关键词: “三下”采煤, 充填开采, 地表沉陷, 数值模拟

Abstract: In order to ensure the safe and efficient mining of the filling mining under buildings, water bodies and railways，and reduce the impact on the surface facilities and ecological environment. Taking Mahuangliang Mine as the background, based on UDEC numerical simulation and actual observation, the feasibility of strip filling mining under buildings was analysised , finally the subsidence of surface buildings was analyzed. The results shows that the "mining 8 leaving 24" strip filling mining technology can meet the safe and efficient production. Filling mining has little impact on surface buildings and industrial sites in Mahuangliang mining area, and the subsidence is about 10 cm, which is similar to the actual monitoring results and ensures the safety of mining. The results will play an important guiding role in improving the recovery rate of coal resources, extending the service life of the mine, and promoting the sustainable development of the mining area.

Key words: under buildings, water bodies and railways coal mining,filling mining,surface subsidence, numerical simulation