## 3 Results and Discussion
### Analysis of Rock Formations in the Area of Influence
#### 3.1.1 Total Displacement Response  
The total displacement response characteristics of the cross-tunneling project were analyzed based on the vector and total displacement cloud maps of the axial profile of the new left-lane tunnel, the axial profile of the existing tunnel, and the monitoring point data. Vector versus total displacement cloud analysis  
Figure 14 shows the axial profile vector and total displacement of the new left tunnel. After the excavation and support of the new tunnel, the upper rock layer moves downward and the bottom rock layer moves upward. The displacement-affected area is divided into strong disturbance area I, medium disturbance area II, low disturbance area III, and slight disturbance area IV, which are symmetrically distributed. As the excavation progresses, the range of each influence area tends to increase. In the upper rock layer, the strong disturbance area ranges from 1 to 2 times the diameter of the hole, the medium disturbance area ranges from 0.5 to 1 times the diameter of the hole, the low disturbance area ranges from 0.8 to 3.5 times the diameter of the hole, and the micro-disturbance area has a large range. In the bottom rock layer, the strong disturbance region ranges from 1 to 1.5 times the hole diameter, the medium disturbance region ranges from 0.5 times the hole diameter, the low disturbance region ranges from 0.5 to 2 times the hole diameter, and the micro-disturbance region ranges from 2 to 4 times the hole diameter. Figure 15 shows the axial profile vector and total displacement cloud diagram of the existing tunnel. After the excavation and support of the new tunnel, the tunnel vault sinks, the floor slab bulges, and the side walls move outward. The displacement areas of the upper and lower rock layers of the new tunnel include the following four areas: strong disturbance area I, medium disturbance area II, low disturbance area III, and micro-disturbance area IV, while the displacement areas of the rock layers of the sidewalls are mainly in the low-disturbance area III and micro-disturbance area IV. Figure 13: Tunnel excavation data extraction time step diagram. area expanding in concert; the middle area of the tunnel exists in the micro-disturbance and undisturbed areas. (2) Analysis of monitoring point data  
Five typical profiles are selected at an interval of 17.85 m in the Y-axis direction of the cross-tunneling project, four 24 m-long survey lines are arranged in each profile, and five survey points at an interval of 6 m are arranged on each survey line, as shown in Figure 16.  
Figure 17 shows the existing tunnel's profile measurement point excavation data extraction time step and the total displacement change curve, which is analyzed using the different profile measurement point displacement evolution law obtain the displacement characteristics of the measurement point. Figure 15: Vector and total displacement maps of the axial section of the existing tunnel. Vaulting points: The tunnel structure points in the middle profile of the left and right tunnels (MS3) were affected by the two tunnel excavations and had the largest total displacement, followed by the left and right tunnel profiles (MS2 and MS4) with comparable displacement values, and, finally, by the MS1 and MS5 tunnel structure points, with the MS5 tunnel structure point having a larger displacement than that of the MS1 point. With the excavation time step (S1 and S2), MS1 and MS2 profile points are the first to produce a displacement disturbance, due to the new tunnel and the existing tunnel at a diagonal angle. The left line intersection with the latter time step (S3 and S4) displacement growth slope is the largest, ranging from the tunnel structure measuring point to a point away from the gradually decreasing tunnel body measuring point displacement value, with the difference between the measuring points demonstrating a trend of growth; the S5-S7 excavation process of the displacement value of the measuring points demonstrates a trend of growth; however, the slope tends to decrease.