Abstract:Abstract: The rationality is yet unified conclusion by using the deformation of the center or the boundary points to calculate the rock deformation parameters. According to the modulus of elasticity analytical solution of rigid circular and flexible square bearing plates at center and boundary points

this paper demonstrated the difference of deformation parameters at different parts of bearing plate; by using three-dimensional finite element simulation

this paper studied rock deformation and deformation parameters of bearing plate in stiffness condition

and comparative analyzed the difference and laws of deformation modulus and real parameters of deformation calculations of center and boundary points. Studies show that: the calculated rock deformation modulus decrease with bearing plate stiffness increasing

and more and more close to the real deformation modulus of rock mass; the surface displacement of rock mass boundary is 35% less than average surface displacement of rigid circular bearing plate; the surface displacement of corner points is 42% less than average surface displacement; finally

based on the results of this study

the field test results of bearing plate in tunnel area of Jinping Hydropower Station are fixed to improve the rationality of test parameters.