Deformation control techniques for 200 m-high Hongjiadu Concrete Face Rockfill Dam

With regard to the existing problems in 200 m-high concrete face rockfill dams(CFRD) and combined with the characteristics of Hongjiadu CFRD project,a study was performed on the deformation characteristics and the deformation control techniques for the dam body.The rules and characteristics of about 200 m-high CFRD were discussed.The dam deformation could be controlled through the optimal choice of rockfill materials,reasonable division of structural zone of rockfill and right rockfill compaction construction.Integrated techniques of CFRD deformation control were brought forward,such as the quantity index for controlling rockfill pre-settlement,the high compaction degree of rockfill,the shaping of steep abutment and the filling of rockfill with higher modulus near the steep abutment and the filling of dam for small height differemce as possible.Some goals as small dam deformation,no structural cracks and little seepage through the dam were achieved by adopting the above integrated CFRD deformation control techniques.