摘要
为实现露天转地下开采金属矿山隔离矿柱的安全高效回采,采用Mathews稳定图法计算采场参数,结合FLAC3D软件分析不同回采方式对采场稳定性的影响,通过现场试验验证上向进路充填采矿法+构筑人工假顶的回采方案。结果表明,设计采场的上盘水力半径为1.64 m,顶板无支护最大跨度为3.5 m,均在理论计算的安全范围内,采场结构参数满足安全要求。隔一采一回采方式下,采场的最大压应力与最大拉应力均小于岩体的抗压强度与抗拉强度,形成的塑性区未贯穿采场,采场处于稳定状态。现场试验应用上向进路充填采矿法+1.5 m厚钢筋混凝土人工假顶的回采方案及隔一采一的回采方式后,单个矿块生产能力达100 t/d,损失率为4%,贫化率为5%,回采矿块数量稳定,经济效益良好。
In order to realize the safe and efficient mining of isolated pillars in metal mines transitioning from open-pit to underground mining,Mathews stability diagram method was used to calculate stope parameters.Combined with FLAC3D software,the influence of different mining methods on stope stability was analyzed.Upward drift filling mining method+construction of artificial false roof mining scheme was verified by field test.The results show that the hydraulic radius of the hanging wall of the designed stope is 1.64 m,and the maximum span of the roof without support is 3.5 m,both of which are within the safe range of theoretical calculation.The structural parameters of the stope meet the safety requirements.Under the mining method of skip mining,the maximum compressive stress and maximum tensile stress of the stope are less than the compressive strength and tensile strength of the rock mass,and the formed plastic zone does not penetrate the stope,indicating that the stope is in a stable state.In the field test,the production capacity of a single ore block reaches 100 t/d,the loss rate is 4%,and the dilution rate is 5%after the application of the mining scheme of the upward drift filling mining method+1.5 m thick reinforced concrete artificial false roof and the mining method of skip mining.The number of ore blocks is stable and the economic benefit is good.
作者
肖利民
熊鹏
董翔
XIAO Limin;XIONG Peng;DONG Xiang(Changsha Institute of Mining Research Co.,Ltd.,Changsha,Hunan 410012,China;State Key Laboratory of Metal Mine Safety Technology,Changsha,Hunan 41o012,China)
出处
《矿业研究与开发》
北大核心
2025年第8期22-29,共8页
Mining Research and Development
关键词
露天转地下开采
隔离矿柱回采
采场稳定性
上向进路充填采矿法
数值模拟
Transition from open-pit to underground mining
Isolated pillar mining
Stope stability
Upward drift filling mining method
Numerical simulation
