固体充填条带开采采宽与留宽优化设计
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摘要
针对南屯煤矿采用全采全充模式的固体充填开采无法控制地表沉陷的问题,分析了矿区采用固体充填条带开采的必要性,推导了充填体作用下的煤柱屈服区宽度力学计算公式,提出了顾及煤柱稳定性的留宽设计方法,并推导了采出率与地表变形的数学表达式;采用数值模拟研究了煤柱应力集中系数的变化规律,为力学模型的参数选取提供了支持。结合理论分析和数值模拟的研究成果,对固体充填条带开采的采留宽进行优化设计。研究结果表明:当矿区固体充填条带开采的采宽为53m、留宽为25m时,可较好地控制地表变形、保证煤柱的稳定性和提高资源的采出率。
According to the problem that the surface subsidence cannot be controlled in Nantun Mine with full mining and backfilling mode of solid backfill mining. The necessity of solid backfilling strip mining is analyzed,the yield zone width of coal pillar under the action of backfill is deduced. The design method of width considering the stability of coal pillar is presented. The mathematical expressions of recovery rate and surface deformation are derived. The variation law of the stress concentration coefficient of coal pillar is studied,which supports the parameter selection of the mechanical model. Combining the results of theoretical analysis and numerical simulation,the mining width and coal pillar size of solid backfilling strip mining are optimized. Results show that when the mining width is 53 m and the coal pillar width is 25 m,surface deformation is controlled,ensuring stability of coal pillar and improving resource recovery rate.
According to the problem that the surface subsidence cannot be controlled in Nantun Mine with full mining and backfilling mode of solid backfill mining. The necessity of solid backfilling strip mining is analyzed,the yield zone width of coal pillar under the action of backfill is deduced. The design method of width considering the stability of coal pillar is presented. The mathematical expressions of recovery rate and surface deformation are derived. The variation law of the stress concentration coefficient of coal pillar is studied,which supports the parameter selection of the mechanical model. Combining the results of theoretical analysis and numerical simulation,the mining width and coal pillar size of solid backfilling strip mining are optimized. Results show that when the mining width is 53 m and the coal pillar width is 25 m,surface deformation is controlled,ensuring stability of coal pillar and improving resource recovery rate.
引文
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[3]张兆威.基于绿色部分充填采煤的保水开采技术研究[J].煤炭工程,2018,50(1):105-107.
[4]王磊,李楠,张鲜妮.浅埋煤层条带开采固体充填地表沉陷定量控制方法[J].煤矿安全,2015,46(11):31-34.
[5]孟毅,庞振忠,张新国,等.厚黄土层矿区建(构)筑物下条带开采合理尺度设计方法[J].煤炭工程,2017,49(10):48-51.
[6]余学义,刘樟荣,赵兵朝,等.王家沟煤矿条带充填开采导水裂隙发育规律研究[J].煤炭工程,2015,47(5):83-86.
[7]郭惟嘉,王海龙,刘增平.深井宽条带开采煤柱稳定性及地表移动特征研究[J].采矿与安全工程学报,2015,32(3):369-375.
[8]许家林,尤琪,朱卫兵,等.条带充填控制开采沉陷的理论研究[J].煤炭学报,2007,32(2):119-122.
[9]安百富,张吉雄,李猛,等.充填回收房式煤柱采场煤柱稳定性分析[J].采矿与安全工程学报,2016,33(2):238-243.
[10]朱晓峻.带状充填开采岩层移动机理研究[D].徐州:中国矿业大学,2016.
[11]谷拴成,张新蕾,李鑫.条带开采充填对煤柱稳定性影响分析[J].煤炭技术,2015,34(12):1-4.
[12]侯朝炯,马念杰.煤层巷道两帮煤体应力和极限平衡区的探讨[J].煤炭学报,1989(4):21-29.
[13]钱鸣高,石平五.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2003.
[14]拓万兵,吴凤民.建筑物下条带开采设计方法研究[J].煤炭工程,2012,44(11):10-12.