Research on the characteristic of surface movement and its formation mechanism under thick unconsolidated layer in Kailuan mine area

In recent years, the influence of coal mining on surface ecological environment getting increasingly concerned, and the accurate prediction of coal mining subsidence under thick unconsolidated layer has become a technical problem to coal enterprises and research institutes. The surface movement parameter characteristics, such as surface subsidence factor, boundary angle, displacement angle, etc., were analysed in this paper, combining the research results of surface movement in Kailuan mine area, and the affecting factors of strata movement parameters was discussed at the same time. The strata movement mechanism of mining under unconsolidated soil layer was studied basing the groundwater dynamics and solidification theory in association with the hydrogeologic condition. The strata movement and deformation mechanism was studied due to destruction of the groundwater seepage field and consolidation of soil layer in underground coal mining. The results would be of great significance to the accurate prediction of coal mining subsidence under unconsolidated soil layer, prevention and control of mining damage, planning of coal mining.