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Abstract Aiming at the issue in determining the stiffness parameters of jointed rocks，numerical analysis with distinct element code (3DEC) was carried out. By means of direct shearing test of rock structure in combination with theoretical analysis，the empirical formulae representing rock stiffness parameters were obtained. Then a modified empirical formula is developed considering Bandis empirical formula with new function f(τ/τp). The results indicate that the contact parameters of normal stiffness Kn and shear stiffness Kst obtained by empirical formula through fitting could reflect the deformation behaviours of rocks before shearing failure of structural plane. Accordingly，numerical results were used to verify laboratory test results. It is thereafter believed that the shear stiffness(Kst) could be used to understand the shearing behaviours of joints before failure.
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Received: 20 May 2013
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2014, Vol. 33 
