## 4 Results and Discussion
### Analysis of the Impacts of Abandoned Dregs on the Bridge Project in the Abandoned Dreg Site
#### 4.2.2 Impact Analysis of Different Working Conditions  
(1) Under normal conditions  
The mechanical parameters of the model are taken from the normal working condition parameters in Table 1. The lateral displacement cloud and bending moment distribution of the pile obtained from the calculation in the case of no load at the top of the pile are shown in Figures 13 and 14.  
Figure 12: Lateral displacement of pile top and maximum bending moment of pile body under different vertical force intensities. (**a**) Lateral displacement of pile tops. (**b**) Maximum bending moment of pile.  
From Figure 13, it can be seen that the lateral displacement along the pile body from bottom to top decreases at first and then increases in the reverse direction. The maximum lateral displacement of the pile body is 11.13 cm, which occurred in the lowest part. The lateral displacement at the top is in the negative x-axis direction, which is 2.17 cm. It can be seen from Figure 14 that the distribution of the pile bending moment presents an inverse \"S\" shape. With the increase in pile height, the bending moment first increases to the first peak value of \(-\)261.37 kN\(\cdot\)m. It then decreases to 0 and then increases reversely to a second, larger peak of 416.54 kN\(\cdot\)m, and finally decreases continuously to 0.  
(2) Under storm conditions  
The mechanical parameters of the model are taken from the storm condition parameters in Table 1. The distribution of pile bending moments in the lateral displacement cloud of the pile calculated under storm conditions is shown in Figures 15 and 16.  
Figure 14: Bending moment of pile in normal condition.  
Figure 13: Cloud diagram of lateral displacement of pile in normal condition.  
From Figure 15, it can be seen that the pile body is still tilted to the left in the storm condition, and the lateral displacement along the pile body from bottom to top decreases continuously to 0 and then increases in the reverse direction. The maximum displacement is 15.64 cm at the bottom of the pile, which is 40.52% higher than the maximum lateral displacement at the bottom of the pile under the normal condition. The lateral displacement at the top of the pile in the negative direction of the x-axis is 3.91 cm, which is 80.18% more than in the normal condition. From Figure 16, it can be seen that the bending moment of the pile body shows a trend of increasing and then decreasing with the increase in pile height. The peak value is 643.85 kN-m, which is 54.57% higher than the peak positive bending moment in the normal condition.  
Hazard Prevention and Control Techniques for Bridge Engineering in Cases of Slipping of Abandoned Dreg Body  
By comparing the normal condition and the storm condition, it can be seen that the maximum bending moment of the pile body increases significantly when the working condition becomes unfavorable. And the compressive strength of reinforced concrete is stronger and the tensile strength is weaker [33]. The tensile strength is about 1/10 to 1/8 of the compressive strength. Therefore, in order to prevent the bridge pile damage caused by the sliding of the abandoned dregs under more unfavorable conditions, it is necessary to strengthen the slope by adopting hazard prevention and control techniques.  
Figure 16: Bending moment of pile in storm condition.  
Figure 15: Cloud diagram of lateral displacement of pile in storm condition.