# Study on Asymmetric Support of Anchor Cable with C-Shaped Tube in Inclined Coal Seam Roadway
## 5 Support Effect of Different Support Schemes
### Comparison of ACC and Anchor Cable Support Effect  
The reinforcement components in Scheme 1 and Scheme 3 have the same supporting position and arrangement. The difference is that the reinforcement components in Scheme 1 are anchor cables and the _ACC_, while those in Scheme 3 replace all _ACCs_ with anchor cables. From Table 6, it can be seen that compared with the original support scheme, the maximum displacements of the roof, right side, and left side are reduced by 10%, 12.5%, and 9.2%, respectively, by using Scheme 3. Compared with Scheme 3, using Scheme 1 on the basis of the original support scheme results in the maximum displacements of the roof, right side, and left side being reduced by 4.1%, 5%, and 2.6%, respectively. It can be found that under the same supporting parameters, the _ACC_ support can effectively reduce the displacement of the roof and both sides of the roadway compared to the anchor cable support. This demonstrates that the _ACC_ support can greatly increase the shear performance of the rock, increase the support strength of the roof and both sides, and increase the stability of the roadway when compared to the anchor cable.  
From Table 6, it can be seen that the plastic zone volume is reduced by 16% by using Scheme 3 on the basis of the original support scheme. Compared with Scheme 3, using Scheme 1 on the basis of the original support scheme can reduce the plastic zone volume by 11.7%. This indicates that the _ACC_ support can effectively improve the three-dimensional stress state of the surrounding rock, enhance the overall mechanical properties of the surrounding rock, reduce the plastic failure range of the surrounding rock, and improve the stability of the roadway.  
Selecting the _ACC_ at a distance of 1.75 m from the left side of the roof in Scheme 1 and the anchor cable in Scheme 3, which are located in the same position, two reinforcement schemes were adopted, and the horizontal displacements of the _ACC_ and anchor cable are shown in Figure 18. Figure 18 provides the orientation of the coordinate system. When the model's deformation aligns with the direction of the coordinate system, the numerical value is positive. Conversely, when the model's deformation deviates from the direction of the coordinate system, the numerical value is negative. It can be seen from Figure 18 that the closer to the surface of the roadway, the greater the horizontal displacement of the _ACC_ and anchor cable. The maximum horizontal displacement of the _ACC_ is 2.66 mm, and the maximum horizontal displacement of the anchor cable is 2.81 mm. Compared with the anchor cable, the maximum horizontal displacement of the _ACC_ can be reduced by 5.3%. [PERSON] et al. [34] utilized the _ACC_ in the deep straight-wall semi-circular arch roadways of the Zhengling Mine and found through field monitoring that the roadway deformation was effectively controlled, with no shear failure observed in the _ACC_. In response to issues such as anchor cable fractures, the Nanguan Mine adopted a full-section _ACC_ support scheme. Field investigations revealed a smooth surface along the entire supporting section, and no anchor cable failure occurred within the _ACC_[35]. Combining the results of numerical simulations and field research, it can be concluded that the _ACC_ exhibits superior resistance to shear deformation compared to anchor cables, making it an effective solution for controlling roadway deformation.