## 2 Test Design and Result Analysis
### Analysis of Monitoring Results
#### 2.3.2 Deformation of the Main Body and Subsidiary Structure of the Station
To study the horizontal deformation law of the main structure of the station during foundation pit construction, the time-history data of the horizontal displacement monitoring points CZH-2, CZH-5 and CZH-8 of the main structure of the station are selected for analysis, as shown in Figure 10. The horizontal displacement of the main structure of the station shifts to the inside of the foundation pit at all stages of excavation and gradually increases. The maximum horizontal displacement deformation of the main structure of the station is 1.7 mm. Compared with the vertical displacement, the maximum horizontal displacement of the main structure of the station is 1.3 times its maximum vertical displacement. In the construction of foundation pit excavation, the horizontal displacement of the station is more sensitive than its vertical displacement. The foundation pit retaining pile plays a great role in the deformation isolation of the station. In the construction, the measurement frequency of the horizontal displacement of the station should be strengthened. (2) Structural deformation of the entrance and exit  
To obtain the vertical deformation law of the entrance and exit structure in the foundation pit construction process, the time-history data of the vertical monitoring points C-4, C-5, C-8 and C-9 at the entrance and exit are selected for analysis, as shown in Figure 11. The vertical displacement of the entrance and exit structures has a slight downward trend in the construction stage of the foundation pit retaining structure. In the excavation stage of the foundation pit, the phenomenon of subsidence and then floating is presented, which is opposite to the deformation of the main structure of the station. The main reason is that the entrance and exit structure is close to the foundation pit and is in the position of the surface settlement trough. In the process of excavation and unloading of the foundation pit, the soil near the foundation pit is squeezed to produce downward displacement, which drives the entrance and exit structure to move downward. The cumulative deformation value of the vertical displacement of the entrance and exit in the excavation stage is 1.7 mm. In the stage of floor pouring and structure construction, the structural deformation of the entrance and exit has an obvious downward trend, and the maximum displacement reaches 2.9 mm. More attention should be given to the monitoring and measurement of the vertical deformation of the entrance and exit in the construction process. Figure 10: Time\(-\)history curve of the horizontal displacement of the station structure. The measured data of CH-1, CH-2, CH-3 and CH-4 at the horizontal deformation monitoring points at the entrance and exit are selected for analysis, as shown in Figure 12. The horizontal displacement deformation trend of the entrance and exit gradually increases, which is consistent with the horizontal displacement deformation trend of the station, but the growth rate is more obvious than that of the station. The maximum horizontal displacement is 2.8 mm, which is 1.7 times the maximum horizontal displacement of the station. The horizontal displacement trend of each measuring point is biased toward the inside of the foundation pit.