CREEP OF GRANITE UNDER VARIOUS CONFINING PRESSURES AND TEMPERATURES
Understanding the time-dependent strength degradation and associated creep behavior is essential to the safety evaluation of radioactive waste disposal systems. In this study, a series of constant loading tests under different confining pressures and temperatures have been performed to study evolution of dilatancy (damage) and strength degradation of granite with time. At the same stress ratio, increasing the confining pressure, the sample becomes more stable and the strain rate decreases. The dilatancy index D=dεpv/dεpqdecreases when the stress ratio increases, but the effect of confining pressure on the dilatancy index is not significant. The results also indicate that the strength of rock will decrease with time exponentially. For the same stress ratio, increasing confining pressure more time is required to fail the rock samples. The effect of temperatures from room temperature (23℃) to 90℃ on the creep behavior of granite is not obvious. Strength degradation with time is due to the degradation of internal material properties, which is attributed to micro-cracking or micro-fracturing.
L.G.Tham Q.X.LIN Y.M.Liu P.K.K.Lee J.Wang
Dept of Civil Engineering, the University of Hong Kong, Hong Kong Beijing Research Institute of Uranium Geology, Beijing 100029, P.R.China
国际会议
南京
英文
506-513
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）