When the JRC is constant, but the rock size increases, the shear strength of the structural plane shows a decreasing trend.
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Effect of joint roughness coefficient and size on shear and characteristic strengths of structural planes.
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The sentences
When the model sizes were 400, 600, 800, 1000, and 1200 mm, the shear strength of the structural surfaces showed an increasing trend as the JRC increased because the greater the JRC, the higher the undulation.