变基床系数条件下充填采煤工作面顶板力学机制分析
Mechanical Mechanism of Working Face Roof Under Variable Coefficient of Subgrade Reaction in Filling Mining
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摘要: 为指导充填开采及工作面顶板控制措施提供理论依据,以榆阳煤矿风积砂似膏体充填开采为工程背景,考虑了工作面前方煤体破碎区基床系数为非恒定常数,同时,考虑了充填体基床系数随龄期增长而变化特征,建立了工作面顶板变基床系数弹性地基梁模型,利用有限差分原理对该模型进行计算,分析了顶板的挠度和弯矩分布规律,并提出了应对工作面顶板冒顶的防控措施。研究结果表明:顶板挠度在待充区上方最大,在控顶区上方最小,并随充填体基床系数的增加而降低;顶板弯矩在控顶区和待充区范围内变化剧烈,易造成顶板弯剪破坏。Abstract: To provide theoretical basis for guiding filling mining and roof control measures of working face, based on the engineering background of wind-blown sand paste filling mining in Yuyang Coal Mine, the foundation bed coefficient of the broken coal body area in front of the working face is considered to be an unsteady constant. At the same time, considering the changing characteristics of the foundation bed coefficient of backfill body with the age, the elastic foundation beam model with variable foundation bed coefficient of roof of working face is established. It is calculated by finite difference method and the distribution laws of roof deformation and bending moment were analyzed. In addition, the prevention and control measures to cope with the failure of the roof caving were proposed. The results show that the maximum deflection of roof is above the area waiting for filling, and the minimum one is above roof-control area, and it decreased with the increase of the variable coefficient of subgrade reaction. It was easy to cause bending shear failure of roof because bending moment was varied violently in the range of roof-control area and waiting for filling area.
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[1] 刘建功,赵家巍,李蒙蒙,等.充填开采连续曲形梁形成与岩层控制理论[J].煤炭学报,2016,41(2):383. [2] 冯强,刘炜炜,伏圣岗,等.基于弹性地基梁采场坚硬顶板变形与内力的解析计算[J].采矿与安全工程学报,2017,34(2):342-348. [3] 冯锐敏,丁自伟,石磊,等.膏体充填弹性地基梁模型分析及应用[J].金属矿山,2013(1):1-6. [4] 常庆粮.膏体充填控制覆岩变形与地表沉陷的理论研究与实践[D].徐州:中国矿业大学,2009. [5] 陈杰,杜计平,张卫松,等.矸石充填采煤覆岩移动的弹性地基梁模型分析[J].中国矿业大学学报,2012, 41(1):14-19. [6] 徐平,周跃进,张敏霞,等.厚松散层薄基岩充填开采覆岩裂隙发育分析[J].采矿与安全工程学报,2015, 32(4):617-622. [7] 李猛,张吉雄,姜海强,等.固体密实充填采煤覆岩移动弹性地基薄板模型[J].煤炭学报,2014,39(12):2369-2373. [8] 许猛堂,张东升,马立强,等.超高水材料长壁充填开采顶板控制技术[J].煤炭学报,2014,39(3):410. [9] 谢生荣,陈冬冬,郜明明,等.充填采煤弹性基础边界基本顶薄板破断规律[J].煤炭学报,2017,42(9):2270-2279. [10] 孙凯华,刘鹏亮,孙万明,等.风积沙似膏体煤矿充填材料的研究及应用[J].金属矿山,2016(4):172. [11] 龙驭球.弹性地基梁的计算[M].北京:高等教育出版社,1981. [12] 高大钊.土力学与地基基础[M].北京:中国建筑工业出版社,1998. [13] 孙旻,徐伟.软土地层管幕法施工三维数值模拟[J].岩土工程学报,2006,28(增1):1497-1500. [14] 仲锁庆,张西平,潘海利.地基土基床系数研究[J].地下空间与工程学报,2005(7):1109-1112. [15] 郑俊杰,章荣军,杨庆年.浅埋隧道变基床系数下管棚的力学机制分析[J].岩土工程学报,2009,31(8):1165-1171.
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