## 3 Results and Discussion
### Analysis of Rock Formations in the Area of Influence
#### 3.1.1 Total Displacement Response
After the excavation of S7 and S8, the slope of the displacement growth of the D1-D4 measuring points tends to stabilize and the displacement difference between the measuring points does not change much; the displacement value gradually decreases from the measuring point of the tunnel structure to the measuring point far away from the cave body, and the displacement values of the D1 and D2 measuring points are similar. The displacement difference between the measuring points in the left excavation process (S1-S6) is not obvious, and the displacement value from the tunnel structure measuring point to the measuring point away from the hole body is gradually decreasing; the displacement value of each measuring point is similar after the excavation value intersection, the slope of the displacement growth of each measuring point tends to be stable after that, the difference in the displacement value of each measuring point does not change much, and the displacement value of each measuring point gradually increases from the measuring point of the tunnel structure to the measuring point away from the hole body. After S7 excavation and support, the displacement of each measuring point is obviously disturbed and the displacement value of the tunnel structure measuring point becomes the minimum value; after S7 excavation and support, the displacement growth slope of each measuring point is the largest and the displacement values of D1-D4 are similar; after that (S8-S10), the displacement of the tunnel structure measuring point tends to be stabilized and the slope of the displacement growth rate of the D1-D4 measuring points decreases. Left side wall measurement point: The slope of the MS1 profile measurement point in the S2-S3 excavation support after displacement growth is high and the displacement value gradually increased from the tunnel structure measurement point to the point away from the hole body measurement; after (S4-S10), the displacement growth slope gradually reduced, the L1-L4 measurement point displacement values are similar and at a greater value than the L5 displacement value. The slope of the MS2 profile measurement point in the S2-S4 excavation support after displacement growth is high and the displacement value gradually increased from the tunnel structure measurement point to the point away from the hole body measurement; after (S5-S10), the displacement growth slope gradually reduced and, after, the tunnel through the displacement value of each measurement point does not have much difference. The slope of the MS3 profile measurement point in the the S2-S6 excavation support after displacement growth is high and there are not many changes, with the difference in the displacement value of the measurement point being stable; then (S7-S10), the displacement value is similar and greater than the L5 displacement value. The slope of displacement growth in S2-S6 is high and few changes are observed, with the displacement difference between each point being stable; after that (S7-S10), the slope of displacement growth decreases gradually and the displacement difference between each point does not show much difference after tunnel penetration; the slope of displacement growth in S2-S6 shows an increase and the displacement difference between each point is also increasing; after that (S7-S10), the slope of displacement growth decreases gradually and the displacement difference between each point does not show much difference in S2-S7 and S7, and the displacement difference between each point does not show much difference. After the excavation and support of S7, the slope of displacement growth shows an increase and the difference in displacement between the measuring points gradually increases; after that (S8-S10), the slope of displacement growth gradually decreases and there is not much difference in the displacement values of the measuring points after the tunnel has passed through.