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Acoustic Emission Warning Signals Change Law Research during Deformation and Failure of Gassy Coal Rock
Authors
吕祥锋
徐军
+4 more
朱洪伟
潘一山
罗浩
肖晓春
Publication date
15 June 2013
Publisher
Abstract
为提高矿井瓦斯突出灾害预测准确率,基于力学、声学理论,采用实验室试验方法,以标准煤试样为研究对象,对含瓦斯煤岩变形破裂过程声发射(AE)预警声信号变化规律进行研究。试验结果表明:围岩应力增大,煤岩破裂由低围岩应力的脆性破坏逐渐过渡到高围岩应力状态的塑性破坏,可根据声发射高幅信号提前预测煤岩破裂时刻。瓦斯的力学和非力学作用对煤岩体力学性质和变形特性的影响均随瓦斯压力的增加而变大。瓦斯压力越大,则煤岩破裂进程加快,积累的声发射能量迅速释放,高值振铃计数声发射信号覆盖时间区段变长,声发射信号能及时反映含瓦斯煤岩的不稳定性
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Institute Of Mechanics,Chinese Academy of Sciences
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Last time updated on 12/02/2018