Abstract:

In order to overcome the limitations of the fractured rock mass deterministic analysis methods, the evaluation of joints and fissures safety stability of the gravity dam was put forth by using the finite element strength reduction method. The 2 D and 3 D random joint fracture network model were generated by Monte-Carlo method, which could reduce the real distribution of joints and fissures. For the two cases of gravity dams that only with soft rock strata and with soft rock strata and rock joints, the strength reduction method was used to comparatively analyze the plastic zone and the horizontal displacement. The analysis results showed that the plastic zone of the gravity dam with joints within the foundation was more, the local damage became serious  and the horizontal displacement of dam became relatively large. Research results could provide a reference for the study on safety and stability of underground engineering of fractured rock mass.

Key words: fractured rock mass, strength reduction method, Monte-Carlo method, gravity dam