Abstract：Limited by the topography and geological condition，the main dam of the up-reservoir of Yixing pumped-storage power station has to be located on a slope. The main dam is a combination of a rockfill dam and a high concrete gravity retaining wall(45.9 m)，which are very seldom seen nowadays in the world. How to maintain the safety of the high concrete gravity retaining wall on the slope under the great thrust caused by the rockfill of the dam is a hot issue. According to the monitoring data and the 3D FE numerical analysis，the value and the development law of the pressure of rockfill on the back of retaining wall can be obtained，and also the location and direction of the pressures on three typical sections. The location of the action point of resultant is at 40%–45% of the wall height，which verifies the Terzaghi¢s viewpoint that the location of the force point is not at one-third of the wall height，but is about at 40% of the wall height. On these basis，the safety factor of the concrete retaining wall under the running condition is analyzed，so as to evaluate the anti-slide and anti-inclination ability stability of the high concrete gravity retaining wall.
