摘要
镜铁山矿Ⅰ#矿体向下延伸时倾角由急倾斜变为倾斜,若继续按照急倾斜矿体的回采方式布置采切工程,将会在矿体上盘或者下盘处残留三角形边角矿,进而导致矿石损失率增大。为有效解决因矿体倾角缓化出现的三角区域矿体难以回收的问题,首先提出了脉内布置分段沿脉巷和沿矿岩边界布置分段沿脉巷两类回采方案,其中脉内布置分段沿脉巷回采方案设计了15°、30°、45°3种不同中深孔边孔角布置方案;然后分别从中深孔施孔精度要求、中深孔施工适应性、对矿体条件适应性、生产效率等4个方面定性分析了不同回采方案的优劣性;最后整合生产效率、施工适应性、通风效果、井巷工程量、工期和成本等12个指标组成优选评价体系,采用层次分析法(Analytic Hierarchy Process,AHP)构建了倾斜矿体上盘边角矿回采方案层次分析优选模型。计算得到3种脉内布置分段沿脉巷与沿矿岩边界布置回采方案的最终评价值分别为0.213、0.201、0.198和0.388,结果表明:沿矿岩边界布置分段沿脉巷为最优回采方案。实践表明:优选出的方案在实践中取得了理想效果,经济效益显著,可满足该矿倾斜矿体上盘边角矿回采需求。研究结果可为类似开采条件矿山的边角矿回采提供有益参考。
When the I#ore body of Jingtieshan Mine extends downward,the dip angle changes from steep to inclined.If the mining and cutting projects are continued according to the mining method of the steeply inclined ore body,the triangle corner ores will be left on the upper or lower part of the ore body,which in turn leads to an increase in ore loss rate. In order to effectively solve the problem of difficult recovery of the ore body in the triangle area due to the dip angle reduction of the ore body,firstly,two types of mining schemes were proposed to arrange the reef drifts along the orebody trend and along the boundary,in which the reef drifts arrangement three different medium-deep hole-edge hole angle layout schemes of 15°,30°,and 45°. Then,the advantages and disadvantages of different mining schemes of four schemes were analyzed qualitatively from four aspects such as the accuracy requirements of the medium-deep hole,the adaptability of the mediumdeep hole construction,the ore body condition adaptability and production efficiency qualitatively. Finally,integrate the production efficiency,construction adaptability,ventilation effect,engineering quantity,construction period and cost,etc.,the analytic hierarchy process(AHP)is used to construct the analytic optimization model for the hanging wall residual orebody of the inclined orebody mining scheme. The final evaluation values of the three schemes of sublevel drifts along orebody trend and along the orebody boundary scheme are calculated to be 0.213,0.201,0.198 and 0.388,respectively. The results show that sublevel drifts along the orebody boundary is the best mining program. The practice results show that the selected scheme in Jingtieshan Mine has achieved ideal results with significant economic benefits,and meet the mining demand of the inclined ore body. The above study results can provide useful reference for the mining of residual orebody under the similar mining conditions.
作者
龚文柏
吴万君
Gong Wenbai;Wu Wanjun(Jingtieshan Mine,Jiugang Hongxin Co.,Ltd.,Jiayuguan 735100,China)
出处
《金属矿山》
CAS
北大核心
2020年第7期40-46,共7页
Metal Mine
关键词
地下开采
倾斜矿体
边角矿
分段崩落法
回采方案
Underground mining
Inclined orebody
Corner ores
Sublevel caving method
Mining scheme
