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Stability and Rehabilitation of 'Smaller' Gravity Dams

机译:“ Smaller”重力坝的稳定性和修复

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For many, the terms "gravity dam" and "concrete dam" conjure images of large structures, such as the Hoover and Grand Coulee dams. However, most masonry and concrete gravity dams in the U.S. are much smaller structures. According to the National Inventory of Dams, 90 percent of gravity dams categorized as high or significant hazard structures are less than 100 feet tall.1Design features common to large gravity dams often are not incorporated into these smaller structures. For example, many smaller dams do not include foundation drainage systems. In addition, large dams in steep canyons typically are keyed into bedrock at the abutments, while for smaller structures the non-overflow sections may only extend a limited distance beyond the original ground surface and many times are not abutted into sound rock.
机译:对于许多人来说,“重力坝”和“混凝土坝”这两个词会让人联想到大型结构的图像,例如胡佛和库里大坝。但是,在美国,大多数砖石和混凝土重力坝的结构要小得多。根据《国家水坝清单》,被归类为高危或重大灾害结构的重力坝中有90%的高度不到100英尺。1大型重力坝共有的设计特征通常并未纳入这些较小的结构中。例如,许多较小的水坝不包括基础排水系统。此外,陡峭峡谷中的大型水坝通常在基台处被锁入基岩,而对于较小的结构,非溢流段仅会延伸超出原始地面有限的距离,而且很多时候都不会与健全的岩石邻接。

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