Abstract
CSG dams, which combine the characteristics of both gravity and rockfill dams, have traditionally been evaluated for seismic failure only in terms of tensile failure mode, similar to concrete gravity dams. However, recent studies have indicated that CSG dams may also be vulnerable to slope instability during earthquakes, which has not been sufficiently investigated. This study proposed a method to evaluate the seismic slope stability of CSG dams, which considered the impact of seismic tension cracks. In addition, an initial population strategy for the genetic algorithm (GA) was proposed to improve the process of seismic stability analysis of CSG dams. Using a 100 m high CSG dam as a case study, the seismic slope stability of CSG dams was studied under different ground motions with the proposed method. The results show that there is a potential risk of instability when the ground motion intensity reaches a certain level and the most dangerous slip surface could develop along the seismic tension crack on upstream dam surface. Additionally, the results also indicates that the proposed initial population strategy of GA can improve both efficiency and accuracy of stability analysis for CSG dams.
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