The Research On Stability Of Draft Power Plant Building Foundation With The Goaf Of Pangzhuang Coal Mine In Xuzhou City

In the past decades, Mineral resources had been mined with extraordinary and extensive way. Large area and largescale goafs had been formed at the Major mining areas in central and western of our country. At the same time, because of the rising of national infrastructure, Many basic buildings, such as highway, railway, industrial and civil construction, have to Through or based on the goaf. So, there is a contradiction between the requirements of the building site based on the goafs and the activated deformation occur on the surface of the goaf. So, it is very important to pay attention to study on the stability of the building foundation with goaf, which has greatly importance realism sense to important infrastucture and utilize land of mined zone and programming of mining town.In this paper, The industry square site of Pangzhuang coal mine is studied. By analyzing its coal-bearing stratum, geological structure, mining and the distribution of goaf, motion and demolish regulars of overlying strata and the characteristics of "Three Zones" is established, the residual deflection of industry square surface is forecasted with probability-integral method. At the same time, considering the result of FLAC3D numerical simulation, the motion and demolish regulars of surface is researched by the influenced of repeat mining. On the basis of the state field, the FLAC3D is used to open out the changing characteristics of stress field, and to get the residual deformation dates of gradient, horizontal displacement and curvature,by means of which the stability of the building foundation on the goaf is analysed partition. And there are some suggestions about control measures should be taken. In this paper, the stresses redistribution, surface movement and deformation characteristics of the overburden rocks in the mined-out area were analysis deeply, and the stability of the building foundation on the goaf is evaluated by probability-integral method and numerical simulation method. the conclusions have gived the security for the design and construction of the power plant, some practical meaning for the coal mining. And we also provide some help to next study and engineering pratice.