Abstract
A uniaxial compressive strength (UCS) test was performed to clarify the effect of specimen size and rock properties on UCS of Ryukyu Limestone. Specimens were square pillars of similar shape but different size, having side d (1cm, 2.5cm, 5cm, 7.5cm, and 10cm) and height of 2d. We found that (1) the UCS has a clear scale effect, decreasing with increasing size of the specimen; (2) the UCS increases with increasing density of the specimen; and (3) the UCS increases with increasing secant Young's modulus. The UCS of Ryukyu Limestone is strongly influenced by specimen size and rock properties.
