基于FLAC2D模拟的矿山巷道掘进煤岩变形破裂力电耦合规律研究

通过FLAC^2D模拟了矿山巷道掘进过程中煤岩内部应力场的分布规律；根据提取的模拟计算应力值和煤岩受压变形破裂过程中产生的电磁辐射强度与煤岩内部应力之间的力电耦合关系式，对巷道掘进过程中产生的电磁辐射信号变化规律进行了研究。研究结果表明：电磁辐射模拟计算值在巷道中间高度的电磁辐射信号是最强的；在不同的加载应力下，监测点接收的电磁辐射模拟计算值也有较大的差别，加载应力越大，产生的电磁辐射信号越强；监测点接收的电磁辐射模拟计算值随着频率的增加而呈幂率关系下降；将应力集中区域看作电磁辐射源区是可行的。研究成果为煤岩灾害动力现象电磁辐射监测技术的研究提供了一种新的研究思路和方法。

RESEARCH ON COUPLING LAWS BETWEEN EME AND STRESS FIELDS DURING DEFORMATION AND FRACTURE OF MINE TUNNEL EXCAVATION BASED ON FLAC2D

The distribution laws of stress fields in the course of mine tunnel excavation are simulated by means of FLAC2D software. According to the stress values and the coupling laws between electromagnetic emission(EME) and stress fields during the deformation and fracture of coal or rock,the changing laws of EME during mine tunnel excavation are also researched. The researching results show that the electromagnetic emission signals have the biggest value in the middle of tunnel. The monitored EME values are very varied under different loading stresses. The higher the loading stress is,the stronger the EME signal produced is. The EME values received in the detecting place will decrease in line with power rate relation with the increasing of EME frequency. And it is feasible to regard the stress concentrating area as EME resources. The EME in the same monitoring place increases firstly,and then increases slightly with the increase of time. The changing of EME strength reflects the changing of inner stress after excavation. The experimental results of EME have the same changing tendency as the simulated results,which also testify the feasibility of the coupling method between EME and stress. Thus it is offered a kind of new research approach to electromagnetic emission monitoring technology for the purpose of the application of monitoring EME in the prediction of catastrophe dynamic phenomena such as coal or rock outbursts.