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Determination of the stone and concrete block weight in protective linings of structures subject to wave action

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Hydrotechnical Construction Aims and scope

Conclusions

  1. 1.

    Formulas of different authors for the determination of stone or concrete block weight in slope-type riprapped structures contain different noncomparable safety coefficients. Analysis of experimental conditions permitted establishing the boundaries of limit states, absolute stability and total riprap destruction and obtaining an evaluation criterion for the safety factor.

  2. 2.

    Block stability is determined by two characteristics-distancel from the center of gravity of the element to the possible axis of rotation and angle α0. Stability calculation of different shaped blocks only as a function of these two characteristics showed that the weight decrease of artificial blocks compared with stone weight is the same as in experiments. Wave impact must be considered as the dumped stone destroying force, with a certain phase retard. Insignificant changes in impact pressure with slope angle (pressure decrease in steep slopes is partially compensated with the downslope velocity increase) permit considering that destructive forces do not depend on the slope angle.

  3. 3.

    From the stability equation My=Mo, a stone-weight formula was derived including in its general form three coefficients which can be obtained by calculation and an impact pressure transmission coefficient which is determined experimentally.

  4. 4.

    Numerical coefficients obtained by calculation determine the order of magnitudes. Introducing a safety factor K≈1.5,f(α) according to formula (20) it lies on the border of the absolute stability zone. This gives a certain assurance of safety in the stone and block weight determination for all slope angles between 15° and 45°.

  5. 5.

    The formula for determining the necessary block weight will have the final form:

    where K is the safety factor 1.5 (according to p. 7.24 SN 288-64).

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Literature Cited

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  1. G. G. Metelitsyna
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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 5, pp. 38–43, May, 1967.

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Metelitsyna, G.G. Determination of the stone and concrete block weight in protective linings of structures subject to wave action. Hydrotechnical Construction 1, 457–464 (1967). https://doi.org/10.1007/BF02382694

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