A new approach to stone deformation: stone deformability index

摘要

In the present study the deformation behaviour of marbles (Nacre, Yatagan White, Milas White) and limestones (Bursa Beige, Burdur Beige, Orient Pink) over short time periods was investigated under two loads, 19 MPa and 75% uniaxial compressive strength (σ_(ucs)) for 7 h. During the 19 MPa tests, all specimens demonstrated a regularly non-linear elasticity in secondary stage but this regularly non-linear elasticity was not observed during the 75% σ_(UCs) tests. The non-linear elasticity decreased as a function of time and ultimately ended. In the secondary stage, the ratio of the lowest strain value, ε_l. to final strain value, ε_f, was defined as the stone deformability index (SD_i). Building stone type and strain value were observed to be two important factors in SD_i, which was found to be lower for the limestones than the marbles. The SD_i decreased with increasing stone strength. The crystalline size was also observed to be an important factor in the SD_i of marbles.