Deformation Characteristics and Control Techniques at the Shiziping Earth Core Rockfill Dam

Abstract

This paper presents a representative engineering case, the Shiziping dam, to illustrate deformation controls of highrise earth core rockfill dams in seismic areas. Techniques for controlling dam deformation, including structure design, foundation treatment, material properties, and construction are discussed in detail. Field monitoring data and deformation characteristics were reviewed to verify control effectiveness. The deformation during the construction and initial impoundment period accounted for 70–85% of the overall deformation; the deformation was primarily influenced by weight, wetting behavior, and creep. Creep stabilized 7 or 8 months after the completion of construction. The total deformation is caused by fill and foundation materials. Uneven deformation is mainly caused by foundation shape, foundation compression symmetry, and uniformity of fill materials. Uneven deformation may be improved by using reasonable dam zone and fill material designs and appropriately increasing core wall compaction.