Experimental Study On Infrared Radiative Transfer Effect Of Rock Loaded Based On "P-hole" Theory

The fundamental reason for the formation of water-induced fissures in coal mining water conservation mining is caused by the internal fracture development of coal and rock.At present,the research on infrared radiation is mainly focused on the surface characteristics of coal and rock.It does not combine the internal rupture process and surface infrared radiation information.This defect restricts the application of infrared radiation monitoring technology in mining water conservation and rock formation control.In order to explore the relationship between the infrared radiation changes and the internal fracture development on the surface of coal and rock,a sandstone loading test based on the infrared radiation transfer effect of the “P-hole”theory was performed.The pressure of the sample during loading was analyzed.The relationship between the AIRT and the stress,the AIRT and stress at the non-compressed end,the AIRT and the current at the non-compressed end,and the AIRT at the compressed end and the non-compressed end AIRT lead to the following conclusions:(1)During the loading process,there is a sudden change in the current at the non-pressurized end.This phenomenon is due to the fact that the stress activates the P-hole in the dormant state and migrates to the non-pressurized end surface;in addition,part of the sample is in the loading process.In the middle,there was a clear crack between the pressure end and the non-pressure end surface,and there was still a sudden change in the current at the non-pressure end,indicating that the formation of cracks did not block the transmission of the P-hole.(2)Through COMSOL numerical simulation analysis,it is concluded that the stress generated during the loading process of the pressed end does not affect the non-pressurized end;and the platinum resistance temperature test yields the Joule heat generated by the compressed end along the transmission path of the P-hole.It is not transmitted to the non-pressurized end,that is,it does not affect the infrared radiation change of the non-pressurized end.Therefore,the change of AIRT at the non-pressure end is due to the change of P-hole.(3)During the loading process,81.8% of sandstone AIRT at the non-pressurized end exhibited phased changes.At the beginning of the elastic phase,the AIRT at the uncompressed end showed a first increase and then a decrease trend;at the middle and later stages of the elastic phase,it showed a slowly rising trend;To the final stage ofdestruction,there was a slowly rising trend.(4)At the same time when the current pulse is generated,the AIRT at the non-pressurized end is mutated,and the two have synchronicity;and whether it is a positive pulse current or a negative pulse current,the AIRT at the non-pressurized end corresponding to the moment has an increasing trend.(5)According to the data fitting analysis of AIRT data of compression end and non-pressure end,90.9% of the rock samples have good positive linear correlation in the elastic phase,and 18.2% of the rock samples have moderate positive linear correlation(0.5 <|r|<0.8),72.7% of rock samples have a strong positive linear correlation(|r|>0.8).The research results have important reference significance for the further study of the infrared radiation characteristics and internal destruction of coal and rock.