Rock mechanical characteristic prediction method based on fractal characteristics of fracture surface of hot dry rock

The invention relates to the technical field of geothermal energy exploration and development, and discloses a hot dry rock fracture surface fractal feature-based rock mechanics feature prediction method, which comprises the following steps of: establishing a model relationship among cohesion, an internal friction angle and fractal dimensions, embedding a Mohr-Coulomb strength failure criterion model and a weak surface stability judgment criterion model into the model relationship, and establishing a fractal feature model; an evaluation model used for judging the damage characteristics and weak plane stability of the hot dry rock is obtained; and establishing a model relationship among the Young's modulus, Poisson's ratio and fractal dimension of the rock, and embedding the fracture mechanical stress concentration factor into the model relationship to obtain a rock fracture stress concentration factor model for evaluating the transformation condition of the hot dry rock reservoir. According to the method, fra