Three-dimensional Geological Modeling Of Coal Mining Working Surface And Whole Dynamic Evolution Simulation Of Surrounding Rock Mining Destruction

The rock and soil layer has strong heterogeneity due to structure and deposition,which has important influence on deformation and strength.Many scholars consider the actual stratigraphic distribution,to carry out a 3 d geological modeling and apply to all kinds of simulation analysis,the research focused on the slope and foundation pit and tunnel engineering,in the coal seam mining under loose aquifer of 3 d geological modeling and formation heterogeneity of rock deformation and failure of control research is relatively small.To this end,the paper tuan 1010 working face mining in the 101 mining area of Suntuan coal mine as an example,based on the actual drilling data,the GOCAD software is used to establish the three-dimensional geological model of the real strata of the working face,and the interface program is prepared to convert the SGrid grid of GOCAD to the Brick grid of FLAC3 D,so as to realize the numerical meshwork of the geometric model.FLAC3 D software is used to simulate and analyze the whole process variation law of overburden caving and goaf stress recovery in the process of coal seam mining,and reveal the control mechanism of inhomogeneous strata to overburden failure.Through the full-text research,the following results have been achieved:(1)The point,line and surface modeling elements of GOCAD 3D geological modeling software and the key modeling technologies such as discrete smooth interpolation(DSI),triangulation algorithm and UVT transformation are systematically summarized.The data preparation of GOCAD 3D modeling and the specific techniques of modeling of strata surface and 3D mesh model are analyzed.(2)In order to solve the fault modeling technology,according to the fault scale and stratum influence degree,the whole method is adopted to realize the fault geological modeling.(3)The similarity between GOCAD SGrid grid and FLAC3 D hexahedron partition grid is analyzed,and the conversion interface program is developed using C++ language,which can transform the complex solid geological model into FLAC3 D model easily and quickly,and successfully applied to the 3D geological modeling of coal mining face.(4)According to the actual drilling data of the 1010 working face in the 101 mining area of Suntuan coal mine,GOCAD is used to construct the three-dimensional geological model of the working face and imported into the FLAC3 D numerical software through conversion,and the support action of caving gangue is simulated by the counterforce applied on the top and floor.The variation law of roof displacement,stress and plastic zone is simulated and analyzed in the whole process of overburden from roof caving to gangue fatigue pressure to stress recovery under mining conditions,and the influence law of non-uniformity of loose layer and overburden on plastic zone is discussed.The specific results are as follows:1)With the advance of the working face,the overburden subsidence gradually increases with the increase of the mined-out range,and the displacement reaches the maximum in the middle of the goaf.When the roof caving gangue is gradually pressed,the overburden displacement tends to be stable,which is in sharp contrast to the simulation results when the overburden displacement continues to increase without considering the gangue compaction.2)With the progress of the working face,the plastic zone of the roof continues to expand,and gradually forms the shape of the middle low and the two sides high.There will be obvious stress concentration zone behind the goaf hole cutting and in front of the work.Similarly,due to the support of gangue after roof collapse,the rear of working face is gradually compacted,the stress recovers,and the height of overburden plastic zone tends to be stable.3)According to the simulation results of real strata,the thicker the local soft strata,the faster the plastic zone develops;Local hard rock thickens and plastic zone slows down.In the case of local thickening of loose fourth aquifer overlying bedrock,the overburden plastic zone leads to the rapid passage of loose aquifer,which shows the control effect of rock-soil layer inhomogeneity on the deformation and failure of overburden and the risk of water inrush.damage.Figure [forty-seven] Table [eleven] Reference [seventy-six]...