Abstract-New techniques for evaluating the incendiary behavior of insulators is presented.The onset of incendive brush discharges in air is evaluated using standard spark probe techniques for the case simulating approaches of an electrically grounded sphere to a charged insulator in the presence of a flammable atmosphere. However, this standard technique is unsuitable for the case of brush discharges that may occur during the charging-separation process for two insulator materials. We present experimental techniques to evaluate this hazard in the presence of a flammable atmosphere which is ideally suited to measure the incendiary nature of micro-discharges upon separation, a measurement never before performed.
Facts have proved that it is of important significance to study repair and reinforcement technology for damaged soft-rock roadway in deep mine. With field survey and borehole TV detection of large soft-rock roadway in south wing of Yangcheng Coal Mine, failure characteristics of surrounding rocks in the roadway were discussed. Based on the principle of bolt-grouting support, the repair and reinforcement plan of full-face high-strength pre-stressed bolt support to reinforce surrounding rocks actively + full face grouting lines and long grouting reinforcement with anchor cable + floor overbreak and bolting-backfill for floor heaving control was proposed. Moreover, reasonable support parameters and process were designed. Numerical simulation and field application test confirmed that the proposed plan can control deformation failure of surrounding rock effectively and safeguards the long-term roadway stability. The proposed plan can be popularized to similar roadway repairs.
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