Abstract: The deformation， damage and energy consumption were investigated based on the experiment of watersaturated diorite samples from Zhongguan iron mine， under the uniaxial cyclic loading and unloading. The results show that the stressstrain curves display internally sunken at each loading and unloading cycle. With the increasing of the cycle times and the stress level， the plastic hysteresis curve moves towards the larger and the nonrecoverable deformation declines. The absolute and total damage parameters of the axial， lateral and volumetric strains increase with the stress. Moreover， a same trend is found for the three parameters. The value of energy dissipation shows approximately liner relationship with the cycle times， and the later energy dissipation is not equal to the sum of previous energy dissipations.

Key words: uniaxial compression, cyclic loading and unloading, saturated rock, damage, energy dissipation