Improved Procedures for Analyzing the Deformation and Failure Responses of Brittle Rock in High Stress Environments

高应力环境下​​脆性岩石变形和破坏响应分析的改进程序

• 批准号: RGPIN-2019-04589
• 负责人: Eberhardt, Erik
• 金额: $ 3.13万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=737720
• 关键词: Improved; Procedures; Analyzing; Deformation; Failure

Industry forecasts indicate that there will be a significant increase in production from underground mass mining operations over the next decades as available resources trend deeper. Experiences from these operations have already demonstrated that the rock mass responses encountered at the depths being considered are complex and severe. These have exposed limitations in existing predictive tools. From a support design perspective, the high stress environments and complex stress paths involved are outside the experience-base represented in the empirical design tools being relied upon. Recent successes in my research activities have identified the need for deformation-based support design where brittle failure mechanisms like spalling are involved. However, the numerical tools relied upon to calculate deformation responses are dominated by shear-based models and assumptions of volumetric dilation, whereas the excessive bulking seen in spalling pillars clearly point to an extensional failure mechanism and directional dilation. For this, we have developed a first-of-its-kind 3-D confinement-dependent strength mobilization model and associated 3-D directional dilation model for brittle rock. Complementing this is a pillar-scale 3-D bonded-block modelling technique we've developed capable of explicitly modelling excavation-scale brittle failure and rock mass bulking due to geometric incompatibilities when broken pieces of rock move relative to each other as they are squeezed into the excavation, together with the performance response of different support strategies to these. The research proposed for this Discovery Grant will build on these successes to further advance our understanding of brittle rock mass deformation and failure, while taking important steps to advance and validate the tools we've developed. This will be achieved through research objectives that will see HQP trained in both the state-of-practice and state-of the-art in rock mass characterization, rock mechanics testing, interpretation of mine monitoring data, and advanced numerical modelling. Together, the research program proposed will help to deliver and promote the use of new tools and knowledge more suitable for the challenges that will be encountered as Canadian mines progress to greater depths. Best practice guidelines will be produced that will help contribute to better management of deep mining stresses and adverse rock mass responses through improved support design strategies. Close collaboration with existing industry partners will help to ensure that research deliverables (knowledge, tools, methods, etc.) will be quickly and effectively transferred, facilitating optimization opportunities and improved safety on a reduced time-line between R&D of new techniques and their implementation. HQP will learn skills that are in high demand in the Canadian resource industry and are of strategic importance for Canada's future natural resource development needs.

行业预测表明，随着未来几十年的地下批量采矿业务将大幅增加，因为可用资源趋势更深。这些操作的经验已经表明，在被认为的深处遇到的岩石质量反应是复杂而严重的。这些在现有的预测工具中存在暴露的局限性。从支持设计的角度来看，所涉及的高应力环境和复杂的应力路径不在经验设计工具中所代表的经验基础之外。我的研究活动的最新成功已经确定了基于变形的支撑设计的需求，其中涉及诸如剥落之类的脆性故障机制。但是，基于剪切的模型和体积扩张的假设所占据主导地位的变形响应的数值工具，而在剥落支柱中看到的过量散装显然表明了扩展失败机制和方向扩张。为此，我们为脆性岩石开发了一种首先的3-D限制强度动员模型和相关的3D定向扩张模型。补充这是一种支柱尺度的3-D键模建模技术，我们已经开发了能够显式建模挖掘尺度的脆性故障和由于几何不相容性而引起的岩石堆积，当岩石破碎的岩石彼此相对移动时，它们被挤压到发掘中，以及对这些不同的支持策略的绩效响应。这项发现赠款提出的研究将基于这些成功，以进一步促进我们对脆性岩体变形和失败的理解，同时采取重要步骤促进和验证我们开发的工具。这将通过研究目标来实现，这些目标将在岩石质量表征，岩石力学测试，矿山监测数据的解释和高级数值建模方面的实践和最先进的HQP训练。共同提出的研究计划将有助于交付和促进新工具和知识的使用，更适合随着加拿大矿山发展到更大深度的挑战。将制定最佳实践指南，这将有助于通过改进的支持设计策略来更好地管理深层采矿压力和不利质量质量反应。与现有行业合作伙伴的密切合作将有助于确保研究可交付成果（知识，工具，方法等）将快速有效地转移，从而促进优化机会，并改善新技术R＆D之间的时间表及其实施之间的时间表。 HQP将学习加拿大资源行业需求量很高的技能，并且对加拿大未来的自然资源开发需求具有战略意义。