Abstract: The point load strength, uniaxial compressive strength and rebound strength of representative rocks in Dayangshan tunnel project were tested, and the correlation among them was fitted by power function, exponential function and linear function. The results show that it’s better to use power function to fit the relationship between point load strength and uniaxial compressive strength, and exponential function to fit the relationship between rebound strength and uniaxial compressive strength, point load strength and rebound strength. In order to reduce the number of laboratory tests, we use these related formulas to predict the uniaxial compressive strength of rock. Moreover, uniaxial compressive strength has influence on the fitting accuracy, which should be considered in the prediction.

Key words: uniaxial compressive strength, point load strength, rebound strength, correlation