Rock mass poisson ratio obtaining method

The invention relates to a rock mass poisson ratio obtaining method. The method is characterized by taking the statistical rock mass mechanics theory as a research basis, based on the constitutive relation of a rock mass structural plane, the flexibility tensor of a rock block and the structural plane, and a Poisson's ratio calculation formula, obtaining a Poisson's ratio expression closer to thereal structure and the environmental state of a rock mass on the condition of comprehensively considering the rock mass geological conditions, and obtaining the structural data of the rock mass, utilizing the expression to obtain the more accurate bidirectional Poisson's ratio data of the rock mass, so that the important reference data is provided for the engineering construction, and the method has the important engineering significance. The method provided by the invention is simple to operate, is short in calculation time, overcomes the defects of cumbersome experimental equipment, high experimental cost and long e