# Study on Asymmetric Support of Anchor Cable with C-Shaped Tube in Inclined Coal Seam Roadway
## 6 Conclusions  
This paper first compares the shear performance of an \(ACC\) with that of an anchor cable through a double shear test. Then, aiming at the roadway's asymmetrical deformation features in the Pangpangta inclined coal seam, according to its asymmetrical deformation law and combined with the high shear performance of the \(ACC\), the asymmetrical support reinforcement scheme of the \(ACC\) is proposed. The numerical simulation test was conducted using FLAC 3D, and the following key findings were made:  
(1) We derived the shear strength calculation formula for the \(ACC\) anchorage joint surfaces through theoretical analysis. There are three stages to the shear load-shear displacement curve of the \(ACC\): rapid rising, slow rising, and stepped falling. The gentle stage, ascending stage, and stepped-falling stage of the axial force-shear displacement curve of the \(ACC\) can be separated. The stages divided by the shear load/axial force-shear displacement curve of the anchor cable are consistent with those of the \(ACC\). Compared to the anchor cable, the \(ACC\) has a much better shear capability. The peak shear capacity of the \(ACC\) is 19.4% greater than that of the anchor cable at the same degree of prestress.  
(2) Due to the influence of the dip angle, the stress of the surrounding rock on both sides of the inclined coal seam is asymmetric at the same depth, and the side with higher stress undergoes greater deformation after the excavation of the roadway, resulting in an asymmetric deformation of the sides. Symmetrical support exacerbates the asymmetric deformation characteristics of the inclined coal seam roadway on both sides. Compared with symmetrical support, asymmetrical support can not only effectively reduce the deformation and plastic failure zone of the roadway, but also significantly reduce the asymmetry of both sides, alleviate the asymmetric characteristics of both sides, and have a better supporting effect.  
(3) Under the same support mode, compared with the anchor cable support, the roadway deformation and plastic zone volume are smaller when the \(ACC\) support is adopted. Shear resistance is higher in the \(ACC\) than in the anchor cable. The \(ACC\) support can enhance the shear performance of the surrounding rock, enhance the support strength of the roof and two sides, reduce the plastic zone, and enhance the ability of the coal seam to support itself.  
Formal analysis, R.S.; writing--original draft preparation, TL.; writing--review and editing, W.L., Y.C., S.S., G.L. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the National Natural Science Foundation of China-Research, grant number 52274148.  
Not applicable.  
Figure 18: Lateral displacement of \(ACC\) in Scheme 1 and anchor cable in Scheme 3: (**a**) \(ACC\) in Scheme 1; (**b**) anchor cable in Scheme 3.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** Not applicable.  
**Acknowledgments:** The National Natural Science Foundation of China provided financial assistance for the study that is the subject of this paper.  
**Conflicts of Interest:** The authors declare no conflict of interest.