紫金山金铜矿地下开采微震活动规律研究  

Analysis of microseismic activity rules of underground mining in Zijinshan Gold and Copper Mine

作　　者：林喜康 游新天 LIN Xikang;YOU Xintian(Zijinshan Gold and Copper Mine,Zijin Mining Group Co.,Ltd.,Longyan 364200,China)

机构地区：[1]紫金矿业集团股份有限公司紫金山金铜矿,福建龙岩364200

出　　处：《中国矿业》2023年第12期170-176,共7页China Mining Magazine

基　　金：国家自然科学基金面上项目资助(编号:62276058,51974059)。

摘　　要：频繁的地下开采活动对巷道围岩稳定造成反复的扰动,加剧了巷道围岩破坏风险。紫金山金铜矿地下开采采用大直径深孔嗣后充填法开采,侧向崩矿,最大单次爆破药量达4 t,爆破扰动大,局部区域巷道围岩出现了不同程度的破坏现象。结合紫金山金铜矿采场与工程布置,构建了32通道微震监测系统,研究开采过程中围岩微震时空演化规律,评估巷道围岩破坏风险。研究结果表明,地压较突出的矿体东翼区域微震定位误差小于8 m;矿体东翼蚀变岩体与开采活动是影响紫金山金铜矿-100~+100 m微震事件聚集区形态、大小等特征的重要因素,微震事件主要集中于-50~+100 m矿体东翼,微震事件聚集区域附近均有正开采采场分布;微震lg EI、位移与微震事件密度云图呈明显差异性分布特征,-50 m中段7#采场应力较高,位移相对较大,微震事件较集中,该处发生灾害风险相对较大;巷道围岩破坏现场调查发现,50 m中段沿脉巷道与9#穿脉、E3#穿脉交岔口,-50 m中段沿脉巷道与7#穿脉、E3#穿脉交岔口巷道出现片帮、裂缝等破坏现象,巷道围岩发生破坏的位置与微震lg EI、位移集中区分布基本吻合。研究成果有助于指导紫金山金铜矿支护参数优化,对实现矿山安全生产具有重要意义。Frequent underground mining activities have caused repeated disturbances to the stability of roadway surrounding rocks,exacerbating the risk of roadway surrounding rock damage.The Zijinshan Gold and Copper Mine employs large-diameter deep-hole filling mining for underground mining,resulting in lateral ore body collapses.With a maximum single blasting charge of 4 tons,these blasting activities create significant disruptions,leading to varying degrees of damage in localized roadway surrounding rock areas.To address this issue,a 32-channel microseismic monitoring system is established,taking into account the layout of the Zijinshan Gold and Copper Mine.This system is used to study the spatio-temporal evolution of microseismic events in the roadway surrounding rocks during the mining process and to assess the risk of roadway surrounding rocks damage.The results indicate that the positioning error for microseismic events in the prominent ground pressure area of the eastern wing of the ore body is less than 8 meters.The alteration of rock bodies in the eastern wing of the ore body,along with mining activities, plays a crucial role in shaping the characteristics such as size and morphology of microseismic event clusters in the −100 m to +100 m range of the Zijinshan Gold and Copper Mine. Microseismic events predominantly concentrate in the −50 m to +100 m range of the ore body’s eastern wing, with active mining areas distributed near the microseismic event clusters. Notably, microseismic lgEI, displacement, and density nephograms of microseismic event exhibit distinct distribution patterns. In the middle section of the −50 m section, the 7# mining area experiences higher stress levels, relatively larger displacements, and a concentration of microseismic events. Consequently, this area presents a relatively higher risk of mining-related disasters. Field investigations into roadway surrounding rock damage have revealed instances of rib spalling, cracks, and other damage in roadway sections along the vein roadway w

关 键 词：地下采场 微震监测 岩体破坏 能量指数 位移 

分 类 号：TD324[矿业工程—矿井建设]