某矿分段充填法采场结构参数优化及工程应用
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摘要
采场结构参数既影响矿山的生产能力,又关系着开采安全。针对某矿分段充填法的采场结构参数采用数值模拟方法进行计算分析,优选安全合理的采场参数。以开采过程中顶板、上中段充填体及上盘围岩的变形特征为指标分析各结构参数下的采场稳定性,提出建议的参数。结果表明,当顶柱厚度为3m时,上盘揭露原岩与顶板交接处会产生塑性贯通区;当顶柱厚度为5m时,长度小于30m的采场顶板稳定性好;当顶柱厚度为7 m时,采场顶板均安全;长度为20～30m的采场上盘围岩最大位移量约为10mm,而40m长度采场其最大位移可达到40.0mm左右。按照优选的结果开展工业试验,结果表明,开挖后的采场顶板和上盘围岩能整体能保持自稳,稳定性较好。因此,建议顶柱厚度设计5m,采场长度选择30m。
Stope structural parameters not only affect the production capacity of mines,but also relate to mining safety.According to the stope structure parameters of sublevel filling method in a mine,the numerical simulation method was used to calculate and analyze,so as to optimize the safe and reasonable stope parameters.Based on the deformation characteristics of roof,upper and middle filling body,as well as hanging wall during mining,the stope stability under various structural parameters was analyzed,and the recommended parameters were put forward.The results showed that when the thickness of the top pillar was 3 m,the plastic transfixion zone would be formed at the junction of the original rock of the hanging wall and the roof.When the thickness of the top pillar was 5 m,the stope roof with length less than 30 m was stable.When the thickness of the top pillar was 7 m,the stope roof was safe.The maximum displacement of the hanging wall was about 10 mm in the stope with the length of 20～30 m,and would reach about 40.0 mm in the stope with the length of 40 m.According to the optimized results,industrial tests were carried out.The results indicated that the roof and hanging wall in the excavated stope could keep good self-stability overall.Therefore,it was suggested that the thickness of top pillar should be 5 mand the length of stope should be 30 m.
Stope structural parameters not only affect the production capacity of mines,but also relate to mining safety.According to the stope structure parameters of sublevel filling method in a mine,the numerical simulation method was used to calculate and analyze,so as to optimize the safe and reasonable stope parameters.Based on the deformation characteristics of roof,upper and middle filling body,as well as hanging wall during mining,the stope stability under various structural parameters was analyzed,and the recommended parameters were put forward.The results showed that when the thickness of the top pillar was 3 m,the plastic transfixion zone would be formed at the junction of the original rock of the hanging wall and the roof.When the thickness of the top pillar was 5 m,the stope roof with length less than 30 m was stable.When the thickness of the top pillar was 7 m,the stope roof was safe.The maximum displacement of the hanging wall was about 10 mm in the stope with the length of 20～30 m,and would reach about 40.0 mm in the stope with the length of 40 m.According to the optimized results,industrial tests were carried out.The results indicated that the roof and hanging wall in the excavated stope could keep good self-stability overall.Therefore,it was suggested that the thickness of top pillar should be 5 mand the length of stope should be 30 m.
引文
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[8]李建华.支护结构内力测试在确定隧道容许位移量上的应用探讨[J].隧道建设,2009,29(6):601-604.
[2]张飞,杨天鸿,胡高建.复杂应力扰动下围岩稳定性评价与采场参数优化[J].东北大学学报(自然科学版),2018,39(5):699-704.
[3]程三建.分段空场嗣后充填采场结构参数优化试验与理论研究[D].赣州:江西理工大学,2015.
[4]唐礼忠,邓丽凡,翦英骅.分段空场嗣后充填采矿法采场结构参数优化研究[J].黄金科学技术,2016,24(2):8-13.
[5]王小宁,蔡嗣经,覃星朗.新疆某金矿分段充填法采场结构参数优化[J].矿业研究与开发,2018,38(3):1-5.
[6]刘志义,张丽春,赵国彦,等.基于FLAC3D的二步采场结构参数优化及工程应用[J].金属矿山,2015(10):6-10.
[7]兰明,刘志祥,李夕兵,等.中深孔崩矿阶段嗣后充填法采场结构参数优化[J].中南大学学报(自然科学版),2018,49(4):933-939.
[8]李建华.支护结构内力测试在确定隧道容许位移量上的应用探讨[J].隧道建设,2009,29(6):601-604.