不同岩性顶板跨度稳定性数值模拟研究  

Stability of different rock properties on the roof of a metal mine varies

作　　者：彭跃金 王扶成 PENG Yuejin;WANG Fucheng(Changsha Institute of Mining Research Co.,Ltd.,Changsha 410012,China;National Engineering Research Center for Metal Mining,Changsha 410012,China;Anhui Conch Cement Co.,Ltd.,Chizhou 247100,China)

机构地区：[1]长沙矿山研究院有限责任公司,湖南长沙410012 [2]国家金属采矿工程技术研究中心,湖南长沙410012 [3]安徽海螺水泥股份有限公司,安徽池州247100

出　　处：《中国矿业》2024年第S02期274-278,共5页China Mining Magazine

基　　金：“十四五”国家重点研发计划项目“复杂低品位多金属资源露天地下协同高效开采技术”资助(编号:2022YFC2905102)。

摘　　要：某多金属地下矿山顶板岩性不同,分别为炭质板岩、流纹质碎屑岩、凝灰质板岩等,为了解不同岩性顶板条件下,采场跨度在哪个区间相对稳定,为矿山回采时的采场结构参数做参考,采用数值模拟对不同岩性、不同跨度条件下的采场稳定性进行了分析。结果显示:不管任何岩性的顶板,随着采场跨度的不断增加,顶板及侧帮呈现不同阶段的破坏过程;炭质板岩在跨度为7 m时,顶板压应力超过了其极限抗压强度,此时顶板已产生破坏,且在跨度为6~7 m时,其顶板应力斜率较之前有所增加,说明跨度在6~7 m之间,顶板压力处于加速失稳期,因此炭质板岩的采场跨度应在6 m及以下是稳定的;同理,流纹质碎屑岩及凝灰质板岩也呈现同样的破坏规律,流纹质碎屑岩采场跨度应在7 m及以下,凝灰质板岩采场跨度应在6 m及以下。同时针对不同采场给出了相应的支护措施,以确保矿山的安全稳定生产。The roof lithology of a polymetallic underground mine is different,including carbonaceous slate,rhyolitic clastic rock,tuffaceous slate,etc.In order to understand which section of the stope span is relatively stable under the roof conditions of different lithology,and to provide a reference for stope structural parameters during mining,numerical simulation was used to analyze the stope stability under different lithology and different span conditions.The results show that regardless of the lithology of the roof,as the span of the mining area increases,the roof and side walls exhibit different stages of failure processes;When the span of carbonaceous slate is 7 m,the top plate compressive stress exceeds its ultimate compressive strength,and the top plate has already been damaged.Moreover,when the span is 6-7 m,the slope of the top plate stress has increased compared to before,indicating that the top plate pressure is in an accelerated instability period between 6-7 m.Therefore,the mining span of carbonaceous slate should be stable at 6m or below;Similarly,both rhyolite clastic rocks and tuffaceous slate exhibit the same failure pattern.The span of the rhyolite clastic rock mining site should be 7 m or less,and the span of the tuffaceous slate mining site should be 6 m or less.At the same time,corresponding support measures were provided for different mining sites to ensure the safe and stable production of the mine.

关 键 词：多金属矿 岩性 数值模拟 稳定性分析 破坏过程 

分 类 号：TD862[矿业工程—金属矿开采]