Abstract
General seismic damage surrounding underground excavations of jointed rock masses is closely associated with the presence and response of discrete fracture networks. As the failure of rock masses is mainly controlled by joints, energy dissipated through slippage along joints is proposed as an evaluation index for dynamic stability analysis of underground caverns. Energy dissipated in slippage is represented as a product of the shear stress and plastic shear displacement. The method was demonstrated through dynamic analysis of an underground cavern containing joints of varying dip friction angle and location. The results show that the proposed index can record the failure history and damage of rock structures surrounding an underground cavern subjected to dynamic loading. The effects of four types of joint sets on the dynamic stability of a cavern in the DaGangshan hydropower project were assessed using the friction energy of the joints. The combination of steep and non-steep joint sets was found to be much more unfavorable to large caverns than joints sets of only steep dip angle or non-steep dip angle.
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