炭層内の破壊音に関する研究

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書誌事項

タイトル別名
  • Some Researches of Microseismic Vibration, or Rock Noise, in Coal Seams
  • タンソウ ナイ ノ ハカイオン ニ カンスル ケンキュウ

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抄録

Microscopic failures and displacements in rocks create a kind of microseismic vibrations, “rock noise”, according to the stress condition of surrounding rocks. The authors have made a series of researches concerning the microseismic method to predict rock failures. In order to apply this method to coal mines, thenoise-occurrence characteristics of coal were examined on several types of samples in laboratory.<BR>Noise measurement in coal. mines was performed around the working face of the Ibaragi colliery in Johban district. The conclusions of this report are as follows:<BR>1) The frequency range of noises, either 2-8kc/s or 16-32kc/s, is suitable for the method in coal seams. The noises in the latter range could be generally applicable.<BR>2) The rate of occurrence of rock noise is the main factor to predict rock failure. Not only for the condition of increasing stress, but under constant load, this principle could be applied.<BR>3) The possibility to assume the position and the types of failure in seams, is attained from thefrequency analysis of rock noise.<BR>4) The rate of occurrence of rock noise along the coal getting face varies almost symmetrically. The middle part of long face is “silent”, whereas the both ends of face show high rate of occurrence of noise.<BR>5) The rate of occurrence of rock noises in the gate road decreases rapidly according with the distance from the coal getting face. This trend corresponds to the result of rock pressure measurements.

収録刊行物

  • 日本鑛業會誌

    日本鑛業會誌 80 (910), 349-355, 1964

    一般社団法人 資源・素材学会

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