## 3 Experimental Results
### Slope and Overburden Stress Analysis  
Soil pressure monitoring can help comprehensively characterize and reveal the plastic zone and fracture mechanisms of the slope soil body during stress changes. Based on the range of soil pressure sensors arranged in the slope and covering layer (from T3 and T8 on the left, to the toe of the slope on the right), representative analysis was conducted on the data obtained from one displacement in each of the three stages. The stress change cloud maps during soil fracture in the two experiments were drawn using the contour map of  
Figure 9: MRZ width and depth trend diagram of bedrock dislocation: Changes in the width and depth of the MRZ during soil body rupture (**a**) at the slope crest (T1) and (**b**) at the slope toe (T2).  
Origin2024 software, as shown in Figures 10 and 11. The range of significant soil pressure changes in the figures roughly represents the plastic zone.  
As shown in Figures 10 and 11, the local soil stress concentration caused by changes in the soil pressure contributes to the further development of the MRZ by accumulating plastic or stress boundary zones. In the crack damage stage (Stage I, 10 mm), both the tests showed distinct plastic zones in the overlying soil near the bedrock dislocation point, a plastic zone also developed within the slope, corresponding to the crack development observed at the site. However, the plastic zone range in the slope crest soil fracture test was wider, and the damage was more significant, with the maximum soil pressure change reaching \(-11\) kPa. In the expansion and penetration stage (Stage II, 50 mm), the plastic zone of the overlying soil in the slope crest soil fracture test still changed, indicating the transition of the crack into a rupture zone. Indicating the expansion and widening of MRZ-S1. The plastic zone within the slope body continued to change, and the interaction between MRZ-S2 and MRZ-S1 caused the main rupture zone to penetrate the soil body, which is roughly consistent with the location of the main rupture zone. The changes in the slope toe soil fracture test were not as significant as those in the slope crest test. The location of the rupture zone dislocation at the slope toe has changed. In the failure and stabilization Stage (Stage III, 80 mm), the plastic zone of the overlying soil in the slope crest soil fracture test continued to change, indicating that MRZ-S1 was expanding and widening and that it continued to extend upward, while there was no change in the slope toe soil fracture test, nor within the slope body. The final rupture area is consistent with the location of the main rupture during the experiment.  
Figure 11: Stress variation cloud diagram during soil body rupture at the slope toe (T2) under different loading: (**a**) 10 mm, (**b**) 50 mm, and (**c**) 80 mm.  
Figure 10: Stress variation cloud diagram during soil body rupture at the slope crest (T1) under different dislocation: (**a**) 10 mm, (**b**) 50 mm, and (**c**) 80 mm.  
From the above, it can be seen that the damage was more severe in the slope crest soil fracture test. Moreover, a stress analysis of the slope body and its overburden layer reflected the macroscopic rupture development characteristics of the MRZ.