Study on coal failure characteristics of multiple disturbance boreholes under dynamic load
OUYANG Zhenhua
LI Wenshuai
LIU Yang
LI Chunlei
SHI Qingwen
ZHANG Ningbo
Abstract：Stress disturbances during mining operations can alter the stress state of coal-rock masses,poten-tially triggering rockburst disasters.To investigate the damage evolution process and failure characteristics of borehole coal masses under multiple disturbances,large-scale cubic coal-like specimens with prefabricated boreholes are prepared for quasi-static cyclic loading-unloading and dynamic loading tests.The experimental results revealed that with increasing loading forces and cycle numbers,rapid accumulations of acoustic emission(AE)ring-down counts and dissipated energy density were observed,accompanied by intensified specimen damage and reduced peak strength.Under identical dynamic loading conditions,specimens with varying damage degrees exhibited distinct failure characteristics,indicating that the damage induced by different loading conditions plays a decisive role in the failure modes of coal masses.
Keywords：multiple disturbancesprecast boreholerock burstfailure characteristicsdamage evolution
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1-8 )