Experimental study on resistivity response characteristics of loaded coal during nitrogen injection

In order to explore the evolution of coal cracks during nitrogen injection, resistivity response tests injection were carried out. The research shows that process, remains basically unchanged at first, then increases slowly, and suddenly stabilizes about 1.2 finally. adsorption leads a decrease in resistivity, higher pressure is, greater will be. development fissures affect conduction channel, resulting an increase resistivity. process change loaded is result combined effect expansion coal.