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为获得煤矿巷道内某点煤岩体的稳定性信息,在不同应力水平下,对煤岩和煤进行单轴加压破坏全过程的声发射(AE)试验,将收集的煤岩AE信号在时间分布上进行分形特征研究。在此基础上,提出“分形同测”思想,即煤矿巷道内某点可能为煤岩和煤的混合体,两者的AE信号频率不同,同时采集两者的AE事件数,利用分形理论来预测其稳定性。结果表明:关联分维值D的变化能很好地反映煤岩内部微破裂的发展及演化情况。
In order to obtain the stability information of a certain coal and rock mass in the coal mine roadway, the AE test of coal and rock under uniaxial pressure failure under different stress levels was carried out. The collected AE signal of coal and rock Time distribution of fractal features. On this basis, we put forward the idea of “fractal with the same test ”, that is, a certain point in the coal mine roadway may be a mixture of coal and rock, the AE signal frequency of the two is different, Fractal theory to predict its stability. The results show that the change of fractal dimension D can well reflect the development and evolution of micro-cracks in coal rock.