冲击矿压预测的电磁辐射技术及应用
首发时间:2003-10-26
摘要:岩石冲击破裂过程中,裂缝的形成和颗粒的摩擦会产生电磁辐射。煤岩体的电磁辐射是由于非均质煤岩体在应力作用下非均匀变速变形及裂纹形成与扩展过程中,内部电荷的迁移而产生。实验室研究了强冲击煤样破坏前后的电磁辐射规律,得到煤体应力越大,变形破裂越强烈,电磁辐射信号也越强;确定了煤样冲击破坏的电磁辐射预警值;提出了临界指标法、偏差法等监测冲击矿压危险的电磁辐射方法。采用电磁辐射监测仪对某矿具有严重冲击危险的四层煤工作面进行了矿震和冲击矿压危险监测,有效地预测出了多次冲击危险,取得了良好的效果。
关键词: 电磁辐射 冲击矿压;临界指标法;偏差法;危险监测
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Electromagnetic Emission Technique of Monitoring Rock Burst and Its Application
Abstract:he Electromagnetic Emission (EME) is caused by the crack expands and friction of granule during rock and coal burst failure. EME occurred when it is caused by the loaded inhomogeneous coal and rock inhomogeneous variable speed and the deformation of various parts of the coal and the variable speeding movement of electrical particles during crack expansion. In the laboratory the coal sample which has high danger of burst is take into experiment. The EME rules before and after its burst failure is obtained. The higher the stress in the coal is, the stronger the deformation and the failure are, and the stronger the signal of the EME is. The EME warning value of coal failure is defined. Some methods to monitor and forecast the rock burst have been held, such as critical point, deviation values. KBD5 apparatus has been used to monitor the seismicity and rock burst of 4# coal seam’s working face which has high danger of rock burst in coal mine. Many times of rock burst danger were forecaste
Keywords: Electromagnetic Emission (EME) Rock Burst Critical Point Deviation Values Monitoring Danger
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No.10611067178870****
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