Abstract: A tester assembled by multiple sets of mechanisms for shear strength-scale effect of a rock joint includes a horizontal loading mechanism, a horizontal supporting and force-measuring mechanism and a sample installation and lifting table are mounted on a platform on the bottom of a frame, the horizontal loading mechanism and the horizontal supporting and force-measuring mechanism are respectively located on two sides of the sample installation and lifting table; rock joint sample is divided into an upper portion and a lower portion by a slit, the horizontal loading mechanism is configured to load the upper portion of the multi-scale rock joint sample, and the horizontal supporting and force-measuring mechanism is configured to support the lower portion of the multi-scale rock joint sample; a vertical loading mechanism is located above the multi-scale rock joint sample, and can be mounted on the frame in a manner of being movable up and down; and the horizontal loading mechanism comprises at least two tangentia

Abstract: A tester assembled by multiple sets of mechanisms for shear strength-scale effect of a rock joint includes a horizontal loading mechanism, a horizontal supporting and force-measuring mechanism and a sample installation and lifting table are mounted on a platform on the bottom of a frame, the horizontal loading mechanism and the horizontal supporting and force-measuring mechanism are respectively located on two sides of the sample installation and lifting table; rock joint sample is divided into an upper portion and a lower portion by a slit, the horizontal loading mechanism is configured to load the upper portion of the multi-scale rock joint sample, and the horizontal supporting and force-measuring mechanism is configured to support the lower portion of the multi-scale rock joint sample; a vertical loading mechanism is located above the multi-scale rock joint sample, and can be mounted on the frame in a manner of being movable up and down; and the horizontal loading mechanism comprises at least two tangentia

Abstract: A method for quantitatively evaluating the anisotropy of joint roughness coefficient of rock joints is provided, comprising the following steps: selecting a joint sample of an engineering rock mass to be analyzed; uniformly arranging rock joint measurement segments in different orientations; recording each joint profile by a profilograph; measuring joint roughness coefficient of each measurement segment; calculating a statistical mean value of the joint roughness coefficients in each orientation under same dimensional conditions, and obtaining a roughness coefficient class ratio in each orientation; transforming each item in the roughness coefficient class ratio by R1(i)=r0(i)1/m; fitting the processed roughness coefficient of the rock joints by anisotropic ellipse function; determining a major axis a and a minor axis b of the anisotropic ellipse, ? representing a direction of rotation, where a ratio of the major axis to the minor axis indicates a difference between the maximum roughness coefficient and the m