基于能量理论的煤岩体破坏电磁辐射规律研究

Study of EME rules during coal or rock mass failure base on energy theory

为了给电磁辐射预测矿井冲击地压灾害提供理论依据,采用电磁波和损伤力学理论初步分析了电磁辐射能和加载机械能的关系;采用试验和能量理论研究了单轴压缩条件下煤体变形破坏产生电磁辐射能与受载煤体能量积聚、耗散的耦合关系。研究结果表明:加载机械能与煤体变形破坏产生的电磁辐射能成系数为m正线性关系,m与煤体的弹性模量成0.107 4的比例关系;受载煤体峰值弹性应变能与电磁辐射能成正对数关系,煤体的弹性能指数与峰值累积电磁辐射能、总累积电磁辐射能均成正线性关系,电磁辐射信号反映了能量聚集和耗散的状态,表征了煤体冲击破坏的难易程度。因此,电磁辐射能够预测矿井冲击地压灾害的发生。

To provide the theorical basis for electromagnetic emission （EME） forecasting dynamic disasters of the coal or rock mass, the relations between EME energy and loading mechanical energy are analyzed preliminarily by the theory of electromagnetic wave and damage mechanics. The coupling relations between EME and energy accumulation during the deformation and failure of coal under tmiaxial compression are investigated by laboratory tests and the energy theory. The results show that： the relations between loading mechanical energy and EME energy during the deformation and failure of the coal sample is positive linearity, and the ratio is 0.1074 times with elastic modulus of coal samples; the EME energy is not only proportional to peak elastic strain energy of coal, but also proportional to the impact energy index of coal. The EME signal reflected the difficulty level of the coal dynamic damage, Therefore, the EME can forecast dynamic disasters of coal or rock mass.