Prediction Of Mining Subsidence Under Thick Alluvial

Thick alluvial is widely distributed in China, The thickness of the alluvial layer is an average of a few hundred meters in Huainan region. Mining subsidence law in this area and some similar place differs significantly from the general geological conditions. Because the changing of geological conditions, mining subsidence prediction which as one of the core mining subsidence will also change.Through detailed analysis of geological and hydrogeological data in Gubei coalmine, combined with 13121 coal mining face in Gubei coalmine as an example, dissertated the movement law of surface deformation and the mechanism under thick alluvium; analysis the main factors of mining subsidence under thick alluvial and take unique factors into qualitative analysis, research how these unique factors affecting mining subsidence on ground movement under thick alluvial conditions; quantitative prediction of mining subsidence under thick alluvium is one of the core tasks of mining subsidence, in this paper, a large number of actual drilling data will be used to divide the basis of the overlying rock layers into rock and thick alluvium, calculate the sinking of these two media under mining conditions, based on these, this paper also take the change of unconsolidated confined aquifer water level into consideration in Huainan area, calculate the sinking caused by the change of unconsolidated confined aquifer water level, finally get the dual media coupled model which consider the change of aquifer water level, the model not only improved the prediction accuracy, and can be explained by the characteristics of ground movement and deformation mechanism under thick alluvium.