Experimental Study On Bearing Capacity And Stability Of Reinforced Slope Penetrated With Pile

Because the reinforced slope penetrated with pile is a new structure,the mechanism of this structure is complicated,and there are few studies on it.Therefore,the bearing capacity and stability of reinforced slope penetrated with pile was studied through model tests in this paper,and the changes of Q-S curve,axial force of pile,tip resistance of pile,lateral displacement,bending moment of pile and vertical earth pressure under vertical load were analyzed.At the same time,the influence parameters of the bearing capacity and stability of reinforced slope penetrated with pile were investigated such as structure type(pile,pile cap,reinforcement material),number of reinforced layers,reinforcement spacing,pile diameter,pile length,slope rate,slope distance,stiffness of reinforcement material,etc.The following main conclusions are obtained:(1)The structure of reinforced slope penetrated with pile can significantly improve the bearing capacity and effectively control the settlement through the synergistic effects of the vertical pile,pile cap and horizontal reinforcement material,can better adjust the load transfer mode to make the shaft resistance and tip resistance of pile share load more reasonable,can enhance the ability to limit the lateral displacement,can make the bending moment distribution of pile more reasonable,and can improve the distribution of vertical earth pressure.Therefore,the structure superiority of reinforced slope penetrated with pile is verified in this paper.(2)Through the analysis of Q-S curve,axial force and tip resistance of pile under vertical load,the bearing capacity influence parameters of reinforced slope penetrated with pile were investigated such as number of reinforced layers,pile length,slope distance,pile diameter,etc.It shows that with the increase of number of reinforced layers,pile length and slope distance,the ultimate bearing capacity increases,and the vertical settlement decreases.With the increase of pile length,slope distance and pile diameter,the axial force in the range of pile top and bottom decreases more along the depth direction of pile,and the tip resistance increase of pile is not obvious.(3)Through the analysis of lateral displacement,bending moment of pile and vertical earth pressure under vertical load,the stability influence parameters of reinforced slope penetrated with pile were investigated such as pile length,number of reinforced layers,reinforced spacing,slope rate,stiffness of reinforcement material,pile diameter,etc.It shows that within a certain range,increasing the pile length and number of reinforced layers,pile has an enhanced effect of restricting the middle and bottom lateral displacement of reinforced slope penetrated with pile,which can decrease the bending moment extreme value of pile,make the bending moment distribution of pile be more reasonable.There is an appropriate reinforcement spacing,so that the lateral restraint of reinforcement material in soil can be maximized.With the increase of the stiffness and number of layers of horizontal reinforcement,the earth pressure at the upper and middle parts under the pile cap is decreased compared with that between the pile cap.At the same time,within a certain range,the slope rate is decreased,which can decrease the bending moment extreme value of pile,make the bending moment distribution of pile be more reasonable and avoid the local stress concentration of the pile.However,when the slope rate is too small,the absolute amplitude of bending moment increases.In addition,increasing the pile diameter can obviously decrease the vertical earth pressure under and between the pile caps.The conclusion of this thesis can provide a theoretical and design basis for the application of reinforced slope penetrated with pile.