How to prevent Convergence and Fall in the GAllery.

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  • 坑道の狭小化および崩落防止のための調査と考え方
  • コウドウ ノ キョウショウカ オヨビ ホウラク ボウシ ノタメノ チョウサ ト カンガエカタ

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Abstract

Various causes of convergence of the gallery were pursued, and the methods for reasonable supporting determined by investigations on the strata around the gallery were described. The counter measure to prevent fall of rocks in a roadway was also discussed.

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