Study on actual measurement of surface subsidence law occurred by shallow mining depth and high intensity fully mechanized coal mining

Based on the aeolian sand cover, thick seam, shallow mining depth, large coal mining face size and other features in Ordos Area, in order to master the ground surface displacement deformation law caused by the rapid pushing forward of the fully mechanized coal mining face under the high intensity mining condition, a n observation study was conducted on the surface displacement observation station in a trial block of a coalmine, Ordos Area. A 15 months long period observation was experienced and an analysis was conducted on the measured data. The surface displacement periodical features under the condition were calculated and obtained. Ac ompleted set of the surface subsidence calculated parameters and angular parameters were ftted and obtained. The paper analyzed the estimated parameters of the s urface subsidence, angular parameters and the surface dynamic deformation features in the geological mining condition. The study results showed that under the condit ion of the high intensity mining in Ordos area, the surface displacement and deformation would have the concentrated subsidence distribution, high ground surface subs idence coefficient, surface dynamic displacement and deformation value high and serious, slow convergence of the ground surface subsidence basin boundary, a short i nitial period and active period of the surface displacement and other features.