Abstract:Hydraulic fractures produced by hydraulic fracturing techniques can enhance the permeability of low-permeability sandstone uranium reservoirs. In order to the extension pattern of hydraulic fracture in low permeability sandstone uranium ore. Modeling of hydraulic fracture extensions in sandstone formations based on the block distinct element method. Expansion patterns of hydraulic-enhanced permeability fractures were analyzed for different deformation parameters and bedding productions. The results show that the modulus of elasticity plays a dominant role in the expansion of hydraulic fractures in the height direction and penetrate the layer. As the elastic modulus increases and Poisson"s ratio decreases, the tendency of hydraulic fractures to penetrate the layer and the fracture height decreases significantly. The turning tendency of hydraulic fractures, the extension distance in the horizontal direction, and the ease of hydraulic fracture initiation increased. Hydraulic fractures are able to penetrate the layer in all the low-bedding rational dip strata. As the dip of the bedding becomes larger, the easier it is to start hydraulic fractures. The opposite is true in the upper rational dip strata. This study is a theoretical guide for the construction of hydraulic-enhanced permeability in low-permeability sandstone uranium mines.