Numerical Simulation on Failure Rules of Overburden Strata in Shallow Coal Seam

Abstract

The mining, under the condition of the shallow coal seam, the thick loose beds and the thin base rock in Shendong mining area in Shaanxi province of China, makes the surface subsidence take on the situation of the discontinuous falling crack failure. A great deal of analysis and research indicates that the crack damage is controlled by the key strata in the overburden strata. Therefore, the key for solving the control of mining damage under this condition is to research the rules of the key stratum failure in the shallow seam. Taking 1203 longwall face in Daliuta mine of Shendong mining area as the example, the paper studies the relationship between the stability condition of the key stratum structure and the mining damage, supplying the theoretic evidence for the environmental protection and the confirmation of the reasonable and economical controlled mining methods in Shendong mining area.