切羽炭層における地圧変化の測定

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タイトル別名
  • Stress Variation in Coal-Seam near Longwall Workings Underground
  • キリハ タンソウ ニ オケル チアツ ヘンカ ノ ソクテイ

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抄録

Some concepts concerning stresses in rock around an underground workings have been proposed by some reseaschers. However, such concepts depend on theoretical considerations and on results of loads acting on underground supports near workings.<BR>To realize stress distribution in coal-seam or rock near workings, the author has made loadcells which are fixed by wire straing gauges, and a strain meter which is convenient for use underground. Structure, sensitivity and other characteristics of the load-cell and strain meter are illustrated.<BR>To measure the stress variation in a coal-seam, a load-cell is pushed in a bore hole drilled in the coal-seam. The clearance between the cell and the wall interior is filled up by cement milk.<BR>After the cement milk has solidified, the resistance variation of the wire strain gauges caused by the stress variation in the coal-seam is measured by the strain meter.<BR>Fig. 1 shows the structure of the load-cell. An active gauge is fixed on the A-surface and a dummy gauge is fixed on the D-surface. Fig. 2 shows the sensitivity of the load-cell buried in a cement mortar column. Fig. 5 is a circuit of the strain meter used. Fig. 8 and 12 both illustrate the site of a longwall and tee location of a load-cell buried in a coal-seam at the beginning of measurement at the Yoshima Coal Mine. Fig. 10 and 13 are the data obtained. Fig. 11 and 14 show the relation between the stress variation in the coal-seam and the distance from the longwall to the location of the load-cell.<BR>According to the results obtaind, one can realize that Fig. 11 is somewhat similar to the concept of stress in a coal-seam advanced by W. Haack and Fig. 14 is similar to the concept suggested by F. Spruth.

収録刊行物

  • 日本鑛業會誌

    日本鑛業會誌 74 (846), 996-1000, 1958

    一般社団法人 資源・素材学会

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