充填墙提升煤柱性能机理与数值模拟研究
发布时间：2018-08-16 12:00
【摘要】：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%。
[Abstract]:Based on the analysis of the failure and instability process and law of strip coal pillar, the mechanism of reinforcing coal pillar with filling wall to improve its performance is studied, and the performance of low strength paste and high strength gangue concrete filling wall lifting coal pillar is simulated and analyzed. The results show that the reinforcement effect of filling wall is mainly reflected in the lateral constraint of coal pillar and the sharing of bearing load on coal pillar, and the strength of filling wall and the lateral constraint on pillar must meet certain conditions to ensure the effect of pillar performance enhancement. The filling wall mainly limits the transverse deformation of the coal body in the plastic failure zone of coal pillar and makes its bearing capacity increase and the width decrease, the filling wall shares the bearing load of the coal pillar, and the overall supporting pressure of the pillar decreases. The performance effect of high strength gangue concrete filling wall is better than that of low strength paste filling wall. Under the same width, it can share more bearing load of coal pillar, limit the transverse deformation of coal pillar more effectively and provide enough lateral binding force. Under the condition of simulated geological mining, when the width of the filling wall of gangue concrete is 3 m, the performance of coal pillar is improved significantly, and the cost is not increased too much. The overall stress distribution of coal pillar tends to be smooth and uniform. The transverse deformation of 3 m wide gangue concrete filling wall is equivalent to 7.93 m wide coal pillar, the coal pillar size can be reduced 15.86 m, and the coal recovery rate can be increased by 17.62 m.
【作者单位】： 山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地;黑龙江科技大学矿业工程学院;澳大利亚联邦科学院能源部;
【基金】：国家自然科学基金项目(51474134) 教育部新世纪优秀人才支持计划项目(NCET-13-0880) 山东省自然科学杰出青年基金项目(2016JQ015)
【分类号】：TD823.6
，
本文编号：2185919
[Abstract]:Based on the analysis of the failure and instability process and law of strip coal pillar, the mechanism of reinforcing coal pillar with filling wall to improve its performance is studied, and the performance of low strength paste and high strength gangue concrete filling wall lifting coal pillar is simulated and analyzed. The results show that the reinforcement effect of filling wall is mainly reflected in the lateral constraint of coal pillar and the sharing of bearing load on coal pillar, and the strength of filling wall and the lateral constraint on pillar must meet certain conditions to ensure the effect of pillar performance enhancement. The filling wall mainly limits the transverse deformation of the coal body in the plastic failure zone of coal pillar and makes its bearing capacity increase and the width decrease, the filling wall shares the bearing load of the coal pillar, and the overall supporting pressure of the pillar decreases. The performance effect of high strength gangue concrete filling wall is better than that of low strength paste filling wall. Under the same width, it can share more bearing load of coal pillar, limit the transverse deformation of coal pillar more effectively and provide enough lateral binding force. Under the condition of simulated geological mining, when the width of the filling wall of gangue concrete is 3 m, the performance of coal pillar is improved significantly, and the cost is not increased too much. The overall stress distribution of coal pillar tends to be smooth and uniform. The transverse deformation of 3 m wide gangue concrete filling wall is equivalent to 7.93 m wide coal pillar, the coal pillar size can be reduced 15.86 m, and the coal recovery rate can be increased by 17.62 m.
【作者单位】： 山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地;黑龙江科技大学矿业工程学院;澳大利亚联邦科学院能源部;
【基金】：国家自然科学基金项目(51474134) 教育部新世纪优秀人才支持计划项目(NCET-13-0880) 山东省自然科学杰出青年基金项目(2016JQ015)
【分类号】：TD823.6
，
本文编号：2185919
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