ANALYSIS OF ENERGY CHARACTERISTICS AND DEFORMATION PARAMETERS OF ROCK MASS UNDER CYCLIC LOADING
(1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education，China Three Gorges University，Yichang，Hubei 443002，China；2. HydroChina Guiyang Engineering Corporation，Guiyang，Guizhou 550002，China)
Abstract：Using RMT–150C rock mechanics test system，experimental tests of different kinds of rock materials under cyclic loading with the test condition of different stress levels and loading rates are carried out. Based on the division of stress and strain curves under loading and unloading conditions，the energy dissipation rate during unloading process is defined；and energy conversion during rock damage process is explored. Meanwhile，change laws of the deformation parameters such as the elastic modulus，Poisson¢s ratio and residual strain are also analyzed quantitatively. The research results indicate that the higher the stress level and loading frequency are，the stronger the lithology is，the greater the hysteresis loop area，doing work the process of loading and the release elastic energy during the unloading process are；besides，the rock is softer，the energy conversion rate is higher. Before rock mass does not reach the peak value of compressive strength，the higher the stress level is，the greater the elastic modulus is，which shows that within the range of the rock mass compressive strength，with the higher loads，the deformation ability of rock mass under the same load increment weakens significantly when the gap and micro defect are compacted. Meanwhile，it can be given that fatigue strength will reduce when the frequency increases to a certain level. As a whole，the axial and lateral relative residual strains of rock decrease gradually with the increase in cycle numbers.
刘 杰1，李建林1，张玉灯2，朱 婷1，杨姗姗1，李映霞1. 循环载荷下岩体能量特征及变形参数分析[J]. 岩石力学与工程学报, 2010, 29(S2): 3505-3513.
LIU Jie1，LI Jianlin1，ZHANG Yudeng2，ZHU Ting1，YANG Shanshan1，LI Yingxia1. ANALYSIS OF ENERGY CHARACTERISTICS AND DEFORMATION PARAMETERS OF ROCK MASS UNDER CYCLIC LOADING. , 2010, 29(S2): 3505-3513.
2010, Vol. 29 
