Study on Dynamic Characteristics and Electromagnetic Signal Variation Characteristics of Coal Under Impact Loading
ZHANG Yuxu
WANG Ke
Abstract：In order to reveal the dynamic properties and electromagnetic signal variation characteristics of outburst coal seam, the dynamic mechanical properties of coal samples under impact loading were studied by using SHPB bar technology with a cross section of 50 mm. The results show that with the increase of strain rate, the dynamic response of coal materials transits from hardening to softening, and the coal samples are destroyed. The electromagnetic signal released during the process lasts less than 1 second and its frequency ranges from 0 Hz to 40 Hz. The electromagnetic signal shows the characteristics of straight-line rise, exponential decline and small oscillation at the end, and increases with the increase of impact velocity, average strain rate and maximum strain rate, while decreases with the increase of failure strain.
Keywords：outburst coal seamimpact loadelectromagnetic signaldynamic mechanical propertiesSHPB rod technology
Publication Date：2019-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 46-49 )