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Study on overburden failure characteristics in deep thick loose seam and thick coal seam mining
Geomatics, Natural Hazards and Risk ( IF 4.2 ) Pub Date : 2020-01-01 , DOI: 10.1080/19475705.2020.1737584
Weitao Liu 1, 2 , Lifu Pang 1, 2 , Baichao Xu 1, 2 , Xi Sun 1, 2
Affiliation  

Abstract In order to solve the related problems of roof collapse in deep thick loose seam, taking the actual geological conditions of 1302 working face of Zhaolou Coal Mine as the geological background. A mechanical calculation and analysis model for a deep thick loose seam is established. A mining dynamic simulation was carried out using the numerical simulation software FLAC3D. Fracture development height was observed using a multi-stage plugging and leak detection system. Sublevel solid compaction filling technology was used to fill the goaf. Research shows that the caving zone, fissure development zone, and bending subsidence zone are formed during thick loose seam mining. The caving zone area is larger when the ground stress on the roof is larger, and fracture zones are better developed because the density of the loose seam area is smaller. Numerical simulation results are slightly larger than the measured results, so the roof overburden activity can be effectively predicted using the numerical simulation. The problem of serious roof collapse and surface subsidence in goafs can be effectively controlled using sectional compact filling technology.

中文翻译:

深厚松散煤层和厚煤层开采覆岩破坏特征研究

摘要 为了解决深厚松散煤层顶板倒塌的相关问题,以赵楼煤矿1302工作面的实际地质条件为地质背景。建立了深厚松散煤层力学计算分析模型。使用数值模拟软件FLAC3D进行采矿动态模拟。使用多级封堵和泄漏检测系统观察裂缝发展高度。采空区采用分段固体压实充填技术。研究表明,在厚松散煤层开采过程中形成了崩落带、裂隙发育带和弯曲沉降带。顶板地应力越大,崩落带面积越大,松散煤层密度越小,断裂带越发育。数值模拟结果略大于实测结果,因此利用数值模拟可以有效地预测顶盖上覆活动。采用分段压实充填技术可以有效控制采空区顶板严重塌陷和地表下沉问题。
更新日期:2020-01-01
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