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对花岗岩样品进行逐次加载的蠕变实验,得到了加载过程中的蠕变曲线和蠕变破裂的全过程曲线.对加载过程中的杨氏模量、蠕变量、蠕变速率等参数用加卸载响应比方法进行了分析,认为有二种不同形态的响应曲线.在中低应力的弹性阶段其响应比都近似为1,而在高应力的膨胀阶段其响应比都随应力而增加.对应力不变时的蠕变破裂全过程曲线进行了分解,在蠕变破裂过程中,瞬态、稳态和加速3个阶段的持续时间分别为全部时间的18%,75%和7%;在加速蠕变阶段蠕变速率及其响应比明显增加.这一结果是预测蠕变破裂的明显指标.
The creep experiment of granite sample was carried out one by one, and the whole curve of creep curve and creep rupture during loading process was obtained.The parameters of Young’s modulus, creep amount and creep rate during loading Unloading response ratio method was analyzed, that there are two different forms of response curve in the low-stress elastic phase of the response ratio are similar to 1, and in the high-stress expansion phase response rate increases with the stress corresponding The whole curve of creep rupture under constant force is decomposed. The durations of transient, steady state and acceleration in creep rupture are 18%, 75% and 7% of the total time in creep rupture. The creep rate and its response ratio increase significantly during the accelerated creep phase, a result that is a clear indicator of creep rupture.