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Numerical Simulation Study on Mechanical Characteristics and Width Optimization of Narrow Coal Pillar in Gob-Side Coal Seam Tunnel

Sustainability (New Rochelle, N.Y.)(2022)

Xian Univ Sci & Technol | Xinjiang Coal Sci Res Inst | Chongqing Res Inst

Cited 2|Views15
Abstract
To investigate the influence of coal pillar width on the stress variation of narrow coal pillar (NCP) in the gob-side tunnel in an inclined thick coal seam, theoretical analysis, numerical modeling, and field monitoring are performed to determine the optimal width of the narrow coal pillars in inclined coal seams. The mechanical characteristics of the NCP for varying widths were investigated. Furthermore, vertical and horizontal stress were calculated for various widths of the NCP. The results revealed that with the rise in the width, the vertical stress initially increased dramatically and then stabilized, whereas the mean horizontal stress increased gradually. The mathematical relation between stress and NCP widths was represented by two fitting equations. The evolution process of the plastic zone in the NCP under various widths and the damage form of various widths were obtained; that is, when the width was small, the position of the roadway near the shoulder corner of NCP was inclined to the top of NCP. The field monitoring data revealed that the optimum NCP width was 4 m. This NCP width could stabilize the roadway and improve the loss prevention of the NCP at the gob-side tunnel of similar mines.
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Key words
narrow coal pillar,inclined thick coal seam,optimal width,damage form,loss prevention
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要点】:研究探讨了倾斜厚煤层中窄煤柱宽度对应力变化的影响,通过理论分析、数值模拟和现场监测确定了窄煤柱的最佳宽度,以稳定巷道并提高窄煤柱在采空区侧巷道的损失防治效果。

方法】:采用理论分析、数值模拟和现场监测相结合的方法,研究了不同宽度的窄煤柱的力学特性,并计算了不同宽度的窄煤柱的垂直和水平应力。

实验】:通过数值模拟研究了窄煤柱在不同宽度下的塑性区演化过程和损伤形式,现场监测数据表明,最佳窄煤柱宽度为4米,该宽度可以稳定巷道并提高损失防治效果。数据集名称未在文本中提及。