Understanding the Mechanism of Strong Mining Tremors near the Goaf Area of Longwall Mining: A Case Study

Strong mining tremors (SMTs) frequently occur in super-thick strata near the goaf when mining. Since 2021, there have been three consecutive SMTs with magnitude greater than 2.0 longwall 1208 of Shilawusu Coal Mine. These caused mine production to be suspended for more 290 days and affected over 100 households located on shaking ground, seriously threatened safety underground workers restricted capacity. Therefore, it is essential investigate occurrence mechanism order understand phenomenon, how disaster occurs, prevention control tremor disasters. In this study, field observation, numerical analysis, theoretical calculation were used study The results show that fracture induced by generally higher one orders some source mechanical parameters compared other tremors, so likely cause ground shaking. Field observations revealed before after SMTs, maximum surface subsidence suddenly increased about 0.1 m showed a “stepped” increase, began experience fractures. following mechanics model was established: at stage mining, increase area hanging roof, will initial periodic fractures, which can easily induce SMTs. relative moment tensor inversion method calculate found tensile rupture resulting from ruptures strata, addition shear generated adjustment unstable structures. As continues face, still possibility SMT occurrence. This paper provides insights into coal mines.