大跨度沿空回采巷道底鼓防治技术研究
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摘要
针对大跨度沿空回采巷道发生的非对称性底鼓现象,以赵固二矿11131工作面下顺槽为背景,建立力学模型,并分析底鼓机理,认为巷道两帮受集中应力的差异是造成非对称性底鼓的主导因素。采用底角锚杆联合底板注浆支护和底板全锚杆支护两种方案控制底鼓,结果表明:方案一使底鼓量降低约70%,方案二使底鼓量降低约55%,且都能使非对称性底鼓造成的底板倾斜角度从最大6°减小为最大2°,有效控制了非对称性底鼓的发生,确保了大跨度沿空回采巷道的底板稳定。
Aiming at asymmetric floor heave phenomenon occurred at large span mining gateway along gob, based on under cross heading of the No. 11131 working face in Zhaogu No. 2 Mine, the mechanical model is established and the mechanism of floor heave is analyzed and it is suggested that the dominant factor of asymmetric floor heave phenomenon is the difference of concentrated stress between two-side of mine gateway. Two supporting schemes, floor corner anchor combing floor grouting and floor total-length anchor, were adopted to control the floor heave. The result showed that the amount of floor heave has been reduced respectively about 70% and 55%by the first and second scheme. The floor inclination angle caused by asymmetric floor heave has been reduced from maximum 6°to maximum 2°by two schemes.The asymmetric floor heave has been controlled effectively and the floor stabilization of large span mining gateway has been guaranteed.
Aiming at asymmetric floor heave phenomenon occurred at large span mining gateway along gob, based on under cross heading of the No. 11131 working face in Zhaogu No. 2 Mine, the mechanical model is established and the mechanism of floor heave is analyzed and it is suggested that the dominant factor of asymmetric floor heave phenomenon is the difference of concentrated stress between two-side of mine gateway. Two supporting schemes, floor corner anchor combing floor grouting and floor total-length anchor, were adopted to control the floor heave. The result showed that the amount of floor heave has been reduced respectively about 70% and 55%by the first and second scheme. The floor inclination angle caused by asymmetric floor heave has been reduced from maximum 6°to maximum 2°by two schemes.The asymmetric floor heave has been controlled effectively and the floor stabilization of large span mining gateway has been guaranteed.
引文
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[11]申海龙,万首成.沿空留巷联合加强支护技术在综采工作面的应用[J].煤炭科技,2018(3):81-83.
[12]王磊.单翼平区迎压掘进巷道围岩变形综合治理研究与应用[J].煤炭科技,2018(3):84-85.
[2]刘成,宋选民,刘叶,等.大断面回采巷道层状底板底臌机理及其防治对策[J].煤炭学报,2014,39(6):1 049-1 055.
[3]何满潮,张国锋,王桂莲,等.深部煤巷底臌控制机制及应用研究[J].岩石力学与工程学报,2009,28(S1):2 593-2 598.
[4]杨本生,耿学良,孙利辉.五阳矿厚煤层巷道底鼓机制及控制研究[J].采矿与安全学报,2012,29(1):8-13.
[5]姜耀东,赵毅鑫,刘文岗,等.深部开采中巷道底鼓问题的研究[J].岩石力学与工程学报,2004,23(14):2 396-2 401.
[6]高明中,井欢庆.巷道非对称性底鼓的力学解析[J].安徽理工大学学报(自然科学版),2012,32(4):38-43.
[7]黎开勋,党昌志.巷道底鼓分析及控制[J].煤炭工程,2008(9):51-52.
[8]贾俊峰.煤巷片帮类型及锚固机理研究[J].太原理工大学学报,2005,(1):96-98.
[9]金桃,陈阳,许磊.层间距对采空区下巷道稳定性影响分析[J].煤矿安全,2011,42(7):161-164.
[10]赵启峰,高文蛟,牛国星,等.综放大断面回采巷道底鼓诱因分析及控制技术[J].煤炭工程,2014,46(6):39-42.
[11]申海龙,万首成.沿空留巷联合加强支护技术在综采工作面的应用[J].煤炭科技,2018(3):81-83.
[12]王磊.单翼平区迎压掘进巷道围岩变形综合治理研究与应用[J].煤炭科技,2018(3):84-85.