坚硬顶煤弱化对放顶煤开采的影响
Influence of Hard Top Coal Weakening on Caving Mining
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摘要: 采用离散元方法，从试验和数值模拟获取煤体宏观-微观力学参数后，建立放顶煤开采模型，分析弱化前后顶煤的落放过程及落放形态特征。结果表明：煤体弱化极大减小了其宏观-微观力学参数，注水弱化或爆破弱化后坚硬顶煤颗粒的黏结力仅为未弱化时的63%和55%左右；注水或爆破顶煤放出量差别明显，注水或爆破弱化后顶煤放出率分别为82.6%和89.43%，而弱化前放出率仅有54.47%。Abstract: In this paper, discrete element method is used to obtain macro and micro mechanical parameters of coal from experiment and numerical simulation. Hard top-coal caving mining model is established to analyze coal falling process and dropping shape before and after weakening. The research results show that macro and micro mechanical parameters are reduced greatly after weakening hard top-coal, and after water injection and blasting in hard top-coal, the bonding force of coal particles is only 63% and 55% of that before weakening. Water injection or blasting in hard top-coal weakens significantly the tension among the coal particles, and the released amount of top coal after weakening is much larger than that before weakening. After water injection weakening top coal, the top coal recovery rate reaches 82.6%, and after blasting weakening top coal, the top coal recovery rate reaches 89.43%, while the top coal recovery rate is only 54.47% without weakening measures.
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[1] 刘健,刘泽功,高魁,等.深孔爆破在综放开采坚硬顶煤预先弱化和瓦斯抽采中的应用[J].岩石力学与工程学报,2014,33(S1):3361-3367. [2] 索永录,孙书亮,段王拴,等.高瓦斯综放面预先爆破弱化坚硬顶煤试验[J].煤炭科学技术,2009,37(3):1-3. [3] 谷拴成,于远祥,朱彬.坚硬顶煤预裂爆破弱化的数值模拟分析[J].矿业安全与环保,2008,35(2):36-38. [4] 孙兴林,窦林名,张士斌,等.水力致裂弱化坚硬顶板现场试验研究[J].煤矿安全,2011,42(5):16-19. [5] 黄炳香.煤岩体水力致裂弱化的理论与应用研究[D].徐州：中国矿业大学，2009. [6] 索永录.坚硬顶煤弱化爆破的宏观损伤破坏程度研究[J].岩土力学,2005,26(6):893-895. [7] 张晋鄂.坚硬煤层放顶煤注水弱化研究[J].山东煤炭科技,2014(11):25-27. [8] 康天合,张建平,白世伟.综放开采预注水弱化顶煤的理论研究及其工程应用[J].岩石力学与工程学报,2004,23(15):2615-2621. [9] 郭海防.水压力作用下煤岩损伤弱化规律研究[D].西安：西安科技大学, 2010. [10] 刘健,刘泽功,高魁,等.深孔爆破在综放开采坚硬顶煤预先弱化和瓦斯抽采中的应用[J].岩石力学与工程学报，2014,33(S1):3361-3367. [11] 郭德勇,商登莹,吕鹏飞,等.深孔聚能爆破坚硬顶板弱化试验研究[J].煤炭学报,2013,38(7):1149. [12] 张杰.浅埋煤层顶板深孔预爆强制初放研究[J].采矿与安全工程学报,2012,29(3):339-343. [13] 索永录.综放开采大放高坚硬顶煤预先弱化方法研究[J]. 煤炭学报,2001,26(6):616-620. [14] 李凤颖.煤岩力学性质的离散元数值模拟及应用探讨[D].成都:成都理工大学, 2012. [15] 陶连金,蒯本秋,张波.松散软岩巷道破坏的颗粒离散元模拟分析[J].地下空间与工程学报,2010,6(2):318-322.
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