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。
h used the discrete element software to analyze mining rock stress and fissure which could simulate the changes response of eontinuous and discontinuous medium. The results showed that the mining stress change was related to the distance between mining face and the spacing of coal- roek 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 fre- quency of h）ading 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.
出处
《煤矿安全》
CAS
北大核心
2013年第10期30-33,共4页
Safety in Coal Mines
关键词
采动应力
采动裂隙
离散元模拟软件
裂隙分布
瓦斯抽放布置
mining stress
mining fissure
discrete element simulation software
fl＇acture distribution
gas drainage arrangement
