Numerical Analysis Of Anchorage Interface Shear Stress For Bedding Rock Slope Under Earthquake

Landslides occur frequently in China, and landslide hazards induced by earthquake are particularly severe. Anchors support can improve the anti-seismic capacity of the slope effectively.However, existing researches cannot abundantly account for the dynamic failure mechanism of slope, and researches on shear stress along cable/mortar interface and mortar/rock interface under earthquake are extremely rare. Taking bedding rock slopes as research objects, the shear stress distribution rule of two anchorage interfaces supported by fully grouted anchor and the interface failure mechanism can be obtained by numerical simulation research with the application of finite difference software FLAC3 D. The main results and conclusions are summarized as follows:(1) Stress analysis of rock units under earthquake shows that tensile failure mostly appear at the top of slope, while shear failure frequently occur at the toe of slope. Load transfer approach of anchorage system under earthquake is: Unstable rockâ†'Shallow mortarâ†'Body of anchorâ†'Deep mortarâ†'Bedrock.(2) Numerical simulation researches on the failure mechanism of anchorage interface under earthquake show that the interface shear stress in rock mass with poor lithology reaches the limit value firstly and then the interface occur debonding. As the earthquake continues, the interface in rock mass with good lithology occur debonding either. Meanwhile, the shear stress peaks of anchorage interface transfer to the head and the root of the anchors, respectively.(3) In order to learn the influence of different seismic parameters and anchoring modes on the shear stress along cable/mortar interface and mortar/rock interface, the research varied the duration, amplitude, frequency of earthquake and the length, install angle of anchors. And the results show that the distribution form of the anchorage interface shear stress along the anchor length displays bimodal. In addition, the varies of the factors above do not change the distribution form of interface shear stress, but change the value obviously.The research has been done has a guiding significance for the future experimental research,and the results of this paper contribute to the design of anchorage rock slope scientifically.