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在对条带煤柱破坏失稳过程和规律分析的基础上,研究了充填墙加固煤柱以提升其性能机理,对低强度膏体和高强度矸石混凝土充填墙提升煤柱性能进行了模拟及分析。结果表明:充填墙加固作用主要体现在对煤柱侧向约束和分担煤柱承载载荷上,充填墙自身强度和对煤柱的侧向约束须满足一定条件才能保证煤柱性能提升效果;充填墙主要限制了煤柱塑性破坏区煤体横向变形并使其承载能力增加而宽度减小;充填墙分担煤柱承载载荷,煤柱整体支承压力都有所降低;高强度矸石混凝土充填墙提升煤柱性能效果优于低强度膏体充填墙,相同宽度下可以分担更多煤柱承载载荷、更有效地限制煤柱横向变形并提供足够的侧向约束力;在模拟地质采矿条件下当矸石混凝土充填墙宽度3 m时为最佳,煤柱性能得到显著提升,又不至过大增加成本,煤柱整体应力分布趋于平缓、均匀,横向变形较小,3 m宽矸石混凝土充填墙可等效7.93 m宽煤柱,煤柱尺寸可减小15.86 m,煤炭采出率可提高17.62%。
Based on the analysis of the destabilization process and regularity of strip coal pillar failure, the mechanism of filling pillars to enhance the performance of the coal pillar is studied. The performance of pillared column with low strength paste and high strength waste rockfill concrete wall is simulated. analysis. The results show that the reinforcing effect of filling wall mainly manifests in that lateral restraint of coal pillar and load sharing of coal pillar, self-strength of filling wall and lateral restraint on coal pillar must satisfy certain conditions to ensure coal pillar performance improvement. Mainly limiting the lateral deformation of coal mass in the plastic failure zone of coal pillar and increasing the carrying capacity of the coal pillar and decreasing the width of the coal mass; filling walls share the load bearing capacity of the coal pillar and the overall support pressure of the coal pillar is reduced; and the high-strength waste rock concrete filling wall enhances the coal pillar The performance effect is better than that of the low-strength paste-filled wall, which can share more load of coal pillar under the same width, limit the lateral deformation of coal pillar more effectively and provide enough lateral restraint force. When the simulated waste rockfill concrete fill The wall width of 3 m is the best, coal column performance has been significantly improved, not too large increase costs, the overall stress distribution of coal pillar tends to be flat, uniform, horizontal deformation is small, 3 m wide waste rockfill concrete wall can be equivalent 7.93 m wide coal pillar, pillar size can be reduced by 15.86 m, the coal recovery rate can be increased by 17.62%.