厚硬顶板破断诱发矿震机制及减震技术OA

In order to investigate the factors inducing mine seismicity and reduce the frequency and degree of mine seismicity,this study focuses a coal mine in the Ordos region.By integrating field evaluation,theoretical analysis,scheme design,in-situ measurement,and industrial-scale testing,the mechanism of mining-induced seismicity triggered by thick-hard roof fracture was analyzed,and a cooperative pressure-relief and seismicity-reduction technology combining"hydraulic fracturing in roadway roof,directional long-hole hydraulic fracturing,and surface deep-hole blasting"was proposed.The research results show that the inducing factors of mining-induced seismicity in thick-hard roof working faces include mining depth,geological structures,lithological variations,advance rate,periodic weighting,etc.When multiple factors overlap,the frequency of mining-induced seismicity increases significantly.After implementing the pressure-relief technology,the average periodic weighting interval of the working face was reduced from 17.32 m to 14.81 m,a decrease of 14.49%.The monthly frequency of microseismic events increased from 185 to 1 902,with small-energy microseismic events accounting for 73.2%,exhibiting a"high-frequency,low-energy"distribution pattern.The pressure-relief and seismicity-reduction technology demonstrated excellent effectiveness,significantly lowering the risk level of mining-induced seismicity.The research conclusions provide a reference for mine earthquake control under similar conditions.