Effect of Saturation-Dehydration on the Parameters of Burgers Creep Model

Abstract

In the background of an open-pit slope at warehouse gold mine, the beresitization fractured granite (SγJH) was selected to conduct rock tri-axial creep test subject to different saturation-dehydration cycles. It is found that the creep characteristics conform to Burgers model without considering the change of the creep failure stage. The creep parameters, the principal stress difference and its deviation are analyzed for saturation-dehydration cycles of N = 0, 1, 5, 10, respectively. Results show that the parameters of Burgers model are substantially influenced by the load level. G1 and G2 increase with the increase of axial loading. η1 and η2 decrease with the increase of axial loading. The relationship between the four parameters and the stress difference follows exponential trend. An exponential relation is found between the creep parameters and the principal stress difference for constant saturation-dehydration circles. The creep parameters are approximately exponential functions of the cycle number n for the same principal stress difference. Through curve fitting of the test data, the values of the parameters in Burgers model for the beresitization fractured granite (SγJH) are obtained by considering the water-rock interaction and principal stress difference.