# Study on Disturbance Mechanism of Squeezed and Non-Squeezed Soil Piles on Soft Soil Foundation
## 4 Results
### Disturbance Effects of Bored Pile  
(1) Dynamic response characteristics of the soil displacement field during the hole formation process  
Figure 22 illustrates the distribution of horizontal soil displacement in the depth direction at a horizontal distance of 10R from the center of the pile. It is observed that during the drilling process, the soil experiences a progressive increase in horizontal displacement toward the borehole with the advancement of penetration depth. Notably, the ground disturbance is maximal during this process. Furthermore, Figure 23 presents the distribution of horizontal soil displacement in the depth direction at varying horizontal distances. The disturbance in the horizontal displacement field of the soil increases with the proximity to  
Figure 21: Contour map of additional stress and displacement for the bag grouting pile. the pile. In the depth direction, the displacement curve exhibits an S-shape distribution away from the borehole. As for the vertical displacement distribution pattern, Figure 24 presents the distribution features of the vertical soil displacement in the horizontal direction at varying depths. It is found that the soil near the pile undergoes minor settlement in the vertical direction, which diminishes significantly as the distance increases. Furthermore, the shallow soil near the borehole undergoes minor relative uplift, while the deep soil experiences two prominent settlement distribution variations, one near the borehole and the other at a horizontal distance of approximately 12 m from it. Figure 23: Horizontal displacement distribution in the depth direction at different horizontal distances. Figure 22: Horizontal displacement distribution in the depth direction of at x = 10R. (2) Dynamic response characteristics of the soil stress field during the hole formation process. Figure 25 depicts the variation of horizontal stress in the soil at different horizontal distances from the pile center at half the pile length depth. At drilling depths ranging from 0 to 6 m, no significant changes in horizontal stress were observed at different horizontal distances from the pile center. However, as the drilling depth exceeded 6 m, a decrease in soil stress was evident, and the stress reduction was greater with decreasing distance between the soil and the pile. In Figure 26, the distribution characteristics of horizontal and vertical stresses in the soil after drilling are presented in the horizontal direction. Both stresses exhibit a consistent trend of increasing with the soil depth. Additionally, there is a slight variation in stress near the drill hole, and it is relatively small compared with the first two types of piles. This indicates that the bored pile induces less soil disturbance compared with the other two types of piles. Figure 24: Vertical displacement distribution in the horizontal direction at different depths. Figure 25: Horizontal stress at a depth of half the pile length varies with drilling depth. (3) Range of pile disturbance  
Figure 27 illustrates the variation of the elastic-plastic region of the pile during the drilling process, where the pile tip remains in the plastic development zone. When the drilling reaches one-third of the pile body, the superficial soil no longer undergoes plastic deformation. Figure 27: The elastic-plastic state changes during the process of bored pile drilling. In addition, this section employs 0.1 kPa and 1.0 mm to represent the additional stress and deformation characteristic values of the soil, respectively. Figure 28a presents the contour map of the horizontal additional stress of the soil when the drilling reaches the final state where the disturbance range of additional horizontal and vertical stress is 3.5 m and 13.5 m, respectively. The horizontal direction of the additional vertical stress has almost no effect (not discussed in this model). Figure 28b shows the contour map of displacement in the final state.