| dc.description.abstract | This research performed a series of frictional tests of sandstone specimens. In these tests, various frictional stresses were applied to study the required time for creep failure, and measuring sound wave and vibration wave signals to distinguish creep deformation and failure. According to the experimental results, for a post-yielding stress closer to the failure frictional strength, the creep failure time will be shorter. And for a post-yielding stress closer to the yielding stress, the creep will last for a very long period or it may not fail. These experimental results indicate that applying a stress after yielding will accelerate sliding deformation of sandstone and causes failure. Besides, when applying a post-yielding stress which is less than 50% of the range between yielding and failure, sandstone specimen will be under a safe state. However, if the post-yielding stress is larger than 50%, the failure of sandstone specimen will happen rapidly. When friction stress is more than 50% of post-yielding stress, the failure time is ranged between 0 and 36 seconds. However, failure will last more than two days for the post-yielding stress less than 50%. With the assistance of sound and acceleration signals, the combination of these information measured from rock slope may be used as a tool of early warning. | en_US |