Citation

Peng N, Yan Z. Disaster Adv. 2013; 6(2): 4-11.

Copyright

(Copyright © 2013, Shankar Gargh)

DOI

unavailable

PMID

unavailable

Abstract

In this study, FLAC3D is applied to stimulate the dynamic responses of anchored and unanchored rock slope under earthquake. The horizontal displacements of the surface, top and inside of slope at different elevations, axial force of rock bolt and interaction between rock bolt and the surrounding rocks are presented and discussed. The average tensile strain and nominal shear strain are defined and employed acting as the criteria for slope failure and reinforcement effects of rock bolt. The results show that rock bolt can reduce shear strain effectively of lower slope and decrease the tensile strain of upper slope. The Fourier analysis is used for further study of dynamic characteristics of slope. The acceleration Fourier spectrum displays that the acceleration amplitude increases as the elevation rises. What is noticeable is that it is at slope shoulder that strong vibration of single frequency occurs. Comparative study shows the effect of strengthening rock mass using rock bolt resembles that of increasing elastic modulus and reducing Poisson's ratio of rock mass. The results show that rock bolt can significantly improve the anti-seismic capacity of anchored slope.