| The GUANDI hydropower plant on the ground floor were installed capacity of 600MW stand-alone 4 of the hydro-generating unit, The total installed capacity of 2400MW。Plant width of the main excavation reached 31.1m, high-76.8m。Belong to the large-span, high wall underground powerhouse。Surrounding the main underground powerhouse for the ClassⅡ, there are better conditions to excavation. According to expose the tunnel into the plant, Underground powerhouse located in the slope with stress concentration (close to bring pressure) or less, to a higher level of stress. According to monitoring data show that the underground powerhouse in the vault wall displacement monitoring data arising from the displacement of plus or minus change in the turn.1) the use of numerical simulation software FLAC3D study of the underground powerhouse rock arch in a different side of the pressure coefficientγunder the stress of displacement and change in trend, as well as the high-pressure side of the wall in a different coefficient ofγunder the wall displacement and stress Changes in the trend. At the same time on the dome cavern wall of the existence of stress concentration was confirmed.2) The article also FLAC3D the use of numerical simulation software to study the different methods of excavation of the cavern wall stress and displacement affected by the excavation. At the same time, take into account the different rock types of cases and different methods of excavation of the surrounding rock to the stress and displacement.3) In this paper, the use of FISH to the programming language model for calculating the volume of plastic, plastic volume reached with the excavation curve. |
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