Abstract: The modeling of complex structural planes in rock mass is a key technique in the numerical test of fractured rock mass. A numerical model for the structural planes in rock mass is established by means of the pre-processing of ANSYS software and the flexible interface generation of FLAC^3D software. The model is employed to numerically simulate the mechanical behaviors of layered and columnar rock masses with complex structural planes under uniaxial compression. The regularity of structural plane’s dip angle and specimen’s size respectively affecting the elastic modulus and compression strength of layered and columnar rock mass is obtained. The relations between stress and strain of different rock masses are different. The result also shows that under the same stress, the dip angle of structural plane has influence on the deformation behavior of fractured rock mass. The uniaxial compressive strength and elastic modulus of layered and columnar rock mass decrease and then gradually stabilize with the increase of specimen size.

Key words: fractured rock mass, numerical test, size effect, numerical modeling of structural plane simulation