沉埋桩和植物协同护坡试验研究OA

To address the engineering requirements for landslide prevention that necessitate both deep and shallow stability,and to overcome the shortcomings of current individual treatments such as driven piles and vegetation slope protection,large-scale model tests were conducted on slopes protected by driven piles,driven piles with rye grass,and driven piles with Magnolia dealbata,aiming to reveal the synergistic working mechanism of the"pile-root-soil"system under external loads and the evolution patterns of displacement and stress in different slope protection modes.The results indicate that slope deformation under the three protection modes exhibits a three-stage evolution characterized by initial stability-accelerated deformation-stable deformation;however,the pile-shrub slope protection shows the most effective deformation control,with the maximum displacement reduced by 15.8％and 9.2％compared with the embedded stabilizing pile protection and the pile-grass protection,respectively.The evolution of lateral earth pressure at the pile head and in front of and behind the pile under different protection modes exhibits pronounced stage-dependent and spatial differences;the lateral earth pressure at the pile head generally presents a four-stage evolution of initial stability-rapid increase-rapid decrease-stable maintenance,whereas the lateral earth pressure in front of and behind the pile increases first and then decreases with both time and embedment depth.The pile-shrub slope protection exhibits a stronger load-bearing capacity and a more favorable stress distribution state,with the peak lateral earth pressure at the pile head reaching 43.5 kPa,while the peak lateral earth pressures along the pile shaft are reduced by 27.4％and 8.6％compared with the embedded stabilizing pile protection and the pile-grass protection,respectively.In addition,the pile-shrub protection model shows a more pronounced optimization of pile internal forces,with the peak bending moment of the pile being 1.76 kN-m,which is reduced by 33.3％and 15.4％relative to the embedded stabilizing pile protection and the pile-grass protection,respectively.