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Characteristics of rock pressure manifestations on reinforced-concrete tubular shields

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Soviet mining science Aims and scope

Conclusions

Investigations have confirmed the principal laws of the effect of rock pressure on shield supports and established the characteristic features of this effect on reinforced-concrete shields. The mean load on a ZhTShch-500 shield is 11.5–13.0 tons/m2, which is 1.3 times greater than the mean loads on timber shield canopies. The overload coefficient of ZhTShch-500 shields is 1.6. Use of the established values in calculations ensures a load-bearing capacity of reinforced-concrete tubular shields equal to 30–35 tons/m2, which should completely eliminate the possibility of failure of the load-bearing members of the canopy.

During shield advance, the load increases to 20–25 tons/m2 and then becomes stable. The appearance of peak loads after a shield advance of 35–40 m is due to caving of the roof. The intensity of loading is affected by the rate of shield advance and the uniformity of its displacement. Longitudinal loads due to displacement of the immediate and main roofs do nothave a marked effect on the deformation of the chief load-bearing elements of reinforced-concrete tubular shields.

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Literature Cited

  1. K. A. Ardashev, “Rock pressure on shields during operation in lower levels in the Kuzbass,” in: Investigations on Rock Pressure and Convergence [in Russian], No. 42, Izd. VNIMI, Leningrad (1961).

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Authors and Affiliations

  1. Institute of Mining, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk, Russia

    V. T. Dzyubenko & L. V. Zvorygin

Authors
  1. V. T. Dzyubenko
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  2. L. V. Zvorygin
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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 106–109, September–October, 1969.

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Dzyubenko, V.T., Zvorygin, L.V. Characteristics of rock pressure manifestations on reinforced-concrete tubular shields. Soviet Mining Science 5, 583–586 (1969). https://doi.org/10.1007/BF02501281

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  • DOI: https://doi.org/10.1007/BF02501281

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