Geotechnical risk assessment of haulage drifts during the life of a mine plan

采矿计划生命周期内运输漂移的岩土工程风险评估

• 批准号: 369133-2008
• 负责人: Mitri, Hani
• 金额: $ 8.2万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=434640
• 关键词: Geotechnical; risk; assessment; haulage; drifts

In a globally competitive minerals market, Canadian mines continue to face the pressure to reduce costs. One approach to reducing mining costs is by the reduction of unplanned interruptions to production for the rehabilitation of haulage drifts. These drifts are the principal roadways for haulage trucks and load-haul-dump vehicles, which transport the blasted ore from the mining block or stope to the nearest ore transfer facility such as an ore pass. Unplanned interruptions to production can have adverse influence on the cost of mining and ultimately on the profitability of an operation. Drift rehabilitation involves the installation of additional ground supports to help the drift regain its stability and functionality. Thus, it would be advantageous to be able to know ahead of time when and where a haulage drift is due for maintenance or support enhancement during its service life so that a preventive maintenance program can be scheduled and implemented in a timely fashion without interruption to production. Currently, there are no established guidelines to help the mine planner assess drift stability condition as it changes (deteriorates) with mining activities. The goal of this research project is thus to develop new design tools capable of predicting the location, timing and magnitude of required drift support enhancement with respect to scheduled mining activities during the service life of the drift. With these new tools, interruption to production schedule can be eliminated or minimized thus reducing cost. The new design tools will be developed from the study of the geotechnical risk of drift instability and how it is affected by the extraction of nearby mining blocks. Drift geotechnical stability is determined from numerical (computer) modelling analyses which account for the rock mass properties as well as the geometric configuration of the mining system and block extraction sequence. Model results are then compared with measurements and /or observations from the field to validate the models. The project case study is the Garson Mine of Vale Inco Limited. While the study is focused on the Garson Mine, its findings will be applicable to many other underground metal mines in Canada and other mining countries.

在全球竞争激烈的矿产市场中，加拿大矿山继续面临降低成本的压力。降低采矿成本的一种方法是减少因恢复运输巷道而造成的计划外生产中断。这些巷道是运输卡车和装载运输自卸车辆的主要道路，它们将爆破矿石从矿区或采场运输到最近的矿石转运设施，例如矿石通道。计划外的生产中断可能会对采矿成本产生不利影响，并最终影响运营的盈利能力。漂移修复涉及安装额外的地面支撑，以帮助漂移恢复其稳定性和功能。因此，能够提前知道运输漂移在其使用寿命期间何时何地需要进行维护或增强支持将是有利的，以便可以及时安排和实施预防性维护计划，而不会中断生产。目前，还没有既定的指南来帮助采矿规划人员评估漂移稳定性条件，因为漂移稳定性条件会随着采矿活动而变化（恶化）。因此，该研究项目的目标是开发新的设计工具，能够预测巷道使用寿命期间相对于预定采矿活动所需的巷道支护增强的位置、时间和幅度。借助这些新工具，可以消除或最大限度地减少生产计划的中断，从而降低成本。新的设计工具将通过研究漂移不稳定的岩土工程风险以及附近矿块开采对其的影响来开发。巷道岩土稳定性是通过数值（计算机）建模分析确定的，该分析考虑了岩体特性以及采矿系统的几何配置和块提取顺序。然后将模型结果与现场测量和/或观察进行比较，以验证模型。该项目案例研究是 Vale Inco Limited 的 Garson 矿。虽然该研究的重点是加森矿，但其研究结果将适用于加拿大和其他采矿国家的许多其他地下金属矿。