Abstract: Bearing capacity and anti-deformation ability of rock mass in the foundation of high arch dam must be fulfilled to design requirement , because water volume impounded by the dam is giant. But excavation on a large scale at the foundation will be harmful to stability of high slopes at the upstream and downstream of dam foundation , as well as stress relaxation of rock mass due to high geostress. Based on the comparison of the standard requirements of foundation surface at home and abroad, we analyzed the determination for dam foundation surface of the highest dam, Jinping arch dam, and summarized some new viewpoints as follows1)in premise of reliable measures for foundation treatment ,we can reduce the quality requirements of rock mass in specific projects; 2) we can increase the thickness of arch dam and decrease the stress of arch dam to reduce the load of rock mass in the foundation; 3) transversal anchor locking imposed in the resistance body region at the downstream of arch dam can improve the bearing capacity of rock mass in the foundation.

Key words: high arch dam, rock mass in the foundation, bearing capacity, anti-deformation ability, treatment measures