ESTIMATION OF UNIAXIAL COMPRESSIVE STRENGTH AND MODULUS OF ELASTICITY OF BEIJING MARBLES BASED ON SCHMIDT HARDNESS AND LEEB HARDNESS AND P-WAVE VELOCITY

There is a plenty of stone relics in Beijing built with Beijing marble(mainly used white marble and green marble). Due to the need of restoration and protection, it is necessary to figure out the physical and mechanical properties of these marbles. In practice, the physical parameters of stone relics can be obtained easily. But it is hard to sample stone relics for mechanical experiment. So in this study, we used Schmidt hardness, Leeb hardness, P-wave velocity, uniaxial compressive strength and modulus of elasticity to obtain the physical and mechanical properties of these marbles. In order to find out the relationship between physical parameters(including Schmidt hardness, Leeb hardness, P-wave velocity) and mechanical parameters(including uniaxial compressive strength and modulus of elasticity), the univariate and binary linear regression analysis was performed among the test results. Depending on the correlation coefficient, the results of regression analysis indicate that the Leeb hardness with D-type probe is more reliable in evaluating the uniaxial compressive strength. The results also reveal that Schmidt hardness is more suitable in predicting the modulus of elasticity. In addition, it will be more reliable to use both of the Leeb hardness with D-type probe and Schmidt hardness to evaluate uniaxial compressive strength or modulus of elasticity.