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首页> 外文会议>Dam safety 2009 >ABRUPT EROSION OF DISPERSIVE EARTHFILL MATERIAL REQUIRINGEMERGENCY REPAIR OF A SMALL WATERSHED DAM IN FRANKLINCOUNTY, ARKANSAS
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ABRUPT EROSION OF DISPERSIVE EARTHFILL MATERIAL REQUIRINGEMERGENCY REPAIR OF A SMALL WATERSHED DAM IN FRANKLINCOUNTY, ARKANSAS

机译：阿肯色州弗兰克林县小型流域大坝急需修复弥散性白粉刺材料的彻底侵蚀

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摘要

Built in 1956, the Six Mile Creek Site 26 flood control structure functioned flawlessly forrn50 years. This earth fill embankment dam is 27 feet high, has a drainage area of 1,702 acres,rnand a sediment pool area of 17 acres.rnA 2006 inspection of Six Mile Creek Site 26 revealed a small opening resembling arncrayfish hole on top of the central part of the embankment. No other abnormalities werernobserved. The 2007 inspection noted that the hole had increased in size, but again no otherrnunusual features were visible. In March 2008 the Natural Resources Conservation Servicern(NRCS) inspector received a call from an adjacent landowner concerning a hole in the dam. Arnfollow-up visit found numerous holes ranging in size from 6 inches to 2.5 feet in diameter onrnboth the downstream and upstream slopes. These holes were limited to a section of the damrnthat was excavated in the mid 1980’s during installation of a second principal spillway conduit.rnMaterial collected from around the holes was subjected to field crumb tests forrndispersion according to procedures described in USDA-SCS Soil Mechanics Note 13. Theserntests resulted in moderate to severe reaction ratings of 3’s and 4’s. Samples sent to the NRCSrnSoil Mechanics Center Laboratory for double hydrometer testing produced percent ofrndispersion readings of up to 75%.rnIt is believed that soil in the reconstructed section of the dam may have been backfilledrnwith insufficient moisture content following installation of the second principal spillway pipe inrn1985. Other possible causes for formation of the holes include inadequate compaction,rninsufficient interface between existing fill and backfill, and exposure of dispersive soils duringrninstallation of the additional conduit. The recent widespread appearance of holes on thernembankment followed approximately 10 years of very dry conditions, likely forming cracks onrnthe surface of the dam. Periods of above average rainfall in early 2008 probably acceleratedrnthe erosion process.rnFour remedies were considered: 1 - install a chimney filter; 2 - excavate thernreconstructed section and mix soil with a chemical amendment prior to replacement; 3 -rndecommission the dam; and 4 – excavate and lime treat 2 feet of material from thernreconstructed area. Option 2 allowed for a thorough examination of damage, and was thernpreferred remedy based on practicality and cost considerations. The portion of thernembankment above the principal spillway conduit was removed, processed and treated withrnquicklime equivalent to 2% by weight hydrated lime, then replaced and compacted accordingrnto NRCS standards. Funding for this project was provided by the Arkansas Natural ResourcesrnCommission.
机译：六哩溪站点26防洪结构始建于1956年，历时50年完美运作。这座土方堤坝高27英尺，排水面积为1,702英亩，淤泥池面积为17英亩。2006年对六英里溪遗址26的检查发现，小石坝中部顶部有一个类似于阿纳克雷鱼洞的小开口。路堤。没有观察到其他异常。 2007年的检查结果表明，该孔的大小有所增加，但是再也看不到其他异常特征。 2008年3月，自然资源保护局（NRCS）的检查员接到一个相邻土地所有人的电话，询问大坝的一个洞。 Arnfollow-up探访发现，在下游和上游斜坡上，无数洞的直径从6英寸到2.5英尺不等。这些孔仅限于在1980年代中期安装第二条主要溢洪道时开挖的那部分坝坝.rnn从孔周围收集的材料根据USDA-SCS土壤力学注释13中所述的程序进行了现场碎屑测试，以进行分散测试。这些测试导致3到4的中度到重度反应等级。送至NRCS的样品进行了两次比重计测试的土壤力学中心实验室产生的分散读数百分比高达75％.rn相信1985年安装第二条主要溢洪道后，大坝重建段的土壤可能被回填且水分含量不足。 。形成孔的其他可能原因包括压实不充分，现有填充和回填之间的界面不足以及在安装附加导管期间暴露出分散的土壤。大约10年的非常干燥的状况导致最近在堤岸上出现孔洞，很可能在大坝表面形成裂缝。 2008年初降雨量高于平均水平的时期可能加速了侵蚀过程。考虑了以下四种补救措施：1-安装烟囱过滤器； 2-挖开重建部分，并在更换前将土壤与化学改良剂混合； 3-停用大坝； 4 –开挖和石灰处理距离重建区域2英尺的材料。选项2允许对损坏进行彻底检查，并且是基于实用性和成本考虑的首选补救方法。除去主要溢洪道上方的堤岸部分，用相当于2％重量的熟石灰的快速石灰进行处理和处理，然后根据NRCS标准进行更换和压实。该项目的资金由阿肯色州自然资源委员会提供。

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  • 来源
    《Dam safety 2009》|2009年|p.1-12|共12页
  • 会议地点 Hollywood FL(US);Hollywood FL(US)
  • 作者

    Christopher A. King; Todd Stringer; Stanley Mathis;

  • 作者单位

    USDA Natural Resources Conservation Service;

    rnUSDA Natural Resources Conservation Service;

    rnUSDA Natural Resources Conservation Service;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TV698.23;
  • 关键词

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