Failure characteristics and constitutive model of rock under unloading condition
ZHANG Li-ming
WANG Zai-quan
SUN Hui
ZHANG Ying-hui
KUANG Shun-yong
Abstract：The full stress-strain curves and deformation features of rocks were obtained based on the results of triax-ial unloading tests. The results show that compared with loading condition, the axial strain harden stage is shorter for unloading, the axial peak strain is lower. Deformation modulus decrease and Poisson ratio increase in the process of unloading. Primary shear failure is the main failure modes of rocks. Based on experimental results, a three-dimensional rock damage constitutive model was established by using Weibull distribution and Mohr-Coulomb theory. The model agrees well with experimental results, which reflect the change of strength with confining pres-sure and characteristic of brittle of rock under unloading condition.
Keywords：unloadingfailure characteristicsconstitutive modellimestonedamage
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 1626-1631 )