Abstract
This study proposes a simple method to evaluate the stability of dam foundation during earthquake in consideration of rock joints. The proposed method consists of evaluation methods for the stability against the failure caused by local shear and global sliding along joint sets in foundation rock for an arch dam. A case study using the existing earthquake analysis result based on continuum model of a typical arch dam is carried out. The results of the case study show that the proposed method is capable to quantitatively evaluate the stability against the shear failure in the foundation rock, the orientations and the shear strength properties of joint sets have significant effects on the shear failure in the foundation rock.
