关键词: 高边坡, 振动台试验, BFRP锚索, 加速度, 位移谱

Abstract: In general, the steel anchor cable can effectively reduce the deformation of the slope body, and is useful for slope reinforcement when the seismic intensity is low. However, the anchored rock mass deforms excessively under strong earthquake conditions, and conventional prestressed anchor cable cannot sustain the large deformation, which leads to the catastrophic slope instability and failure. Additionally, the corrosion of steel anchor cable often occurs under the groundwater containing corrosive substances. In view of this, the dynamic response of the slope reinforced using the new basalt fiber reinforced plastics (BFRP) and the unsupported slope was compared through the large-scale shaking table tests, aiming to provide a scientific basis for the dynamic rational design of BFRP anchor cables for reinforcement of high slopes. The result shows that: compared with the slope supported by BFRP, the unsupported slope has obvious deformation stages during seismic loading, which can be divided into elastic stage, plastic stage, plastic reinforcement stage, and failure stage. When the peak value of input wave is less than 0.2g, both the slope supported by BFRP anchor cable and the unsupported slope are in elastic state. In addition, the peak acceleration value of the slope supported by BFRP anchor cable is greater than that of the unsupported slope, which indicates that the BFRP anchor cable can effectively improve the rigidity of the slope. Under the action of seismic wave in the same condition, the displacement spectrum value of each measured point in the unsupported slope is greater than that of the corresponding measured point in the slope supported by BFRP anchor cable, which indicates that the BFRP anchor cable can reduce the deformation and improve the seismic performance of the slope in the slope supporting engineering.

Key words: high slope, shaking table test, BFRP anchor cable, acceleration, displacement spectrum