Abstract: The bearing capacity of rock mass is generally estimated from the uniaxial compressive strength test results of the intact rock core. However, in the practical engineering, the soft rock, the lamellar weathered rock, and the broken rock and other reasons such as sampling difficulties, weathering, disintegration and sample preparation disturbance, result in no intact rock core or no representative intact rock core for the uniaxial compressive strength tests. In this paper, the potential difficulties, and risks of estimating the bearing capacity of the rock mass in the broken rock site are analyzed. At the same time, the problems of the uniaxial compressive strength of the intact rock provided by the testing unit during the excavation stage are provided. Based on the analysis of the relationship between foundation loading, uniaxial compressive strength test results. plate loading test results, it is proposed that the bearing capacity of the rock mass for the soft rock, the lamellar weathered rock and the broken rock sites must be comprehensively evaluation based on test data and geological environment, and the suggestions of the range of bearing capacity of the rock mass are provided.

Key words: Soft rock； Lamellar Weathered Rock； Broken Rock, Uniaxial Compressive Strength, Comprehensive Assessment； Bearing Capacity of Foundations