The Relation between Bit Diameter and AE Activities During Boring in Coal Seam

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Other Title
  • 炭層ボーリング中のAEと口径依存性
  • 炭層ボーリング中のAEと口径依存性--沿層ボーリング中のAE活動に関する研究-3-
  • タンソウ ボーリングチュウ ノ AE ト コウケイ イゾンセイ エンソウ ボー
  • 沿層ボーリング中のAE活動に関する研究 (第3報)
  • Study on acoustic activity due to advance boring in coal seam

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Abstract

In coal mines AE method is applied to testboring in an attempt to obtain the necessary information about the stress distribution in coal seams where coal outburst might occur. AE counts are measured as the main value in AE activities. This value seems to be affected by borehole diameters. There havebeen in a state of uncertainty with regard to the relation between AE counts and borehole diameters.In order to make clear this uncertainty, six boreholes of various diameters were drilled, and duringthe drilling AE counts were measured.<BR>As a result of this tests, AE ring down counts, (Y) during boring are related to borehole diameters (X) by the following equation: Y=2.3×10-2X22.004Theoretical formula for the relation between X and Y derived by using the probability theory agree with theexperimental result.

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