Studies on the Prediction of Rock Failure by Counting Subaudible Noise of Rock

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  • 岩石破壊音による崩落予知に関する研究
  • ガンセキ ハカイオン ニ ヨル ホウラク ヨチ ニ カンスル ケンキュウ

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Generally, any displacement or disturbance in the rock creates an impulse or rock noise and the count of this rock noise increase according to the increase of the stress of rock. Consequently, if the rock noise were measured continuously, the rock failure would be predicted. This is the basic principle of this method of predicting rock failure. This principle was found about 20 years ago, but this prediction method have not been applied in the field, yet.<BR>In the beginning, we studied at the laboratory with several kinds of rock specimen on the following items: 1. wave form of the rock noise<BR>2. frequency spectrum of rock noise<BR>3. relation betweeen rock noise rate and stress, then, we measured rock noise in the underground of some metal mines and the rate of occurrence of rock noise in the field were analysed.<BR>Through these studies at laboratory and field, it was supposed that the rock failure would be predicted by counting the rock noise and an rock noise counter was developed.

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