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: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=363229
• 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.

矿山回填是用于填充通过采矿创建的地下发掘的材料或材料，以便在经济上建立和保留安全的工作条件。如今，高质量的回填混合物可以通过减少的水泥含量进行设计，并能够满足更严格的生产和环境要求，而对操作的风险很小。精心设计的回填设计，过程或实践必须是安全的，尤其是采用底切矿井方法的操作。尽管回填混合的工程设计已经很好地发达，但回填质量与未知，理解或应用的发掘边界之间的相互作用很大，尤其是在处理填充（底切矿山）情况下的采矿时。当填充下的挖掘时，填充柱的底部被完全暴露，并且由于最小的基础，填充质量可能会出现巨大的后果。仍然需要进行许多回填设计和安置的改进，以建立更安全，更高效且成本较低的底切采矿实践。这项研究旨在建立关键发掘边界参数的影响，例如墙壁粗糙度和墙壁闭合对在不同尺寸的发掘中使用用于sillmat构造的不同回填混合物的性能。一个30 G-TON离心机构成了由分析和数值建模方法支持的主要建模工具。这项研究的预期意义是开发了改进且准确的Sillmat设计程序，并将改善基于经验，反复试验方法的当前技术。将开发有关Sillmats工业设计的详细方法，测试协议和基准程序。