摘要
深部区域采矿时序是深部地压管控的重要战略方法之一,其卸荷力学效应与回采时序密切相关。针对构建的深部由中心向四周回采的立体式大区域开采力学模型,基于应力转移过程和岩爆应力风险特征,研究从单个采场到多个采场回采过程中的应力演化规律和岩爆应力风险变化规律。研究结果表明:深部从中心到四周的立体式回采顺序能够实现采矿作业区高应力的逐步转移和应力风险的渐进推移,深部区域采矿时序的地压调控卸荷效应是通过回采时序的合理设置实现期望的卸荷应力环境再造和深部采矿应力风险的渐进转移过程行为。基于数值模拟与微震监测相结合的互馈分析技术,实现大区域数值模拟与微震监测大数据的高度融合、实时动态分析与跟踪评价,是深部区域采矿时序的地压调控卸荷效果评价的有效方法。深部开采区域时序调控卸荷效应的本质是主动创造高应力环境中低值应力卸荷区思想,这一思想已在加拿大Nickel Rim South矿得到了实践应用,取得良好的卸荷效果并实现了地压的合理管控,对于我国深部、超深部开采具有重要的指导意义。
The regional time-space mining sequence is one of the important strategic methods for underground pressure management at depths and destress mechanical effect is closely related to the time-space mining sequence itself.Aiming at the large-area mining mechanical model of three-dimensional mining sequence from the centre to the periphery at depths,based on the stress transfer process and characteristics of rockburst stress hazard,the stress evolution laws and changes of rockburst stress hazard were studied during the mining process from a single stop to multiple stopes.The research results show that the three-dimensional mining sequence from the center to the periphery at depths can gradually realize the gradual transfer of high stress and the gradual transition of stress hazard around the mining operation area.The destress effect of ground pressure control for the time-space mining sequence at depths is to achieve the desired destress environment reconstruction and the progressive transfer of the stress hazard through the reasonable setting of the three-dimensional mining sequence.The mutual feedback analysis technology based on the combination of numerical simulation and microseismic monitoring could realize high integration of large area numerical simulation and big data of microseismic monitoring,real-time dynamic analysis and tracking evaluation,and it is an effective method to evaluate the destress effect of ground pressure control for the time-space mining sequence at depths.The essence of the destress effect of ground pressure control for the time-space mining sequence at depths is the idea to actively create low stress destress zone in the high-stress environment.This idea had been applied at Nickel Rim South mine in Canada,which had achieved a good destress effect and realized reasonable management for ground control.It is believed that this idea has important guiding significance for deep and ultra-deep mining in China.
作者
于世波
杨小聪
原野
王志修
YU Shibo;YANG Xiaocong;YUAN Ye;WANG Zhixiu(BGRIMM Technology Group,Beijing 102628,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;National Centre for International Research on Green Metal Mining,Beijing 102628,China)
出处
《黄金科学技术》
CSCD
2020年第3期345-352,共8页
Gold Science and Technology
基金
国家重点研发计划项目“深部金属矿协同开采理论与技术”(编号:2016YFC0600709)
“深部大矿段采动环境监测及地压动态调控技术”(编号:2017YFC0602904)联合资助。
关键词
深部区域
应力转移
采矿时序
数值模拟
岩爆应力风险
卸荷
deep region
stress migration
time-space mining sequence
numerical simulation
rockburst stress hazard
destress
