天盤崩落現象に関する基礎的研究

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書誌事項

タイトル別名
  • A Fundamental Study on Roof Fall Phenomenon
  • テンバン ホウラク ゲンショウ ニ カンスル キソテキ ケンキュウ

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抄録

For the purpose of the study on the mechanism of roof fall in the long wall mining, the authors have first studied fundamentally the stability of the roof beam which is separated from the upper seam and deforms only by its dead weight and secondly studied experimentally the roof fall phenomena by the model test through the use of the centrifuge. It is found from these studies that when the separated roof beam from the upper seam deforms only by its dead weight, the tensile fractures easily break out at the down side of roof center and at the upsides near the ends of flat cavity, but the roof fall does not occur at least unless the compressive yieldings iniciate at the bearing points in this cracked roof beam under the following condition, that is Q= 0.5ScD2/L where Q is the total dead weight, Sc is the compressive strength, D is the thickness of roof beam and L is the length of roof. In the case of very brittle rock roof, the roof fall occurs on this condition, but in case the plastic bending takes place before the collapse, the roof fall is caused by the compressive fracture just over the central tension crack under the following condition, that is Q= 2Sc (D-d)2/L<BR>where d is the deflection of roof.

収録刊行物

  • 日本鑛業會誌

    日本鑛業會誌 95 (1097), 387-392,410, 1979

    一般社団法人 資源・素材学会

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