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首页> 外文会议>Deep Foundations Institute 28th Annual Conference on Deep Foundations: Deep Foundations in Compressible Soil and Soft Rock >CUT- OFF WALLS FOR DIAMOND MINING IN THE ARCTIC
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CUT- OFF WALLS FOR DIAMOND MINING IN THE ARCTIC

机译：在北极切割钻石的墙壁

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A 3800 m long temporary water-retaining dike has been constructed under extreme conditions in the harsh northern climate to enable two of the kimberlite pipes at the Diavik Diamond Project reserve to be mined using open pits. The Diavik Diamond Project is located on East Island at Lac de Gras in Canada's Northwest Territories, approximately 200 kilometres south of the Arctic Circle. The dike which has been constructed in up to 25 m deep water from crushed granite quarried from the site projects into Lac de Gras encircles the first two of the kimberlite pipes to be mined. An 800 mm wide diaphragm cutoff wall constructed of bentonite, cement and crushed rock, totalling 33,000 m~2, and a two-phase jet grouted curtain wall at its base, totalling 8,400 m~2, have been installed through the dike and underlying till foundation into bedrock. The cut-off is designed to minimise water seepage from Lac de Gras through the dike. In order to ensure that the dike had adequate internal stability and diaphragm wall construction could proceed safely, the crushed rock fill material dumped into the lake was first compacted by TR 75 deep vibrators. In 2000, Bauer Maschinen GmbH of Schrobenhausen, Germany were awarded the contract for the supply of all specialist foundation equipment required on site and for providing technical support to the Canadian main contractor Lac-de-Gras-Construction throughout the construction of the cut-off walls during 2001 and 2002. Installation of the cut-off walls was completed in July 2002, three weeks ahead of schedule, and dewatering of the inner dike areas commenced just 5 days later and has continued throughout August and September. After completion of extensive testing of the diamond recovery plant, the mine is scheduled to go into full open pit production in February 2003.
机译：在极端恶劣的北部气候条件下，已经在极端条件下建造了一条3800 m长的临时挡水堤，以使Diavik Diamond Project储备区的两条金伯利岩管道可以通过露天开采。 Diavik钻石项目位于加拿大西北地区格拉克湖东岛，在北极圈以南约200公里处。堤坝是用从现场开采的碎花岗岩挖出的深达25 m的深水构造的，并伸入Lac de Gras，环绕着要开采的前两个金伯利岩管道。穿过堤坝和下层的土层，安装了由膨润土，水泥和碎石构成的800 mm宽的隔膜防渗墙，总墙面积为33,000 m〜2，底部为两相喷射灌浆幕墙，总面积为8,400 m〜2。基础成为基石。截流管的设计可最大程度地减少Lac de Gras堤坝渗水。为了确保堤防具有足够的内部稳定性，并且可以安全地进行隔板墙的施工，首先使用TR 75深层振动器将倾倒入湖中的碎石料压实。 2000年，德国Schrobenhausen的Bauer Maschinen GmbH赢得了提供现场所需的所有专业地基设备的合同，并在整个截水线的施工过程中为加拿大主要承包商Lac-de-Gras-Construction提供了技术支持防渗墙在2001年和2002年期间进行。防渗墙的安装于2002年7月完成，比原计划提前了三周，内部堤坝地区的排水仅在5天后开始，并一直持续到整个8月和9月。在完成对钻石回收厂的广泛测试之后，该矿井计划于2003年2月开始全面露天开采。

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