Abstract：Two types of joints，the rigid joint and the flexible joint，between toe slab and foundation of the concrete-faced rockfill dam(CFRD) of the Nalan Hydropower Power Station are analyzed by 3D elastoplastic finite element method. Numerical results show that the joint types make small difference to stress-strain behavior of dam，dam foundation and face slab，and they have no obvious influence on stress behavior of toe slab and diaphragm wall，but obvious influence on deformation behavior of toe slab and diaphragm wall. The deformations of toe slab and diaphragm wall in the rigid joint are smaller than the flexible joint. The results of the rigid joint show that deformations of facing joint are quite big，even exceed the deformation capacity of common sealing structure. The flexible joint is recommended based on this numerical analysis.
