电磁辐射技术确定保护层采空区煤柱影响带

Application of EME to Ascertain Impacting Area of Coverage's Island Abutment

保护层采空区留有煤柱会引起应力集中,留有煤柱的宽度不适将会形成应力集中带,以致发生强度较大的煤与瓦斯突出。煤体在应力集中带作用下产生屈服变形的过程中会产生电磁辐射,产生的应力越高,煤体变形破裂越剧烈,向外辐射的电磁辐射信号就越强。根据煤体变形破裂过程中产生的电磁辐射信号特征变化,确定了保护层采空区煤柱产生的应力集中带,电磁辐射测定结果与现场勘测资料计算结果相吻合。结果表明:电磁辐射信号与应力集中带应力状态分布有较好的对应关系,可以电磁辐射监测技术确定保护层采空区煤柱产生的应力集中带,是确定煤柱影响带的一种新方法。

The island abutment remains in the protective coat stress concentration, the unsuitable width of island abutment would form stress concentration belt and it occurs the coal and outburst. The coal engenders EME in the process of its deformation on the effect of stress concentration, the deformation fracture of the coal is more fierceness, the generate stress gets more strong and the EME gets more. According to the characteristic transformation of the EME in the process of its deformation, the stress concentration belt engendered by the coal wedge of the protective coat can be ascertained and the electromagnetic radiation measured result is consistence with the calculation result of the site survey materials. The result indicates there is a correspondent relation between the EME and distribution of the stress state in the stress concentration belt , it is an innovation to ascertain the solid coal smear zone with electromagnetic radiation monitor technology to get the stress concentration belt engendered by the coal wedge of the protective coat