关键词: 火成岩, 观测站, 岩移规律, 数值模拟, 概率积分法

Abstract: Coal mining under thick igneous rock may cause the serious geological disaster because of the hardness of igneous rock and difficulty in caving.In order to study the surface subsidence law of coal mining under the igneous rock，and solve the problems induced by mining，such as surface damage and building protection，the surface movement observation stations were established.According to the distribution of igneous rock thickness，combining with numerical simulation，it is found that the igneous rocks with the underlying stratum subsided as a whole.Then，the mining surface subsidence with no igneous rock was gained by using the rock movement prediction software，and compared with the actual observed results to analyze the surface subsidence law during coal mining under thick igneous rock.

Key words: Igneous rock, Observation station, Regularity of rock shift, Numerical simulation, Probability integral method