Ground control strategies for burst prone mines

易爆地雷的地面控制策略

• 批准号: RGPIN-2020-05645
• 负责人: Mitri, Hani
• 金额: $ 3.13万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=717724
• 关键词: Ground; control; strategies; burst; prone

As Canadian mines continue to reach deeper deposits, more emphasis is being placed on ground control measures to deal with rock instability issues due to high in-situ stress leading to various forms of catastrophic rock failures such as strain burst, pillar burst, and fault-slip burst. The long-term objective of this research program is to contribute to the development of practical tools that would help mining operations take appropriate ground control measures to mitigate and control rockbursts. In the short term, this research program encompasses five research projects as follows. The first project (MSC 1) examines large-scale panel destress blasting, which is used when an ore pillar is highly stressed. The project aims to optimize the main design parameters namely 1) stand-off distance between the orebody contact and the panel, 2) blasted panel width and 3) panel extension beyond the ore pillar limits. Methodology is based on numerical modelling and analysis of field data. Project 2 (PhD 1, UG 1 to 3) seeks to investigate a range of Canadian mine hard rocks for their intrinsic properties. The goal is to better understand the influence of intrinsic rock properties such as grain size and mineral composition on the bursting behaviour of the rock. The work involves the use of scanning electron microscope, powder X-ray diffraction, particle flow code simulation (PFC) and laboratory testing. Project 3 (PhD 2, UG 4 and 5) will investigate borehole deformation and breakout in high stress environment. The goal is to develop a methodology to estimate mining-induced stress to help make informed decisions on ground control strategies. The project will test and develop two different approaches one that is based on deformation measurement, and another based on forced breakout. The methodology involves CAD design and fabrication, numerical modelling, laboratory and field testing. The notion of notching boreholes under load to reduce the surrounding stress is explored in laboratory in Project 4 (MSC 2) and in the field in Project 5 (MSC 3). The aim is to find out if borehole notching could become a practical means for local energy dissipation through self fracturing of the boreholes. The work encompasses laboratory and field testing and numerical modelling. As a global mineral producer, Canada needs HQP with knowledge and skills in rock engineering, underground mining and rockburst control methods. This research program offers a unique opportunity for the training of 10 HQP namely 2 PhD, 3 MSC and 5 undergraduate (UG) students. The proposed work on borehole deformation and breakout (Project 3) has far more applications than presented in this proposal. It has potential applications in civil engineering tunnels and borewell stability projects. Therefore, a technological breakthrough could find much broader variety of end users.

随着加拿大矿山不断深入到更深的矿床，由于高地应力导致各种形式的灾难性岩石破坏，如应变破裂、矿柱破裂和断层滑动破裂，因此越来越重视地面控制措施，以处理岩石不稳定问题。这项研究计划的长期目标是促进实用工具的发展，帮助采矿作业采取适当的地面控制措施来减轻和控制岩爆。在短期内，本研究计划包括以下五个研究项目。