Research on the Stability and Support Measures of the Surrounding Rock of Large-scale Underground Powerhouse
In order to study the surrounding rock stability problems and the effect of different support measures in the excavation process of large-span,high sidewall underground powerhouse,this paper takes a large hydropower station project in Southwest China as an example,and uses the three-dimensional nonlinear finite element method to analyze the surrounding rock stability of underground powerhouse.The three-dimensional geologic model is established,and the deformation of surrounding rock of underground powerhouse,the change of stress and the distribution law of plastic zone under different support conditions are compared.The results show that,(a)the top arch,bottom plate and corners of the chamber are prone to stress concentration phenomenon,and there is a risk of plastic damage in the blocks cut out of the excavated surface of the chamber;(b)compared with the excavation without support measures,the deformation amount,stress concentration phenomenon and plastic zone distribution of the underground powerhouse after taking support measures are all reduced to different degrees;and(c)the support of sprayed concrete layer+anchor+prestressed anchor cable system has the most significant effect,which is better than that of anchor+prestressed anchor cable support and sprayed concrete layer support in controlling the deformation and damage of surrounding rock.
underground powerhousesurrounding rock stabilitysupport measuresdeformationstress concentrationplastic damagefinite element method
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