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首页> 外文会议>Association of State Dam Safety Officials, Inc. 2002 Annual Conference Sep 8-11, 2002 Tampa, Florida >DRAKE LAKE DAM - A CASE HISTORY
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DRAKE LAKE DAM - A CASE HISTORY

机译：大坝湖-案例历史

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摘要

Drake Lake Dam was constructed during the summer of 2000 as part of the development of the Jim Edgar/Panther Creek State Fish and Wildlife Area in Cass County, Illinois. The earthen dam on a natural soil foundation has a length of 450 feet and a height of 45 feet with 3H:1V upstream and downstream slopes. The dam has a principal spillway structure consisting of a cast-in-place concrete drop inlet tower, a 36-inch reinforced concrete pipe (RCP) outlet pipe, and an impact-basin type energy dissipater/outlet structure. Construction of the earthen embankment began in July and ended in September. During the latter stages of construction, observed and measurable distress of the dam was detected in the inlet tower and RCP outlet pipe. The movement measured in the principal spillway intake tower and the 36-inch RCP was the result of lateral spreading and vertical cracks in the embankment dam, both in the downstream and upstream direction due to rapid embankment filling over the soft, silty clay foundation soils. Redesign of the dam structure was required to account for these unexpected site conditions. The following remedial actions were undertaken: 1. A 3-foot impervious compacted clay blanket was constructed on the upstream face of the dam to reduce seepage through the dam. 2. A granular filter blanket was constructed, at the downstream toe of the dam, to intercept embankment and foundation seepage. 3. The 3-foot RCP spillway pipe was lined with a flexible, high-density polyethylene (HDPE) pipe insert, since the pipe joints had separated. 4. Joint separations were repaired prior to placement of the HDPE pipe and grout anti-seepage collars were installed between the intake structure and outlet pipe filter. 5. Cracks within the spillway intake tower were repaired. 6. Instrumentation and surveying was utilized to monitor the performance of the dam during reservoir filling.
机译：德雷克湖水坝于2000年夏季建成，是伊利诺伊州卡斯县Jim Edgar / Panther Creek国家鱼类和野生动物保护区发展的一部分。天然土壤基础上的土坝长450英尺，高45英尺，上游和下游坡度为3H：1V。大坝的主要溢洪道结构由现浇混凝土落水进口塔，36英寸钢筋混凝土管（RCP）出口管和冲击盆式消能/出口结构组成。土堤的建设始于7月，至9月结束。在施工的后期阶段，在进口塔和RCP出口管中检测到了可测量的大坝应力。在主要溢洪道进水塔和36英寸RCP中测得的运动是在堤坝下游和上游方向上横向扩展和垂直裂缝的结果，这是由于在软质粉质粘土基础土壤上快速筑堤所致。需要对大坝结构进行重新设计，以解决这些意外的现场条件。采取了以下补救措施：1.在大坝的上游面建造了一个3英尺不透水的压实的粘土毯，以减少通过大坝的渗漏。 2.在大坝的下游脚趾处建造了颗粒状的滤布，以拦截路堤和基础渗流。 3. 3英尺的RCP溢洪道管道衬有柔性的高密度聚乙烯（HDPE）管道插入件，因为管道接头已分离。 4.在放置HDPE管道之前，先修复接头分离，并在进水结构和出水管过滤器之间安装灌浆防渗环。 5.修复溢洪道进水塔内的裂缝。 6.利用仪器和勘测来监测水库充水期间大坝的性能。

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