复杂应力条件下露天矿高边坡动态开采模拟与响应分析
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摘要
针对露天转地下开采边坡在双重应力作用下的稳定性问题,以某大型露天煤矿边坡北边帮为研究对象,借助数值模拟手段开展了不同工况下边坡在动态地下开采作用下的响应分析与稳定性评价。选取对矿区生产与安全影响较大的北边帮中部区域作为目标研究区,应用Midas Nx有限元软件,模拟边坡在井工开采前后、4#、9#煤工作面不同推进深度时的边坡动态响应。研究结果表明:采空区的存在会降低边坡的安全系数,并引起采空区覆岩的应力重分布,使上覆岩体产生变形破坏,影响边坡的稳定性,确定了采空区对边坡的影响程度与采空区的规模、位置有关,同时确定回采边线的位置对边坡的稳定性及资源采出率至关重要。
Aiming at the stability problem of slope for the transiton from open-pit to underground mining under double stress,taking the northern side slope of a large opencast coal mine as the research object, the response analysis of the slope under different working conditions and dynamic underground mining were carried out by means of numerical simulation and stability evaluation. Midas Nx finite element software is applied to simulate the central part of the northern margin of the coal mines, which has a great influence on mining production and safety in the target area. The dynamic response of the slopes was analyzed respectively considering the different depth of No.4 and No. 9 coal. The results show that the existence of goaf will reduce the safety factor of slope and cause the stress redistribution of overlying strata in goaf, which will cause deformation and failure of overlying rock mass and affect the stability of slope. The degree of influence on the slope is related to the size and location of the goaf. It is also important to determine the location of the mining side slope for slope stability and resource recovery rate.
Aiming at the stability problem of slope for the transiton from open-pit to underground mining under double stress,taking the northern side slope of a large opencast coal mine as the research object, the response analysis of the slope under different working conditions and dynamic underground mining were carried out by means of numerical simulation and stability evaluation. Midas Nx finite element software is applied to simulate the central part of the northern margin of the coal mines, which has a great influence on mining production and safety in the target area. The dynamic response of the slopes was analyzed respectively considering the different depth of No.4 and No. 9 coal. The results show that the existence of goaf will reduce the safety factor of slope and cause the stress redistribution of overlying strata in goaf, which will cause deformation and failure of overlying rock mass and affect the stability of slope. The degree of influence on the slope is related to the size and location of the goaf. It is also important to determine the location of the mining side slope for slope stability and resource recovery rate.
引文
[1]赵建军,蔺冰,马运韬,等.缓倾煤层采空区上覆岩体变形特征物理模拟研究[J].煤炭学报,2016,41(6):1369-1374.
[2]许超,吕义清,周泽文,等.采动滑坡变形机理分析[J].煤炭技术,2017,36(11):164-166.
[3]王振伟,张青波,刘天苹,等.地下开采引起覆岩破坏及边坡变形的数值模拟[J].煤矿安全,2014,45(2):207-211.
[4]孙世国,郭炜晨,刘文波,等.露天转地下开采诱发高边坡滑移机制研究[J].金属矿山,2015(5):162-165.
[5]郝长胜,郭天中.露井联采条件下边坡移动变形规律分析[J].煤炭技术,2014,33(11):124-126.
[6]E Bakhtavar. Transition from open-pit to underground in the case of Chah-Gaz iron ore combined mining[J]. Journal of Mining Science, 2013, 49(6):955.
[7]E Bakhtavar, K Shahriar, K Oraee. Transition from open-pit to underground as a new optimization challenge in mining engineering[J]. Journal of Mining Science, 2009, 45(5):485-494.
[9]周霞,李辉,杨建英.采空区上覆岩质高边坡变形机理研究[J].长江科学院院报,2013,30(10):66-71.
[9]常来山,陈思玮,李绍臣,等.平朔矿区露井联采边坡岩体采动损伤规律研究[J].煤炭工程,2015,47(1):95-97.
