Study On The Influence Of Slope-compaction Size On The Three-Dimensional Seismic Response Of Concrete Face Rockfill Dam

Concrete face rockfill dam(CFRD)has many advantages of engineering adaptability and is widely used in dam construction all over the world.The dam construction sites in China are located in the western region where water resources are abundant,but the geological conditions in the western region are complex and the earthquake intensity is high.Therefore,in order to construct CFRD in such a complex seismic area,we must fully understand and understand the seismic characteristics of CFRD.Based on the engineering background of a planned concrete face rockfill dam for a pumped storage power station,this paper studies the influence of different scale slope-compaction on the static water storage and seismic dynamic response of the concrete face rockfill dam,and verifi es the rationality of the slope-compaction body formed by accumulating excavated slag behind the dam from the seismic point of view,in order to provide a basis for further optimizing the design of the dam structure.The main conclusions are as follows.(1)When different sizes of dam backfill slope are built,the stress-displacement distribution law of dam compaction under static and dynamic state is consistent with that of traditional face rockfill dam,and the regularity is good.It shows that the design scheme of forming dam backfill slope-compaction by accumulating excavated slag behind dam is reasonable.(2)When there is a slope-compaction,the displacement of the dam increases,but the increment of displacement caused by water pressure decreases.Meanwhile,the press stress of the dam increases.However,the above changes are not obvious with the width of the slope,but obvious with the increase of the height of the slope.It shows that the dam body becomes more compact and compact under the action of slope-compaction.On the other hand,the stiffness of the whole structure increases compared with that of the unconfined slope-compaction,so the deformation of the dam body caused by external force will decrease,and the effect will be more significant with the increase of the scale of the slope-compacting body.And under the dynamic action,the existence of the slope-compaction makes the dynamic response of the dam decrease obviously,and the width of the slope-compaction.The higher the height,the more obvious the effect.(3)With the increase of modulus parameters of the compacted slope,the displacement and stress of the dam remain basically unchanged,and the displacement of the slope-compaction decreases.With the increase of the volume weight of the slope-compaction,the displacement along the river,across the river and vertical direction of the dam body increases,and the maximum press stress of the dam increases to a certain extent,but the increase is small,while the displacement of the slope-compaction increases.(4)Comparing the calculation results of different scale face rockfill dams,it can be found that the stiffness of the whole structure increases and the ability of resisting deformation under static state increases with the establishment of a certain scale of pressure slope-compaction.Moreover,the dynamic response of the dam under seismic dynamic load is significantly weaker than that without pressure slope-compaction,which changes with the increase of the width and height of pressure slope-compaction more obvious.