Open AccessAssessment of the safety of Rogun HPP dam in case of seismic impacts
Author(s) -
V. V. Orekhov,
Г. В. Алексеев
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/869/7/072006
Subject(s) - induced seismicity , geotechnical engineering , consolidation (business) , finite element method , geology , structural engineering , seismology , engineering , accounting , business
The article considers the problem statement and the results of numerical studies of the formation of the stress-strain state of the rock-earthfill dam of the Rogun HPP under seismic impacts. In this case, the static stress-strain state of the dam is considered as the initial state. The purpose of this work is to assess the seismic stability of an ultra-high dam being built in a mountainous area with high seismicity. To study the stress-strain state of a rock-earthfill dam, we used a method based on the finite element solution of a system of differential equations for the dynamic theory of consolidation of quasi-two-phase ground media. To describe the nonlinear deformability of soil materials composing the body of the dam, we used a mathematical model formed in the framework of the theory of plastic flow with hardening. The calculations were performed in a spatial setting, taking into account the speed of propagation of the impact in the rock base. Packages of 3-component accelerograms synthesized for dam construction conditions were used as seismic effects in the calculations. To assess the safety of the rock-earth dam in case of seismic impacts, a calculation was made for the most dangerous impact when the strength characteristics of the dam body materials were reduced by 1.08. As shown by the results of the calculations in this case, after seismic excitation is not observed the appearance in the body of the dam areas of marginal soil conditions, the value of the total reserve coefficient is greater than the minimum standard value for a special combination of loads and seismic stability of the rock-earthfill dam is provided.