[10]柴红保,曹平,柴国武,等.采空区对边坡稳定性的影响[J].中南大学学报(自然科学版),2010,41(4):1528-1534.
[11]李同鹏,胡崴,张欣,张程.某矿地下采空区对边坡稳定性影响的研究[J].金属矿山,2017(9):52-55.
[12]孙世国,张玉娟,苗子臻,等.露天转地下开采对边坡稳定性的影响[J].金属矿山,2016(7):171-174.
[13]孙世国,张玉娟,张英海,等.露天转地下L型工作面开采上覆岩体稳定性分析及边坡治理方案[J].煤矿安全,2016,47(9):158-161.
[14]许名标,夏岸雄.采空区对边坡稳定性的数值模拟研究[J].矿业研究与开发,2016,36(9):50-54.
[15]朱建明,张宏涛,周保精,等.井工开采对露井联采边坡稳定影响的塑性极限分析[J].岩土工程学报,2010,32(3):344-350.
[16]朱建明.安太堡矿露井联采边坡稳定性研究及其边界参数优化[C]∥第八届全国工程地质大会论文集.北京:中国地质学会工程地质专业委员会,2008:8.
[17]肖林京,范亚敏,崔伟强,等.露天转地下开采对边坡稳定性的影响研究[J].煤炭技术,2016,35(8):140.
[2]许超,吕义清,周泽文,等.采动滑坡变形机理分析[J].煤炭技术,2017,36(11):164-166.
[3]王振伟,张青波,刘天苹,等.地下开采引起覆岩破坏及边坡变形的数值模拟[J].煤矿安全,2014,45(2):207-211.
[4]孙世国,郭炜晨,刘文波,等.露天转地下开采诱发高边坡滑移机制研究[J].金属矿山,2015(5):162-165.
[5]郝长胜,郭天中.露井联采条件下边坡移动变形规律分析[J].煤炭技术,2014,33(11):124-126.
[6]E Bakhtavar. Transition from open-pit to underground in the case of Chah-Gaz iron ore combined mining[J]. Journal of Mining Science, 2013, 49(6):955.
[7]E Bakhtavar, K Shahriar, K Oraee. Transition from open-pit to underground as a new optimization challenge in mining engineering[J]. Journal of Mining Science, 2009, 45(5):485-494.
[9]周霞,李辉,杨建英.采空区上覆岩质高边坡变形机理研究[J].长江科学院院报,2013,30(10):66-71.
[9]常来山,陈思玮,李绍臣,等.平朔矿区露井联采边坡岩体采动损伤规律研究[J].煤炭工程,2015,47(1):95-97.
[10]柴红保,曹平,柴国武,等.采空区对边坡稳定性的影响[J].中南大学学报(自然科学版),2010,41(4):1528-1534.
[11]李同鹏,胡崴,张欣,张程.某矿地下采空区对边坡稳定性影响的研究[J].金属矿山,2017(9):52-55.
[12]孙世国,张玉娟,苗子臻,等.露天转地下开采对边坡稳定性的影响[J].金属矿山,2016(7):171-174.
[13]孙世国,张玉娟,张英海,等.露天转地下L型工作面开采上覆岩体稳定性分析及边坡治理方案[J].煤矿安全,2016,47(9):158-161.
[14]许名标,夏岸雄.采空区对边坡稳定性的数值模拟研究[J].矿业研究与开发,2016,36(9):50-54.
[15]朱建明,张宏涛,周保精,等.井工开采对露井联采边坡稳定影响的塑性极限分析[J].岩土工程学报,2010,32(3):344-350.
[16]朱建明.安太堡矿露井联采边坡稳定性研究及其边界参数优化[C]∥第八届全国工程地质大会论文集.北京:中国地质学会工程地质专业委员会,2008:8.
[17]肖林京,范亚敏,崔伟强,等.露天转地下开采对边坡稳定性的影响研究[J].煤炭技术,2016,35(8):140.