梅山铁矿塌落界线外残留矿体开采技术研究
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摘要
针对梅山铁矿塌落界线外矿体开采技术的特点,提出了采用分段空场嗣后充填法,分析了底部结构的布置和回采工艺特点等,并结合自然平衡拱理论,采用计算机仿真模拟技术,对分段空场嗣后充填法回采过程中的围岩应力、位移变化规律及塑性区分布情况进行了计算分析,揭示出顶板岩层拉应力是影响该采场稳定性至关重要的因素。将顶板岩层所受的最大拉应力作为衡量采场稳定性的指标,应用正交试验法对不同采场结构参数进行优化,得出梅山铁矿塌落界线外矿体采用矿房采场跨度14 m、矿柱采场跨度10 m和顶板厚度8 m的结构参数,能保证安全开采的需要。
Aim at the condition of mining over collapse borderline in Meishan Iron Mine,and base on the natural equilibrious arch theory with computer simulation technology,this article study on preferences of sublevel open-stope succeed by fill and bottom structure of stope disposition,as well as the technics characteristic of this mining method,analyzed wall rock stress and displacement variation rule and plastic zone distribution,educed the roof terrane tensile stress is the key factor of effect stope stability.Then,use the index of maximum tensile stress of roof terrane bear ability to scale the stope stability,and optimized the stope structure parameters by orthogonal test.At the last,this study gained the parameters of 14m room stope width,10m pillar stope width and 8m roof thickness can satisfy the mining over collapse borderline in Meishan Iron Mine.
Aim at the condition of mining over collapse borderline in Meishan Iron Mine,and base on the natural equilibrious arch theory with computer simulation technology,this article study on preferences of sublevel open-stope succeed by fill and bottom structure of stope disposition,as well as the technics characteristic of this mining method,analyzed wall rock stress and displacement variation rule and plastic zone distribution,educed the roof terrane tensile stress is the key factor of effect stope stability.Then,use the index of maximum tensile stress of roof terrane bear ability to scale the stope stability,and optimized the stope structure parameters by orthogonal test.At the last,this study gained the parameters of 14m room stope width,10m pillar stope width and 8m roof thickness can satisfy the mining over collapse borderline in Meishan Iron Mine.
引文
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[2]吴法春,邓水源.分段空场嗣后一次充填采矿法在新桥硫铁矿的应用[J].矿业快报,2002(1):4-5.
[3]刘培正,张传信.厚大矿体分段空场嗣后充填采场结构参数优化研究[J].金属矿山,2009(11):10-13.
[4]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005.
[5]周维垣,杨强.岩石力学数值计算方法[M].北京:中国电力出版社,2005.
[6]冯英华,胡强国,周志燕,等.松散岩体在采空区内应力状态的数值模拟研究[J].淮南职业技术学院学报,2006(1):36-39.
[7]缪协兴.自然平衡拱与巷道围岩的稳定[J].矿山压力与顶板管理,1990(2):55-57.
[8]夏峰.地下硐室围岩松动圈影响因素分析[D].北京:中国地震工程力学研究所,2009.
[9]王国富,王志忠.应用统计[M].长沙:中南大学出版社,2003.
[10]秦绍兵.中深孔回采爆破参数的正交试验优化研究[J].冶金矿山设计与建设,2000,32(6):3-6.
[11]陈勇.梅山铁矿上覆岩体塌陷与错动机理研究[J].金属矿山,2004(5):12-16.
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