Calculation of the stress-strain state of earth structures weakened by low-strength interlayers: Fid-Bau Portal

Calculation of the stress-strain state of earth structures weakened by low-strength interlayers

Skopetskii, V. V. / Deineka, V. S. / Rybachishin, S. I.

Conclusion By means of the proposed method it is possible to investigate the stress-strain state of natural slopes, underground workings, structures containing low-strength and melting ice inclusions, extended cracks, and other objects weakened both by long and short inclusions.The effect on the SSS of the structure of the coefficient of shear rigidity of the interlayer for various locations of the inclusion and its various operating conditions was analyzed in the work.Both the coefficient of shear rigidity of the interlayerr and the operating regimes of the structure have a substantial effect on the SSS of earth structures.Even under the effect of only the gravitational force, the presence of a low-strength interlayer qualitatively and quantitatively affects the SSS of the structure. In turn, a short inclusion on the upstream pool side leads to a still greater increase of displacements above the interlayer toward the upper pool. The presence of a hydrostatic surface load for the left short inclusion leads to the formation of stress concentration on its right end. For a long inclusion the formation of a zone of tensile stresses above the interlayer is observed near the left foundation of the dam during filling of the pool. The presence of a long interlayer leads to an increase of settlement of the dam crest. In all operating regimes of the structure, a discontinuity of the fields of displacementsUx, components of the stress tensorσx, and other characteristics occurs along the low-strength inclusion.