Prediction Of Surface Subsidence For 4510 Working Face In Daihe Coal Mine

With the continuous development of coal industry in our country, problem of coal mining under buildings is increasingly serious. We need to guarantee the normal production of mine, and not affect the daily production and living of residents at the same time, which has been a problem urgently to be solved in many mines in our country. Therefore, it has a significant mining to predict building damage casued by surface subsidence.The paper takes 4510 working face as the research object, and research the law of ground deformation caused by mining by methods of mathematical statistics, similar material simulation experiment and numerical calculation. First of all, we apply the mathematical statistical method to forecast the surface deformation. Secondly, based on indoor physical simulation, we Intuitively simulate physical phenomena from the mechanism, analyze the fracture development, the overburden rock failure process caused by mining, and the impact to surface deformation, and observe the time when surface can reach steady heavy after mining. Last but not least, we simulate the experimental phenomena throughout numerical calculation, and take further steps to do simulation calculation under different mining height, analyze the impact of surface deformation caused by the difference of mining height, and get the degree of surface subsidence under different mining conditions finally.We take these three methods to do a comprehensive prediction, and they have a mutual support, which makes the result more reliable.The results showed that, the long wall caving mining method under the current mining height, namely,5 m, will contribute to serious damage of surface building, which needs a comprehensive maintenance or replacement. If we make use of filling mining method, then the mining height can reach 2.5m, and the surface building has a moderate damage, which can continue to use by an appropriate maintenance. By improving the filling rate, we can further reduce the surface deformation. The conclusion has reference significance to mine production under the same geological and mining conditions, at the same time.