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首页> 外文会议>Collaborative management of integrated watersheds >HOWARD HANSON DAM RIGHT ABUTMENT SEEPAGE PERFORMANCE ISSUES AND INTERIM REPAIRS
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HOWARD HANSON DAM RIGHT ABUTMENT SEEPAGE PERFORMANCE ISSUES AND INTERIM REPAIRS

机译：HOWARD HANSON DAM右补胎渗漏性能问题和临时维修

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Howard A Hanson Dam (HHD) on the Green River in Washington State has had a history of excessive seepage through the right abutment for pool elevations above 1,155 feet. A record pool (elevation 1,188.8 feet) was held on 9 January 2009. During the post flood drawdown, symptoms indicative of potential piping/internal erosion within the dam's right abutment were observed including: turbid water discharge from vertical drain 25 in the right abutment drainage tunnel, two depressions formed on the upstream face of the right abutment, and three piezometers in a critical short path seepage area measured excessively high water levels relative to responses measured during past flood events. Dye was placed into the larger of the two depressions as the flood pool receded, and the dye exited 460 feet downstream from a tunnel drain in approximately 5 hours. In response to these symptoms, the U.S. Army Corps of Engineers (USACE) Dam Safety Action Class rating for the dam was revised from a 'II' (potentially unsafe) to a 'I' (unsafe), and actions were taken to investigate and mitigate the potential piping/internal erosion failure mode including: depression excavation, exploration drilling, installation of additional piezometers, and enhanced monitoring and dye testing during the summer conservation pool (elevation 1,169 feet). Contracts for a double row grout curtain extending along the right abutment 450 feet from the dam embankment and the installation of additional drains within the existing drain tunnel were awarded to be completed by 1 November 2009 to provide interim risk reduction during subsequent flood seasons until a permanent repair is implemented as determined by a dam safety modification study.
机译：华盛顿州格林河上的霍华德汉森水坝（HHD）曾经有过右岸超过1155英尺高的水池高渗的历史。 2009年1月9日举行了一个记录池（海拔1,188.8英尺）。在洪水后撤退期间，观察到表明大坝右基台内部潜在管道/内部侵蚀的症状，包括：右基台排水中的垂直排水口25出现浑浊的水排放。隧道，右基台上游面上形成的两个凹陷处以及临界短程渗流区中的三个压力计测得的水位相对于过去洪水事件中的响应而言过高。随着洪水池的退缩，染料被放入两个凹陷中较大的一个，染料在大约5小时内从隧道排水口向下游460英尺处排出。针对这些症状，美国陆军工程兵团（USACE）将大坝的安全行动等级从“ II”（可能不安全）修订为“ I”（不安全），并采取了行动进行调查和评估。减轻潜在的管道/内部侵蚀破坏模式，包括：凹陷开挖，勘探钻探，安装额外的压力计，以及在夏季保护池（海拔1,169英尺）内加强监测和染料测试。一条双排灌浆帘幕的合同沿着大坝路堤向右延伸450英尺，并在现有排水隧道中安装了额外的排水沟，这些合同已于2009年11月1日完成，以在随后的洪水季节中减少临时风险，直至永久性大坝安全性修改研究确定要进行维修。

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