›› 2011, Vol. 32 ›› Issue (11): 3219-3224.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

A new method for determining mechanical parameters of joints based on triaxial compressive test for rock mass

WANG Zhi-yin，DUAN Pin-jia   

  1. Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum, Beijing 102249, China
  • Received:2010-03-01 Online:2011-11-01 Published:2011-11-09

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Abstract: The stiffness coefficients, cohesion, 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

Key words: joint, stiffness coefficient, strength index, reciprocal work principle, triaxial compression test

CLC Number: 

  • TU 459
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