关键词: 结构面;宏细观参数;细观参数校核;离散元理论;复合岩体;

Abstract: The verification of meso-parameters is the top importance in the numerical simulation of composite rock discontinuities based on discrete elements method.And the discussion on the response relationship characteristics of macro-parameters and meso-parameters can provide an important reference for the verification of meso-parameters.In this paper, the bond removing method and the Smooth-joint model are used to establish a plane discontinuities numerical model with different joint wall strengths respectively.And the response relationship of the macro-parameters and meso-parameters of the plane joint established by the two different methods is deeply analyzed.The research shows that in the planar rock joint model based on the bond removing method, the peak strength is positively correlated with the meso granular friction coefficient value.When simulating the planar rock joint based on the smooth-joint model, the meso-basic friction coefficient sj＿fric,is positively correlated with the macroscopic basic friction angle and is approximately equal to its arc tangent value.The meso-normal stiffness sj＿kn and meso-shear stiffness sj＿ks are positively correlated with the macroscopic normal stiffness and shear stiffness of the rock joint, respectively.And a parameter calibration model is given by fitting equation and trial and error method, which provides an important reference for the fast and high-precised calibration of the meso-parameters of the rock joint.

Key words: rock joint; meso-parameters and macro-parameters; meso-parameter calibration; discrete element method; composite rock;