Development and validation of a 3-D bonded block modelling approach to assist in the assessment of rock mass bulking and support design for highly stressed mine pillars

开发和验证 3D 粘结块建模方法，以协助评估岩体膨胀和高应力矿柱的支撑设计

• 批准号: 479085-2015
• 负责人: Eberhardt, Erik
• 金额: $ 4.13万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618153
• 关键词: Development; validation; bonded; block; modelling

With ever growing populations and rising living standards, worldwide demand for mineral resources continues to increase. Resource-rich countries like Canada are responding by mining deeper as near surface resources are exhausted. Several Canadian operations already represent some of the deepest mines in the world, and plans are to continue deeper. These will encompass large underground footprints with numerous rock pillars that are essential for maintaining safe and economic working conditions. The challenge is that during excavation, these pillars will experience significant stress-induced strength degradation and deformation leading to extensive loading of the support system, potentially leading to its failure. To address these needs, Rio Tinto through their Sudbury based Rio Tinto Centre for Underground Mine Construction (RTC-UMC), have provided research funding to (i) investigate the underlying mechanisms of rock mass bulking under complex mine stress paths, (ii) develop a numerical tool that can better account for these mechanisms, and (iii) compare and contrast the effectiveness of different support strategies. Towards this goal we have partnered with software provider Itasca to use their commercial 3-D distinct-element code 3DEC to develop a bonded-block brittle fracture modelling tool, referred to here as 3DEC-BBM. Model development will be carried out in parallel with validation and calibration exercises, using both controlled laboratory experiments and field-based data. Upon completion, the results of this research will significantly enhance Canada's body of knowledge and expertise in deep mining and rock support optimization. New tools will be developed (together with guidelines on their use) that will assist engineers in designing and safely developing the next generation of Canadian mines, helping to secure the sustainability of the industry. It will also provide HQP with unique and practical learning experiences and skill sets that are in high demand in the mining industry and are of strategic importance for Canada's future natural resource development needs.

随着人口的不断增长和生活水平的提高，全球对矿产资源的需求不断增加。随着近地表资源耗尽，加拿大等资源丰富的国家正在通过更深层次的开采来应对。加拿大的几个矿场已经拥有世界上一些最深的矿井，并且计划继续加深。这些将包括大型地下足迹和许多岩柱，这对于维持安全和经济的工作条件至关重要。挑战在于，在挖掘过程中，这些支柱将经历显着的应力引起的强度下降和变形，导致支撑系统承受大量载荷，可能导致其失效。为了满足这些需求，力拓通过位于萨德伯里的力拓地下矿山建设中心 (RTC-UMC) 提供了研究经费，以 (i) 研究复杂矿山应力路径下岩体膨胀的基本机制，(ii) 开发可以更好地解释这些机制的数值工具，以及（iii）比较和对比不同支持策略的有效性。为了实现这一目标，我们与软件提供商 Itasca 合作，使用他们的商业 3D 不同元素代码 3DEC 来开发粘合块脆性断裂建模工具，此处称为 3DEC-BBM。模型开发将与验证和校准练习同时进行，使用受控实验室实验和现场数据。完成后，这项研究的结果将显着增强加拿大在深部采矿和岩石支护优化方面的知识和专业知识。将开发新工具（及其使用指南），帮助工程师设计和安全开发下一代加拿大矿山，帮助确保该行业的可持续性。它还将为 HQP 提供采矿业急需的独特且实用的学习经验和技能，并且对加拿大未来的自然资源开发需求具有战略重要性。