The Study Of Motion Rule Of Overlying Rock And The Surface Caused By Underground Coal Mining

The inherent stress state of the original rock has changed since the coal is mined, then inside the rock, a cavity will form when the change reaches a certain level, with the expansion of mined-out area, the rock movement will develop until to the surface, and that will cause the ecological environment change, which will eventually damage the structures. This movement is a complex process which is affected by the geological and mining conditions, and one of the main research method is to study surface movement pattern and overlying rocks movement by actual measurement and similar material simulation methods. This research of surface movement pattern and overlying rocks movement is of actual importance to the production and development of the mine area.This article describes the basic pattern of the surface movement and the prediction theory of the deformation of mining subsidence, then introduces kinds of parameters subsidence prediction algorithms. Then it sets728working face of Qingdong mine as example, and analysis the actual measurement data of the surface subsidence measurement pots which are already setted, then uses visual programming language, Based on Genetic Algorithm, to develop the programe of striking the surface movement parameters and drawing the surface deformation contours, with wich the ground movement and deformation data visualization is achived.In addition, this article also uses the geological and mining data of728workig surface as the background, and goes on the similar materials experiment simulation study, in which we uses total station to measure the observation points; then we uses the pressure pickup to gain the changement of rock pressure and analysis the measurement results, in order to get the incidence and pressure relief angle caused from7mining coal to8mining coal. Then it analysis the movement of rocks、the damage condition of the roof and the pressure distribution pattern in the mining process.The research of this article makes some sense to the other woking face of this mine and other mine of similar geology mine condition.