## 6 Conclusions  
In this paper, combining with a construction example of a deep foundation pit project in Wuhan City, Hubei Province, Midas GTS NX had been used to simulate and analyze the change of the bending moment and the displacement of the pile foundation near the foundation pit under the influence of different factors. Therefore, the following conclusions have been drawn from the research:  
1. As the distance from the excavation surface increases, the maximum pile moment first decreases and then increases after changing direction, and the farther the distance from the excavation surface, the smaller the rate of moment change. The closer the pile foundation is to the pit, the greater the horizontal displacement of the pile, and with the increase of the distance from the excavation surface of the pit, the horizontal displacement of the pile decreases. In addition, as the distance from the top of the pile increases, the pile displacement decreases, and the greater the distance from the top of the pile, the slower the change on pile displacement. The maximum point of bending moment near the pile foundation appears in the middle and lower parts of the pile body. When carrying out the design of construction drawings, in consideration of safety control, attention should be paid to the bending moment in the middle and lower part of the pile foundation of the adjacent building to increase the safety reserve and prevent bending damage;
2. An inclined straight combination pile support structure has an obvious pit angle effect, the bending moment and displacement of the pile foundation near the pit are also affected by the pit angle, and the closer the pile foundation is to the pit angle, the more it is affected by the excavation of the pit. Therefore, when designing a large area of deep foundation excavation, the pit angle can be pointed toward the adjacent structure for safety reasons;
3. With the increase of the tilting angle of the tilting pile support structure, the bending moment and displacement of the adjacent pile base with the same distance from the top of the pile show a trend of decreasing and then increasing, so it is appropriate to use 15\({}^{\circ}\) of tilting pile support structure in actual construction design when the bending moment and displacement of the adjacent pile base are the smallest;
4. When excavating foundation pits with a different depth-to-width ratio of inclined and straight combination piles, the pile bending moment increases and then decreases with the increase of the distance from the top of the pile. Under the same conditions, the greater the depth-to-width ratio of the pit, the greater the pile bending moment. When the depth of the pit is small, the maximum displacement of the pile body appears in the middle of the pile body, and with the increase of the excavation depth of the pit, the maximum displacement point of the pile body gradually moves down;
5. When using an inclined pile support structure, the maximum displacement of the adjacent pile foundation appears in the middle of the pile body, and the top of the pile is the minimum displacement. In the construction of safety control, attention should be paid to monitoring the displacement change of the adjacent pile foundation, and the displacement of the top of the pile should not be used as the monitoring index; and
6. The traditional static analysis only focuses on the final deformation of the structure, which cannot reflect the dangerous nodes and dangerous working conditions in the construction process, and the safety assessment made on the actual construction process is often not comprehensive. Therefore, in the design process, the whole construction process should be simulated dynamically in accordance with the actual construction plan, pointing out where the dangerous conditions are, and making a more complete safety construction plan for the project construction process. Conceptualization, H.Q., Y.Z. and M.A. ; formal analysis, M.A. and Y.Z., investigation, H.Q., M.A. and Y.Z.