Measurement and analysis of geostatic stress by using radial deformation of borehole and wall stress of hole

it must be related with stress distribution near borehole in rockmass. For stress distribution near borehole in orthotropic rock matrix

it is difficult to obtain the analytic expression of stress through the method of solving partial differential equation; and it directly influences the accuracy of results of geostatic stress. Through constructing stress function

the stress near the borehole is solved with stress calculus of variations. That supplies theoretical foundation for accurate analysis of geostatic stress in orthotropic rockmass.