The effect of excavation boundary conditions on the design of mine backfills

开挖边界条件对矿山充填体设计的影响

• 批准号: 44310-2006
• 负责人: DeSouza, Euler
• 金额: $ 0.91万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=332098
• 关键词: effect; excavation; boundary; conditions; design

Mine backfill is the material, or materials, used to fill underground excavations created by mining so as to establish and retain safe working conditions economically. Today, high quality backfill mixes can be engineered at reduced cement content and are able to meet stricter production and environmental requirements with minimal risk to the operations. A well-engineered backfill design, process or practice must be safe, in particular for operations employing undercut mining methods. Even though the engineering design of backfill mixes has been well developed, there is much in the interaction between the backfill mass and the excavation boundaries that is not known, understood or applied, particularly when dealing with mining under fill (undercut mining) situations. When mining under fill, the bottom of the fill column is fully exposed and, because of minimum underpinning, the fill mass could fail with dramatic consequences. A number of improvements in current backfill design and placement are still required to establish safer, more efficient and less costly undercut mining practices. This research aims at establishing the effect of critical excavation boundary parameters, such as wall roughness and wall closure on the performance of different backfill mixes used for sillmat construction placed in excavations of differing dimensions. A 30 g-ton centrifuge constitutes the primary modeling tool, supported by analytical and numerical modeling methods. The expected significance of this research is the development of an improved and accurate procedure for sillmat design and will improve present techniques that are based on experience and trial and error methods. Detailed methodologies, test protocols and benchmark procedures for industrial designs of sillmats will be developed.

矿井回填是用于填充采矿产生的地下坑道的材料，以便经济地建立和保持安全的工作条件。如今，高质量的回填混合物可以在减少水泥含量的情况下进行设计，并且能够满足更严格的生产和环境要求，同时将运营风险降至最低。精心设计的回填设计、工艺或实践必须是安全的，特别是对于采用底切采矿方法的作业。尽管回填混合物的工程设计已经得到很好的发展，但回填体和开挖边界之间的相互作用仍有很多未知、理解或应用的地方，特别是在处理充填下采矿（底切采矿）情况时。当在充填下采矿时，充填柱的底部完全暴露，并且由于托换作用最小，充填体可能会失败并产生严重后果。目前的回填设计和布局仍需要进行许多改进，以建立更安全、更高效和成本更低的底切采矿实践。本研究旨在确定关键开挖边界参数（例如壁粗糙度和壁闭合度）对不同尺寸基坑中用于基垫施工的不同回填混合物性能的影响。 30 克吨离心机构成主要建模工具，并得到分析和数值建模方法的支持。这项研究的预期意义是开发一种改进且准确的 sillmat 设计程序，并将改进基于经验和试错方法的现有技术。将开发用于防滑垫工业设计的详细方法、测试协议和基准程序。