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REBUILDING AN EMBANKMENT DAM AT A SINKHOLE

机译：在新孔重建路堤

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摘要

Chilhowee Dam is an 85 foot high, 1,500 foot long hydropower development located near Knoxville, Tennessee. A 6 foot deep sinkhole was observed on the upstream slope of one of the two rockfill embankment sections in February 2000. Geotechnical subsurface investigations confirmed that the embankment material near the sinkhole was of questionable condition, but were unable to determine the cause of the sinkhole. It was decided that the affected area would be excavated and rebuilt to address the safety concern of the growing sinkhole.rnConstruction began with excavation of the embankment area to determine the cause, and ensure the removal, of the observed sinkhole. Several deficiencies were noted during the excavation, and the plan for the rebuild was modified to remedy these problems.rnStrict quality control was maintained during embankment material placement to ensure that filter compatibility was maintained over all new and existing embankment materials. Material quality, handling, placement and compaction was regulated to ensure that the rebuilt section would function properly and not be prone to similar sinkhole mechanisms.rnThe paper focuses on issues inherent with excavating and rebuilding a portion of an embankment dam with sloping impervious clay core bounded by a series of filters, while maintaining dam safety. The rebuild presented challenges, due to the relative uncertainty of what the initial excavation would reveal and the complexity of the dam's geometry. Through removing the affected portion, remediating improper rock foundation treatment and rebuilding the embankment, the embankment section that contained the sinkhole was properly replaced.
机译：Chilhowee大坝是一座85英尺高，1,500英尺长的水电开发项目，位于田纳西州诺克斯维尔附近。 2000年2月，在两个堆石路堤路段之一的上游斜坡上观察到一个6英尺深的下沉孔。岩土地下调查证实，下沉孔附近的路堤材料状况可疑，但无法确定下沉原因。决定对受影响的区域进行开挖和重建，以解决不断扩大的下沉坑的安全问题。施工始于对路堤区域的开挖，以确定原因并确保将下沉的下沉坑清除。在开挖过程中发现了一些不足之处，并修改了修复计划以解决这些问题。在路堤材料放置期间保持严格的质量控制，以确保在所有新的和现有路堤材料上保持过滤器兼容性。对材料的质量，处理，放置和压实进行了规定，以确保重建后的部分能够正常运行，并且不易于出现类似的下沉机制。本文着重探讨了以倾斜的不透水粘土心为界的堤坝的开挖和重建所固有的问题。通过一系列过滤器，同时保持大坝安全。由于初始开挖所揭示的内容相对不确定以及大坝几何形状的复杂性，重建带来了挑战。通过去除受影响的部分，补救不当的岩石基础处理和重建路堤，适当地更换了包含污水坑的路堤部分。

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  • 会议地点 Sacramento CA(US)
  • 作者

    John Lyon; rnRay Barham; rnPaul Shiers; rnKevin Finn; rnBryce Mochrie;

  • 作者单位

    Federal Energy Regulatory Commission, 3700 Crestwood Pkwy, Duluth, GA 30096;

    rnAlcoa Power Generation Inc., Tapoco Division, 300 North Hall Road @ Mail Stop T1521 Knoxville, TN 37701;

    rnPB Americas, Inc., 75 Arlington St. Boston, MA 02116;

    rnPB Americas, Inc., 75 Arlington St. Boston, MA 02116;

    rnPB Americas, Inc., 75 Arlington St. Boston, MA 02116;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 挡水坝;
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