Effect Analysis of Soft Rock Slope Reinforced by Bolts under Blasting Dynamic Load

This paper took the excavation of gravity type anchor ingot deep foundation of Nan-xi Yangtze River Bridge as the research object. A typical section of the northern slope was selected to make a 3-D numerical model. Through the equilibrium method and the numerical calculation software FLAC3D, dynamic stability of the slope, before and after being reinforced by bolts, was calculated and analyzed. Both the stress and displacement variations of the slope were compared, and the dynamic response characteristics of the slope and bolts were explored. The results show that both the maximum tensile stress and shear stress of the slope decreased, the dynamic disturbance degree of the slope inner layer mitigated observably, the latent sliding plane migrated toward the empty face, and the dynamic stability safety factor increased when the slope is supported by bolts. However, as the head of the lowest bolt located in the fine sand layer and close to the explosive source, it will shake more intensively and cause partial mortar damage, and the reinforcement effect of bolts decreased.