Migration law for random parameters rockfall in steeply dipping coal seams

The migration process of rockfall has certain complexity and randomness in steeply dipping coal seams (SDCS). three-dimensional random with parameters cannot be accurately simulated. Taking the transport arbitrarily shaped formed by roof leakage steep seam working face as research object, a method for generating shape irregular polyhedrons based on ellipsoid equation is provided. And geographic information system data, such contour line bottom floor face, 3D grid model established. mining space was simulated using Monte Carlo simulation technology combined energy tracking (ETM) to compile program, considering collision recovery coefficient friction between floor. influence velocity, angular velocity analyzed. With increase variation parameters, characteristics becomes greater. impact much more significant than that coefficient. offset ratio increases presented this paper can used simulate motion accurately, theoretical basis provided predicting protecting hazards.