Dynamic compressive failure of coal at different burial depths

Abstract Dynamic disasters frequently occur in deep coal mines, where coals and rocks are under high situ stresses. To reveal the failure mechanism of burying coals, specimens were made buried at a depth about 1 km. An improved Kolsky bar was applied to conduct dynamic compression experiments subjected different hydrostatic pressure i.e., 0, 5, 10, 15, 20 MPa for simulating stresses corresponding depths 200, 400, 600, 800 m. The findings demonstrate that compressive strength specified is rate-dependent. And positively correlated with burial given loading rate. Moreover, Mohr–Coulomb criterion loadings considers effect established, model describes experimental results well.