TESTING STUDY ON FATIGUE DEFORMATION LAW OF ROCK UNDER CYCLIC LOADING
周期荷载作用下岩石疲劳变形特性试验研究

Testing study is made on the fatigue failure and deformation mechanism of sandstone and marble under uniaxial compression condition with rock mechanics test equipment RMT-150B. Testing result shows that the fatigue failure curve is controlled by complete stress-strain curve under static loading. The terminal strain of fatigue failure is equal to that of post-peak corresponding to the maximal cyclic load. The development of irreversible deformation can be divided into three phases,that is,initial phase,uniform velocity phase and accelerated phase. The accumulative deformation at three stages will lead to the final failure. The amplitude and maximum of cyclic load are the most important effect factors on fatigue lifespan of rock.