An enhanced index for evaluating natural joint roughness considering multiple morphological factors affecting the shear behavior

摘要: Accurate description of joint morphology is a key issue for understanding natural joint’s shear behavior and estimating its strength. Five sets specimens with different morphological characteristics are shearing tested under normal loads. These test results reveal that three factors, i.e., inclination angle, asperity height, the back slope along direction, significantly affect behavior. Considering affecting mechanism these factors on behavior, new index, named roughness coefficient (SRC), proposed to accurately estimate strength rock joints. With help this classical JRC-JCS model can be extended from 2D 3D surface joint, which improve estimation accuracy reflect direction effect