Abstract
Determining the residual frictional properties of rock discontinuities in detail is crucial for the design of safe rock structures. In this paper, direct shear experiments were conducted on two types of artificial limestone joint samples (rough standard tensile joints and grinded planar small joints). The primary goal of this study is to compare the shear behavior of the two above-mentioned types of rock joints during the residual state of shear. The result of roughness analysis shows that during the shearing of rough joints, the increase in normal stress resulted from reduction in contact area which is caused by the mismatch between two surfaces in residual state, will lead to the stress concentration, asperity degradation and plastic deformations. Therefore, several CNL direct shear tests under different normal stresses were carried out on planar joint samples having small contact area (10 × 10 mm2) and it was found that when approximately similar normal stress acts on contact areas during residual state, the residual shear strength measured from those ground surfaces show a good accordance with the residual friction of standard rough joint samples.
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