带压煤层底板采动裂隙发育的滞后效应
Lagging Effect of Mining-induced Fractures Development in Coal Seam Floor Under Pressure
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摘要: 为了探索带压煤层开采底板裂隙的横向发育、扩展及终止规律，选择晋煤集团成庄煤矿为工程现场，通过对完整煤层与含构造煤层底板采动破坏情况的理论分析与计算，以及工程现场验证，综合研究带压煤层底板采动裂隙的横向演化规律。结果表明：基于塑性理论计算出的底板破坏区水平最大长度（30 m）同底板采动裂隙横向终止宽度的注水试验结果（28~31 m）相互接近，验证了带压煤层底板采动裂隙发育的滞后效应，也对某些老空区或隐伏构造区底板水的滞后突出现象做了说明，能有效指导安全生产。Abstract: In order to explore lateral growth, extension and termination laws of coal seam floor mining under pressure, Chengzhuang Coal Mine of Jincheng Anthracite Mining Group is selected as engineering field. Through theoretical analysis and calculation about the damage zones in different kinds of coal seam floor and field tests, a comprehensive research about transverse evolution laws of coal floor mining-induced fractures is studied. The results show that the horizontal damage length (30 m) of coal seam floor based on plastic theory and the result of water injection tests (from 28 m to 31 m) fits each other very well, which verifies the lagging effect of fractures in coal seam floor under pressure, and explains lagging outburst phenomenon of floor water in some old gobs or concealed structure areas, and effectively guides the safety production.
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