STUDY ON NONLINEAR CREEP MODEL OF MARBLE

In order to realize the creep properties of marble, the uniaxial creep experiment under a series of different loading time was carried out to the marble from heaven mountain in Chang'an County of Xi'an city by using RLW-1000G rock triaxial rheological meter, and the curve of creep test was identified by applying improved Nishihara model. The experiment shows that the instantaneous deformation, constant creep and accelerating creep in the axial deformation process of marble are more obvious, but the decelerating creep process is very short. As the time increasing, damage effect of marble increases under same load, which leads the strain increment enlarges. Marble composite rheological model is obtained by using the nonlinear viscous component to improve the the Nishihara model, which has gained good result, and possesses a certain guiding significance to realize the marble creep characteristics and construction of rock engineering.