, Japan

• Cai Yue

  Institute Of Environmental Systems Kyushu University Japan

• Esaki Tetusro

  Institute Of Environmental Systems Kyushu University Japan

関連論文

• Analytical model for grouted rock bolts
• 粘性土の弾塑性・応力ヒズミ関係について-1-増分関係の定式化
• 粘性土の弾塑性応力ひずみ時間関係
• 砂の弾塑性挙動について
• 粘性土の弾塑性・応力ヒズミ関係について-2-実験による検証
• 砂の後発異方性について--応力ヒズミテンソルの異方増分関係
• 不変量表示の応力ひずみ関係式--砂の場合

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