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Influence of seismic spectrum on damage evolution of surrounding rock of large underground cavern

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Document pages: 13 pages

Abstract: In order to explore the distribution and evolution law of surrounding rock of underground cavern of hydropower station, dynamic compression tests were carried out on granite samples. According to the static elastic-plastic damage constitutive relationship based on strain, a dynamic constitutive relationship suitable for computer programming was established. Using the explicit difference method and inputting five earthquakes with different frequency spectra, the full nonlinear dynamic analysis of some large underground caverns in the canyon mountain area of Sichuan Province is carried out. The simulation results show that the damage zone generally extends upward from the middle of the side wall with the gradual enhancement of the input seismic wave. The damaged area reaches the maximum value in area imediately after the seismic acceleration peak arrives and keeps constant thereafter. According to the initial analysis, if the dominant frequency of input wave approaches the natural frequency of underground caverns, the maximum area of damage zone will increase. Those findings may provide practical data for earthquake-resistant design and construction.

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