Experimental study on shear behavior of rock asymmetric convex discontinuity
Based on the topographic characteristics of wedge-shaped discontinuity,three distinct types of topographic discontinuity are fabricated to investigate the influence of maximum potential contact area ratio A0 on the shear behavior of these structures under varying normal stresses.The experimental results show that the failure mode of the discontinuity under the condition of low normal stress or large A0 is mainly climbing wear,and the shear stress-displacement curve shows a slip type.With the increase of normal stress or the decrease of A0,the failure mode gradually changes to climbing gear cutting and complete shear failure,and the shear stress-displacement curve presents peak shear type Ⅰ and peak shear type Ⅱ.The increase of normal stress limits the sustained dilatation effect,while the decrease of A0 changes the force on the facing slope and increases the effective bearing area of the convex during shearing,thus affecting the shear strength of the discontinuity.Based on the experimental results,a new discontinuity shear strength model is proposed,which can provide a reference for the calculation of the shear strength of rock asymmetrical convex discontinuity.
rockasymmetrical convexmaximum potential contact area ratiodiscontinuityfailure modeshear behavior
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