The uniaxial compression constant amplitude fatigue test was adopted to make cyclic loading tests for pre-fractured 30°, 45°, 60° and 90° rock-like model specimens and the corresponding anchored model specimens. It was indicated that the processes of fatigue damage of fractured rock-like specimens can be divided into three stages: fatigue crack initiation stage, fatigue crack propagation stage and fatigue crack rapid propagation stage. Compared with non-anchored model specimen, the plasticity of anchored model specimen was significantly enhanced, and anchored model specimen can bear greater axial strain. The anti-pulling force test analysis was made for the fatigue damage process of anchored model specimen in three stages. During the first and second stages of fatigue damage process, the anchorage body was relaxed, but the integrity of model specimen was intact; in the anterior 80% life cycle of model specimen, the anti-pulling force of anchor was decreased by 20%.
At present, the high-speed railways, highways and other infrastructure constructions in China keep vigorous development and continue to extend to the mountainous areas, whereas the problems in steep and complex rock slope projects are increasingly prominent. These rock slopes along with highways and railways are not only located in the formidable geological environment, but also affected by the long-term impact of cyclic loading of highways and railways. As people start to learn the impact of cyclic loading and attach importance to the security of long-term slope engineering, the research on fatigue degradation for the rocks under the impact of cyclic loading has been one of the hot topics among the researchers in rock mechanics at home and abroad (Ge Xiu-run et al. 2003, Jiang Yu et al. 2004, XU Jian-guang et al. 2008, Wang Guo-yan et al. 2009, M.K. Jafari et al. 2003, S Demirdag et al. 2010, Peckley D C et al. 2009 & Bagde M N et al. 2005).
Joint is the most common weak structural plane in rock slope, but the distribution and strength of joints greatly affect the stability of the rock slope. Anchor is a common approach to reinforce the jointed rock slope, and anchor plays an important role in the crack propagation and deformation of jointed rock. Thus, researches for the effects of anchor on jointed rock will provide meaningful insights for the security, rationality and economy of slope engineering designs. Now, the researches of jointed rock mass and its anchoring effects are mainly focused on the conditions under static loading (Qu Tao et al. 2011 & Yi Yong-liang et al. 2010), but the micromechanical deformation characteristics, process of fracture, fatigue mechanism and its influencing factors, as well as fatigue test of anchored jointed rock under cyclic loading, frequency response of the slope under train load, anti-fatigue design parameters of slope are rarely involved.
