Application of gray correlation analysis in confirming the controlling factors of mining subsidence in TongChuan mining area of China

On the basis of the observed data of 16 the ground surface movement surveying stations and field observations, and some conditions on geology and mining were took into consideration fully, there were 10 controlling factors were designed. Then these 10 controlling factors were ordered on their contribution to mining subsidence by gray incidence analysis. At last the main controlling factors of mining subsidence in TongChuan mining area of China are perturbation coefficient, integrated hardness of overburden strata, thickness of surface soil, width of working face and thick of coal seam. When all the factors mentioned above are considered, the mining subsidence forecast precision will be improved effetely.