沟域下煤柱破坏规律及合理宽度煤柱断裂的分形特征与其稳定性的联系

Zhaopeng Wu, Yunpei Liang, Kaijun Miao, Qigang Li, Sichen Liu, Qican Ran, Wanjie Sun, Hualong Yin, Yun Ma
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引用次数: 0

摘要

煤柱是控制巷道围岩稳定性、维护井下采矿活动安全的重要结构。煤柱尺寸设计不合理,会导致围岩结构破坏或煤炭资源浪费。我国陕北矿区属于冲沟区浅埋煤层开采,冲沟地形使得煤柱的承载规律和内部裂隙的发育规律较为复杂。本研究以龙华煤矿20202工作面地质条件为基础,建立了PFC2D数值模型,研究了平缓地形区不同上覆地层基荷比和冲沟地形区不同冲沟坡度断面下煤柱的破坏特征,提出了基于断裂分形特征的煤柱设计策略,为类似地质条件下矿井煤柱宽度的确定提供了参考。结果表明,上覆地层基载荷比与煤柱断裂分形维数之间数学方程的可靠性较高,上覆地层基载荷比越小,煤柱破坏程度越大,实际上覆地层基载荷比(1.19)条件下煤柱宽度为15 m较为合理。与平缓地形区相比,沟谷地形区煤柱破坏程度较大,其中位于沟底以下的煤柱断裂分形维数最小,沟谷地形区煤柱应尽量设置在沟底以下,使煤柱位于沟底以下,以保证煤柱的稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Damage Law and Reasonable Width of Coal Pillar under Gully Area: Linking Fractal Characteristics of Coal Pillar Fractures to Their Stability
The coal pillar is an important structure to control the stability of the roadway surrounding rock and maintain the safety of underground mining activities. An unreasonable design of the coal pillar size can result in the failure of the surrounding rock structure or waste of coal resources. The northern Shaanxi mining area of China belongs to the shallow buried coal seam mining in the gully area, and the gully topography makes the bearing law of the coal pillar and the development law of the internal fracture more complicated. In this study, based on the geological conditions of the Longhua Mine 20202 working face, a PFC2D numerical model was established to study the damage characteristics of coal pillars under the different overlying strata base load ratios in the gentle terrain area and the different gully slope sections in the gully terrain area, and the coal pillar design strategy based on the fractal characteristics of the fractures was proposed to provide a reference for determining the width of the coal pillars in mines under similar geological conditions. The results show that the reliability of the mathematical equation between the overlying strata base load ratio and the fractal dimension of the fractures in the coal pillar is high, the smaller the overlying strata base load ratio is, the greater the damage degree of the coal pillar is, and the width of the coal pillar of 15 m under the condition of the actual overlying strata base load ratio (1.19) is more reasonable. Compared with the gentle terrain area, the damage degree of the coal pillar in the gully terrain area is larger, in which the fractal dimension of the fracture in the coal pillar located below the gully bottom is the smallest, and the coal pillar in the gully terrain should be set as far as possible to make the coal pillar located below the gully bottom, so as to ensure the stability of the coal pillar.
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