Numeral analysis of anchoring parameters for bolt in rock slope anchored interface shear action under earthquake

Based on FLAC3D ,building an anchored rock slope numerical model. The shear interaction on cable-grout interface and grout-rock interface were simulated separately by modified cable element, to study the regularities of wholly grouted anchor bar anchored interface shear stress in anchored slope and slope dynamic response under differ- ent support parameters ( anchorage angle,anchoring section length,bolt spacing,diameter of anchor bar and anchor drill hole). The results of the study include the following:With the increase of anchorage angle,the anchored interface peak shear stress value decreases while the permanent displacement of slope increase. The effect of interface anchoring was optimized with the same length of bolt between both side of structural surface. With the decrease of bolt vertical spacing,the peak shear stress value and peak displacement decrease,and they decrease with the addition of diameter of anchor bar and anchor drill hole. On the premise of safety and economy,the authors suggest to decrease anchorage angle and bolt vertical spacing properly,keep the same length between drawing section and anchoring section of bolt,maintain a proper ratio between the diameter of anchor bar and anchor drill hole. The study can provide references for theoretical and experimental study on relevant aspects,and earthquake resistant design of anchored slope.