大孤山铁矿楔形转接过渡露天地下协同开采模式研究

Study on Wedge Transition of Open-pit and Underground Collaborative Mining Mode in Dagushan Iron Mine

为解决露天转地下过渡期的产能衔接问题,以大孤山铁矿为工程背景,采用楔形转接过渡露天地下协同开采模式,通过地下开采挂帮矿弥补过渡期露天产能的不足。为此,优化了露天开采的最终境界,研究了挂帮矿的开采时间及诱导冒落工艺,并在此基础上,分别设计了小孤山采区和大孤山采区的露天地下协同开采方案,小孤山采区过渡期总产能为620万t/a左右,大孤山采区过渡期总产能为900万t/a左右。理论研究和实践表明,楔形转接过渡露天地下协同开采模式能够满足大孤山铁矿过渡期的产能需求,实现矿山的稳产过渡。

In order to solve the problem of capacity convergence in the transition from open-pit mining to underground mining, taking Dagushan Iron Mine as the engineering background, the wedge transition of open-pit and underground collaborative mining mode was adopted. The underground hanging-wall ore was mined to make up the shortage of open-pit capacity. Therefore, the final boundary of open-pit mining was optimized, and the mining time and induced caving process of hanging-wall ore were studied. On this basis, the open-pit and underground collaborative mining schemes of Xiaogushan mining area and Dagushan mining area were designed respectively. The total production capacity of Xiaogushan mining area in the transition period was about 6.2 million t/a, and that of Dagushan mining area was about 9 million t/a. Theoretical research and practice show that the wedge transition of open-pit and underground collaborative mining mode can meet the capacity demand of Dagushan iron mine during the transition period and realize the stable production transition of the mine.