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The behavior of a roof composed of monolithic rocks

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Conclusions

  1. 1.

    The main difference between the behavior of sedimentary and that of igneous rocks is that the former tend to form layers and cave in relatively thin layers or groups of layers. Igneous rocks, on the otherhand, cave in large monolithic blocks, and it is therefore necessary to take account of the thickness of the caved rock in rock pressure calculations.

  2. 2.

    The depth of the influence of flowrocks depends on their thickness and the strength of the immediate-roof rock; if the thickness of the igneous rocks is hb=50 m, the safe depth lies 120–150 m below the basalts.

  3. 3.

    If thick monolithic rock lies above a deposit, it is necessary to first work a seam lying at a safe distance from them; only after breakup of the monolithic rocks into blocks can one go on to work the higher seams.

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Literature Cited

  1. S. G. Avershin, Shock Bumps [in Russian], Ugletekhizdat, Moscow (1955).

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  2. V. T. Davidyants and G. L. Kozelev, Investigation of Rock Pressure Phenomena in Extraction Faces with New Types of Supports [in Russian], Gosgortekhizdat, Moscow (1960).

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  3. V. G. Koshomkin, Study of Rock Pressure Phenomena in Layers beneath Volcanic Rocks [in Russian], Izv. Vuzov, Gorn. Zh., No. 2 (1966).

  4. V. G. Koshomkin, Behavior of the Back in Working Coal Beds beneath Volcanic Rocks [in Russian], Zap. Lenin Gos. Univ., Issue 1, Nedra, Leningrad (1966).

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Authors
  1. V. G. Koshomkin
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Additional information

V. V. Kuibyshev Far-Eastern Polytechnic Institute. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 115–117, January–February, 1969.

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Koshomkin, V.G. The behavior of a roof composed of monolithic rocks. Soviet Mining Science 5, 90–91 (1969). https://doi.org/10.1007/BF02501716

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  • DOI: https://doi.org/10.1007/BF02501716

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