LARGE SCALE SHAKING TABLE MODEL TEST ON FAILURE MECHANISM OF GROUND ANCHORS USED FOR REINFORCEMENT OF STEEP SLOPE

Based on a series of large scale shaking table model test, dynamic response and failure mechanism of steep slope reinforced with ground anchors are discussed in this paper. Shaking table model test with slope height of 2.6 m revealed that the tensile force of ground anchors increased during the displacement accumulation of the slope. It was also found from the model test that the staged loss of the tensile force of the anchors, which occurred after the tensile force reached to the ultimate value, resulted into the failure of the slope. Relevant deformation analyses using the Newmark method were also carried out so as to examine the applicability of the Newmark method for the displacement evaluation of the slope reinforced with the anchors subjected to large seismic load. Evaluated displacement was much smaller than the model test result possibly because the staged increase and loss of the tensile force of the anchors were not considered in the current simulation.