煤层底板采动破坏特征流固耦合分析
Fluid-solid Coupling Analysis of Coal Seam Floor Failure Features
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摘要: 以山西龙矿盘道煤业有限公司2#煤层的采场条件为工程背景，基于FLAC3D数值仿真软件对工作面回采过程中煤层底板采动破坏特征进行流固耦合数值模拟。研究表明：煤层回采后，采空区底板垂直应力呈“半椭圆”形。采空区底板垂直位移呈“环状”分布，且采空区底板下方10 m内垂直位移受采动影响较大，采空区底板塑性区大致形成了一个平底“碗状”破坏形态，采空区中部底板岩体受水平采动应力影响较大，以剪切破坏为主。采空区两端煤壁附近底板受支承压力影响较大，以拉张破坏为主。Abstract: Taking the stope conditions of No.2 coal seam in Shanxi Longkuang Pandao Coal Company as the engineering background, FLAC3D is used to conduct numerical simulation of fluid-solid for floor failure features in the working face advancing process. The research shows that vertical stress of gob roof is “semi-elliptical” shape after coal seam mining. Vertical displacement of gob roof is “annular” distribution, and vertical displacement below gob roof within 10 m is greatly influenced by mining; gob floor plastic zone forms a roughly flat “bowl” failure pattern; rock mass in the middle of the gob floor is greatly influenced by horizontal stress, given priority to shear failure. The floor near the coal wall on both ends of gob roof is greatly influenced by abutment pressure, given priority to tensile failure.
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Keywords:
- FLAC3D /
- fluid-solid interaction /
- numerical modeling /
- floor mining /
- failure characteristic
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[1] 张金才,张玉卓,刘天泉. 岩体渗流与煤层底板突水[M]. 北京:地质出版社,1997. [2] 王作宇,刘鸿泉. 承压水上采煤[M]. 北京:煤炭工业出版社,1992. [3] 孙建,王连国,唐芙蓉,等. 倾斜煤层底板破坏特征的微震监测[J]. 岩土力学,2011,32(5):1589-1595. [4] 司荣军,王春秋,谭云亮. 采场支承压力分布规律的数值模拟研究[J]. 岩土力学,2007,28(2):351-354. [5] 王连国,韩猛,王占盛,等. 采场底板应力分布与破坏规律研究[J]. 采矿与安全工程学报,2013,30(3):317-322. [6] 李沛涛,武强. 底板破坏型采煤工作面突水机理及治理技术[J]. 辽宁工程技术大学学报(自然科学版),2008,27(5):653-656. [7] 刘伟韬,曹光全,申建军,等. 底板采动破坏深度实测与模拟[J]. 辽宁工程技术大学学报(自然科学版),2013;32(12):1585-1589. [8] SANTOS,C F,BIENIAWSKI,Z T.Floor design in underground coal mines[J]. International Journal of Rock Mechanics and Rock Engineering,1989,22(4):249-271. [9] 张培森. 采动条件下底板应力场及变形破坏特征的研究[D]. 青岛:山东科技大学,2005. [10] 张蕊,姜振泉,岳尊彩,等. 采动条件下厚煤层底板破坏规律动态监测及数值模拟研究[J]. 采矿与安全工程学报,2012,29(5):625-630. [11] 陆银龙,王连国. 含断层煤层底板损伤破坏演化数值模拟及微震监测研究[J]. 采矿与安全工程学报,2013,30(1):38-44. [12] 张金才,刘天泉.论煤层底板采动裂隙带的深度及分布特征[J].煤炭学报,1990,15(2):46-54.
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