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Seismic retro-fit of an historic earth dam using grouted stone columns

机译：使用灌浆石柱对历史悠久的土坝进行地震改造

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摘要

An earth dam in Victoria, constructed in 1885 as part of Melbourne’s water supply system, has beenrnin continuous use and will continue to form an integral element of the system. A safety reviewrnbetween 2004 and 2006 identified remedial works requirements to address a number of issuesrnincluding embankment stability. Analysis of geotechnical information for the site, in conjunction withrngeological modelling, concluded there were layers and zones of soils that exhibited the potential forrnliquefaction under earthquake loads, thus constituting a significant risk to the stability of thernembankment and the water supply. Design parameters were agreed and three areas were specifiedrnfor treatment. Ground improvement options were assessed and the solution adopted was to installrngrouted stone columns. The design was undertaken, reviewed and accepted and the work carried outrnbetween July and September 2011. Grouted stone columns were formed using the bottom feed vibrornsystem, conventionally used for the construction of vibro stone columns. A cement-bentonite slurryrnmix formed the grout, which was added to the stone prior to its placement into the vibro rig’s hopper.rnSeveral trial columns were carried out, with attention being paid to the stone size and grading; therngrout components and proportions; and installation procedures. This paper presents the backgroundrnto the solution adopted to retro-fit the dam against future seismic events and presents the results ofrntesting, initial trials and the implementation of the ground improvement.
机译：维多利亚的土坝于1885年建成，是墨尔本供水系统的一部分，一直在连续使用，并将继续构成该系统的组成部分。 2004年至2006年之间的安全审查确定了补救工作的要求，以解决包括路堤稳定性在内的许多问题。结合地质建模，对该地点的岩土信息进行分析后得出结论，在地震荷载作用下，土壤的某些层和区域表现出潜在的液化作用，因此对堤岸和供水的稳定性构成了重大风险。商定了设计参数，并指定了三个区域进行处理。评估了地面改良方案，采用的解决方案是安装灌浆的石柱。在2011年7月至2011年9月之间进行了设计，审查和验收，并进行了工作。灌浆石柱使用底部进料振动系统（通常用于振动石柱的构造）形成。水泥-膨润土泥浆混合物形成水泥浆，然后将其添加到石材中，然后再放入振动钻机的料斗中。rn进行了几次试验，注意石材的尺寸和等级。灌浆成分和比例；和安装程序。本文介绍了针对大坝进行翻新以应对未来地震事件的解决方案的背景，并提供了测试，初步试验和地面改良实施的结果。

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  • 来源
  • 会议地点 Melbourne(AU)
  • 作者

    D. Avalle; B. Kok; T. Lennie;

  • 作者单位

    Keller Ground Engineering, P.O. Box 7974, Baulkham Hills NSW 1755, PH (02) 8866 1155, FAX (02) 8866 1151, email: davalle@kellerge.com.au;

    Geoinventions Consulting Services, P.O. Box 2320, Runcorn QLD 4113, PH (0420) 906 194, email: barry.kok@geoinventions.com.au;

    Water Resources Alliance, 176 Wellington Parade, East Melbourne, VIC 3002, PH (0448) 323 092, email: tlennie@baulderstone.com.au;

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

    ground improvement; earth dam; liquefaction; seismic risk; grouted stone columns; vibro;

    机译：地面改良;土坝;液化;地震风险;灌浆石柱;振动;

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