Preliminary statistical analysis of behavior of concrete face rockfill dams

The concrete face rockfill dam (CFRD) has become a preferred dam type, yet its design is still largely based on the past experience. However, few studies have been conducted on the behavior of CFRDs on the basis of reliable case history data. A compendium of monitoring records and construction details of 87 case histories of in-service CFRDs constructed in the past 50 years is collected for analyzing the behavior of CFRD from the perspective of statistical analysis. The post-construction crest settlement, deflection and stress of face slab and the maximum settlement at completion time are analyzed. The effects of intact rockfill strength, foundation characteristics, valley shape and seepage flow on behavior of dams are discussed. A summary of the findings from the case histories is put forwrd to enhance the understanding of behavior of CFRDs. These results may help guide the design, construction and operation of CFRDs.