Numerical and Field Investigations of Tremors Induced by Thick-Hard Strata Fracture

Large energy mining-induced tremors are generally caused by the rupture of thick-hard overlying strata, and roadway is prone to rockburst danger under its dynamic load. Through numerical simulations, laws influencing factors stress, deformation, fracture (red bed breaking) were revealed, results verified field observations. The main conclusions obtained: (1) tensile stress compressive concentrated in middle rock both sides goaf, which shear failure type tremors, respectively; (2) after goaf was formed, around transformed into stress. When a strong tremor occurred, increased further. Meanwhile, when it close strength coal roadway, occurred; (3) released larger than that failure. With increase roof, also increased; (4) according frequency-spectrum located extremely strata above working face Baodian mine, load generated superimposed on high static very likely induce instability roadway. research have certain guiding significance for prevention mines with roofs.