Research on the Solidification of Fallen Debris at Goaf and Subsidence of Intermediate Rock Strata above Goaf

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Other Title
  • 古洞崩落岩塊の固化と岩盤ベッドの沈下に関する研究
  • 古洞崩落岩塊の固化と岩盤ベッドの沈下に関する研究--ウォールタイプ採炭に伴う岩盤の挙動(第3報)
  • コドウ ホウラク ガンカイ ノ コカ ト ガンバン ベッド ノ チンカ ニ カンスル ケンキュウ ウォール タイプ サイタン ニ トモナウ ガンバン ノ キョドウ ダイ3ポウ
  • - ウオールタイプ採炭に伴う岩盤の挙動(第3報) -
  • - Caving and subsidence of rock strata by wall type mining (3rd Report) -

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Abstract

In the comprehensive research on the surface subsidence occurred by various underground longwall mining in various countries that was reported previously, the author analyzed relationship between ki (breaking factor of fallen debris) and various mining methods or various physical characteristics of the rock strata.<br> Specifically speaking, the author calculated various ki in the solid-state single seam and multipass mining carried out at Kushiro Colliery, and in various mining applied in England. As a result of the studies, it was found that ki value drastically changes according to the difference of physical characteristics of rock strata, and the disturbance of rock strata above goaf by secondary mining as well.<br> With regard to the outcome of the studies, the author proved that the solidification of fallen debris after 2 years of termination of mining at the top lift has sufficient strength to be supported by the shield supports at lower lift under the circumstance of only 100 m below the surface. And the presentation mentioned above was eventually accepted by the Bureau of Mines, United States Department of Interior, and proposal to the US National Project with an idea to apply the Multi-step slicing method was placed to order as a first occasion for the Japanese Coal Mining Industry.<br>

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 116 (10), 847-854, 2000

    The Mining and Materials Processing Institute of Japan

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