Dynamic slope effect of BFRP anchorage structure under earthquake

The reinforced rock and soil is the main research object of dynamic fixing slope effect of anchoring structure under earthquake condition. The dynamic effects of anchoring structures reinforced slope is the research focus and development trend of rock and soil anchoring engineering. Based on the shaking table model test comparison of BFRP (basalt fiber reinforced polymer) anchor frame reinforcement slope and unreinforced slope, the dynamic response of the acceleration amplification factor of typical slope under different seismic loading conditions of Ludian is quantitatively analyzed. The results show that 1) with the increase of the input seismic wave acceleration peak value, the local damage of the slope is beneficial to the amplification of the vertical component of the seismic wave at this location. It is exactly the opposite of the amplification effect of the horizontal component of the seismic wave at the same location, and it can be used to identify the local damage in rock and soil of the slope; 2) According to the physical meaning of the acceleration peak ratio (Ki)-height curve, the BFRP anchorage structure reinforced slope will be affected by large dynamic shear stress when the input seismic wave acceleration peak is greater than or equal to 0.4g. The effect of dynamic shear stress mainly occurs in the middle and lower part of the slope, which is significantly different from the unreinforced slope; 3) By analyzing the macroscopic experimental phenomena during the model test, it is revealed that the damage of the unreinforced slope mainly occurs at the top of the slope and the position of the free surface. The development of deformation and destruction process are as follows: tensile cracks appear at the top of the slope and shear cracks appear on the surface→crack extension→slope subsidence and collapse at crack intersection place→shallow surface layer damage from top to bottom. The BFRP anchor cable frame reinforcement slope produces only the shear cracks at the local position of the slope, and the integrity is better. The results show that the BFRP anchor frame can effectively adapt to the deformation of the slope and reduce the damage caused by the dynamic response of the slope at different heights, presenting a good seismic performance. © 2020, Science Press. All right reserved.