Mechanical analysis and simulation of in-situ deformation test of columnar jointed rock mass

The value of joint stiffness based on in-situ deformation experimental results of columnar jointed rock mass in Baihetan dam region was discussed.The value of columnar joint stiffness is obtained by using experimental data of flexible central hole deformation test.The regulation and deformation properties of rock single concept model are analyzed.Rock deformation is made up of two parts,one of rock and one of rock joint,and its hysteretic properties are determined by joints' mechanical behavior.Moreover,the formula of deformation deduced can calculate the equivalent elastic modulus of multi-set intersection joint rock and describe the anisotropic characteristics of jointed rock.A random model of columnar jointed rock mass is established.The rock mass is stimulated by using discrete element method and the stiffness of reverse calculation;and equivalent deformation parameters obtained are in the range of test results.