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首页> 外文学位 >Rock fall mitigation for an open pit mine experiencing substantial rock fall from overblasting.
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Rock fall mitigation for an open pit mine experiencing substantial rock fall from overblasting.

机译：露天矿因过度爆破而发生大量岩石塌落的岩石减缓措施。

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摘要

Rock fall is a common hazard in open pit mines causing safety concerns for workers, transportation routes and may adversely affect mine production. To reduce and mitigate rock fall hazards, a benched slope design is normally used and, occasionally, additional mitigation may be necessary in areas with excessive rock fall hazards. Newmont's Boddington Gold Mine in Australia is experiencing substantial rock fall in the south portion of their open pit mine due to rock damage from blasting resulting in highly fractured wall rock. This has increased the volume of rock fall experienced in the mine, and the rock fall has caused accumulation of debris on benches and crest loss, reduced bench width, in some parts of the mine by as much as 40 percent. The loss of bench width has reduced the effectiveness of the benches for rock fall mitigation and allowed rock fall to travel much farther down slope than desired for safety. Because of these conditions, there is a 20 meter exclusion zone near the rock walls in the mine, reducing production and impairing safety conditions.;The mine is currently mitigating the rock fall by draped mesh, spot bolts, cable lashing and benches originally excavated at 8 meters in width. As the open pit is deepened, a more permanent rock fall mitigation method is desired. Newmont proposed several modified bench designs to be evaluated. The new bench designs were evaluated by modeling rock fall on the existing and proposed bench designs using the Colorado Rock Fall Simulation Program (CRSP) and RocFall. Newmont provided rock fall data for modeling that included the normal coefficient of restitution and rock fall video from the open pit. Rock fall kinetic energies, bounce heights and velocities on existing benches and proposed benches were examined on five cross-sections from the open pit to assess which bench design had the most efficient rock fall mitigation. The importance of testing the normal coefficient of restitution and use of rock fall video for rock fall modeling were also examined, as well as the slope steepness versus rock fall run out with the new bench designs.
机译：塌方是露天矿的常见危害，会给工人，运输路线带来安全隐患，并可能对矿山生产产生不利影响。为了减少和减轻落石危险，通常使用台阶式斜坡设计，并且偶尔，在落石危险过大的地区，可能还需要额外的缓解措施。纽蒙特（Newmont）位于澳大利亚的Boddington金矿，由于爆破对岩石造成的破坏而导致围岩高度破裂，因此其露天矿的南部出现大量岩石崩塌。这增加了矿山中发生的落石量，并且落石导致工作台上的碎屑堆积和波峰损失，使矿山的某些部分的工作台宽度减小了多达40％。板凳宽度的损失降低了板凳减缓落石的效力，并使落石向下移动的距离比安全所需的距离大得多。由于这些条件，矿山岩壁附近有一个20米的禁区，降低了产量并削弱了安全条件。;矿山目前正在通过覆盖网眼，锚栓，电缆绑扎和最初在宽8米。随着露天矿的加深，需要一种更持久的岩石崩塌减轻方法。 Newmont提出了几种经过修改的工作台设计进行评估。通过使用Colorado Rock Rock Fall Simulation Program（CRSP）和RocFall在现有和建议的工作台设计上对岩石跌落进行建模，对新的工作台设计进行了评估。 Newmont提供了用于建模的落石数据，包括正常的恢复系数和来自露天矿的落石视频。在露天矿的五个横截面上检查了现有工作台和拟议工作台的落石动能，反弹高度和速度，以评估哪种工作台设计具有最有效的落石缓解效果。还检验了测试正常恢复系数的重要性以及使用岩崩视频进行岩崩建模的重要性，以及新的工作台设计所产生的坡度与岩崩之间的关系。

著录项

  • 作者

    Cybulski, Paige G.;

  • 作者单位

    Colorado School of Mines.;

  • 授予单位 Colorado School of Mines.;
  • 学科 Geological engineering.;Civil engineering.;Mining engineering.
  • 学位 M.S.
  • 年度 2014
  • 页码 146 p.
  • 总页数 146
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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