采动应力-裂隙动态演化规律的数值分析
Numerical Analysis on the Mining Stress and Fissure Dynamic Evolution Rule
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摘要: 采用可以模拟连续及非连续介质出现变动响应的离散元软件对采动围岩的应力和裂隙进行了分析。结果表明：采动应力变化在时空上和采面的距离和煤岩层间距有关，完全开采前近煤层应力变化为对称“V”型-非对称“V”型-“W”型，远煤层应力变化为对称“V”型-非对称“V”型；采动裂隙是采动应力变化的显现，裂隙的发育与采动应力集载和卸载频度有关，在煤层上方15~30 m应力幅度变化大，裂隙密度大、持续时间长，是理想的瓦斯抽放位置。Abstract: It used the discrete element software to analyze mining rock stress and fissure which could simulate the changes response of continuous and discontinuous medium. The results showed that the mining stress change was related to the distance between mining face and the spacing of coal-rock seams in space; before complete mining, the stress change rule was symmetry "V" type - asymmetric "V" type - "W" type in near coal seams, and the stress change rule was symmetry "V" type - asymmetric type "V" type in far coal seams; the mining fissure showed the changes of mining stress, and the fissure development was related to the mining stress frequency of loading and unloading, the stress amplitude change was great, the fissure density was big and the last time was long for 15 to 30 m above the coal seam, which was the ideal position of gas drainage.
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