Stress response characteristics of BFRP anchors on loess mudstone slope under rainfall conditions

To investigate the stress response characteristics and shear stress transfer mechanism of BFRP (basalt fiber reinforced plastics) anchors under rainfall conditions and to explore the reinforcement effect of BFRP anchors, a comparative indoor physical model test was conducted in this study using loess mudstone slope as a typical case, and multi-attribute response data, such as slope displacement, BFRP anchor strain and axial force, were obtained. Based on the variation law of slope displacement, it can be concluded that the deformation displacement of the slope on the side reinforced by BFRP anchors is smaller than that of slopes reinforced with steel anchors; the bearing capacity of BFRP anchor is given priority in time, and the anchoring effect of BFRP anchor at the top of the slope is given priority, and the axial force value of anchor is characterized by a surface amplification effect in space; the axial force is higher around the anchor head and tends to decay as a negative exponential function as the anchor extends in the direction of the interior of the slope; the shear stress of BFRP anchor and anchorage body are unevenly distributed along the axial direction, with the maximum value occurring in the free section near the slope surface and decreases as the BFRP anchor extends towards the interior of the slope. These results can provide a theoretical basis for the optimal design of BFRP anchors.