踏步式上向水平分层充填采矿法回采步距优化及应用
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摘要
针对机械化上向水平分层充填采矿法二步采场在进行回采作业时,一步采场充填体滤水而导致二步采场两帮围岩条件恶化的问题,提出并进行了踏步式上向水平分层充填采矿法的试验研究。以新城金矿V号矿体为工程背景,对踏步式上向水平分层充填采矿法的回采工艺设置不同的回采步距,结合Flac~(3D)数值模拟技术对回采过程进行模拟分析,并对回采过程中关键点的位移和应力进行综合比较,从而确定最佳回采步距,确保V号矿体的安全高效开采。结合不同工况下的应力位移分析结果最终确定采场参数,一步采场二步采场回采步距为20. 0 m,即一步采场超前二步采场6个分层。经工程应用表明,在试验采场得到了生产能力1 120 t/d、采矿损失率4. 6%、矿石贫化率4. 5%的经济技术指标。
The surrounding rock conditions of the second-step deteriorate due to the filtered water from the firststep stope in mechanized upward horizontal slicing and filling stoping. In light of that,the paper proposed and carried out experimental research on alternating-step upward horizontal slicing filling stoping method. The paper conducted the case study of V orebody of Xincheng Gold Mine,set up different step distance to the extraction process of the alternating-step upward horizontal slicing filling stoping,simulated and analyzed extraction process with Flac~(3D) numerical simulation technology,and compared the displacement and stress of key points in the extraction process,in order to determine optimal step distance and ensure safe and efficient extraction of V ore body. Based on the results of stress displacement analysis under different working status,the paper determined the step distance between first-step and second-step stope to be 20. 0 m,meaning that the optimal step distance is the first-step stope being 6 layers ahead of the second-step stope. The engineering application shows that the technical and economic index in experimental stope are:production capacity is 1 120 t/d,the mining loss rate is 4. 6 % and ore dilution rate is 4. 5 %.
The surrounding rock conditions of the second-step deteriorate due to the filtered water from the firststep stope in mechanized upward horizontal slicing and filling stoping. In light of that,the paper proposed and carried out experimental research on alternating-step upward horizontal slicing filling stoping method. The paper conducted the case study of V orebody of Xincheng Gold Mine,set up different step distance to the extraction process of the alternating-step upward horizontal slicing filling stoping,simulated and analyzed extraction process with Flac~(3D) numerical simulation technology,and compared the displacement and stress of key points in the extraction process,in order to determine optimal step distance and ensure safe and efficient extraction of V ore body. Based on the results of stress displacement analysis under different working status,the paper determined the step distance between first-step and second-step stope to be 20. 0 m,meaning that the optimal step distance is the first-step stope being 6 layers ahead of the second-step stope. The engineering application shows that the technical and economic index in experimental stope are:production capacity is 1 120 t/d,the mining loss rate is 4. 6 % and ore dilution rate is 4. 5 %.
引文
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[2]李树鹏,姜磊,张君鹏.盘区机械化上向水平分层充填采矿法在大尹格庄金矿的应用[J].黄金,2016,37(8):43-46.
[3]张骏丰.某缓倾斜中厚矿体磷矿地下开采方案与采场稳定性研究[D].武汉:武汉工程大学,2015.
[4]王湘桂,唐开元.矿山充填采矿法综述[J].矿业快报,2008(12):1-5.
[5]解世俊.金属矿床地下开采[M].北京:冶金工业出版社,1986.
[6]李兴尚,吴法春,许家林.上向水平分层充填采矿法的优化研究[J].金属矿山,2006(4):1-3,6.
[7]刘志君,龚浩源.上向水平分层充填采矿法的改进[C]∥中国有色金属学会.第八届国际充填采矿会议论文集.北京:中国有色金属学会,2004:4.
[8]苏振豪.某矿采场稳定性分析及回采顺序优化研究[D].赣州:江西理工大学,2017.
[9]尚振华,唐绍辉,焦文宇,等.基于FLAC3D模拟的大规模采空区破坏概率研究[J].岩土力学,2014,35(10):3 000-3 006.
[10]周伟永,饶运章,汪弘,等.基于FLAC3D的采场稳固性数值模拟研究[J].矿业研究与开发,2014,34(2):13-17.
[11]董金奎,冯夏庭,张希巍,等.地下采场破碎岩体稳定性评价与参数优化[J].东北大学学报(自然科学版),2013,34(9):1 322-1 326.
[12]郑友富,王洪武,曾晟,等.基于FLAC3D上向水平分层充填采矿法数值模拟[J].云南冶金,2008,37(4):10-13.
[13]薛一鸣.夏甸金矿大跨度采场稳定性数值分析与报警阈值研究[D].北京:北京科技大学,2010.