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计划外的生产中的中断以恢复运输漂移。这些漂移是运输卡车和负载荷兰车辆的主要道路，这些车辆将被炸毁的矿石从采矿块或阶梯运送到最近的矿石转移设施（例如矿石通行证）。计划外的生产中断会对采矿成本以及最终对运营的盈利能力产生不利影响。漂移康复涉及安装其他地面支撑，以帮助漂移恢复其稳定性和功能。因此，能够提前知道在服务寿命期间进行维护或支持增强的何时何地，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，这将是有利的。当前，尚无既定指南来帮助矿山规划师评估漂移稳定性条件，因为它随着采矿活动的变化（恶化）。因此，该研究项目的目的是开发能够预测在漂移使用寿命期间相对于计划采矿活动的所需漂移支持增强所需漂移支持增强的位置和幅度的新设计工具。借助这些新工具，可以消除或最小化生产计划的中断，从而降低成本。新的设计工具将从研究漂移不稳定的岩土技术风险以及如何受到附近采矿区的提取的影响而开发。漂移岩土稳定性是根据数值（计算机）建模分析确定的，该分析解释了岩体质量特性以及采矿系统的几何配置和块提取序列。然后将模型结果与田间的测量和 /或观察值进行比较，以验证模型。项目案例研究是Vale Inco Limited的Garson矿山。虽然该研究集中在加森矿山上，但其发现将适用于加拿大和其他采矿国家的许多其他地下金属矿。