Discrete fracture network generation method based on iterative function system

The invention discloses a discrete fracture network generation method based on an iterative function system. The method comprises the steps that a traditional discrete fracture network model is generated according to set parameters; then, randomly converting all the line segments into polylines with different directions and different shapes; converting the polyline into a fractal curve representing a crack by using an iterative function system; smoothing the fractal curve by using a curve smoothing algorithm, and exporting the processed model as a geometric file, such as a dxf format file; the intersection operation between the curves is realized through software or codes; setting an error value to detect small lines and gaps, deleting short lines, merging the small gaps into a point, and merging points close to the boundary; and finally, carrying out grid division on the model. Compared with a traditional discrete fracture network model, the fractal curve representing fractal fractures can be generated, the