Abstract：The shear strength of the contacting surface between bedrock and anchor concrete is obtained through laboratory direct shear test and in-situ shear test at the South Suspension Bridge of Runyang Yangtze Bridge. The testing results show that there is significant cohesion on the contacting surface between full weathered rock and concrete because of the rough contacting surface. The shear strength indexes c and j are the functions of roughness of contacting surface between concrete and weak or slight weathered rocks. The available shear strength indexes c and j are suggested for the contacting surfaces between concrete and full to slight weathered rocks on the anchor base according to the testing results.
