CAJ | 학술논문

煤矿老空区充水对后续煤矿安全生产威胁大。基于电磁场扩散理论，采用时域有限差分法，建立全空间二维地质模型，研究老空水瞬变电磁响应特征，结果表明：煤矿巷道中的激励源，不仅在巷道迎头前方岩体中激发二次感应场，而且在巷道迎头后方围岩中也激发二次感应场，极大值等值线环由激励源处分别向上、向下移动，强度逐渐减弱。矿井瞬变电磁场扩散速度受周围介质电性影响，低阻介质中扩散速度慢，高阻介质中扩散速度快，巷道迎头前方低阻体对全空间瞬变电磁场影响明显。当地质体中存在低阻体时，其附近电场等值线密集，梯度变大，扩散速度降低，涡流密度变大、衰减变慢。
매광로공구충수대후속매광안전생산위협대。기우전자장확산이론，채용시역유한차분법，건립전공간이유지질모형，연구로공수순변전자향응특정，결과표명：매광항도중적격려원，불부재항도영두전방암체중격발이차감응장，이차재항도영두후방위암중야격발이차감응장，겁대치등치선배유격려원처분별향상、향하이동，강도축점감약。광정순변전자장확산속도수주위개질전성영향，저조개질중확산속도만，고조개질중확산속도쾌，항도영두전방저조체대전공간순변전자장영향명현。당지질체중존재저조체시，기부근전장등치선밀집，제도변대，확산속도강저，와류밀도변대、쇠감변만。
The water filling into the gob is seriously imperiling the follow-up production of a mine. Based on the diffusion theory of electromagnetic field and by using the finite difference time domain method, a two-dimensional whole-space geological model was built and study was made on the transient electromagnetic response characteristics of gob water. The result showed that the incentive source in the mine roadway excited not only a secondary induction field in the rock mass in front of the roadway head, but also a secondary induction field in the surrounding rock behind the roadway head, the maximum contour loops moved upwards and then downwards from the incentive source, and their intensity gradually weakened. The diffusion velocity of the mine TEM field was affected by the electrical parameter of surrounding medium, it was slower in the low-resistance medium and faster in the high-resistance one, the low-resistance body in front of the roadway head had an obvious influence on the whole-space TEM field. When a low-resistance body existed in the geologic body, the isoclines of the electric field near it became more intensive, the gradient increased, the diffusion velocity reduced, the eddy-current density increased and the attenuation became slower.