Conclusions
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1.
The chamber walls are stable under static loads. The horizontal displacements of the rock walls of the chamber, which during the period from April 1975 through September 1976 reached a maximum value of 15 mm, are diminishing with time and indicate pressure release of the rock mass due to excavating the chamber cavity. Additional support is not required. The analysis and the character of the displacements based on the available data do not give grounds to assume disturbance of the stability of individual large rock blocks in the chamber walls. The 1977 data indicate stabilization of the wall deformations and confirm the correctness of the conclusions made.
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2.
It is necessary to continue regular observations of the deformations of the anchors during operation of the pumped-storage plant units for checking the stability of the chamber walls under the effect of dynamic loads.
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Literature cited
V. M. Mostkov, Large Underground Structures [in Russian], Nedra, Moscow (1974).
I. I. Grossman, “Stability of underground workings with anchor and Gunite support,” Energ. Stroit., No. 7 (1978).
É. G. Gaziev, Stability of Rock Masses and Methods of Supporting Them [in Russian], Stroiizdat, Moscow (1977).
Additional information
Translated from Gidrotekhnicheskoe Stroitel’stvo, No. 9, pp. 23–37, September, 1978.
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Mostkov, V.M., Vinogradov, Y.N. & Gaziev, É.G. Deformation of the walls of an underground generator room for a pumped-storage plant during construction. Hydrotechnical Construction 12, 892–897 (1978). https://doi.org/10.1007/BF02322086
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DOI: https://doi.org/10.1007/BF02322086