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| A strength empirical formula of irregular rock joints based on peak shear test |
| CHENG Tan1，GUO Baohua1，2，SUN Jiehao1，TIAN Shixuan1，SUN Chongxuan1，CHEN Yan1 |
| (1. School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454000，China；2. The Collaborative Innovation Center of Coal Safety Production of Henan Province，Henan Polytechnic University，Jiaozuo，Henan 454000，China) |
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Abstract In order to study the shear strength features of rock joints under constant normal stress conditions，irregular sandstone and granite joint specimens were prepared by using a splitting method. After obtaining the morphological parameters of rock joints with a three-dimensional topography scanner，the direct shear tests of rock joints under different normal stresses were carried out by using the RDS–200 rock joint shear test system. Based on the relationships between the peak dilatancy angle and the normal stress，and between the joint morphology and the joint deformation resistance，an empirical formula for the shear strength of irregular rock joints was proposed. On the whole，the peak shear strength，the peak shear displacement and the pre-peak shear stiffness increase with increasing the normal stress，while the contribution of the initial shear dilatancy angle to the peak shear strength decreases with increasing the normal stress. The initial shear dilatancy angle is characterized by the contour area ratio，a 3D morphology parameter of the joint surface. Based on the consideration of that the peak dilatancy angle is negatively correlated with the normal stress but positively correlated with the deformation resistance of the rock joint，an empirical formula for the peak shear strength of the rock joint was proposed to describe the peak shear resistance of the rock joints in two shear failure types. Compared with the existing empirical formulae of the rock joint shear strength，the new proposed empirical formula has a good prediction accuracy，which may provide a strong support for conveniently estimating the rock joint shear strength in engineering practice.
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2022, Vol. 41 
