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Mechanism of failure of fractured block masses under the effect of a high-velocity flow

  • Engineering Calculations and Production Efficiency
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Hydrotechnical Construction Aims and scope

Conclusion

  1. 1.

    For blocks (slabs) with a smooth surface laid flush with the bottom, under the effect of a high-velocity flow with a uniform motion on them, the mean uplift is equal to zero.

  2. 2.

    Under the effect of a fluctuating load, the block rises to a small height, which leads to a substantial increase of the mean dislodging load, primarily due to an increase of pressure on the bottom of the block.

  3. 3.

    In the case of rock bed, when the sizes of the projections of the natural roughness are an order of magnitude and more greater than the height of uplift of the separate elements under the effect of the fluctuating load, the effect of the latter on dislodging a separate element is felt primarily on rupturing the bonds between adjacent blocks, and the main role in dislodging the separate elements is played by the mean uplift.

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Literature cited

  1. G. L. Rubinshtein, “Laboratory investigations of the fracture of rocks in the lower pools of high overflow dams,” in: Transactions of Joint Conferences on Hydraulic Engineering [in Russian], VNIIG im. B. E. Vedeneeva, No. 7 (1963).

  2. G. A. Yuditskii, “Force effect of the nappe on separate elements of a rock foundation and conditions of its failure,” Izv. VNIIG im. B. E. Vedeneeva,72, (1973).

  3. V. V. Bukhanov, “Dynamic interaction of revetment slabs of the lower pool with the subslab region,” Izv. im. B. E. Vedeneeva,105 (1974).

  4. Sh. N. Gagashidze, “Calculation of the excess hydrodynamic uplift in a fractured rock foundations having a block structure,” in: Hydrotechnical Construction and Problems of Power Engineering in Mountains [in Russian], Énergoizdat, Moscow (1981).

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  7. Yu. G. Zharkov, “Mechanisms of fracture of a rock bed by a nappe,” in: Collection of Scientific Papers, Izv. VNIIG im. B. E. Vedeneeva,179 (1985).

  8. Yu. G. Zharkov, “Failure of fractured block masses under the effect of mean and fluctuating loads,” in: Collection of Scientific Papers, Izv. VNIIG im. B. E. Vedeneeva,208 (1988).

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Authors
  1. Yu. G. Zharkov
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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 4, pp. 37–41, April, 1990.

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Zharkov, Y.G. Mechanism of failure of fractured block masses under the effect of a high-velocity flow. Hydrotechnical Construction 24, 270–276 (1990). https://doi.org/10.1007/BF01428213

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  • DOI: https://doi.org/10.1007/BF01428213

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