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Developing a ground control strategy for squeezing conditions in hard rock mines

制定针对硬岩矿山挤压条件的地面控制策略

基本信息

批准号：
447999-2013
负责人：
Hadjigeorgiou, John
金额：
$ 3.37万
依托单位：
University of Toronto
依托单位国家：
加拿大
项目类别：
Collaborative Research and Development Grants
财政年份：
2015
资助国家：
加拿大
起止时间：
2015-01-01 至 2016-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=575350
关键词：
Developing ground control strategy squeezing

项目摘要

A large number of underground hard rock mines are exposed to large scale deformation often referred as squeezing ground conditions. This has major economic and safety implications for the mining industry especially where deeper excavations are developed. The majority of tools used to estimate the susceptibility of excavations to closure are based on empirical data from civil engineering tunnels in weak rock. Rock masses composed of weak rock tend to behave in a nearly isotropic fashion even when highly foliated. Excavations in foliated hard rock are more susceptible to anisotropic behaviour. The levels of what is considered acceptable squeezing in a mining environment are quite higher in a mining environment as opposed to tunnelling. This allows some more flexibility to operators. On the other hand, mines have to work with what are considerably higher constraints in the choice of economic support. Squeezing ground conditions in mines are characterized by significant failure of ground support systems that often necessitates considerable rehabilitation work. This project addresses squeezing rock challenges at two underground Canadian mines owned by Agnico-Eagle Mines Ltd: LaRonde and Lapa. Both mines are located in the Abitibi region of Northwest Quebec and are facing large rock mass deformations. Of interest is that the two mines, located 11 kilometres from each other provide a large spectrum of squeezing ground control conditions.

大量地下硬岩矿山面临大规模变形，通常称为挤压地面条件。这对采矿业具有重大的经济和安全影响，特别是在进行更深的挖掘时。大多数用于估计开挖对封闭敏感性的工具都是基于软弱岩石土木工程隧道的经验数据。即使在高度叶化的情况下，由软质岩石组成的岩体也往往表现出接近各向同性的方式。叶状硬岩中的挖掘更容易受到各向异性行为的影响。与隧道开挖相比，在采矿环境中被认为可接受的挤压水平在采矿环境中要高得多。这为操作员提供了更多的灵活性。另一方面，矿山在选择经济支持方面必须面临相当严格的限制。矿山挤压地面条件的特点是地面支撑系统严重失效，通常需要大量的修复工作。该项目解决了 Agnico-Eagle Mines Ltd 拥有的两个加拿大地下矿场的挤压岩石挑战：LaRonde 和 Lapa。两个矿山均位于魁北克省西北部的阿比蒂比地区，面临着巨大的岩体变形。有趣的是，这两个矿井相距 11 公里，提供了广泛的挤压地面控制条件。