## 5 Industrial-Scale Test
### Manifestation Law of Mine Pressure  
To comprehensively assess the effectiveness of the experimental scheme in controlling the stability of the surrounding rock, this study monitored a 200 m section of the 7264 ventilation roadway, with monitoring stations placed every 50 m. The monitoring included data from five measurement points, covering the surrounding rock deformation, anchor rod (cable) stress, and roof delamination, among other parameters (Figure 24). An in-depth analysis of the interrelationships between these data was conducted, and the results are presented in Figure 25.  
When the surrounding rock deformation increases, it is typically accompanied by an increase in the surrounding rock stress, which in turn leads to higher anchor (cable) loads. In the monitoring data from the 7264 ventilation roadway, following optimization of the support scheme, the surrounding rock deformation significantly decreased. Specifically, the maximum relative displacement between the two sides decreased from 59-30 mm, and the relative displacements of the roof and floor were reduced by 50%. This change indicated that the surrounding rock stress was effectively controlled, thereby alleviating the pressure on the anchor (cable) and enhancing the stability of the support system. The optimized support scheme ensured that the readings from the anchor (cable) load cells remained within a relatively stable range. For example, at Measurement Station II, when the roadway reached 30 m, the anchor (cable) load remained stable, indicating that the support system effectively adapted to the variations in the surrounding rock stress, thereby preventing excessive stress concentration. This further demonstrates that the reduction in the surrounding rock deformation directly alleviates the pressure on the anchor (cable). The variation in the roof delamination reflects the distribution of the roof stress, particularly the interaction between the tensile and compressive stress zones. In the monitoring data from the 7264 ventilation roadway, the roof delamination values exhibited corresponding trends as the surrounding rock deformation and anchor (cable) stress changed. The data indicated that after optimizing the support scheme, the roof delamination values significantly decreased, and the delamination changes became more stable. This suggests that the support system effectively controlled the roof stress distribution, preventing the excessive expansion of the tensile stress zone. For instance, the monitoring results from  
Figure 24: Sensor arrangement. Delamination Instrument I showed significant changes in the roof delamination along the roadway, especially within the 10-25 m range, where the delamination changes at the four measurement points were 13, 11, 3, and 2 mm, respectively. As the roadway construction continued, the delamination gradually stabilized, indicating that the roof stress state approached equilibrium. Similarly, the monitoring results from Delamination Instrument II confirmed that the optimized support scheme significantly reduced the roof delamination changes, indicating effective control over the tensile stress zone in the roof. Figure 25: Industrial-scale test results: (**a**) comparison of rock mass deformations; (**b**) comparison of bolt (cable) loading conditions; (**c**) comparison of roof separation conditions. The joint variation in the surrounding rock deformation and roof delamination provides an intuitive basis for evaluating the roadway's stability. Increased surrounding rock deformation is typically accompanied by an increase in roof delamination, reflecting the uneven roof stress caused by surrounding rock deformation, which generates larger tensile stresses. In the original support scheme, the roof delamination in the \(7_{2}64\) ventilation roadway increased rapidly during the initial phase of the roadway, particularly within the 0-30 m range, indicating excessive roof stress and poor roadway stability.