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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Fast, safe, and tally mechanized installation of high-tensile chain-link mesh for underground support
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Fast, safe, and tally mechanized installation of high-tensile chain-link mesh for underground support

机译：快速，安全，轻巧地机械安装高强度链环网，用于地下支撑

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摘要

The ever-increasing depth of mineral extraction presents a challenging environment for hard-rock underground mines. High in situ stresses and associated seismidty with potential rockburst hazards are the major decisive factors contributing to the choice of a ground support regime. Conventional ground support systems, designed primarily for static loads, are not always capable of providing safe working conditions for underground personnel in seismically active mines. Systems specifically developed to resist dynamic loading and allowing for larger deformations are therefore preferred alternatives. High-tensile chain-link mesh has a proven record of successful use in open cut operations in various rockfall barrier installations due to its high energy absorption capacity. It has also been used in underground operations in various parts of the world. Its application in South African underground mining, however, is limited due to the high labour intensity. This paper describes a method of mechanized installation of a chain-link mesh as evaluation at Gold Fields' South Deep Gold Mine situated some 45 km south-west of Johannesburg. A purpose-built mechanized roll mesh handler, developed in Australia, was used in this trial. The handler is compatible with all standard multi-boom underground drill rigs and is operated utilizing the hydraulic circuit normally used for the feed arrangement. A number of key performance indicators have been specified as success criteria by Gold Fields: A 30% faster installation compared to the conventional methodology; The mesh should sustain any blast damage when applied to the blasting face; No unravelling of the mesh when cut; No failure of mesh under normal conditions; Reliability of the MESHA~R installation handler (availability >90%); Compatibility of the MESHA~R installation handler with AC 282 boomers. Although the energy-absorbing mesh combined with yielding rockbolts is a ground support system of choice for rockburst-prone conditions, the operational upsides recognized during the trial imply that this product can also be competitively used in less demanding ground conditions where weld mesh or shotcrete are customarily used as a primary surface support.
机译：矿物开采深度的不断增加为硬岩地下矿山提供了一个充满挑战的环境。高地应力和伴随地震的潜在岩爆危险是决定选择地面支撑制度的主要决定性因素。传统的地面支撑系统主要设计用于静载荷，但并不总是能够为地震活跃矿井中的地下人员提供安全的工作条件。因此，专为抵抗动态载荷并允许更大变形而开发的系统是首选替代方案。高张力的链节网片具有很高的能量吸收能力，因此已在各种碎石屏障设备的露天开采作业中成功使用，这已被证明是成功的记录。它也已用于世界各地的地下作业。但是，由于劳动强度高，其在南非地下采矿中的应用受到限制。本文描述了一种机械化安装链节网的方法，以评估位于约翰内斯堡西南约45公里处的金矿场南深金矿。在该试验中使用了在澳大利亚开发的专用机械化辊网处理机。该装卸机与所有标准的多臂地下钻机兼容，并使用通常用于进料装置的液压回路进行操作。 Gold Fields已将许多关键性能指标指定为成功标准：与传统方法相比，安装速度提高了30％;应用于喷砂面时，网格应承受任何喷砂破坏;切开后不会破坏网格;正常情况下，网片不会破裂; MESHA〜R安装处理程序的可靠性（可用性> 90％）; MESHA〜R安装手柄与AC 282臂架的兼容性。尽管吸能网片与高强度锚杆结合在一起是岩爆易发情况的首选地面支撑系统，但在试验期间公认的操作优势表明，该产品还可以在要求较低的地面条件下竞争性地使用，在这种情况下，焊接网或喷射混凝土是必需的。通常用作主要表面载体。

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