永城矿区煤层底板裂隙突水机理研究

Coal Geology of China(2018)

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Abstract
通过系统收集矿区地质及水文地质资料,采用FLAC3D数值模拟方法,分析了矿区内主采煤层二2煤底板突水机理.研究表明,永城矿区灰岩突水特征与华北各大水矿区截然不同,绝大部分与隔水层厚度不够或断层无关,而属原生裂隙导水.其突水方式分为连接裂隙突水和递进导升突水.对连接裂隙突水进行了模拟研究,认为其突水机理为:在采空区或巷道底部竖直向上的压力和强大的灰岩水压力下,裂隙张开或扩张,从而导致灰岩突水,形成开放裂隙突水或闭合引张裂隙突水.
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Key words
coal Ⅱ2,FLAC3Dnumerical simulation,protogenetic fissure water conducting
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