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Floor loading and movement along the coalface

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Summary

Floor Loading and Movement Along the Coalface

Total roof to floor convergence, floor loading, horizontal and vertical movements of floor along three selected longwall faces were investigated. Empirical equations expressing the above noted linearly time-dependent factors in strata mechanics are developed. It was observed that the contribution of floor to the total roof to floor closure is between 31 to 63%, dependent upon the strength of roof and floor layers encountered.

Zusammenfassung

Sohlhebungskraft und Bewegung entlang einer Abbaufront in Kohle

Die gesamte Konvergenz zwischen Firste und Sohle, die Sohlhebungskraft, die horizontalen und vertikalen Bewegungen der Sohle wurden an drei ausgewählten Strebabbauen untersucht. Funktionen, die die Zeitabhängigkeit der oben genannten Größen erfassen, wurden empirisch ermittelt. Es wurde beobachtet, daß der Anteil der Sohlhebung an der gesamten Konvergenz zwischen Firste und Sohle in Abhängigkeit von den Festigkeiten des Hangenden und Liegenden zwischen 31 und 63% beträgt.

Résumé

Mouvements du fond d'une galerie en excavation dans une mine charbonnière

La convergence entre la calotte et le fond de la galerie, l'effet de la force montant le fond, ainsi que les mouvements horizontaux et verticaux du fond ont été étudiés sur trois tronçons d'excavation. Des équations empiriques donnant la relation plus ou moins linéaire ont été développé en fonction du temps pour des milieux stratifiés. On a observé que la contribution du mouvement du fond à la convergence total entre la calotte et le fond de la galerie est entre 31 et 63% en fonction de la résistance de la masse rocheuse au-dessus de la calotte resp. en-dessus du fond.

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References

  1. Shepherd, R.: Measurement of Rock Pressure in Mines, Sheffield Univer. Mining Magazine, P. 72, 17th Nov. (1959).

  2. Schwartz, B., Dubois, R.: The Influence of Supports on the Movement of Roof and Floor in the Face, Proc. 2nd Int. Strata Control Congr. Essen, P 14 (1956).

  3. Dubois, R.: The Various Factors Governing Face Convergence, Proc. 3rd Int. Strata Control Congr. Paris, P. 443 (1960).

  4. Moore, J. F. A.: An Investigation of the Effect of Rate of Face Advance on Strata Behaviour at Bolsover Colliery, NCB, MRE Report No. 2349, Jan. (1969).

  5. Kenny, P., Wilson, A. H.: Strata Measurements on Faces Equipped with Conventional and Powered Supports, The Mining Engineer, P. 528, April (1963).

  6. Wilson, A. H.: Conclusions from Recent Strata Control Measurements Made by the Mining Research Establishment, The Mining Engineer, P. 369–373, April (1964).

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Afrouz, A. Floor loading and movement along the coalface. Rock Mechanics 13, 199–213 (1981). https://doi.org/10.1007/BF01243531

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  • DOI: https://doi.org/10.1007/BF01243531

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