WANG Zhi-yin, DUAN Pin-jia. A new method for determining mechanical parameters of joints based on triaxial compressive test for rock mass[J]. 2011, 32(11).
WANG Zhi-yin, DUAN Pin-jia. A new method for determining mechanical parameters of joints based on triaxial compressive test for rock mass[J]. 2011, 32(11).DOI:
friction angle are the important parameters in reflecting the mechanical characteristics of the joints. Based on the tri-axial compressive tests for rock mass samples containing different joint angles and analysis to stress and displacement
the analytic solutions of stiffness coefficients in the elastic state can be deduced by establishing the new equations of strain and displacement according to the reciprocal work principle; and the cohesion and the friction angle of joints are obtained by the Mohr-Coulomb strength theory. In order to verify the validity of the presented method
the direct shear tests for the rock mass samples containing the similar natural joints are implemented; and the normal stiffness
the shear stiffness
the cohesion
the friction angle of the joints are obtained. The comparative results show that the parameter values obtained by the given method are close to those by the direct shear tests. Thus
the stiffness coefficients
cohesion
friction angle of the rock joints can be got by the tri-axial compressive test
and the parameters can be concise-fleetly measured