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首页> 外文会议>Collaborative management of integrated watersheds >ALKALI-SILICA REACTIVITY AT ROANOKE RAPIDS DAM UNIQUE REMEDIAL DESIGN CHALLENGES
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ALKALI-SILICA REACTIVITY AT ROANOKE RAPIDS DAM UNIQUE REMEDIAL DESIGN CHALLENGES

机译：ROANOKE大坝独特的补救设计挑战对碱-硅的反应能力

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Roanoke Rapids Dam is a 72-foot high, 3,050-foot long concrete gravity dam with four 26MW power generating units located on the Roanoke River in North Carolina. The dam was constructed in 1955 and has performed satisfactorily for most of its life.rnThe dam has been regularly monitored for seepage, piezometric pressures at the foundation contact, and upstream-downstream deformation for 25 years. The South Non-Overflow Section (SNOS) of the dam is approximately 581 feet long and was designed with an upstream curving south abutment. Recent instrumentation history indicated accelerated deformation, increased seepage, and increases in uplift pressure in the SNOS. These changes led to a two-phased investigative program performed by Gannett Fleming, Inc. from 2006-2008.rnThe investigation discovered significant cracking along several monoliths of the upstream face of the curved portion of the SNOS and concluded that the dam was experiencing concrete growth due to Alkali-Silica Reactivity (ASR). The unique curved geometry of the SNOS south abutment contributed to the observed distress. The partial sections of the affected monoliths above the cracking were determined to be unstable during the design flood (PMF). Low pressure grouting of the cracks and installing high-capacity, post-tensioned anchors in selected SNOS monoliths to improve the long-term stability were the recommended remedial solutions.rnHDR/DTA, Inc. was contracted by Dominion to perform detailed engineering for the crack grouting and anchoring systems. This paper provides a review of the project, instrumentation history, and investigation program, and describes the unique challenges and aspects of the crack grouting and anchor engineering/design to manage future concrete growth of the structure due to continuing ASR.
机译：罗阿诺克急流大坝是一座72英尺高，3,050英尺长的混凝土重力坝，在北卡罗来纳州的罗阿诺克河上拥有四个26兆瓦的发电机组。该大坝建于1955年，在其大部分使用寿命中均表现令人满意。rn对该坝进行了25年的定期监测，包括渗流，地基接触处的压力压力以及上游-下游变形。大坝的南部非溢流段（SNOS）约581英尺长，设计成上游弯曲的南基台。最近的仪器历史表明，SNOS中加速变形，增加了渗流，并增加了上升压力。这些变化导致了Gannett Fleming，Inc.在2006年至2008年执行的两阶段调查计划。研究发现SNOS弧形部分上游面的几块整体发生了明显开裂，并得出结论说该大坝正在经历混凝土的生长。由于碱-二氧化硅反应性（ASR）。 SNOS南基台独特的弯曲几何形状助长了观察到的困扰。确定在设计洪水（PMF）期间，裂纹上方受影响的整料的局部截面是不稳定的。推荐的补救方案是对裂缝进行低压灌浆，并在选定的SNOS整料中安装高容量，后张锚固以提高长期稳定性。Dominion与rnHDR / DTA，Inc.签订合同，对裂缝进行详细的工程设计灌浆和锚固系统。本文提供了对项目，仪器历史和研究计划的回顾，并描述了裂缝注浆和锚固工程/设计面临的独特挑战和方面，以管理由于持续的ASR而导致结构未来的混凝土增长。

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